Load GUI extension only in certain view

Question

I am building a GUI extension (for Tridion 2013 SP1). The GUI extension has a DataExtender (which adds a column to the component presentations list on a page view). When I examine the logging of the DataExtender, I see that GUI extension is loaded in all kind of views. That is not what I want because this will slow down the performance of Tridion a lot. I want to load the GUI extension only in the PageView, because that is the only place where the output of the DataExtender is used (see the <ext:view> element in the screenshot).

I already have read this solution: Load GUI Extension JS Files for 1 View but this is only for not loading certain files in a view. What I want is that the dataextender + editorextension is not loaded in other views (so the code is not executed every time).

My question: how to prevent dataextender + editorextension (or whole GUI extension) to only load in a certain view?

Answer 1

Data Extenders are cached in memory and called for every request. The overhead is minimal, so I don't think you need to be concerned with that.

Within your data extender, though, you should check if the request is for a list that you want to add your data to -- before you do any other processing. Check the command and other entries in the context object to determine the relevance.

As for the column, your configuration looks correct so I would expect it to only show up in the Page editing screen.

Answer 2

Please use the itemtype filter in your JS to enable the gui extension when you need it. Something like:

getItemType(Selecteditem) == 'tcm:64'

This will ensure your GUI is enabled only for pages

Answer 3

In Your js you can check the type of view that you have active.

For example, if you are in a page view, you can check the type this way with js:

$display.getView().getTypeName()

Then you can put some validation like that when you are defining your command:

Extensions.MyExtension.Commands.Sample.prototype._isAvailable = function Sample$_isAvailable(selection) {
     if ($display.getView().getTypeName() == "Tridion.Cme.Views.Page") {
            return true;
      }
};