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How to disable View source and inspect element

How do you disable/ view source/ and /inspect element/, ctrl + u ctrl+shift+I f12 menu bar and right click, also ctrl + s ctrl p ctrl+v ctrl+a ctrl+c and drag select page, please answer all parts that's possible, I prefer to do this will JavaScript array keycodes or html no php or other languages.also I want to block ifram use on my site like somesites such as google.
As I understand it is not possible to completely disable view source and inspect element, so I want minification of code and rest of my question answered instead.
Edit:
I solved alot of it myself, I used onkeydown return false to disable all keys, still need the arrays, I disabled inspect element menu bar by forcing browser to window.open I still need right click, however would like to add that I need a custom right click menu, I disabled the possibility to disable Javascript in order to stop the key block by using noscript function redirects. I also still need the drag and select part. I would still like betterways to fix it...maybe even just minify the code or encrypt it. Of anyone needs some of the code I used just reply. I just need to fix it.

It is not possible to prevent the user from inspecting code running on their machine. At the end of the day the HTMl they are getting delivered will be readable in plain text. You can cause a nuisance for most people, but this will not be a valid security measure - chrome extensions will still run, for instance, so if someone is using the NoScript extension it will disable all javascript.
A much better option would be to handle your logic serverside, and only send the client the information they need to know/requested.
There are some free javascript obfuscators, such as https://javascriptobfuscator.com/. Please remember that it is not a secure method, though.

I mean no matter how much you block it a person can just type
view-source:https://example.com

document.onkeydown = function(e)
{
if(event.keyCode == 123)
{
return false;
}
if(e.ctrlKey && e.shiftKey && e.keyCode == 'I'.charCodeAt(0))
{
return false;
}
if(e.ctrlKey && e.shiftKey && e.keyCode == 'J'.charCodeAt(0))
{
return false;
}
if(e.ctrlKey && e.keyCode == 'U'.charCodeAt(0))
{
return false;
}
if(e.ctrlKey && e.shiftKey && e.keyCode == 'C'.charCodeAt(0))
{
return false;
}
}
e is a keyboard event. e.[key] returnes true if key pressed.
If document.onkeydown returns false, key doesn't count.
This programm seeing if code view combination pressed and returning false.
Example. if ctrl, shift and 'J' pressed - return false.

Bump
To the people saying it isn't possible, how would you recon this website managed to do so?
The following website disabled, view source, right click and the dev console.
I am genuinely interested.
https://www.techgyd.com/contact-facebook-directly/6579/
Edit:
all input from keyboard is disabled, but by adding "view-source:" before the httpps:// to the url to become:
view-source:https://www.techgyd.com/contact-facebook-directly/6579/
makes me able to see.
If you would like to know how they did that then take a look at their JS, raw copy/paste:
<script type="text/javascript">
//<![CDATA[
var show_msg = '';
if (show_msg !== '0') {
var options = {view_src: "View Source is disabled!", inspect_elem: "Inspect Element is disabled!", right_click: "Right click is disabled!", copy_cut_paste_content: "Cut/Copy/Paste is disabled!", image_drop: "Image Drag-n-Drop is disabled!" }
} else {
var options = '';
}
function nocontextmenu(e) { return false; }
document.oncontextmenu = nocontextmenu;
document.ondragstart = function() { return false;}
document.onmousedown = function (event) {
event = (event || window.event);
if (event.keyCode === 123) {
if (show_msg !== '0') {show_toast('inspect_elem');}
return false;
}
}
document.onkeydown = function (event) {
event = (event || window.event);
//alert(event.keyCode); return false;
if (event.keyCode === 123 ||
event.ctrlKey && event.shiftKey && event.keyCode === 73 ||
event.ctrlKey && event.shiftKey && event.keyCode === 75) {
if (show_msg !== '0') {show_toast('inspect_elem');}
return false;
}
if (event.ctrlKey && event.keyCode === 85) {
if (show_msg !== '0') {show_toast('view_src');}
return false;
}
}
function addMultiEventListener(element, eventNames, listener) {
var events = eventNames.split(' ');
for (var i = 0, iLen = events.length; i < iLen; i++) {
element.addEventListener(events[i], function (e) {
e.preventDefault();
if (show_msg !== '0') {
show_toast(listener);
}
});
}
}
addMultiEventListener(document, 'contextmenu', 'right_click');
addMultiEventListener(document, 'cut copy paste print', 'copy_cut_paste_content');
addMultiEventListener(document, 'drag drop', 'image_drop');
function show_toast(text) {
var x = document.getElementById("amm_drcfw_toast_msg");
x.innerHTML = eval('options.' + text);
x.className = "show";
setTimeout(function () {
x.className = x.className.replace("show", "")
}, 3000);
}
//]]>
</script>
or just look from line 86
I hope it helps

How to Disable the CTRL+P using javascript or Jquery?

Here I tried to disable the Ctrl+P but it doesn't get me alert and also it shows the print options
jQuery(document).bind("keyup keydown", function(e){
if(e.ctrlKey && e.keyCode == 80){
alert('fine');
return false;
}
});
http://jsfiddle.net/qaapD/10/
I am not sure how can I disable the Ctrl+P combination itself using jQuery or JavaScript.
Thanks

You can't prevent the user from printing, but you can hide everything when the user prints the document by using simple CSS:
<style type="text/css" media="print">
* { display: none; }
</style>
Updated fiddle.
If you would like to show the visitor a custom message when he/she try to print rather then just a blank page, it's possible with client side code but first wrap all your existing contents like this:
<div id="AllContent">
<!-- all content here -->
</div>
And add such a container with the custom message:
<div class="PrintMessage">You are not authorized to print this document</div>
Now get rid of the <style type="text/css" media="print"> block and the code would be:
if ('matchMedia' in window) {
// Chrome, Firefox, and IE 10 support mediaMatch listeners
window.matchMedia('print').addListener(function(media) {
if (media.matches) {
beforePrint();
} else {
// Fires immediately, so wait for the first mouse movement
$(document).one('mouseover', afterPrint);
}
});
} else {
// IE and Firefox fire before/after events
$(window).on('beforeprint', beforePrint);
$(window).on('afterprint', afterPrint);
}
function beforePrint() {
$("#AllContent").hide();
$(".PrintMessage").show();
}
function afterPrint() {
$(".PrintMessage").hide();
$("#AllContent").show();
}
Code is adopted from this excellent answer.
Updated fiddle. (showing message when printing)

After much testings on various browsers, it is easier to intercept the keys when they are down (not pressed) because some of this "App integrated keys" are difficult to intercept with the "keypress" event.
I came up with this script that is sort of cross browser compatible (I didn't test for Microsoft's IE). Notice that the browsers return different codes for some keys. In my case I wanted to prevent Ctrl+P.
The key "P" on chrome is seen as e.keyCode == 80, on opera, it is e.charCode == 16, while on firefox it is e.charCode == 112
$(document).on('keydown', function(e) {
if((e.ctrlKey || e.metaKey) && (e.key == "p" || e.charCode == 16 || e.charCode == 112 || e.keyCode == 80) ){
alert("Please use the Print PDF button below for a better rendering on the document");
e.cancelBubble = true;
e.preventDefault();
e.stopImmediatePropagation();
}
});
I used jQuery.

This is basically Peters answer from above. The difference is I added the accountability for mac when pressing the cmd+p button combo to print a page.
$(document).on('keydown', function(e) {
if((e.ctrlKey || e.metaKey) && (e.key == "p" || e.charCode == 16 || e.charCode == 112 || e.keyCode == 80) ){
alert("Please use the Print PDF button below for a better rendering on the document");
e.cancelBubble = true;
e.preventDefault();
e.stopImmediatePropagation();
}
});

To disable Ctrl+P printing by using javascript use below code:
window.addEventListener('keydown', function(event) {
if (event.keyCode === 80 && (event.ctrlKey || event.metaKey) && !event.altKey && (!event.shiftKey || window.chrome || window.opera)) {
event.preventDefault();
if (event.stopImmediatePropagation) {
event.stopImmediatePropagation();
} else {
event.stopPropagation();
}
return;
}
}, true);

Your code works in the jsfiddle example? What browser are you using? Itested it with the latest chrome and it worked fine.
You can also add:
e.preventDefault();

This Actually worked for me in chrome. I was pretty suprised.
jQuery(document).bind("keyup keydown", function(e){
if(e.ctrlKey && e.keyCode == 80){
Print(); e.preventDefault();
}
});
Where Print is a function I wrote that calls window.print(); It also works as a pure blocker if you disable Print();
As noted here: https://stackoverflow.com/a/20121038/2102085
window.print() will pause so you can add an onPrintFinish or onPrintBegin like this
function Print(){
onPrintBegin
window.print();
onPrintFinish();
}
(Again this is just chrome, but Peter has a downvoted solution below that claims the keycodes are different for ff and ie)

had a journy finding this, should be canceled on the keydown event
document.addEventListener('keydown',function(e){
e.preventDefault();
return false;
});
further simplified to :
document.onkeydown = function(e){
e.preventDefault();
}
given you have only one keydown event

there are some shortcuts you simply can't override with javascript, i learned it the hard way. I suppose CTRL+P is one of them.
one way to override them would be to deploy a chrome pacakged app.

Try this
//hide body on Ctrl + P
jQuery(document).bind("keyup keydown", function (e) {
if (e.ctrlKey && e.keyCode == 80) {
$("body").hide();
return false;
}
});

Here is the code, it work for me
document.addEventListener("keydown", function(event) {
if (event.ctrlKey && event.key === "p") {
event.preventDefault();
}
});

<script>
function isKeyPressed(event)
{
if(event.ctrlKey == 1)
{
alert("Please Submit exam form befor printing");
}
}
</script>
<body onkeydown="isKeyPressed(event)">
<p>this is the solution</p>
</body>

If you want to disable printing of your webpage you're wasting your time: it can't be done. Even if you work out how to capture CTRL-P users can still use the browsers menu bar to find the print command, or they can take a screen shot of the browser.
Stop trying to control the user, put your energy into making your site / app more useful, not less useful.
edit 2016: in the 3 years this has been up it has gathered 3 downvotes. I'm still not deleting it. I think it is important to tell fellow developers when they are given impossible tasks, or tasks that make no sense.
edit 2018: still think it's important that people that have this question read this answer.

Keyboard shortcut ctrl+r not working for me

In the snippet below, Ctrl+Enter (event.which == 13) is working. However, Ctrl+R (event.which == 9) is not.
if ($('.selector')) {
$(document).keypress(function(event) {
if ( event.altKey && event.which == 13 ) {
$('.link a').trigger('click');
} else if ( event.altKey && event.which == 82 ) {
$('.link a').trigger('click');
} else {
return false;
}
});
}

The problem with your code is the keyPress listener behaves differently and uses a different set of keyCode. For keyPress the r key is 114 while for keyDown it is 82.
Also another problem is browser's default reload function will override your function because keypress is executed after you release the key. To solve this, change keypress to keydown.
$(document).keydown(function(e){
if(e.which === 82 && e.ctrlKey){ //keycode is 82 for keydown
alert("Pressed!");
e.preventDefault(); //stop browser from reloading
}
});
http://jsfiddle.net/DerekL/3P9NS/show
PS: It seems like Firefox is ignoring e.preventDefault (which by W3C standards it should). The best thing to do to support all browsers is to choose another combination, or use ctrl + alt + r.
if(e.which === 82 && e.ctrlKey && e.altKey){

Based on some quick testing at http://api.jquery.com/event.which/, it seems you want event.which == 82, not event.which == 9. Although most browsers tend to use Ctrl + R to refresh the page, so this might not be the best way to handle whatever you're doing.

A cross-Browser solution to prevent Ctrl+R refresh page:
LIVE DEMO (works in Firefox, Chrome, Safari, Opera)
var keyEv = navigator.userAgent.indexOf('Firefox')>-1?["keypress",114]:["keydown",82];
$(document)[keyEv[0]](function(e) {
if ( e.ctrlKey && e.which == keyEv[1] ){
e.preventDefault();
alert("CTRL+R");
}
});
By simply testing for our navigator.userAgent you can decide what Key event listener to use and the respective R key code.
If you need to handle both R and ENTER in combination with Ctrl than you just need this little tweak:
LIVE DEMO (again all browsers :) )
var keyEv = navigator.userAgent.indexOf('Firefox')>-1?["keypress",114]:["keydown",82];
$(document)[keyEv[0]](function(e) {
var k = e.which;
if ( e.ctrlKey && k==keyEv[1] || k==13 ){ // no XBrowser issues with 13(Enter)
// so go for it!
e.preventDefault();
alert("Do something here");
}
});

Handling 'ctrl+s' keypress event for browser

I was trying to implement the CTRL+S feature for a browser based application. I made a search and came across two scripts in the following to questions
Best cross-browser method to capture CTRL+S with JQuery?
Ctrl+S preventDefault in Chrome
However, when I tried to implement it, it worked but, I still get the default browser save dialog box/window.
My Code:For shortcut.js:
shortcut.add("Ctrl+S",function() {
alert("Hi there!");
},
{
'type':'keydown',
'propagate':false,
'target':document
});
jQuery hotkeys.js:
$(document).bind('keydown', 'ctrl+s', function(e) {
e.preventDefault();
alert('Ctrl+S');
return false;
});
I believe e.preventDefault(); should do the trick, but for some reason it doesn't work. Where am I going wrong.Sorry if it is simple, still learning jJvascript.

You don't need any of those libraries, just try this:
$(document).on('keydown', function(e){
if(e.ctrlKey && e.which === 83){ // Check for the Ctrl key being pressed, and if the key = [S] (83)
console.log('Ctrl+S!');
e.preventDefault();
return false;
}
});
The problem was that your code halted at the alert(), preventing your function from interrupting the save dialogue.
(Still uses jQuery)

This is to just add a different implementation to the question used by me.
Adapted from a SO answer.Also,works for MAC
document.addEventListener("keydown", function(e) {
if (e.keyCode == 83 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)) {
e.preventDefault();
//your implementation or function calls
}
}, false);

People are still viewing this it seems, so it's probably worth pointing out that there is no need for jQuery on this one, here:
function keydown (event) {
var isCtrlKeyDown = navigator.platform.indexOf("Mac") > -1 ? event.metaKey : event.ctrlKey,
isSDown = (event.key && event.key === "s") || (event.keyCode || event.which) === 83 // falls back to keycode if no event.key
if (isCtrlKeyDown && isSDown) {
// prevent default event on newer browsers
if (event.preventDefault) {
event.preventDefault()
}
// ... your code here ...
// prevent default event on older browsers
return false
}
}
// register the event
if (document.addEventListener) {
document.addEventListener("keydown", keydown)
} else {
document.onkeydown = keydown
}
That should work in all browsers, this will also work for folks using alternative keyboard layouts from QWERTY on Windows, which reports incorrect key codes (at least on Chrome 56 on Windows 10 in my testing)
However, this looks kind of clunky, and confusing, so if you are only supporting modern browsers, you can do the following instead:
document.addEventListener("keydown", function keydown (event) {
if (navigator.platform === "MacIntel" ? event.metaKey : event.ctrlKey && event.key === "s") {
event.preventDefault()
// ... your code here ...
}
})

As of 2017, instead of using e.keyCode === 83 you should use e.key === 's' as the former is deprecated.

No need to use any plugin, just use below jquery code
$(document).bind('keydown', 'ctrl+s', function (e) {
if (e.ctrlKey && (e.which == 83)) {
e.preventDefault();
//Your method()
return false;
}
});
Since you are using alert, the execution halts at the alert and "return false" is not executed until you close the alertbox, thats the reason you see the default dialog.
If your method is long running better use asyn method method instead.

How to detect Ctrl+V, Ctrl+C using JavaScript?

How to detect Ctrl+V, Ctrl+C using JavaScript?
I need to restrict pasting in my textareas, end user should not copy and paste the content, user should only type text in textarea.
How can I achieve this?

I just did this out of interest. I agree it's not the right thing to do, but I think it should be the op's decision... Also the code could easily be extended to add functionality, rather than take it away (like a more advanced clipboard, or Ctrl+S triggering a server-side save).
$(document).ready(function() {
var ctrlDown = false,
ctrlKey = 17,
cmdKey = 91,
vKey = 86,
cKey = 67;
$(document).keydown(function(e) {
if (e.keyCode == ctrlKey || e.keyCode == cmdKey) ctrlDown = true;
}).keyup(function(e) {
if (e.keyCode == ctrlKey || e.keyCode == cmdKey) ctrlDown = false;
});
$(".no-copy-paste").keydown(function(e) {
if (ctrlDown && (e.keyCode == vKey || e.keyCode == cKey)) return false;
});
// Document Ctrl + C/V
$(document).keydown(function(e) {
if (ctrlDown && (e.keyCode == cKey)) console.log("Document catch Ctrl+C");
if (ctrlDown && (e.keyCode == vKey)) console.log("Document catch Ctrl+V");
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<h3>Ctrl+c Ctrl+v disabled</h3>
<textarea class="no-copy-paste"></textarea>
<br><br>
<h3>Ctrl+c Ctrl+v allowed</h3>
<textarea></textarea>
Also just to clarify, this script requires the jQuery library.
Codepen demo
EDIT: removed 3 redundant lines (involving e.which) thanks to Tim Down's suggestion (see comments)
EDIT: added support for Macs (CMD key instead of Ctrl)

With jquery you can easy detect copy, paste, etc by binding the function:
$("#textA").bind('copy', function() {
$('span').text('copy behaviour detected!')
});
$("#textA").bind('paste', function() {
$('span').text('paste behaviour detected!')
});
$("#textA").bind('cut', function() {
$('span').text('cut behaviour detected!')
});
More information here: http://www.mkyong.com/jquery/how-to-detect-copy-paste-and-cut-behavior-with-jquery/

While it can be annoying when used as an anti-piracy measure, I can see there might be some instances where it'd be legitimate, so:
function disableCopyPaste(elm) {
// Disable cut/copy/paste key events
elm.onkeydown = interceptKeys
// Disable right click events
elm.oncontextmenu = function() {
return false
}
}
function interceptKeys(evt) {
evt = evt||window.event // IE support
var c = evt.keyCode
var ctrlDown = evt.ctrlKey||evt.metaKey // Mac support
// Check for Alt+Gr (http://en.wikipedia.org/wiki/AltGr_key)
if (ctrlDown && evt.altKey) return true
// Check for ctrl+c, v and x
else if (ctrlDown && c==67) return false // c
else if (ctrlDown && c==86) return false // v
else if (ctrlDown && c==88) return false // x
// Otherwise allow
return true
}
I've used event.ctrlKey rather than checking for the key code as on most browsers on Mac OS X Ctrl/Alt "down" and "up" events are never triggered, so the only way to detect is to use event.ctrlKey in the e.g. c event after the Ctrl key is held down. I've also substituted ctrlKey with metaKey for macs.
Limitations of this method:
Opera doesn't allow disabling right click events
Drag and drop between browser windows can't be prevented as far as I know.
The edit->copy menu item in e.g. Firefox can still allow copy/pasting.
There's also no guarantee that for people with different keyboard layouts/locales that copy/paste/cut are the same key codes (though layouts often just follow the same standard as English), but blanket "disable all control keys" mean that select all etc will also be disabled so I think that's a compromise which needs to be made.

If you use the ctrlKey property, you don't need to maintain state.
$(document).keydown(function(event) {
// Ctrl+C or Cmd+C pressed?
if ((event.ctrlKey || event.metaKey) && event.keyCode == 67) {
// Do stuff.
}
// Ctrl+V or Cmd+V pressed?
if ((event.ctrlKey || event.metaKey) && event.keyCode == 86) {
// Do stuff.
}
// Ctrl+X or Cmd+X pressed?
if ((event.ctrlKey || event.metaKey) && event.keyCode == 88) {
// Do stuff.
}
}

There's another way of doing this: onpaste, oncopy and oncut events can be registered and cancelled in IE, Firefox, Chrome, Safari (with some minor problems), the only major browser that doesn't allow cancelling these events is Opera.
As you can see in my other answer intercepting Ctrl+V and Ctrl+C comes with many side effects, and it still doesn't prevent users from pasting using the Firefox Edit menu etc.
function disable_cutcopypaste(e) {
var fn = function(evt) {
// IE-specific lines
evt = evt||window.event
evt.returnValue = false
// Other browser support
if (evt.preventDefault)
evt.preventDefault()
return false
}
e.onbeforepaste = e.onbeforecopy = e.onbeforecut = fn
e.onpaste = e.oncopy = e.oncut = fn
}
Safari still has some minor problems with this method (it clears the clipboard in place of cut/copy when preventing default) but that bug appears to have been fixed in Chrome now.
See also: http://www.quirksmode.org/dom/events/cutcopypaste.html and the associated test page http://www.quirksmode.org/dom/events/tests/cutcopypaste.html for more information.

Live Demo :
http://jsfiddle.net/abdennour/ba54W/
$(document).ready(function() {
$("#textA").bind({
copy : function(){
$('span').text('copy behaviour detected!');
},
paste : function(){
$('span').text('paste behaviour detected!');
},
cut : function(){
$('span').text('cut behaviour detected!');
}
});
});

Short solution for preventing user from using context menu, copy and cut in jQuery:
jQuery(document).bind("cut copy contextmenu",function(e){
e.preventDefault();
});
Also disabling text selection in CSS might come handy:
.noselect {
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}

Another approach (no plugin needed) it to just use ctrlKey property of the event object that gets passed in. It indicates if Ctrl was pressed at the time of the event, like this:
$(document).keypress("c",function(e) {
if(e.ctrlKey)
alert("Ctrl+C was pressed!!");
});
See also jquery: keypress, ctrl+c (or some combo like that).

You can use this code for rightclick, CTRL+C, CTRL+V, CTRL+X detect and prevent their action
$(document).bind('copy', function(e) {
alert('Copy is not allowed !!!');
e.preventDefault();
});
$(document).bind('paste', function() {
alert('Paste is not allowed !!!');
e.preventDefault();
});
$(document).bind('cut', function() {
alert('Cut is not allowed !!!');
e.preventDefault();
});
$(document).bind('contextmenu', function(e) {
alert('Right Click is not allowed !!!');
e.preventDefault();
});

instead of onkeypress, use onkeydown.
<input type="text" onkeydown="if(event.ctrlKey && event.keyCode==86){return false;}" name="txt">

If anyone is interested in a simple vanilla JavaScript approach, see below.
Fiddle Link: DEMO
let ctrlActive = false;
let cActive = false;
let vActive = false
document.body.addEventListener('keyup', event => {
if (event.key == 'Control') ctrlActive = false;
if (event.code == 'KeyC') cActive = false;
if (event.code == 'KeyV') vActive = false;
})
document.body.addEventListener('keydown', event => {
if (event.key == 'Control') ctrlActive = true;
if (ctrlActive == true && event.code == 'KeyC') {
// this disables the browsers default copy functionality
event.preventDefault()
// perform desired action(s) here...
console.log('The CTRL key and the C key are being pressed simultaneously.')
}
if (ctrlActive == true && event.code == 'KeyV') {
// this disables the browsers default paste functionality
event.preventDefault()
// perform desired action(s) here...
console.log('The CTRL key and the V key are being pressed simultaneously.')
}
})
The code above would disable the default copy in the browser. If you'd like keep the copy functionality in the browser, just comment out this bit: event.preventDefault() and you can then run any desired actions while allowing the user to copy content.

I wrote a jQuery plugin, which catches keystrokes. It can be used to enable multiple language script input in html forms without the OS (except the fonts). Its about 300 lines of code, maybe you like to take a look:
http://miku.github.com/jquery-retype
Generally, be careful with such kind of alterations. I wrote the plugin for a client because other solutions weren't available.

Don't forget that, while you might be able to detect and block Ctrl+C/V, you can still alter the value of a certain field.
Best example for this is Chrome's Inspect Element function, this allows you to change the value-property of a field.

A hook that allows for overriding copy events, could be used for doing the same with paste events. The input element cannot be display: none; or visibility: hidden; sadly
export const useOverrideCopy = () => {
const [copyListenerEl, setCopyListenerEl] = React.useState(
null as HTMLInputElement | null
)
const [, setCopyHandler] = React.useState<(e: ClipboardEvent) => void | null>(
() => () => {}
)
// appends a input element to the DOM, that will be focused.
// when using copy/paste etc, it will target focused elements
React.useEffect(() => {
const el = document.createElement("input")
// cannot focus a element that is not "visible" aka cannot use display: none or visibility: hidden
el.style.width = "0"
el.style.height = "0"
el.style.opacity = "0"
el.style.position = "fixed"
el.style.top = "-20px"
document.body.appendChild(el)
setCopyListenerEl(el)
return () => {
document.body.removeChild(el)
}
}, [])
// adds a event listener for copying, and removes the old one
const overrideCopy = (newOverrideAction: () => any) => {
setCopyHandler((prevCopyHandler: (e: ClipboardEvent) => void) => {
const copyHandler = (e: ClipboardEvent) => {
e.preventDefault()
newOverrideAction()
}
copyListenerEl?.removeEventListener("copy", prevCopyHandler)
copyListenerEl?.addEventListener("copy", copyHandler)
copyListenerEl?.focus() // when focused, all copy events will trigger listener above
return copyHandler
})
}
return { overrideCopy }
}
Used like this:
const customCopyEvent = () => {
console.log("doing something")
}
const { overrideCopy } = useOverrideCopy()
overrideCopy(customCopyEvent)
Every time you call overrideCopy it will refocus and call your custom event on copy.

Another simple way using Jquery:
$(document).keydown( function(e)
{
if (e.ctrlKey && e.key == 'c')
{
console.log('got ctrl c');
}
else if (e.ctrlKey && e.key == 'v')
{
console.log('got ctrl v');
}
});

element.addEventListener('keydown', function (e) {
if (e.key == 'c' && e.ctrlKey) {
e.preventDefault(); // prevent from copying
}
if (e.key == 'v' && e.ctrlKey) {
e.preventDefault(); // prevent from pasting
}
}

i already have your problem and i solved it by the following code .. that accept only numbers
$('#<%= mobileTextBox.ClientID %>').keydown(function(e) {
///// e.which Values
// 8 : BackSpace , 46 : Delete , 37 : Left , 39 : Rigth , 144: Num Lock
if (e.which != 8 && e.which != 46 && e.which != 37 && e.which != 39 && e.which != 144
&& (e.which < 96 || e.which > 105 )) {
return false;
}
});
you can detect Ctrl id e.which == 17

Important note
I was using e.keyCode for a while and i detected that when i press Ctrl+., This attribute returns a wrong number, 190, while the ascii code of . is 46!
So you should use e.key.toUpperCase().charCodeAt(0) instead of e.keyCode.
$(document).keydown(function(event) {
let keyCode = e.key.toUpperCase().charCodeAt(0);
...
}

You can listen to the keypress event, and halt the default event (entering the text) if it matches the specific keycodes

There is some ways to prevent it.
However the user will be always able to turn the javascript off or just look on the source code of the page.
Some examples (require jQuery)
/**
* Stop every keystroke with ctrl key pressed
*/
$(".textbox").keydown(function(){
if (event.ctrlKey==true) {
return false;
}
});
/**
* Clear all data of clipboard on focus
*/
$(".textbox").focus(function(){
if ( window.clipboardData ) {
window.clipboardData.setData('text','');
}
});
/**
* Block the paste event
*/
$(".textbox").bind('paste',function(e){return false;});
Edit: How Tim Down said, this functions are all browser dependents.