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dhtmlxgrid assign value to ro/ch

hi, how to assign value to ro/ch in XML file and how to read it in Grid event

<?xml version='1.0' encoding='iso-8859-1'?>
<rows>
    <row id='0'>
        <cell type="ch">0</cell> ===>How to assign value if Checked value is '230202'
        <cell>0002091188</cell>
        <cell>2682</cell>
    </row>
</rows>


<?xml version='1.0' encoding='iso-8859-1'?>
<rows>
    <row id='0'>
        <cell type="ra">0</cell> ===>How to assign value if selected value is '230202'
        <cell>0002091188</cell>
        <cell>2682</cell>
    </row>
</rows>

How to access the value using Grid Events

You can't really assign value directly to ch|ra cell , but you can store it as additional attribute and get when necessary

<rows> 
  <row id='1'>  //<= 0 is reserved value
  <cell type="ra" myvalue='230202'>0</cell>

on client side 

var val=grid.cells(1,0).getAttribute("myvalue");