Onkeypress javascript not working in tab panel

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i have texbox inside tab panel and i want to count enter characters in textbox onkeypress. but javascript not working when textbox are inside the tab panel.

What I have tried:

here is my code:

  <script type="text/javascript">
function countChars(countfrom,displayto) {
  var len = document.getElementById(countfrom).value.length;
  document.getElementById(displayto).innerHTML = len;
}
    </script>

<ajax:TabContainer ID="TabContainer1" runat="server" CssClass="ajax__tab_red-theme"
                   Width="100%" ActiveTabIndex="0">
                   <ajax:TabPanel ID="tbpnlPhotos" runat="server">
                       <HeaderTemplate>
                           class="fa fa-comment"> Student
                       </HeaderTemplate>
                       <ContentTemplate>

  <table width="100%">
                            <tr>
                       <td align="right" style="font-size: small">
                           <span id="charcount" style="color:red">0</span> characters entered.
                       </td>
                       </tr>
                           <tr>
                           <td align="center">
                             <asp:TextBox ID="txtMessage" onkeyup="countChars('txtMessage','charcount');" onkeydown="countChars('txtMessage','charcount');"
                               onmouseout="countChars('txtMessage','charcount');" runat="server" Width="95%"
                               placeholder="Message........" TextMode="MultiLine" Height="220px" MaxLength="2"
                               BorderColor="Blue"></asp:TextBox>
                           </td>
                           </tr>
                           </table>

                           <br />
                           <br />
                       </ContentTemplate>
                   </ajax:TabPanel>
  </ajax:TabContainer>

Posted 6-Nov-17 22:32pm

TCS54321

Updated 6-Nov-17 22:46pm

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Comments

Karthik_Mahalingam 7-Nov-17 4:43am

are you getting any error in console window?

TCS54321 7-Nov-17 4:46am

no.. if i paste textbox outside the TabContainer then its working fine but not inside.

Karthik_Mahalingam 7-Nov-17 4:47am

check the solution.

TCS54321 7-Nov-17 4:50am

its working. thank you karthik.

Karthik_Mahalingam 7-Nov-17 4:51am

welcome.

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Karthik_Mahalingam · Accepted Answer · 2017-11-06T22:46:00

try

<span id="charcount" style="color:red">0</span> characters entered.
      <asp:TextBox ID="txtMessage" onkeyup="countChars();" onkeydown="countChars();"
                             onmouseout="countChars();" runat="server" Width="95%"
                             placeholder="Message........" TextMode="MultiLine" Height="220px" MaxLength="2"
                             BorderColor="Blue"></asp:TextBox>

function countChars() {
          var textBoxClientID = '<%= txtMessage.ClientID%>'
          var len = document.getElementById(textBoxClientID).value.length;
          document.getElementById('charcount').innerHTML = len;
      }