asp.net - Check if ASPX checkbox is checked with javascript -


how can check if checkbox checked or not on page load javascript? none of codes worked:

<asp:checkbox runat="server" id="chkemailconsent" checked='<%# bool.parse(eval("emailconsent").tostring()) %>' enabled="false" />   document.getelementbyid("<%= chkemailconsent.clientid %>")  document.getelementbyid("ctl00_cphglobalcontent_formview1_chkemailconsentid")

i using same name controls both server , client side add clientidmode="static". way not have use <%= stuff control name.

<asp:checkbox runat="server" clientidmode="static" id="chkemailconsent" checked='<%# bool.parse(eval("emailconsent").tostring()) %>' enabled="false" />   <script>          // note, works because check value after control.         // otherwise need in function or          alert(document.getelementbyid("chkemailconsent").checked)  </script>

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