html - Why JQuery is not updating the hidden field -


i have divs inside updatepanel:

<asp:updatepanel runat="server" id="upadddays" updatemode="conditional">     <contenttemplate>         <div class="adddayssection">             <div class="leftdiv2">task name: </div>             <div class="rightdiv2" style="overflow: hidden;">                 <asp:label id="lbltname" runat="server" text="" clientidmode="static"></asp:label>             </div>         </div>         <div class="adddayssection">             <div class="leftdiv2">current due date: </div>             <div class="rightdiv2">                 <asp:label id="lblcurrdd" runat="server" text="" clientidmode="static"></asp:label>             </div>         </div>         <div class="adddayssection" style="padding: 10px 0 10px 0; height: 45px;">             <div class="leftdiv2">add days extend: </div>             <div class="rightdiv2">                 <div style="float: left; text-align: right; padding-right: 5%; height: 100%;">                     <span style="display: inline-block; height: 100%; vertical-align: middle;"></span>                     <img id="imgminus" src="../theimages/adddaysminus_off.png" style="vertical-align: middle; width: 35px; height: 35px; display: none;" />                 </div>                 <div style="float: left; text-align: center;">                     <span style="display: inline-block; height: 100%; vertical-align: middle;"></span>                     <input type="text" value="0" id="txtextend" maxlength="3" placeholder="number of days" size="3" class="txtextend" />                 </div>                 <div style="float: left; text-align: left; padding-left: 5%; height: 100%;">                     <span style="display: inline-block; height: 100%; vertical-align: middle;"></span>                     <img id="imgplus" src="../theimages/adddaysplus_off.png" style="vertical-align: middle; width: 35px; height: 35px;" />                 </div>             </div>         </div>         <div class="adddayssection">             <div class="leftdiv2">new due date: </div>             <div class="rightdiv2">                 <asp:label id="lblnewdd" runat="server" text="" clientidmode="static"></asp:label>             </div>         </div>     </contenttemplate> </asp:updatepanel>

and hidden field somewhere else on page, outside of updatepanel:

<input type="hidden" id="newdd" name="newdd" runat="server" />

javascript:

$("body").on('click', "#imgplus", function (e) {     //alert("plus");     var vdays = $("#txtextend").val();     $("#txtextend").val(parseint(vdays) + 1);     vdays = $("#txtextend").val();     if (vdays > 0) {         $("#imgminus").show();     }     else {         $("#imgminus").hide();     }     var date = new date($("#lblcurrdd").text());     var days = parseint($("#txtextend").val(), 10);      if (!isnan(date.gettime())) {         date.setdate(date.getdate() + days);          $("#lblnewdd").text(date.toinputformat());         alert($("#lblnewdd").text()); //displays: date         $("#newdd").val($("#lblnewdd").text());         alert($("#newdd").val()); //displays: undefined     }     else {         alert("invalid date");     } });  $("body").on('click', "#imgminus", function (e) {     //alert("minus");     var vdays = $("#txtextend").val();     if (vdays > 0) {         $("#txtextend").val(parseint(vdays) - 1);     }     var vdays = $("#txtextend").val();     if (vdays <= 0) {         $("#imgminus").hide();     }     else {         $("#imgminus").show();     }     var date = new date($("#lblcurrdd").text());     var days = parseint($("#txtextend").val(), 10);      if (!isnan(date.gettime())) {         date.setdate(date.getdate() - days);          $("#lblnewdd").text(date.toinputformat());         alert($("#lblnewdd").text()); //displays: date         $("#newdd").val($("#lblnewdd").text());         alert($("#newdd").val()); //displays: undefined     }     else {         alert("invalid date");     } });

why isn't hidden value being updated date , displays undefined instead?

because when set element runat="server", asp.net changes id, sou you'd have reference generated id of element through .clientid property:

$("#<%=newdd.clientid %>").val()

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