Linkbutton onclick not firing after onclientclick completion

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VB

ASP.NET

Javascript

I have a linkbutton inside a gridview. when I click on it onclientclick has some validation if we get true onclick has to perform else not perform. But here onclick is not firing.

What I have tried:

Aspx page:
<asp:TemplateColumn HeaderText="Assign Source Locations" HeaderStyle-CssClass="ReportDataHeader">
<itemtemplate>
<asp:LinkButton CssClass="SearchLabel" ID="lnkbtnAssignLoc" runat="server" Text="Assign Locations" UseSubmitBehavior="false" CausesValidation="false" OnClientClick="return ToggleEnable(this);">




Javascript:

function ToggleEnable(src) {
var row = src.parentNode.parentNode;
var rowIndex = row.rowIndex - 1;
var element = row.cells[3].getElementsByTagName("select");
var ddlSelectedValue = element[0].options[element[0].selectedIndex].text;
var SourceLocations = row.cells[4].innerHTML;

if (ddlSelectedValue == "Par Locations") {
return true;
}
else {
document.getElementById("lnkbtnAssignLoc").disabled = true;
return false;
}
}

Code behind:


lnkbtnLoc.Attributes.Add("OnClick", _
"return showDocumentPopup('mt_pou_assign_process_locations.aspx?qStrOrgGrpID=" & _deviceTokenEntry(TokenEntry_Enum.OrgGrpID) & "&qstrLocGrpId=" & e.Item.Cells(2).Text & "&qstrOrgID=" & ddlOrgId.SelectedValue & "&qstrSourceLocations=" & e.Item.Cells(5).Text & "');")

Above OnClick is not firing.
Please suggest me how to proceed