.net – How to disable postback on an asp Button (System.Web.UI.WebControls.Button)

The Question :

137 people think this question is useful

I have an asp button. It’s server-side so I can only show it for logged in users, but i want it to run a javascript function and it seems when it’s runat=”server” it always calls the postback event.

I also have a regular button (<input...>) not running at server and it works fine…

How can I make this button only run the javascript and not postback?

The Question Comments :

The Answer 1

266 people think this answer is useful

Have your javascript return false when it’s done.

<asp:button runat="server".... OnClientClick="myfunction(); return false;" />

The Answer 2

39 people think this answer is useful
YourButton.Attributes.Add("onclick", "return false");


<asp:button runat="server" ... OnClientClick="return false" />

The Answer 3

16 people think this answer is useful

You can use jquery click action and use the preventDefault() function to avoid postback

<asp:button ID="btnMyButton" runat="server" Text="MyButton" />

$("#btnMyButton").click(function (e) {
// some actions here

The Answer 4

8 people think this answer is useful

Consider this.

<script type="text/javascript">
function BeginRequest(sender, e) {
    e.get_postBackElement().disabled = true;


The Answer 5

6 people think this answer is useful

The others are right that you need your callback to return false; however I’d like to add that doing it by setting the onclick is an ugly old way of doing things. I’d recommend reading about unobtrusive javascript. Using a library like jQuery could make your life easier, and the HTML less coupled to your javascript (and jQuery’s supported by Microsoft now!)

The Answer 6

4 people think this answer is useful

ASP.NET always generate asp:Button as an input type=submit.
If you want a button which doesn’t do a post, but need some control for the element on the server side, create a simple HTML input with attributes type=button and runat=server.

If you disable click actions doing OnClientClick=return false, it won’t do anything on click, unless you create a function like:

function btnClick() {
    // do stuff
    return false;

The Answer 7

3 people think this answer is useful

You don’t say which version of the .NET framework you are using.

If you are using v2.0 or greater you could use the OnClientClick property to execute a Javascript function when the button’s onclick event is raised.

All you have to do to prevent a server postback occuring is return false from the called JavaScript function.

The Answer 8

3 people think this answer is useful

additionally for accepted answer you can use UseSubmitBehavior=”false” MSDN

The Answer 9

3 people think this answer is useful

In my case, I solved adding return in the onClientClick:

Code Behind

function verify(){
  if (document.getElementById("idName").checked == "") {
    alert("Fill the field");
    return false;

Design Surface

<asp:Button runat="server" ID="send" Text="Send" onClientClick="return verify()" />

The Answer 10

2 people think this answer is useful

you can use the code:

<asp:Button ID="Button2" runat="server"

if nee submit

<form id="form1" runat="server" onsubmit="deshabilita()">
<script type="text/javascript">
    function deshabilita()
        var btn = "<%= Button1.ClientID %>";
        if (confirm("Confirme postback"))
            document.getElementById(btn).disabled = true;
            return true;
        return false;

The Answer 11

2 people think this answer is useful

With Validation

In this example I used two controls,ddl and txtbox, have a happy coding

 asp:ScriptManager ID="script1" runat="server" /asp:ScriptManager

    asp:UpdatePanel ID="Panel1" runat="server"

asp:Button ID="btnSave" runat="server" Text="Save" class="btn btn-success" OnClientClick="return Valid()" OnClick="btnSave_Click"


  <script type="text/javascript">
        function Valid() {

            if ($("#ctl00_ContentPlaceHolder1_YOUR CONTROL NAME").val() == 0) {
                alert("Please select YOUR TEXT");
                $("#ctl00_ContentPlaceHolder1_YOUR CONTROL NAME").focus();
                return false;

            if ($("#ctl00_ContentPlaceHolder1_YOUR CONTROL NAME").val().length == 0) {
                alert("Please Type YOUR TEXT");
                $("ctl00_ContentPlaceHolder1_YOUR CONTROL NAME").focus();
                return false;
            return true;

The Answer 12

2 people think this answer is useful

You can use JQuery for this

<asp:Button runat="server" ID="btnID" />

than in JQuery


The Answer 13

1 people think this answer is useful

You just need to return false from the

function jsFunction() {
  try {
    // Logic goes here
    return false; // true for postback and false for not postback
  } catch (e) {
    return false;
<asp:button runat="server" id="btnSubmit" OnClientClick="return jsFunction()" />

JavaScript function like below.

Note*: Always use try-catch blocks and return false from catch block to prevent incorrect calculation in javaScript function.

Add a Comment