We Keep Coding

Tabs default action is not stopped event though i use e.preventDefault()

I am showing a text area in a modal when I pressed tab it moves to the next input I wrote code to stop this but I didn't work for me.(when I pressed tab the execution even not coming to the acceptTabsSpace function)
$(document).on("keyup", "#collection-text-input", acceptTabsSpace);
function acceptTabsSpace(e){
var keyCode = e.keyCode || e.which;
if (keyCode == 9) {
e.preventDefault();
return false;
}
}

Add the listener to trigger on keydown instead:
$(document).on("keydown", "#collection-text-input", acceptTabsSpace);
function acceptTabsSpace(e){
var keyCode = e.keyCode || e.which;
if (keyCode === 9) {
e.preventDefault();
return false;
}
}

Use keydown instead key up and for tabspaces press tab twice.
$(document).on("keydown", "#collection-text-input", acceptTabsSpace);
function acceptTabsSpace(e) {
var keyCode = e.keyCode || e.which;
if (e.keyCode === 9) {
e.preventDefault();
this.value = this.value.substring(0, this.selectionStart) + "\t" +
this.value.substring(this.selectionEnd);
this.selectionEnd = s + 1;
}
}

Hotkey combinations don't work if done fast

I'm trying to make a hotkey for a web app, for example Ctrl + z performs the undo function.
It seems that when I press the keys fast (as I'm used to from using desktop apps a lot), it doesn't register. The single key press registers, but it misses the combination for some reason.
From what I understand, you have to keep track of which buttons are held down via keypress events, which is what I've done below.
Try the code below. Hitting Z outputs Z. Hitting CTRL then Z slowly outputs CTRL + Z. Hitting CTRL then Z quickly outputs Z. When I perform the action at the same speed in say Notepad for windows, it works flawlessly almost every time.
https://codepen.io/samkeddy/pen/YQjgdZ?editors=1010#0
var ctrlPressed=false, altPressed=false;
window.addEventListener("keydown", function (e) {
hotkey = e;
if (e.keyCode == 17) ctrlPressed = true;
if (e.keyCode == 18) altPressed = true;
e.preventDefault();
});
window.addEventListener("keyup", function (e) {
hotkey = window.event;
if (e.keyCode == 17) ctrlPressed = false;
if (e.keyCode == 18) altPressed = false;
if (e.keyCode == 90){
if (altPressed && ctrlPressed && e.keyCode == 90)
addText('ALT + CTRL + Z');
else if (ctrlPressed && e.keyCode == 90)
addText('CTRL + Z');
else
addText('Z');
}
});
//meaningless, just adds text to doc so you can see it
function addText(text) {
var theDiv = document.getElementById("output");
theDiv.appendChild(document.createElement("br"));
var content = document.createTextNode(text);
theDiv.appendChild(content);
}

Use e.ctrlKey to check if ctrl is down instead of variables, and just check for the hotkey combination on keydown, don't do anything on key up.
https://codepen.io/samkeddy/pen/gRdBpq
function KeyPress(e) {
var evtobj = window.event? event : e
if (evtobj.keyCode == 90 && evtobj.ctrlKey) addText("CTRL + Z");
else if (evtobj.keyCode == 90) addText("Z");
}
document.onkeydown = KeyPress;

Disable Chrome's text input undo/redo (CTRL+Z / CTRL+Y)

i'm currently developing a web application and i encounter a problem.
As you might know or not, chrome has a feature that gives <input> (especially text inputs) an "undo" function when you hit CTRL+Z and "redo" with CTRL+Y it may seem like a good feature in normal websites, but currently i'm making an image editor that also uses those keyboard shortcuts (CTRL+Z & CTRL+Y).
in my app i also have a text input, so when i change the text input's content and then hit CTRL+Z to undo the changes in my image editor, it would undo the change in the text editor instead!
here is a Codepen that would demonstrate the effect(instruction is in the Codepen)
So in conclusion i want to remove the undo/redo function in chrome how can i do that?

var ctrlDown = false;
var ctrlKey = 17, vKey = 86, cKey = 67, zKey = 90;
document.body.onkeydown = function(e) {
if (e.keyCode == 17 || e.keyCode == 91) {
ctrlDown = true;
}
if ((ctrlDown && e.keyCode == zKey) || (ctrlDown && e.keyCode == vKey) || (ctrlDown && e.keyCode == cKey)) {
e.preventDefault();
return false;
}
}
document.body.onkeyup = function(e) {
if (e.keyCode == 17 || e.keyCode == 91) {
ctrlDown = false;
};
};
<body>
<input type='text' value='test' />
</body>
Does this work?
Stolen from here, found on here as a comment by #KadeHafen.

You could use onkeydown event, and preventDefault.. eg.
document.onkeydown = function(e) {
if (e.ctrlKey && e.key === 'z') {
e.preventDefault();
alert("CTRL + Z!");
}
}

Disable Ctrl key in IE 8

I want to disable the ctrl key in the IE browser.I had tried some solution using javascript but nothing is working can someone please help me to find out the solution
document.onkeydown = function () {
if (event.keyCode == 17) alert('Ctrl Key is disabled');
};
document.onkeydown = function(e) {
if (e.altKey && (e.keyCode === 36)) {//Alt+home blocked.
return false;
}
if (e.altKey && (e.keyCode === 70)) {//Alt+f blocked.
return false;
}
};
function hookKeyboardEvents(e) {
// get key code
var key_code = (window.event) ? event.keyCode : e.which;
// case :if it is IE event
if (window.event)
{
if (!event.shiftKey && !event.ctrlKey) {
window.event.returnValue = null;
event.keyCode = 0;
}
}
// case: if it is firefox event
else
e.preventDefault();
}
window.document.onkeydown = hookKeyboardEvents;

function Disable_Control_C() {
var keystroke = String.fromCharCode(event.keyCode).toLowerCase();
if (event.ctrlKey && (keystroke == 'c' || keystroke == 'v' || keystroke == 'p' || keystroke == 's' || keystroke == 'u')) {
alert("this function is disabled");
event.returnValue = false; // disable Ctrl+C
}
}
<body onkeydown="javascript:Disable_Control_C()">
this is what i do it to run in the IE...

How to prevent Chrome open history after press CTRL+H

I mean is there any way to prevent the default accesskey in Chrome.
var text = document.getElementById("text");
text.onkeyup = function(e) {
if(e.ctrlKey && e.keyCode == 72) {
// do something...
alert("You wont see me cause Chrome will open history manager");
}
}
<textarea id="text"></textarea>

This should work. You need Keydown Event.
var text = document.getElementById("text");
text.addEventListener("keydown", function(e) {
console.log(e.keyCode);
if (e.keyCode == 72 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)) {
e.preventDefault();
alert('Stopped');
}
}, false);
<textarea id="text"></textarea>

I've added isCtrlDown variable and keyup with keydown event, to achieve what you're looking for because I didn't see isKeyDown kind of function in Key as discussed here.
var isCtrlDown = false;
var text = document.getElementById("text");
text.onkeydown = function(e){
if(e.keyCode == 17){
isCtrlDown = true;
}
if(isCtrlDown && e.keyCode == 72){
// do something...
console.log("You wont see me cause Chrome will open history manager");
}
e.preventDefault();
}
text.onkeyup = function(e){
if(e.keyCode == 17){
isCtrlDown = false;
}
e.preventDefault();
}