Grid derefs null fields when items list in JSON is empty

[dkarr]

I have a page with a Dialog that contains a Grid. The URL for the store for the grid varies depending on what source link spawned the request (a link in a grid row). I create the store and Grid programmatically when the source link is clicked. Some of the source links will result in a JSON object with an "items" list that is not empty. This has no problem. Some of the source links will result in a JSON object an empty "items" list. Although this should be perfectly fine, which should result in a grid showing 0 rows, it instead throws the following error:

    TypeError: this.headerContentNode.firstChild is null

I've tracked this down to the following in DataGrid.js.uncompressed.js:

    getColumnsWidth: function(){
	    return this.headerContentNode.firstChild.offsetWidth; // Integer
    }

In my test case, "this.headerContentNode.firstChild" is null, so this results in an error. There are six other locations in this file that make a similar dereference to "firstChild", which will throw an error if executed in a similar test case.

I can see that a "simple-minded" fix for this, like returning zero in a case like this, would NOT be sufficient, as the Grid still needs to have the same width that it does when it has data.

I've built a standalone test case for this, which I'll attach, but unfortunately I can't be sure it will ever demonstrate the problem, because I'm running up against a different bug, #9046. I've tried numerous variations to try to avoid this in the test case, to no avail. I'm not sure now why my original application doesn't demonstrate this other problem.

[bill]

Sounds like grid is doing sizing on creation when it should be waiting for the resize() call (if it is inside a layout container). I thought we fixed this for 1.3 but maybe not... to confirm, this is happening in 1.3 and not just 1.2?

[Nathan Toone]

This appears to be fixed in the trunk.