title: How to apply javascript on checkbox with value total?
body: <p>I try to print total value which is checked checkbox.
  It is already work with <code>input type="checkbox"&gt;</code>
  but It have made code with asp:checkbox/>.</p>
  
  <p>I try but it is print NaN.</p>
  
  <p>following code:
  four checkbox</p>
  
  <pre><code>&lt;asp:CheckBox runat="server" ID="CheckBox1" Text="Mobile" Value="70" onclick="checkcount(this);" /&gt;
  &lt;asp:Label ID="lbltotal" runat="server"   ClientIDMode="Static"&gt;&lt;/asp:Label&gt;
  int amount=0;
  function checkcount(item)
  {                      
        amount += parseInt(document.getElementById(item.id).value);
        alert(amount);
        document.getElementById("lbltotal").innerHTML = amount;
  }
  </code></pre>