List Box and Combo Box for ASP.NET Web Forms - How to enable or disable items

This example demonstrates how to use CSS classes to enable or disable items in editors.

Overview

Create a custom CSS class and set the pointer-events property to none. To assign this CSS class to an item, call an editor's client-side AddItemCssClass method.

.disabled {
    pointer-events: none;
    color: silver;
}

function enableItems(editor, enable) {
    for (i = 0; i < editor.GetItemCount(); i++) {
        if (editor.GetItem(i).value % 2 == 0)//Your custom codition
            if (enable)
                editor.RemoveItemCssClass(i, 'disabled');//Enable an item
            else
                editor.AddItemCssClass(i, 'disabled'); //Disable an item
    }
}

Files to Look At

• Default.aspx (VB: Default.aspx)
• Default.aspx.cs (VB: Default.aspx.vb)

Documentation

• ClientComboBox.AddItemCssClass
• ClientComboBox.RemoveItemCssClass
• ClientListBox.AddItemCssClass
• ClientListBox.RemoveItemCssClass

More Examples

• Combo Box for ASP.NET Web Forms - How to customize an item's appearance

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