ASP.Net page enter key causing post back

I have an aspx page that postsback when it should not. there are two text boxes, two listboxes and two buttons on the page. if at any-point the enter key is pressed the first button is given focus and “clicked” resulting in a loss of selection within the listboxes.

How do I disable this? There are tons of tutorials on how to capture the enter button and execute a method but I could not find one on how to simply disable the neat “let me grab the first button I find and click it” feature mentioned above.


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Method 1

  • You could set the DefaultButton on the Form or a Panel. This way you have full control what happens.
  • Set UseSubmitBehavior=”False” on your Buttons. This disables the “AutoPostback” on Enter.

I would prefer the second if i wanted to prevent Postbacks on Enter completely.

Method 2

are you using jQuery?

if so:

    if(e.keyCode === 13)
        return false;

Method 3

Use the below code to disable enter key causing postback. This piece of code will block the enter key in all browsers 4.0 above, except when enter is pressed in a Textarea or on the Submit button itself.

<script language="JavaScript">
var nav = window.Event ? true : false;
if (nav) {
window.onkeydown = NetscapeEventHandler_KeyDown;
} else {
document.onkeydown = MicrosoftEventHandler_KeyDown;

function NetscapeEventHandler_KeyDown(e) {
if (e.which == 13 && != 'textarea' && != 'submit') { 
return false; 
return true;

function MicrosoftEventHandler_KeyDown() {
if (event.keyCode == 13 && event.srcElement.type != 'textarea' && 
event.srcElement.type!= 'submit')
return false;
return true;

Method 4

Only put this on you ASP.Net TextBox control:

<asp:TextBox ID="TextBox1" runat="server"
   onkeydown = "return (event.keyCode!=13);" >

Method 5

This is default behavior of a web application, you could take one of the tutorials that you found and hide that behavior, by simply abandoning the submit.

Method 6

<body onkeydown = "return (event.keyCode!=13)">

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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