Suppose a user entering records in fields and before save, changed the selected DropDownList suddenly there should be a message . Otherwise the values will be lose those are loaded under DropDownList selected index change event.I took a another textbox to hold the previous selected index value of DropDownList .(Also we can take HiddenField)
protected void
DDlPo_SelectedIndexChanged(object sender, EventArgs e)
{
DDlPo.Attributes.Add("onchange",
"return OnSelectedIndexChange();");
LoadMaterialBatchDetails();//this is load
method
}
<script language="javascript" type="text/javascript">
function OnSelectedIndexChange() {
var IndexValue =
document.getElementById('DDlPo');
var PreviousIndexValue =
document.getElementById('Txt PreviousIndexValue
').value;
if (IndexValue.selectedIndex !=
PreviousIndexValue) {
if
(confirm("Are you sure to select another Order
Number, Data will be loss for this Order Number?") == true) {
document.getElementById('BtnClose').click();
IndexValue.selectedIndex = IndexValue.selectedIndex;
}
else
{
IndexValue.selectedIndex = PreviousIndexValue;
}
}
}
</script>
