To prevent pressing of Delete and backspace keys

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Hi All,

I've a textbox in my web form which opens a popup at click event. I want to prevent users to type any thing and also from using delete and backspace button. I've blocked typing other keys except Delete and backspace. How Can I prevent keypressing of Delete and Backspace?

Posted 22-Jun-10 19:49pm

jisha Johnson

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Abhinav S · Answer 1 · 2010-06-22T20:17:00

Solution 2

Try this -

onkeydown="return isNumberKey(event,this)"

C#

function isNumberKey(evt, obj)
{
    var charCode = (evt.which) ? evt.which : evt.keyCode
    if (charCode == 8 || charCode == 46) return false;
    return true;
}

Posted 22-Jun-10 20:17pm

Abhinav S

Updated 28-Jun-10 1:57am

v2

Ronak Bhavsar · Answer 2 · 2010-06-22T20:13:00

Solution 1

You can add following java script function for your text box

C#

function onkeyup(e) {
    var code;
    if (!e) var e = window.event;
    if (e.keyCode) code = e.keyCode;
    else if (e.which) code = e.which;
    if (keycode == 8 || keycode == 46)
        return false;
}

Posted 22-Jun-10 20:13pm

Ronak Bhavsar

Graham Breach · Answer 3 · 2010-06-28T12:44:00

Solution 5

If you want to prevent all input to the textarea, you can set the readonly attribute in the HTML.

If you only want to disable it during the popup, set the textarea element's readOnly member to true at the start of the popup, and reset it to false afterwards.

Posted 28-Jun-10 12:44pm

Graham Breach

Chris Maunder · Answer 4 · 2010-07-02T15:08:00

Solution 6

As others have said, "return false" in your click handler will do it, but take a look at this article[^]. Learn about the event.preventDefault() and event.stopPropagation methods. They are your friend.

Posted 2-Jul-10 15:08pm

Chris Maunder772.8K

Updated 2-Jul-10 15:09pm

v2

Comments

Ankur^\m/ 3-Jul-10 2:46am

That was very informative. Thanks for posting the link.
Cheers!

PS: I mistakenly posted the comment to the wrong answer. Deleted it! :P