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

Answer 2

Use this code to handle the events of click in Check box list in vb.net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            Dim li As ListItem
            For Each li In CheckboxList1.Items
                li.Attributes.Add("onclick", "alert('hello')")
            Next
        End If

Answer 3

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.