Grid recreates widgets using as formatter output twice on expandable rows

[Emilio Zegarra]

we are making use of the EnhancedGrid? widget in our application. As part of the design, we have followed similar instructions as documented in ​http://archive.dojotoolkit.org/nightly/dojotoolkit/dojox/grid/tests/test_expand.html to create an expandable row. We further customized this to return a widget rather than a String as documented in http://dojotoolkit.org/reference-guide/1.7/dojox/grid/DataGrid.html#usage referring to the return of widgets in the formatter function.

We are actually returning a grid Widget which is populated using an ObjectStore? that retrieves its information from a RESTful store. During our performance evaluation, we noted that there were to HTTP GET calls being initiated whenever a row was expanded. This lead us to believe that the widget was getting created twice whenever the row was expanded.

I was able to put breakpoints in the formmater and noted that the following lines of code in the (dojox/grid/_Grid.js) are invoked one after the other:

updateRow: function(inRowIndex){

....

this.views.updateRow(inRowIndex);

this.scroller.rowHeightChanged(inRowIndex);

....

},

tracing these two function calls, it is noted that both of them make calls to (dojox/grid/_View.js) where the function buildRow() which recreates the row contents is invoked.

We suspect that this is the source of our problem.

[bill]

DojoX Grid and EnhancedGrid are deprecated in favor of ​dgrid and ​gridx.

You should upgrade your code to use one of those two grids.

We will consider patches to the old DojoX Grid code though.