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//全选操作js
function checkAll(obj,name) {
var names = document.getElementsByName(name);
var len = names.length;
if (len > 0) {
for (var i = 0; i < len; i++)
names[i].checked = obj.checked;
}
}
<dx:GridViewDataColumn VisibleIndex="0" meta:resourcekey="GridViewDataColumnResource1">
<HeaderTemplate>
<input id="chkCheckAll" onclick="checkAll(this,'chkID')" type="checkbox" />
</HeaderTemplate>
<EditFormSettings Visible="False" />
<DataItemTemplate>
<input name="chkID" type="checkbox" value='<%# Eval("Id") %>' />
</DataItemTemplate>
</dx:GridViewDataColumn>