How to disable Ctrl+U using Javascript

user_2693465 0
Viewed 61989

I just want to disable Ctrl+U and Ctrl+C event. The primary purpose of doing this is, preventing users from downloading any image or copying content from my website easily i.e. pressing Ctrl+U for viewing my webpage's source code or pressing Ctrl+C for copying content directly from my webpage.

Currently, I am using this piece of code but it disables my entire keyboard

 <script>
    /*function check(e)
    {
    alert(e.keyCode);
    }*/
    document.onkeydown = function(e) {
            if (e.ctrlKey && (e.keyCode === 67 || e.keyCode === 86 || e.keyCode === 85 || e.keyCode === 117)) {//Alt+c, Alt+v will also be disabled sadly.
                alert('not allowed');
            }
            return false;
    };
    </script>
jquery javascript
8 Answers

Your problem is the return statement.

Though I would suggest you use addEventListener and the like, this is a working copy of your code:

document.onkeydown = function(e) {
        if (e.ctrlKey && 
            (e.keyCode === 67 || 
             e.keyCode === 86 || 
             e.keyCode === 85 || 
             e.keyCode === 117)) {
            alert('not allowed');
            return false;
        } else {
            return true;
        }
};
user_21482450

This is finally what I got to disable Ctrl+U:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>
document.onkeydown = function(e) {
        if (e.ctrlKey && 
            (e.keyCode === 67 || 
             e.keyCode === 86 || 
             e.keyCode === 85 || 
             e.keyCode === 117)) {
            return false;
        } else {
            return true;
        }
};
$(document).keypress("u",function(e) {
  if(e.ctrlKey)
  {
return false;
}
else
{
return true;
}
});
</script>
user_26934650

try check this link from jsfiddle.

js 

shortcut.add("Ctrl+U",function(){
     alert('Sorry\nNo CTRL+U is allowed. Be creative!')
    }),

it will simple show and error when you try to hit Ctrl+U on your keybord

But check the link, there is alot of code

user_29432180

This will Disable Ctrl + U and Right-click (make sure it's at the top of all your code) :

<!-- Disable CTRL U and Right Click -->
<script>
  document.onkeydown = function(e) {
    if (e.ctrlKey && e.keyCode === 85) {
      return false;
    }
  };
</script>
<body oncontextmenu="return false;"></body>

<!-- disable CTRL U and Right Click -->
user_144435060

To disable right click

document.addEventListener('contextmenu', event => event.preventDefault());

To disable F12 options

document.onkeypress = function (event) {
event = (event || window.event);
if (event.keyCode == 123) {
return false;
}
}

document.onmousedown = function (event) {
event = (event || window.event);
if (event.keyCode == 123) {
return false;
}
}
document.onkeydown = function (event) {
event = (event || window.event);
if (event.keyCode == 123) {
return false;
}
}

To Disable ctrl+c, ctrl+u

jQuery(document).ready(function($){
$(document).keydown(function(event) {
var pressedKey = String.fromCharCode(event.keyCode).toLowerCase();

if (event.ctrlKey && (pressedKey == "c" || pressedKey == "u")) {
alert('Sorry, This Functionality Has Been Disabled!');
//disable key press porcessing
return false;
}
});
});
user_131078090

you can use the below script

<script>
/*function check(e)
{
alert(e.keyCode);
}*/
 document.onkeydown = function(e) {
    if (e.ctrlKey && (e.keyCode === 67 || e.keyCode === 86 || e.keyCode === 85 ||     e.keyCode === 117 || e.keycode === 17 || e.keycode === 85)) {//ctrl+u Alt+c, Alt+v will also be disabled sadly.
        alert('not allowed');
    }
    return false;
};
</script>
user_7872200
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