When activated, JavaScript is producing an undefined response

This is a function with the following designer code. I have made updates to include the latest answer.

function OnClientLoBChecked(sender, args) {

    var ChkBoxLOB = document.getElementById("<%= cbFLoB.ClientID %>");
    var ChkBoxDis = document.getElementById("<%= chkBoxShowNewProjects.ClientID %>");  
    if (ChkBoxLOB.Checked) {
        ChkBoxDis.checked = false;
    } else {
        ChkBoxDis.checked = true;
    }
    filterChanged();
} 

<telerik:radcombobox id="cbFLob" runat="server" datatextfield="LobName" checkboxes="true" OnClientItemChecked="OnClientItemChecked">
javascriptasp.netvb.net

Answer №1

Your code contains an error with the incorrectly capitalized document.getElementById(). However, the main issue is that ChkBoxLob will always be undefined.

Instead of using $find, which is an ASP.net function for locating components registered with addComponent method.

The components in question are .net AJAX server controls with a corresponding JavaScript counterpart. It's important to note that the $find() method should not be used like traditional JavaScript methods such as document.getElementById() or jQuery's $('#someId).

This is why chkBoxLob always remains undefined;

It would be more appropriate to use document.getElementById in both instances.

var ChkBoxLob = document.getElementById("<%= cbFLob.ClientID %>");
var ChkBoxDis = document.getElementById("<%= chBoxNewProjects.ClientID %>");

Take note of the proper capitalization for the .ClientID property as well.

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