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Checkboxes column, PageOnScrolling and GroupBy JS bug

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Alex asked on 25 Apr 2012, 02:58 PM
I created a column for checkboxes based on the example described here:
I enable PageOnScrolling
I chose a random column to group by.
I scroll down the grid and get the following exception in Javascript: 'MyPropertyName' is undefined
This is the function that throws the exception.

function anonymous(data) {
var p=[];with(data){p.push('<input type=\'checkbox\' name=\'checkedGroup\' value=\'', MyPropertyName ,'\' />');}return p.join('');

I've disabled all javascript that works with the checkbox column on grid events, so the only thing left is the ClientTemplate that creates the checkboxes

columns.Bound(o => o.MyPropertyName)
                   .ClientTemplate("<input type='checkbox' name='checkedGroup' value='<#= MyPropertyName #>' />")
                   .HtmlAttributes(new { style = "text-align:center" })

I don't have this exception when there is no GroupBy column.

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answered on 25 Apr 2012, 04:31 PM
I was able to prevent the javascript error by checking for undefined as such:

.ClientTemplate("<input type='checkbox' name='checkedGroup'
                        value='<#= (typeof MyPropertyName !== 'undefined')
                                   ? MyPropertyName
                                   : 0 #>' />"

I also had to do this check for all my other client template strings, like 'Yes' / 'No' boolean conversions and Date formatting.  The problem seems to be bigger though.  PageOnScrolling just breaks GroupBy altogether.  The first page displays OK.  But as I scroll down the 2nd page removes the GroupBy formatting in the grid, and adds some blank rows at the bottom (probably why I was getting the javascript errors in the first place).  I'm using TelerikMvcCustomBindingGridHelper so maybe the format of the GroupBy isn't what's expected by the Telerik Grid for PageOnScrolling?
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