javascript - LinkButton.Text coming undefined in js -

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i want configure hyperlink close/open related div in asp.net. basically, when user clicks sign x, panel should closed , sign + should appeared. when + clicked, panel should showed again. not manage , believe main problem "document.getelementbyid('<%= lb_closepanel.clientid %>').value" coming undefined. here code until now. appreciate helps!

<!doctype html> .... <div class="appheader">     <h1 class="appheadercontent">search client</h1>     <div id="checkbox"></div>         <div id="closepanel"><h2 id="lblclosepanel">close panel</h2>             <div id="xbutton">                 <asp:linkbutton onclientclick="closeopenpanel('search')" runat="server" text="x" style="text-decoration:none; color:white" id="lb_closepanel"></asp:linkbutton>             </div>         </div> </div> <div class="app" id="search"> ... <div> ... </html>  <script type="text/javascript">     function closeopenpanel(obj) {               alert(document.getelementbyid('<%= lb_closepanel.clientid %>').value); //here comes undefined!!!!         if (document.getelementbyid('<%= lb_closepanel.clientid %>').value == 'x') {             document.getelementbyid(obj).visible = false;             lb_closepanel.text = '+';         }         else {             document.getelementbyid(obj).visible = true;             lb_closepanel.text = 'x';         }     } </script>

your code ok, instead of property value use innerhtml

 alert(document.getelementbyid('<%= lb_closepanel.clientid %>').innerhtml);

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