javascript - Using Jquery in UserControl with MasterPage -

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i can't seem javascript work on usercontrol. want count characters in mulitline textbox (which adds level of complexity). want count characters , display them in label.

i have javascript in .js file included in masterpage:

function textcounter(field, countfield, maxlimit) {     var output = document.getelementbyid(countfield);     if (output == null) { return; }      if (field.value.length > maxlimit)         field.value = field.value.substring(0, maxlimit);     else         output.value = maxlimit - field.value.length; }

my usercontrol has little code:

<script type="text/javascript" language="javascript">     if (typeof contentpageload == 'function') {         var outputfield = $("[id$='lblcharactercount']");     } </script>     <asp:textbox id="txtmytest" runat="server" height="75px" cssclass="form-field full" textmode="multiline" maxlength="140"             onkeyup="textcounter(this, outputfield, 140);" onkeydown="textcounter(this, outputfield, 140);" ></asp:textbox>  <asp:label id="lblcharactercount" runat="server"></asp:label>

outputfield null when tries execute function. i've tried adding it(the script on usercontrol) in scriptblock in usercontrol pageload, prerender , preinit. nothing seems work.

update:

i able usercontrol javascript working w/o updatepanel. problem, usercontrol in updatepanel. i've given on using usercontrol in updatepanel js unless can offer advice.

try changing selector this:

var outputfield = $("#<% lblcharactercount.clientid %>");

the id set on control not id gets assigned in html generated. using clientid property, html id.

of course haven't used asp.net in while answer might worthless.


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