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How do I write some client-side script to access a HTML element when .NET has generated the element’s ID at runtime?
At present I have this in my ASPX:
<asp:Content ContentPlaceHolderID="middle_area" runat="server">
<asp:Image ID="ImageBarChart" runat="server" />
</asp:Content>
<script>
var oImage = document.getElementById('ctl00_middle_area_ImageBarChart')
</script>
It it working at present, but I doubt it is reliable!
ClientID: Documentation
You would then do
<%= ImageBarChart.ClientID %>to put it in your javascript