How to attach onchange event to CheckBoxList? Missing InputAttributes?

Question

Setting onchange event for CheckBoxList using the following code doesn't work.

chkListUserGroup.Attributes.Add("onchange", "document.forms[0].isRecordModified.value='true';");

How to set onchange event for CheckBoxList?

Answer 1

Use onclick event,

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            CheckBoxList1.Items.Add("A");
            CheckBoxList1.Items.Add("B");
            CheckBoxList1.Items.Add("C");
            CheckBoxList1.Items.Add("D");

            foreach (ListItem item in CheckBoxList1.Items)
            {
                CheckBoxList1.Attributes.Add("onclick", "document.forms[0].isRecordModified.value=document.activeElement.checked");    
            }
        }
    }

Answer 2

Well actually it should be working. Because I write something in my code and it worked. It seems you need to check your javascript code by simply changing it with alert('hello');

 foreach (ListItem item in CheckBoxList1.Items)
 {
    item.Attributes.Add("onchange", "alert('hello')");
 }

This is my simple code and it is working.