How to disable alt key codes in textbox?

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Hi, All.

Please help me. I need to disable alt + key codes in the textbox to restrict some special characters like %.

Thank you!

Posted 1-Nov-15 15:07pm

Janna Dela Cruz

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Sergey Alexandrovich Kryukov 2-Nov-15 1:40am

Special characters? Never heard of any. How % is special? How is it related to Alt+Key? I don't think the question makes any sense, but if it does, please clarify.
—SA

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Abhinav S · Answer 1 · 2015-11-01T16:03:00

Solution 1

C#

$('selector').keypress(function(e) {
  console.log(e.shiftKey);
  if ((.altKey) {
    e.preventDefault();
    alert('Disallowed');
  }
});

Posted 1-Nov-15 16:03pm

Abhinav S

Comments

Sergey Alexandrovich Kryukov 2-Nov-15 1:43am

It's "e.altKey". Basically, you are right, but what action on an input control will it prevent? The inquirer did not explain it.
—SA

Krunal Rohit · Answer 2 · 2015-11-01T17:33:00

Solution 2

You just need to disable only the alt key, rest is a combination to perform specific operation:

JavaScript

$(".txt").keypress(function(e) {
    if(e.altKey){
        return false;  // or e.preventDefault();
    }
});

-KR

Posted 1-Nov-15 17:33pm

Krunal Rohit

Comments

Sergey Alexandrovich Kryukov 2-Nov-15 1:44am

You are perfectly right, but what action on an input control will it prevent? The inquirer did not explain it.
—SA

Deivendran Deva · Answer 3 · 2015-11-01T19:36:00

XML

<script language="javascript" type="text/javascript">
function getKeyCodeEvent(ev) {
 var code = (document.all) ? event.keyCode:ev.which;
 var alt = (document.all) ? event.altKey:ev.modifiers & Event.ALT_MASK;
if (document.all)
        {
        if (alt && code==115) //Example ALT+F4
        {
          try{
            //your requirements
            }catch(e){
          }
        }
        }

}
</script>

How to disable alt key codes in textbox?

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