asp.net - Find out client-side ID of HTML element created by .NET? -

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how write client-side script access html element when .net has generated element's id @ runtime?

at present have in 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 working @ present, doubt reliable!

clientid: documentation

you <%= imagebarchart.clientid %> put in javascript


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