GUI Extensions create a seamless experience for Tridion editors, providing shortcuts, new possibilities for bulk-editing and blueprint-aware tools that ease the task of daily content maintenance and improves the efficiency of all operations.  In this article I quickly create a new GUI Extension using the WhoDidIt example as the basis.  I also show how to convert an existing custom page, BCopy, to a new GUI Extension using the Core Service.  I hope after reading this you will be able to also convert your custom pages to GUI Extensions with little effort.

Getting Started
I use the previous GUI Extension tutorial, WhoDidIt?, as a basis for creating this new GUI Extension. There will be lots of find/replace action going on – so if this is your first time creating a GUI Extension then I strongly recommend you work your way through my previous article before continuing here. The first article explains the overall concepts and the relationships between pieces. Here I will focus on getting a GUI Extension created as soon as possible – re-using as many pieces from the GUI Extension WhoDidIt. In the first part I will walk through how to create the GUI Extension client using the previous solution of WhoDidIt as the basis on our BlueCopy extension. The second part focuses on the “Core” work – migrating the Tridion TOM API code to use the new Core Service.

What are BlueTools?
BlueTools are my Tridion Blueprint-focused tools to help you work with Tridion Blueprinted content.  This first extension in the BlueTools suite is ‘BlueCopy’, a modern interpretation on the BCopy custom ASP page. BCopy and this extension will do 1 thing and try to do it well – copy an item with its’ Blueprint children.

Downloads

WhoDidIt? GUI Extension Files– Start
BlueCopy GUI Extension Files – Solution- We create this below

Overview
Step 1: GUI Extension Client-Setup – Show a popup (~30 minutes)

Step 2:  GUI Extension Server Setup – Create the Web Service locally and call the Tridion Core Service (~15 mins)

Step 3:  Adding a new Web Service – Adding our new Service to ServiceStack (~15 mins)

Step 4:  Deploy the GUI Extension Web Service to our CMS (~20 mins)

Step 5:  Wire the GUI Extension client to the Web Service on the Server

Step 6: Converting ASP TOM API code to Tridion 2011 Core Service code

Step 7:  Finishing up – polishing the GUI and adding another field

Step 1: GUI Extension Client-Setup – Show a popup (~30 minutes)

1. Get the GUI Extension WhoDidIt files from GitHub, https://github.com/rcurlette/WhoDidIt/downloads. Extract it and rename the files from WhoDidIt to our extension name. Rename the folder from ‘rcurlette-WhoDidIt-552c9a2’ to ‘BlueTools’ or your GUI Extension.

2. Rename the files 

  • WhoDidItCmd.js ->GuiExtensions\BlueTools\GuiExtension\client\js\BlueToolsCmd.js
  • WhoDidIt.css -> GuiExtensions\BlueTools\GuiExtension\client\css\BlueTools.css
  • WhoDidIt.config -> GuiExtensions\BlueTools.config

3. Update files.  Find / replace WhoDidIt and Sherlock with your tool name.

  • BlueTools.config -> Find / replace ‘Sherlock’ with BlueTools and ‘WhoDidIt’ with BlueCopy. Replace the text ‘Who Did It?’ with what text you want shown on the right-click, for example, ‘BlueCopy’.
  • Open the GUI Extension BlueToolsCmd.js file.  Find / Replace Sherlock with BlueTools and WhoDidIt with BlueCopy. Save.

4. Update the GUI Extension action – Open the BlueToolsCmd.js file, change the _execute method  alert message to ‘alert(‘Really Excellent!’);’ and comment out all lines starting with ‘var selectedID’ until popup.open();.  This update will show only the popup and comment out all other lines, not worrying about other client HTML / JS files.

5.  Update BlueTools.config file and add an assignid value.  Whenever you change the config file the GUI flushes the cache automagically.  Nice!  🙂

old:

<ext:extension name="BlueToolsExtension" assignid="" insertbefore="cm_refresh">

new:

<ext:extension name="BlueToolsExtension" assignid="BlueCopy" insertbefore="cm_refresh">

 

6. Deploy to Server – On the CMS server, create a new folder under ‘C:\Program Files (x86)\Tridion\web\WebUI\Editors’ for the new GUI Extension. I create a folder called BlueTools. Copy all the files in the GuiExtensions\BlueTools\GuiExtension folder to the server at ‘C:\Program Files (x86)\Tridion\web\WebUI\Editors\BlueTools’.  Then you should have BlueTools\GuiExtension.

7. Create IIS Virtual Dir –  Open IIS on CMS Server, Go To Web Sites, SDL Tridion 2011, WebUI, Editors. Right-click, select create a new IIS Virtual Directory to host the GUI Extension, name it BlueTools, and browse to the folder you copied the BlueTools GUI Extension to on the server.

8. Edit the System.Config located at ‘c:\Program Files (x86)\Tridion\web\WebUI\WebRoot\Configuration\System.Config‘, and let Tridion know about our new extension.

&lt;editor name="BlueCopy"&gt;
  &lt;installpath&gt;C:\Program Files (x86)\Tridion\web\WebUI\Editors\BlueTools\GuiExtension\&lt;/installpath&gt;
  &lt;configuration&gt;<strong>BlueTools</strong>.config&lt;/configuration&gt;
  &lt;vdir&gt;BlueTools&lt;/vdir&gt;
&lt;/editor&gt;

9. Flush browser cache.  (Ctrl-shift-delete in Chrome) Refresh the GUI, see our new option in the right-click context menu. Since WhoDidIt did not include a ribbon extension you will not have a ribbon button here.

10. Test the GUI Extension client using the right-click menu option ‘BlueCopy’. You should see an alert with the text ‘Really Excellent!’

*Note: On my first test I saw the text in the menu but clicking on it did not do anything! Opening up the Javascript console in Chrome (F12 key) and in the Console window I see this message: “Command ‘BlueToolsCommand’ is not registered“. To fix this I needed to add an ID to the <ext:extension line. Maybe this is because I have more than 1 GUI Extension registered and also inserting at the same position? For more info about all the values in the config file have a look at my previous post, http://www.curlette.com/?p=279.

old:

<ext:extension name="BlueToolsExtension" assignid="" insertbefore="cm_refresh">

new:

<ext:extension name="BlueToolsExtension" assignid="BlueTools" insertbefore="cm_refresh">

Review:

We did it! We have successfully added another GUI Extension Client. It doesn’t do much yet – no Tridion API magic.  Now time to create the server-side web service to do something with the Tridion API and call our popup from the _execute method.  If you have any problems – review the config file and my debug article.

Step 2:  GUI Extension Server Setup – Create the Web Service locally and call the Tridion Core Service (~15 mins)

1. Get the Tridion2011ServiceStack project from GitHub

2. Add your CMS Url.  Open the solution in Visual Studio 2010 SP1. Do a find / replace for TridionDev2011 with your CMS server name for all files in Solution. Change the look-in option to ‘Entire solution. You should have 53 replacements. Save all.

3. Update the web.config file and put in your CMS server URL, Username, and password

4. Add the Tridion Core Service DLL reference to the solution. Get it from your Tridion server in the /bin/client folder. Copy it locally before adding it – don’t add it from a network share. It is not included in the ServiceStack project because it is a Tridion file.

5. Step through code.  Build. Hit F5 (play) to Debug solution – the test page for WhoDidIt appears.  Note the url and port # visual studio uses in your browser. If your URL is not ‘http://localhost:61860’ then copy it and update the page ‘GetTridionItem.htm’, replacing the URL with your localhost URL. Otherwise, hit the ‘Go’ button and you should hit the breakpoint ‘ return Repository.GetByUri(request.Uri);’ in the OnGet method of our ‘TridionItemRepository’.

Review

Developing locally is great –  we can write our Tridion API code in the Service, develop and debug our Core Service Tridion API calls directly in our Visual Studio development environment.  Our test page calls the Tridion2011ServiceStack Web Service via AJAX and we hit our Service method calling the Tridion API and can step through the code. So far, so good.

Step 3:  Adding a new Web Service – Adding our new Service to ServiceStack (~15 mins)

1. Create a new model class. Right-click on the models folder, select ‘Add new class’.  Add any properties to the class you want to return to the js client. You can also copy/paste the properties from the TridionItem class. I am creating a ‘BlueCopyItem’ model and adding 3 properties I know I’ll need – Title, URI, and Error (to hold the error message to pass back to the js client).

namespace Tridion2011ServiceStack.Models
{
    public class BlueCopyItem
    {
        public string Title { get; set; }
        public string Uri { get; set; }
        public string Error { get; set; }
    }
}

2. Create a new Service class. This handles the request from the GUI Extension client.  Right-click on the Services folder, select ‘Add new class’. I called mine ‘TridionBlueCopyService.cs’. Copy / paste the code from TridionItemService. Replace ‘TridionItem’ with the name of your model class from step 1, ‘BlueCopyItem’. Don’t forget to change the ‘Look in’ option to ‘Current document’ and not ‘Entire Solution’.   You should have 4 replacements.  Also, select the match case – otherwise it will rename both your Class name (TridionItem) and the variable names (tridionItem).

Remember to inherit from the RestServiceBase class.

: RestServiceBase<BlueCopyItem>

3. Create a new Repository class. Right-click on the Repositories folder, select ‘Add new class’. I called mine ‘BlueCopyRepository’.  Copy / Paste code from TridionItemRepository.  Update the code – rename ‘TridionItemRepository’ with ‘YourModelClassRepository’. Replace ‘TridionItem’ with ‘BlueCopyItem’ and ‘tridionItem’ with ‘blueCopyItem’.  Remove the line 24 adding the LastModifiedProperty since we do not have it in our model. // remove -> tridionBlueCopy.LastModifiedBy = versionInfo.Revisor.Title;

4. Add our service mapping – Open AppHost.cs and add 1 more line below ‘.Add<TridionItem>(“/tridionItem”)’, where TridionItem is your model class name and /tridionItem is the URL you want to use for your web service. This can be whatever you want.  I added this:

.Add<BlueCopyItem>("/blueCopy");

5. Register our repository – In AppHost.cs register your new Repository. Add a new line below ‘container.Register(new TridionItemRepository());’ on line 62 and change TridionItemRepository with your repository name.

container.Register(new BlueCopyRepository());

6. Build, add namespaces as needed.

7. All done! No config needed. 🙂 Service Stack is built using the convention over configuration principle and steps 4 and 5 are all we need to do to make our new service visible to Service Stack.

8. Make a new test page. Copy / paste GetTridionItem.htm and give it a new name such as ‘BlueCopyTest.htm’

9. Put the new Web Service URL in the test htm page from the AppHost.cs file (ie’ /tridionBlueCopy). Replace ‘http://localhost:61860/api/tridionItem’ with ‘http://localhost:61860/api/yourServiceUrl’ located in the test htm file.  Mine is: ‘url: “http://localhost:61860/api/blueCopy”,’

10. Set the new test page as your default start page by right-clicking on it and choose ‘Set as Start Page’.

11. Add a breakpoint to the new Repository class (ie. BlueCopyRespository.cs), line ‘CoreServiceClient client = new CoreServiceClient();’ (assuming you did not change anything in the Repository code yet).

12. Hit play, run in debug mode. Your new htm test page should show up. Push the ‘Go’ button and your new breakpoint should be hit. Step through the Repository OnGet code, and at the end your page will show the Title and URI of the item. Congratulations – you are now ready to add your new code.

Note: If you get a popup and the text looks like jquery2189072189723131 then you’ve got an error in the Repository Tridion code. 🙂 Time to debug the server. I decided to place another breakpoint on the OnGet method in the BlueCopyService class. This is called first. I got into the debugger this time, but when pressing F11 to step into the repostitory I got a popup from Visual Studio saying it could not find my repository. I forgot to add it to the AppHost Repositories Funq container! To sovle this I opened the AppHost.cs file, and added

container.Register(new TridionBlueCopyRepository());

Review

It’s fun to add a new web service so easily and then step through the code in Visual Studio with the debugger.  Creating a web service and configuring it for test is not an easy step – there are several files involved and many places we find/replace the original class names with our new model class. No worries – once this is done you will not need to do it again for this web service. Also, I find it fairly straight-forward and if you follow the steps above you should have your new web service ready to go in no time. One advantage to this approach is you can call your new web service from any client, an HTML test page as shown above, your new GUI Extension, or a classic ASP custom page!

 

Step 4:  Deploy the GUI Extension Web Service to our CMS (~20 mins)

1. Copy Tridion2011ServiceStack files to server, usually I create a new folder under InetPub\wwwroot.  I called mine ‘BlueToolsWebService’.  I deploy my MVC website using the ‘Publish’ option of Visual Studio.  I have a drive mapped to my server and then choose ‘File System’ in the publish method listbox.  Then, in IIS, create a website to host the ServiceStack MVC Web Service (or host the Web Service as a Windows Service or Console App).  Don’t forget to change the App Pool to a .NET 4.0 App Pool or it will not run.  You may also want to run it on a different port.  In my previous post  I describe this in more detail.

2.  Test the Web Service.  Open a web browser and go to the URL of your web service.  You should see a reply from ServiceStack like this one:  “Snapshot of BlueCopyItem generated by ServiceStack”. This works! Open the popup.js file on our local dev box and chage the URL to the website URL from the browser.

3.  Debug the results in Chrome.  Now hit F5 and run the test page again in Visual Studio.  Use the Developer Tools (F12 key) and go to the Scripts tab.  Select the BlueCopyTest.htm file in the dropdown and set a breakpoint on the line with ‘ $(“#feedback”).html(“<div class=’successMessage’>Title’.  Now, hit ‘Go’ and our breakpoint will be hit.  then mouseover the data object in the line with ‘success: function (data) {‘ and see the title and uri properties.  You can also highlight ‘data’, right-click, and select ‘Add Watch’ to see the values.

 

Step 5:  Wire the GUI Extension client to the Web Service on the Server

1. Enable the popup.  Open the GUI Extension .js file with the _execute method. Mine is called ‘BlueToolsCmd.js’.  The location on the server might be something like: C:\Program Files (x86)\Tridion\web\WebUI\Editors\BlueTools\client\js\BlueToolsCmd.js UnComment the lines starting with ‘selectedId’ and ending with ‘popup.open’

2.  Add text to popup.htm.  The original WhoDidIt popup only had an AJAX call and does not display anything.  Let’s add ‘Hello World’ text to the popup.htm so we have something to see when we call it.

3. Confirm the url to the popup is working. Popup on server might be located at ‘WebUI\Editors\BlueTools\client\html’. Test this in the browser.  If your CMS URL is http://TridionDev2011 then the test URL would be http://TridionDev2011/WebUI/Editors/BlueTools/client/html/popup.htm.

4.  Test in CMS.  Now let’s clear our browser cache and try our GUI Extension again.  If you see the popup- congrats! If not, double-check your .js file _execute command, make sure it is deployed, and refresh your browser.  Also, open up the Chrome debugger or FireBug and see my post about debugging.

3. Add web service URL to popup.js. Our client is now 100% working and also showing the popup. Let’s call our new Web Service.  Change the URL property in the popup.js file located in the C:\Program Files (x86)\Tridion\web\WebUI\Editors\BlueTools\client\html\js folder to point to our new web service and try again. This assumes you have not changed any code in the repository class.

You will see the URL as url:  “‘http://TridionDev2011:8001/Tridion2011ServiceStack/api/tridionItem”. Change TridionDev2011 to your CMS URL and ‘tridionItem’ to your new Web Service URL (should look like your test htm page). My new url is ‘http://TridionDev2011:8001/BlueToolsWebService/api/blueCopy’  Note: Clear browser cache again and refresh.

4. Test in GUI, Debug the data returned in Chrome.

– Run GUI Extension

– When popup is open, load the Chrome Developer Tools (F12), scripts window, select popup.js.

– Put breakpoint on line $(“#suspect”).text(data.lastModifiedBy);

– Reload popup html window, breakpoint is hit.

– Minimize call stack window on right, open Scope variables

– Open Closure, data and see your properties here. This is your model object returned from ServiceStack. Notice your propery names are camelCased.

Review

This is the most critical part – where we see our 2 major pieces talking to each other. Give yourself a pat on the back – you’ve made it through the most difficult part.  Now we’re ready to move onto the real work – using the Tridion API to do something. Right now all the pieces are in place, working, and we’re finally ready!  The 5 pieces are:  Extension Config -> .js (with _execute) -> popup.htm -> popup.js -> Web Service -> Tridion Core Service

Step 6: Converting ASP TOM API code to Tridion 2011 Core Service code

Tridion introduced the Core Service in Tridion 2011 and announced this is the official way to talk with the Tridion API outside of the Event System or Templates.  We will use the Core Service to talk to the API and do the work.  Our AJAX call is passing the Component URI to the Web Service.

I do this all locally and use a local htm test page with the javascript / css locally as well.  Just as we did in Step 2 above – we will set a breakpoint in our Repository class and step through the Tridion Core Service Code.

In this example I need to port my existing classic ASP Custom Page code for copying an item and BluePrint children to the new Core Service.  Below are some highlights and points about the differences.

The Core Service code has 3 main parts:

1. Create a new copy of the Parent source item (Page or Component)
2. Get Localized Versions of the source item
3. For each Localized Version, localize the new copy and update the contents with the localized source item.

1.  Copy the Parent Tridion Object

TOM API:

Function CreateNewItemCopy(organizationalItemUri, itemType, title, xml, directory, filename)
	'response.write "create new item" & organizationalItemUri & "," & itemType & "," & title & "," & xml & "," & directory & "," & filename
	Dim newItem : set newItem = tdse.GetNewObject(itemType, organizationalItemUri)
	newItem.UpdateXml(xml)
	newItem.Title = title

	if(itemType = 64) then ' page
		newItem.FileName = filename
	elseif(itemType = 4) then ' sg
		newItem.Directory = directory
	end if

	newItem.save(true)
	CreateNewItemCopy = newItem.id
	set newItem = nothing
End Function

Core Service API: *Note: I did change the fundamental approach here since I now use the copy method

private string CreateNewItemCopy(string title, RepositoryLocalObjectData source, string filename)
        {
            string newItemUri = "";
            try
            {
                ItemType tridionItemType = GetTridionItemType(source);
                string orgItemUri = source.LocationInfo.OrganizationalItem.IdRef;
                var newItem = client.Copy(source.Id, orgItemUri, true, new ReadOptions());
                newItem.Title = title;
                if (tridionItemType == ItemType.Page)
                {
                    PageData pageData = newItem as PageData;
                    pageData.FileName = filename;
                    client.Update(pageData, new ReadOptions());
                }
                else
                {
                    client.Update(newItem, new ReadOptions());
                }
                newItemUri = newItem.Id;
            }
            catch (Exception ex)
            {
                throw;
            }

            return newItemUri;
        }

Highlights / Differences:

The Tridion TOM provides us a nice easy way to create content in any type of item – UpdateXml.  The Tridion Core Service does not have this method but instead uses an Update method on the Web Service client.  I posted a question on StackOverflow about this and got a great response – not only was my answer provided, but a new suggestion of using the Copy method of the API instead of UpdateXML. 🙂

Copy item – also passing in Read options to make sure I can read data later.

' VBScript / TOM
Dim newItem : set newItem = tdse.GetNewObject(itemType, organizationalItemUri)
newItem.UpdateXml(xml)
// Tridion CORE Service / .NET
var newItem = client.Copy(source.Id, orgItemUri, true, new ReadOptions());

2. Get Localized Versions

I really like the new approach with BluePrintChainFilterData instead of GetListUsingItems (from TOM) to get the localized child elements. The Core Service and the filter BluePrintChainFilterData also returns the Parent item – so watch out – you may need to filter it out as I do here. Big thanks to user978511 on StackOverflow for the help and example code http://stackoverflow.com/questions/9515647/getlistusingitems-with-tridion-core-service-returns-more-items-than-tom.

TOM API:

Function GetLocalizedItemNodes(itemUri)
	Dim tridionItem : set tridionItem = tdse.GetObject(itemUri,1)
	Dim rowFilter : set rowFilter = tdse.CreateListRowFilter()
	call rowFilter.SetCondition("ItemType", GetItemType(itemUri))
	call rowFilter.SetCondition("InclLocalCopies", true)
	Dim usingItemsXml : usingItemsXml = tridionItem.Info.GetListUsingItems(1919, rowFilter)

	Dim domDoc : set domDoc = GetNewDOMDocument()
	domDoc.LoadXml(usingItemsXml)
	Dim nodeList : set nodeList = domDoc.SelectNodes("/tcm:ListUsingItems/tcm:Item[@CommentToken='LocalCopy']")

	set tridionItem = nothing
	set domDoc = nothing
	set GetLocalizedItemNodes = nodeList
End Function

Core Service API:

private XContainer GetLocalizedItems(string itemUri)
        {
            XContainer localizedItems = null;
            try
            {
                BluePrintChainFilterData filter = new BluePrintChainFilterData();
                filter.Direction = BluePrintChainDirection.Down;
                localizedItems = client.GetListXml(itemUri, filter);
            }
            catch (Exception ex)
            {
                throw;
            }
            return localizedItems;
        }

3.  Update Localized Items

Some lines in the code commented out with //… – there is code there – please see the source code on GitHub.

TOM API:

Sub UpdateLocalizedItem(itemXml, itemUri, pubUri, filename, directory)
	Dim newTridionCopy : set newTridionCopy = tdse.getObject(itemUri,1, pubUri)
//...
	if(newTridionCopy.Info.IsLocalized = false) then
		newTridionCopy.Localize
	end if
	//...code removed...
	newTridionCopy.UpdateXml(itemXml)
	newTridionCopy.Title = newParentTitle

	' set sg and page props
	if(itemType = 64) then ' page
		newTridionCopy.FileName = filename
	elseif(itemType = 4) then ' sg
		newTridionCopy.Directory = directory
	end if

	newTridionCopy.Save(true)
// ...
End Sub

Core Service API:

private string UpdateLocalizedItem(string title, string uriLocalizedSource, string newItemUri)
{
	try
	{
		ItemType tridionItemType = GetTridionItemType(uriLocalizedSource);
		var newItem = client.Read(newItemUri, new ReadOptions()) as RepositoryLocalObjectData;
		var oldItem = client.Read(uriLocalizedSource, new ReadOptions());
		if (newItem.MetadataSchema != null)
		{
			var newItemMetadataSchema = client.Read(newItem.MetadataSchema.IdRef, new ReadOptions()) as SchemaData;
			newItem.Metadata = GetMetadata(newItem.Metadata, newItemMetadataSchema.NamespaceUri);
		}

		if (tridionItemType == ItemType.Page)
		{
			PageData newPage = newItem as PageData;
			PageData oldPage = oldItem as PageData;

			newPage.ComponentPresentations = oldPage.ComponentPresentations;
			newPage.Title = title;
			client.Update(newPage, new ReadOptions());
			return newPage.Id;
		}
		else if (tridionItemType == ItemType.Component)
		{
			ComponentData newComp = newItem as ComponentData;
			ComponentData oldComp = oldItem as ComponentData;

			newComp.Schema = oldComp.Schema;
			newComp.MetadataSchema = oldComp.MetadataSchema;
			newComp.Content = oldComp.Content;
			newComp.Metadata = oldComp.Metadata;
			newComp.Title = title;
			return newComp.Id;
		}
	}
	catch (Exception ex)
	{
		log.Error(ex.Source + "," + ex.Message + "," + ex.ToString());
		log.Error(ex);
	}
	return uriLocalizedSource;
}

 

Review:  Creating the Core Service code is where we get to talk with the Tridion API and some familiar old school objects and names come back into the light.  I usually do all my Core Service development locally, including debug, and only use the Server log files to know that something went wrong.  No more fighting with other developers over remote Windows Server sessions! 🙂  I cannot express enough how nice this is – and how it speeds up the development / debug / deploy cycle.  While there is a lot more to know about the Core Service to build good solutions – the community and documentation examples provided the help I needed.  Please grab the source code from GitHub for all the details.

 

Step 7:  Finishing up – polishing the GUI and adding another field

GUI Extensions are by nature a client-side HTML / JavaScript / jQuery application making Web Service calls.  The better your client side dev skills are – the better your GUI Extension will feel.  Unfortunately, most Tridion developers have spent little time doing client development (me included!) and this is a time consuming part of writing a GUI Extension.  We can no longer avoid JavaScript!

Adding new properties – SourceTitle and Filename

Currently we only return the title of the new copied item- but what if we wanted to also return the title of the original item?  No problem.

1.  Add the property to the Model

public class TridionCopyItem
    {
        public string Title { get; set; }
        public string SourceTitle { get; set; }
        public string Filename { get; set; }

2.  Set the property value

// Create the Response Object to send back via Ajax to our GUI Client
TridionCopyItem tridionItem = new TridionCopyItem()
{
	Title = GetCmsEditUrl(newItemUri, title),
	Uri = newItemUri,
	SourceTitle = itemToCopy.Attribute("Title").Value,
        Filename = filename
 };

3.  Read the value in the js client

success: function (data) {
$(document).ready(function () {
	/* Render the template with the movies data */
	$.each(data, function () {
		$('<div>' + this.sourceTitle + '<span class="icon-arrow-right" style="padding-right:4px;padding-left:4px;"></span>' + this.title + '</div>').appendTo("#componentList");
	});

 

Adding input fields to HTML form for the Title

Adding another input field is no problem.  We simply add it to our HTML form and it automatically gets serialized by jQuery into JSON and sent via AJAX to our ServiceStack Web Service.  In the Web Service our Model should have a Property with the same name, and our Service class needs an input parameter with the same name.

Look and feel

I use the Twitter Bootstrap CSS framework for all custom pages and GUI Extensions.  This time I also decided to adopt the Golden Ratio for the popup size.  Overall I am very happy with the design and the look.

I added more jQuery and HTML to the final form but did not change the Web Service.  Maybe this is typical for a GUI Extension to first get the Core Service working and then spend lots of time polishing the jQuery and HTML interaction with the user. Consider the skillset for your extensions – find your local JavaScript / jQuery expert and get them involved in the GUI Extension project.

Summary:

Building GUI Extensions involves 3 main activities.  First, get the menu option in the GUI and a popup saying ‘Hello’.   Second, setup the Web Service.  Third, get the Core Service doing the magic bits with the Tridion API.  The first step, with the GUI, involves a lot of server-side work of updating config files, deploying js files, and working with IIS.   However, the Tridion API work with the Core Service feels completely different – doing the work in the Visual Studio development tool and being able to iterate quickly.  Overall I like the separation of concerns – it just needs to become clear in our minds what happens where and we can easily design nice GUI Extensions without too much work.

I hope you managed to follow along and feel more comfortable about creating GUI Extensions.  Now time to start coding the next one…  🙂

Downloads

WhoDidIt? GUI Extension Files– Start
BlueCopy GUI Extension Files – Solution

Tridion 2011 provides us with great possibilities to improve the user experience for our Authors and Editors using GUI Extensions. We can add new items to the context-menu, new icons to the ribbon, or even new tabs in the edit screen of a Component. All of this is possible thanks to the new Anguilla framework introduced in Tridion 2011. There is a lot to understand before you can make your first usable GUI Extension and in this article I will explain what I learned while creating my first GUI Extension.  This is a 3-section tutorial covering all aspects to create a GUI Extension, including the Configuration, JavaScript, and Tridion API calls.

Architecture – Tridion Custom Page (ala R4 and R5)

In the old school way using Tridion R4 or R5 we would create a custom page in classic ASP and directly instantiate the Tridion API COM+ TDS.TDSE object.  This gave us direct access to the Tridion API from our ASP Script and worked well since we had our ASP page in the Tridion CMS Website. However, we combined our display HTML with our code logic, needed to postback to the same page, and use if-conditions to determine to process the form or not. In addition, it was hard to test and debug, often limited to writing out strings of text.  Here is what the old-school Tridion Custom Page architecture looked like:

Tridion Custom Page

Architecture – Tridion R6 (aka Tridion 2011) GUI Extension

Tridion GUI Extension Overview

The main idea is the client and server are separated, with the client using mostly JavaScript and a little HTML and the server using a Web Service, .NET, C#, and the Tridion API.  The _execute method in the GUI Extension JavaScript file is run when the user clicks the GUI Extension button.  Usually we display a GUI Extension Interface popup and that popup is what does the work of getting the user input (if you need more than the item URI) and then calling a web service to do the heavy lifting with the Tridion API.  This architecture applies a clear separation of concerns – from getting and showing feedback to the user via the HTML page and interacting with the Tridion API in the Web Service layer.

Concept – Who Did It?

The goal is to show the last person who modified the item.  I call it ‘WhoDidIt’ and is part of the Sherlock namespace. I am a big fan of the books and also the recent BBC series and felt this was an appropriate name for the feature but also for the deep investigation work into how GUI Extensions are created.  It is implemented as a right-click context menu item and does not include a ribbon extension.

Overview – 3 main steps to perform when building a Tridion 2011 GUI Extension

1. Get your button in the ribbon or your link in the context menu. This is death by config. If it doesn’t kill you, there is a good chance you will have your GUI extension working.  GUI Extension button-click calls _execute method in your .js file, referenced in the config.  _execute contains a JavaScript call to show a popup

2. Show a popup HTML page when someone clicks on #1.  Popup makes an AJAX call to a web service.

3. Do something using the Tridion API from the popup via an AJAX call to the Web Service that uses the Tridion Core Service to interact with Tridion.

Some personal choices I made:

– Keep the popup plain and simple HTML and JavaScript/ jQuery. I have seen others use an ASPX page with some server-side control references. Too complicated and difficult to debug – let’s keep it simple and use JavaScript frameworks here in the client.

– Use ServiceStack for the Web Service layer – super-simple, clean, JSON-friendly, easy to call from AJAX

Sections of this tutorial:

Installing the Extension

Files: Client

Server

Installing the GUI Extension Client

1. Copy files to Tridion CMS Server. Location: Tridion\web\webUI\Editors

2. Open IIS and create a new Virtual Directory

VDIR for Tridion GUI Extension

3. Edit Tridion GUI System.Config file and tell Tridion about the new Extension. Hint: If an extension is misbehaving and breaking your GUI, comment it out in this file. Location: Program Files (x86)\Tridion\web\WebUI\WebRoot\Configuration\System.config

    <editor name="WhoDidIt">
      <installpath>C:\Program Files (x86)\Tridion\web\WebUI\Editors\WhoDidIt\</installpath>
      <configuration>WhoDidIt.config</configuration>
      <vdir>WhoDidIt</vdir><!-- Must match IIS Virtual Dir name -->
    </editor>

4. Recycle IIS Application Pool. Empty browser cache. Update from Peter K:  “You don’t have to recycle the app pool when you update the configuration. Increment the “modification” attribute in the configuration file and your cache will automatically be invalidated for all clients (so no need to clear the browser cache)”.  Test.

Installing the GUI Extension Server – Create the MVC3 Website for ServiceStack

1. Open the Visual Studio Solution and add the Tridion references to the Core Service DLL – Tridion.ContentManager.CoreService.Client dll located on the Tridion server in the bin/client folder. Also, I suggest to do a find and replace for ‘TridionDev2011’ with the CMS URL of your server. You should have about 55 replacements. (thanks to WCF config for the high # of refs)

2.  Create a new folder under Inetpub\wwwroot for the Web Service and copy the Web Service files there. If you can map a drive to your root folder on the Tridion CMS then you can easily use the ‘Publish’ option in Visual Studio to deploy your project. Simply right-click onthe project, select publish, chose file copy, then put the full path (including mapped drive) to the IIS site and select publish.

3.  Create a new App Pool in IIS for the TridionServiceStack ASP.NET 4.0 site.

4.  Create a new Website in IIS and point to the files in step #1.  I usually put this on a different port, such as 8001.

5.  Open the web.config file and change the Tridion Core Service URL references from Dev2011Tridion to your CMS Server URL.

 

Tridion GUI Extension Configuration Explained – WhoDidIt.config

Tridion Configuration is the first major step you need to understand to get a working GUI Extension. This is where we add an option to the GUI and is part of our ‘client’. We do not do any Tridion API calls in the ‘client’ part – it is all JavaScript. In my experience it was by far the most difficult part of the process and is why I dedicate 30% of this tutorial on the configuration. I extensively used the 8 steps post by Yoav Niran and the Hello World post for starting with GUI Extensions. When the going got tough I went to the Tridion StackOverflow community. Thanks to Chris Summers for helping clarify CommandSet config and John Winter for help with the GUI Extension icon.

Configuration Groups:

This is a list of resources you want available in the _execute method after the user clicks your button / link in the GUI. Not in the popup you will open very shortly from the _execute method. So, for example, if you reference jQuery here, you will have it avail in your _execute method, which is very handy, but not in your popup.

Name your config. This is one of those names you’ll use later, and when wrong, nothing will work.

<cfg:group name="Sherlock.ConfigSet" merger="Tridion.Web.UI.Core.Configuration.Resources.CommandGroupProcessor" merge="always">

3 types of files you will often see in the config:

  • <cfg:file type=”script”> – js file containing _execute method
  • <cfg:file type=”style”> – css file containing icons for extension
  • <cfg:file type=”reference”> – name of the commandset attribute, <cfg:commandset id=”Sherlock.Interface”>

* This is one of the difficult dependencies that is not documented or really explained and almost drove me mad. When this is wrong you will see a message like ‘Sherlock.Command’ does not have a reference.

OK – these are the highlights of the config section, and it is here in it’s entirety:

<cfg:groups>
  <cfg:group name="Sherlock.ConfigSet" merger="Tridion.Web.UI.Core.Configuration.Resources.CommandGroupProcessor" merge="always">
    <cfg:fileset>
          <cfg:file type="script">/client/js/dependencies/jquery.js</cfg:file>
          <cfg:file type="script">/client/js/dependencies/infoMessage.js</cfg:file>
          <cfg:file type="script">/client/js/utils/utils.js</cfg:file>
          <cfg:file type="style">/client/css/WhoDidIt.css</cfg:file>
          <cfg:file type="script">/client/js/WhoDidItCmd.js</cfg:file>
          <cfg:file type="reference">Sherlock.Interface</cfg:file>
    </cfg:fileset>
    <cfg:dependencies>
      <cfg:dependency>Tridion.Web.UI.Editors.CME2010</cfg:dependency>
      <cfg:dependency>Tridion.Web.UI.Editors.CME2010.commands</cfg:dependency>
    </cfg:dependencies>
  </cfg:group>
</cfg:groups>

Extension definition

Next is the extension definition. Basically, the text of the context-menu item and where it goes. This was the least problematic for me and almost always worked as expected. Maybe the fact it has the least amount of dependencies helped.

The text of the context-menu item is here as the ‘name’. Why didn’t they make an attribute called displayText? I have no idea, and this is one of the places where a name doesn’t have a dependency. Also, the id is not used anywhere else. The command is used later in the Commands section.

<cmenu:ContextMenuItem id="cmExtWhoDidIt" name="Who did it?" command="SherlockCommand"/>
      • Name: Text shown in content-menu
      • Command: Name of command in Commands section (discussed later)
      • ID: Used to define icon image in the CSS file

Another important dependency is to our config section above:

<ext:dependencies>
  <cfg:dependency>Sherlock.ConfigSet</cfg:dependency>
</ext:dependencies>

OK, with that behind us, we are ready to move on. Note, I did not implement a ribbon button for this extension. Full code below:

<extensions>
  <ext:dataextenders/>
  <ext:editorextensions>
    <ext:editorextension target="CME">
      <ext:editurls/>
      <ext:listdefinitions/>
      <ext:taskbars/>
      <ext:commands/>
      <ext:commandextensions/>
      <ext:contextmenus>
        <ext:add>
          <ext:extension name="SherlockExtension" assignid="" insertbefore="cm_refresh">
            <ext:menudeclaration>
              <cmenu:ContextMenuItem id="cmExtWhoDidIt" name="Who did it?" command="SherlockCommand"/>
            </ext:menudeclaration>
            <ext:dependencies>
              <cfg:dependency>Sherlock.ConfigSet</cfg:dependency>
            </ext:dependencies>
            <ext:apply>
              <ext:view name="DashboardView"/>
            </ext:apply>
          </ext:extension>
        </ext:add>
      </ext:contextmenus>
      <ext:lists/>
      <ext:tabpages/>
      <ext:toolbars/>
      <ext:ribbontoolbars/>
    </ext:editorextension>
  </ext:editorextensions>
</extensions>

Commands Section – Your link to the JS Magic

Last comes the most critical part of all – the commands section that contains a link to our js file. While not so obvious, it is the magic that makes this sparkle.

First, we link to our reference made up in the config. First dependency.

<cfg:commandset id="Sherlock.Interface">

Next, we specify the Namespace of the js file with our _execute method in it. Super important. Also, note the name of the command is used in the extensions config above.

<cfg:command name="SherlockCommand" implementation="Extensions.WhoDidIt"/>

Finally, comes the last important part of the config, the dependency on the config section.

<cfg:dependencies>
  <cfg:dependency>Sherlock.ConfigSet</cfg:dependency>
</cfg:dependencies>

Phew – we made it. Full config file here on GitHub for your viewing pleasure.

OK – that was step 1. I am almost out of breath, but let’s pretend it was only a 3 line config and we didn’t waste too much of our time with it.

Do Something – Show the users a popup from the GUI Extension

Now the fun part begins. Let’s get the JavaScript in place.

To setup the main methods we need to enable the interface, tell the Tridion GUI when our extension is available and enabled, and then give it code to fire when we hit our button. I will simply show the boiler-plate code here and you can rename the functions to suit your needs. The IsEnabled method is interesting in that if more than 1 item is selected the button is disabled in the context menu. Cool! This is something from Jaime Santos’s HellowWorldCM post. Notice the alert in the execute method.

WhoDidIt.js

Type.registerNamespace("Extensions");

Extensions.WhoDidIt = function Extensions$WhoDidIt()
{
  Type.enableInterface(this, "Sherlock.Interface");
  this.addInterface("Tridion.Cme.Command", ["WhoDidIt"]);
};

Extensions.WhoDidIt.prototype.isAvailable = function WhoDidIt$isAvailable(selection, pipeline)
{
    // Only show option for versioned items
    var items = selection.getItems();
    if (items.length > 1)
        return false;

    if (items.length == 1) {
        var item = $models.getItem(selection.getItem(0));
        if (item.getItemType() == $const.ItemType.STRUCTURE_GROUP || item.getItemType() == $const.ItemType.FOLDER || item.getItemType() == $const.ItemType.PUBLICATION) {
            return false;
        }
        return true;
    }
};

Extensions.WhoDidIt.prototype.isEnabled = function WhoDidIt$isEnabled(selection, pipeline) {
  var items = selection.getItems();
  if (items.length == 1) {
    return true;
  }
  else {
    return false;
  }
};

Extensions.WhoDidIt.prototype._execute = function WhoDidIt$_execute(selection, pipeline) {
  alert('hello');
}

OK – now we are at an interesting place and if we have our config in good order, our VDIR setup in IIS, our extension added to system.config, and all our files deployed to IIS, we might see something. Time to test. I suggest to start with my files and naming, etc, and then change 1 by 1 to your naming scheme.

JavaScript for GUI Extension

Next, let’s do something a little more interesting, show a popup. Code borrowed from Powertools / other GUI Extension examples. Note the selectedId is the item URI and part of the querystring. This is very important and we use it later on.

Extensions.WhoDidIt.prototype._execute = function WhoDidIt$_execute(selection, pipeline) {
    // Comment line below once client is working and you want to test the server
    //alert('Excellent!');

    // UnComment - Show Popup that calls Web Service using AJAX
    var selectedID = selection.getItem(0);
    var host = window.location.protocol + "//" + window.location.host;
    var url = host + '/WebUI/Editors/WhoDidIt/client/html/popup.htm?Uri=' + selectedID;
    var popup = $popup.create(url, "toolbar=no,width=400px,height=200px,resizable=false,scrollbars=false", null);
    popup.open();
};

Popup.htm:

<html>
<head>
  <script src="js/third-party/jquery-1.5.1.js" type="text/javascript"></script>
  <script src="js/third-party/jquery.ba-bbq.min.js" type="text/javascript"></script>
  <script src="js/popup.js" type="text/javascript"></script>
</head>
<body>
  <div><span id="suspect"></span> did it!</div>
</body>
</html>

Do you notice the js files were not in our extension config? That is because we do not need them within the execute method. The BBQ jQuery function is to serialize our querystring params into a json object that we pass to our web service. The AJAX magic is in the popup.js file.

popup.js contains a jQuery AJAX call to the web service:

$(function () {
    dataString = jQuery.param.querystring(window.location.href);
    $.ajax({
        type: "GET",
        url: "http://TridionDev2011:8001/Tridion2011ServiceStack/api/tridionItem",
        data: dataString,
        dataType: "jsonp",
        success: function (data) {
            $(document).ready(function () {
                $("#suspect").text(data.lastModifiedBy);
            });
        },
        error: function (request, status, error) {
            alert(request.responseText);
        }
    });
});

Use the jQuery BBQ library and serialize the Uri param from the querystring.

dataString = jQuery.param.querystring(window.location.href);

Specify the URL of our ServiceStack web service

url: "http://TridionDev2011:8001/Tridion2011ServiceStack/api/tridionItem",

Use jsonp since I run the Web Service on a different port and the browser treats it like a different domain and will not post if using only json.

dataType: "jsonp",

Update the HTML <span/> element with id=suspect after the DOM is loaded:

$(document).ready(function () {
  $("#suspect").text(data.lastModifiedBy);
});

This code runs on Page Load since we want to find out who did it right away and not waste another moment! We only need the URI to find out who did it and don’t need any extra info from the user.

OK, we’re done here on the client side of things, and while it feels like a lot of work (and is) the fun part of working with the Core Service has not yet begun.

Create the Server with Tridion API References using ServiceStack and Tridion API

I am always impressed how easy and quick it is to work with ServiceStack. I host it within an MVC 3 application, so if you decide to follow this approach you’ll need to install MVC3 on your server. Using the WebPI installer from Microsoft it is fairly painless and 100% automated.

Create ServiceStack project

The ServiceStack Web Service is created to call the Tridion API via the Core Service. You can run the Web App in Debug mode on your client development machine and step through the Core API calls. This is a very fast dev cycle when using the Tridion API and takes out the step of copying files to the server. Make sure your URL references / login info in the web.config is correct and you’re all set.

1. Create an empty MVC 3 Web App

2. Using NuGet, add a reference to ServiceStack MVC app. It downloads a lot of references.  See my ServiceStack post for more info on getting started.

3. Create a Services and Repositories folder.

4. Create a new class in the Model folder and give it string properties for whatever you want to pass back. Note, ServiceStack will camelCase all your variables for you in the JSON response.

5. Create a new class in the Services folder. Implement the RestBaseService<Type> method (see the Todo example). Have 1 method for each response type – if not using then return null.

6. Create a new class in the Repositories folder. Implement the Get method, Store, etc. I copy the ToDo repository and remove methods not used.

7. Add the URI / Model class to the App_Start/AppHost.cs file. For example,

Routes.Add<TridionItem>("/tridionItem");

8. Register the repository in the same file:

container.Register(new TridionItemRepository());

9. Update Global.asax to have /api/ ignored by MVC and avoid annoying favicon errors.

routes.IgnoreRoute("api/{*pathInfo}");
routes.IgnoreRoute("favicon.ico");

Add Tridion code to ServiceStack GetByUri Repository method:

TridionItemRepository.cs Code to get Last Modified By (Revisor) of item:

  public class TridionItemRepository
    {
        public TridionItem GetByUri(string uri)
        {
            TridionItem tridionItem = new TridionItem();
            try
            {
                CoreServiceClient client = new CoreServiceClient();
                client.ClientCredentials.Windows.ClientCredential.UserName = ConfigurationManager.AppSettings["impersonationUser"].ToString(); // "administrator";
                client.ClientCredentials.Windows.ClientCredential.Password = ConfigurationManager.AppSettings["impersonationPassword"].ToString();
                client.ClientCredentials.Windows.ClientCredential.Domain = ConfigurationManager.AppSettings["impersonationDomain"].ToString();
                IdentifiableObjectData objectData = client.Read(uri, null) as IdentifiableObjectData;
                FullVersionInfo versionInfo = objectData.VersionInfo as FullVersionInfo;
                tridionItem.Title = objectData.Title;
                tridionItem.Uri = uri;
                tridionItem.LastModifiedBy = versionInfo.Revisor.Title;
            }
            catch (Exception ex)
            {
                tridionItem.Error = ex.Source + ", " + ex.Message + ", " + ex.ToString();
            }
            return tridionItem;
        }
    }

Steps to implement:

Core Service references. This info is also in the Tridion Live Documentation.

1. Make a reference in Visual Studio to the Tridion.ContentManager.CoreService.Client dll located on the Tridion server in the bin/client folder.

2. Make a web service reference to your server:

http://TridionDev2011/webservices/CoreService.svc

3. Update the config of the web service reference in web.config with the config in the Tridion Live documentation.

Create an instance of the core service, making sure to add user info. Thanks to Andrey’s blog post for the impersonation info.

CoreServiceClient client = new CoreServiceClient();
client.ClientCredentials.Windows.ClientCredential.UserName = ConfigurationManager.AppSettings["impersonationUser"].ToString(); // "administrator";
client.ClientCredentials.Windows.ClientCredential.Password = ConfigurationManager.AppSettings["impersonationPassword"].ToString();
client.ClientCredentials.Windows.ClientCredential.Domain = ConfigurationManager.AppSettings["impersonationDomain"].ToString();

Get a Tridion Object

 

TryCheckOut and Read are the new GetObject. Why Tridion R&D decided to take a well known method name like GetObject and replace it with Read and TryCheckOut was a big surprise to me and cost time to figure out where it went. I was lucky enough to find an example from Ryan Durkin on Uploading Images using the Core Service.

IdentifiableObjectData objectData = client.Read(uri, null) as IdentifiableObjectData;

Version Info

VersionInfo comes in 2 flavors, FullVersionInfo and BasicVersionInfo. At first I tried with BasicInfo and it did not contain the Revisor property.  It was in the FullVersionInfo  and I discovered this while debugging using the Visual Studio debugger and locals window. Also, a good time to point out that I wrote and debugged all the Core Service code on my desktop, not on the server. Very nice feature of working with the Core Service!

Model Class containing properties

namespace Tridion2011ServiceStack.Models
{
    public class TridionItem
    {
        public string Title { get; set; }
        public string Uri { get; set; }
        public string LastModifiedBy { get; set; }
        public string Error { get; set; }
    }
}

ServiceStack works with POCOs (Plan ‘Ol CLR Objects) to define DTOs (Data Transfer Objects) that contain the properties to serialize for the JavaScript client.  Populate the DTO with Tridion info and return it.  ServiceStack does the serialization behind the scenes and we don’t have to worry about it. Note, these names will be changed to camelCase and therefore look like this in the client:

        • title
        • uri
        • lastModifiedBy
tridionItem.Title = componentData.Title;
tridionItem.Uri = uri;
tridionItem.LastModifiedBy = versionInfo.Revisor.Title;

Test

The Web Service can be tested using the HTML page in the Visual Studio Solution named GetTridionItem.htm.  Use the FireBug debugger and the network tab to see the response sent back from the Web Service.  Make sure to change the URL of the web service to the yours.  The URL should be the local URL from your debugging session – something like this http://localhost:61860/api/tridionItem .

Testing the GUI Extension client is best done with a js alert.  Once this is working then you should test calling the Web Service.  Again, make sure the URL to the web service is correct.  Use firebug to test this.  If you do more extensive coding in your _execute method then see my tips for debugging the GUI Extension js.

Check the web.config and make sure your Tridion User Info is there as well as the URL pointing to your CMS.

If you are running locally to test your Web Service Tridion API calls, change the URL in the TridionGetItem.htm page to something like:

url: "http://localhost:61860/api/tridionItem"

Set the breakpoint in the Repository class or even the js of your htm page and have fun debugging!

Summary

It is a real good feeling becoming familiar with the GUI extension framework and having so much potential at our fingertips. Once everything is setup and configured it is much easier to add new features and iterate on a working example. I hope I have helped demystify the elements in a GUI extension and given you a good place to start working with it. This article could not have been possible without all the GUI Extension and Core Service examples already created in the community as well as the official Tridion documentation. I hope we can continue improving the architecture of the config file and setup to make it even easier for developers to get started with writing extensions. Please give feedback. Thanks!

Download

Get the source code on GitHub.

While entering into the world of GUI Extension programming I have found it is another world where we need new tools and approaches to supplement our classic web development view.  For me it was an entirely different way of working, something I am still getting used to.  Today I discovered 2 things that I hope will help you get more comfortable in the new Tridion 2011 GUI Extension world.

Debugging JavaScript in Tridion 2011 GUI
Debugging has always been an art and the art is elevated with Tridion GUI Extensions, where everything starts with JavaScript.  I prefer to use Chrome for Tridion 2011 – it has the fastest JavaScript engine at the moment and this gives the fastest Tridion performance.  The developer tools included in Chrome are very good and using them is the key to debugging your new GUI Extension JavaScript.  I am using Tridion 2011 SP1.

1.  Open the Tridion 2011 GUI in Google Chrome browser
2.  Open Developer Tools (F12)
3.  Scripts tab
4.  In the file listbox, choose ‘Dashboard_v6.1.0.55920.10_aspx?mode=js’ located in WebUI/Editors/CME/Views/Dashboard/
5.  Use the search box (top-right of Dev Tools) to find some text from your _execute method in the js GUI Extension code.  For me it starts at around line 85702.
6.  Set a breakpoint by right-clicking the line # and add breakpoint
7.  Refresh the GUI, hit the button for your extension, and the breakpoint will be highlighted in the bottom debug window.
8.  On the right side of the debug window are the Watch Expressions, Call Stack, Scope Variables, etc.  I prefer to minimize Call Stack and expand Scope Variables.
9.  Step through the code by using the down-arrow on the right side.

Debugging Breaking Javascript Errors
Let’s say you forget to end a line with a ;.  That is bad js and will not compile.  If your JavaScript has an error then the Tridion GUI will be blank.  See below.  Tridion tries to load the js in your GUI Extension when it loads the browser, and as we can see from above it ends up in the main JavaScript of the GUI itself.  If you have breaking code (or even just write ‘something’ text in your js) it will break the GUI.  Good JavaScript programming practices is a must here!

Tridion GUI Extension js error

Solution
Have no fear, the Chrome debugger is here! Go to Console, see the red X with the error, click on the link on the right side with the Dashboard filename.  Your breaking error is shown.

Getting a popup URL
OK – now for a programming tip.  Once you get into the _execute statement then you might want to show a popup to get input from the user before performing actions.  This example uses the excellent HellowWorldCM tutorial from Jaime.  Here is 1 way to show a popup:

Extensions.HW.prototype._execute = function HW$_execute(selection, pipeline) {
var host = window.location.protocol + "//" + window.location.host;
var url = host + '/WebUI/Editors/HelloWorldCM/client/html/popup.htm#popup=UID_355';
var popup = $popup.create(url, "toolbar=no,width=600px,height=300px,resizable=false,scrollbars=false", null);
popup.open();

Also, if you are using Jaime’s example, comment out the message center code because in Tridion 2011 SP1 there are changes in the message center that are not compatible with this code.

//        var msg = $messages.createMessage("Tridion.Cme.Model.InfoMessage", "HELLO WORLD EXTENSIONS", ...
...
//        $messages.registerMessage(msg);

Setting up the IIS Virtual Directory
If you have any issues with the IIS Virtual Directory you will see the Tridion Minimalist view of the GUI.  This is the new cool thing – not very functional, but that is not the point.  😉

Update:  You will also see this view if any file paths in the  <cfg:fileset> of your GUI Extension cannot be found!

Tridion GUI Extension IIS VDIR Error

Likely the IIS Virtual Directory is not there or the name of the Virtual Directory does not match the name of the VDIR paramatere in the Extension config inside the system.config file.  It looks like:

<vdir>HelloWorldCM</vdir>

.  Get this in sync and you can again enjoy the full splendor of Tridion 2011.

Happy debugging!