Discovering Ways to Utilize User Controls with JavaScript

How do I manipulate my user control using JavaScript?

<body>
    <form id="form1" runat="server">
    <div>
        <uc1:WebUserControl ID="WebUserControl1" runat="server" Enabled="False" />
        <input id="Button1" type="button" value="button" runat="server" onclick="return Button1_onclick()" /></div>
    </form>

    <script type="text/javascript">
        var handleUserControl = {
            uc: document.getElementById("<%=WebUserControl1.ClientID%>"),
            btn1: document.getElementById("<%=Button1.ClientID%%gt;"),
            init: function() {
                this.btn1.onclick = function() {
                    uc.setAttribute('Enabled', 'True'); //uc is null at this point
                };
            }
        }
        handleUserControl.init();
    </script>

</body>

Answer №1

If you wish to reference the ClientID in the same manner as demonstrated, the JavaScript code must be placed within the UserControl rather than on the page itself. Alternatively, if you prefer to keep the code as is, you will need to declare the clientId as a public property in your user control:

public string userCtlClientId
{
  get{return userCtl.ClientId;} 
}

Following this, adjust your script accordingly:

document.getElementById('<% =WebUserControl1.userCtlClientId%>');

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