Question

I want call OnClick function on page load with out user clicking. Can we do that in jQuery or javascript?

     <input name="ctl00$PlaceHolderMain$ButtonSection$RptControls$BtnSubmit" 
        class="ms-ButtonHeightWidth" 
        id="ctl00_PlaceHolderMain_ButtonSection_RptControls_BtnSubmit" 
        accessKey="o" onclick="javascript:WebForm_DoPostBackWithOptions(new 
        WebForm_PostBackOptions("ctl00$PlaceHolderMain
                                $ButtonSection$RptControls$BtnSubmit", 
                                "", true, "", "", false, true))" 
        type="button" value="OK"/>

Answer 1

$(document).ready(function() {
    $("#ctl00_PlaceHolderMain_ButtonSection_RptControls_BtnSubmit").click();
});

This will trigger the click event on the element with the supplied id, and it will run when the document is fully loaded.