asp.net dropdownlist selectedindexchanged event in javascript Example

How to handle the asp.net dropdownlist selectedindexchanged event in javascript .Here I will explain how to raise dropdownlist selectedindexchanged event in JavaScript using asp.net.Asp.net Dropdownlist Selectedindexchanged Event in JavaScript.

Generally we will use onchange event of Dropdownlist in asp.net  to raise dropdownlist selectedindexchanged event in JavaScript like as shown below


<asp:DropDownList runat="server" ID="ddlID" onchange="JavaScript: onSelectChange ();">
    </asp:DropDownList>

<script>
 function onSelectChange()
 {
 alert("hello !");
 }
</script>

You can also add Javascript function on dropdownlist onchange event from  code behind page file as follows.Just add bellowcode on Page_Load Event of Page.

ddlID.Attributes.Add("onChange", "return onSelectChange ();");
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