Sample: dhtmlxToolbar Button State dhtmlxToolbar main page
X
 
<script>
 
    var webBar = new dhtmlXToolbarObject("toolbarObj");
    ...
    // enabling a button
    webBar.enableItem(itemId);
    // disabling a button
    webBar.disableItem(itemId);
    // is a button enabled
    var isEnabled = webBar.isEnabled(itemId);
</script>