javascript - Getting null value of the hidden field at server-side -


i calling java-script function, in passing value of hidden field, hidden field want use @ server-side, value of hidden field null.

client side function

function getdetails()     {         document.forms[0].hdnnode.value=tree_selected_id; //html hidden field.         str="cmp_12";         str_array=str.split("_");         var str_array1=str_array[0];         var str_array2=str_array[1];         document.getelementbyid("<%=hiddennodeid.clientid %>").value=str_array1;         document.getelementbyid("<%=hiddentreeid.clientid %>").value=str_array2;                            }

server side function

public sub insertnodes(byval nodeid string)     dim objerrorobj new errorobj     dim parentid string     parentid = hiddennodeparent.value     nodeid = hiddennodeid.value     dim nodeidtree string     nodeidtree = hiddentreeid.value end sub

i using hidden fields updatepanels ( hidden field must send server use in partial postback ) , can try set enableviewstate = true ( whole page post ).

aspx:

        <asp:updatepanel id="updatepanel1" runat="server" onload="updatepanel1_load" updatemode="conditional" childrenastriggers="true">         <contenttemplate>             <asp:hiddenfield runat="server" id="linesback" value="0"/>         <asp:updateprogress id="updateprogress1" runat="server" displayafter="10" associatedupdatepanelid="updatepanel1">                 <progresstemplate>                     <img id="spinner" alt="spinner" src="../pictures/spinner_30x30.gif" />                 </progresstemplate>             </asp:updateprogress>             <div id="back" class="newresultpanel" runat="server" ></div>         </contenttemplate>     </asp:updatepanel>

html:

var = document.getelementbyid('<%= linesback.clientid %>').value;

cs:

            linesback.value = countrows.tostring();

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