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

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How to disable postback on an asp Button (System.Web.UI.WebControls.Button) – Even if we have a good project plan and a logical concept, we will spend the majority of our time correcting errors abaout .net and Furthermore, our application can run without obvious errors with JavaScript, we must use various ways to ensure that everything is operating properly. In general, there are two types of errors that you’ll encounter while doing something wrong in code: Syntax Errors and Logic Errors. To make bug fixing easier, every JavaScript error is captured with a full stack trace and the specific line of source code marked. To assist you in resolving the JavaScript error, look at the discuss below to fix problem about How to disable postback on an asp Button (System.Web.UI.WebControls.Button).

Problem :

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?

Solution :

Have your javascript return false when it’s done.

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

YourButton.Attributes.Add("onclick", "return false");


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

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

Consider this.

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


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!)

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;

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.

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

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

Code Behind

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

Design Surface

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

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;

 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;

You can use JQuery for this

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

than in JQuery


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.

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