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Disabled scrolling by pressing spacebar, Then how to enable white spaces in textarea and ...?

I have disabled scrolling by pressing spacebar using code
in-line(434)
And I use code in-line(427-432) to play/pause video by pressing spacebar anywhere in body.
// So how to enable white-spaces in textarea?
And how to disable playing/pausing video by pressing spacebar in textarea? //
I have tried code in-line(433) to enable white-spaces in textarea but it doesn't work.
https://imgur.com/a/morZomC
427-432:
Object.defineProperty(HTMLMediaElement.prototype, 'playing', {
get: function() {
return !!(this.currentTime > 0 && !this.paused && !this.ended && this.readyState > 2); } });
$("body").on("keydown", function(e) { if (e.keyCode == 32) {
if (document.querySelector("video").playing) {
$("video")[0].pause(); } else {
$("video")[0].play(); } } });
433:
$("#comment").on("keydown", function(e) { if (e.keyCode == 32) { return true; } });
434:
$(document).keydown(function(e) { if (e.which == 32) { return false; } });

In your document listener, only return false if the target of the event is not a textarea:
$(document).keydown(function(e) {
if (e.which == 32 && e.target.tagName !== 'TEXTAREA') {
return false;
}
});
body {
height: 2000px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea></textarea>
Or, to additionally permit spaces in inputs:
$(document).keydown(function(e) {
if (e.which == 32 && !['TEXTAREA', 'INPUT'].includes(e.target.tagName)) {
return false;
}
});
body {
height: 2000px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea></textarea>
<input>

Is there a way in JavaScript to change Enter to Shift + Enter

This is what I tried and obviously failed:
ed.on('keyup', function(e){
console.log(e.keyCode)
if(e.keyCode == 13 && !e.shiftKey){
e.shiftKey = true;
e.keyCode = 13;
$(this).trigger(e);
}
else if (e.keyCode == 13 && e.shiftKey){
e.shiftKey = false;
e.keyCode = 13;
$(this).trigger(e);
}
});
Is there a way to do this cause based on what I seen I think I'm on the right track and most likely just not triggering it early or something similar.
Additionally, I tried using 'keypress' instead and had no luck with that.

document.onkeydown = function onkeydown(e) {
if (e.keyCode == 13 && e.shiftKey==false) {
e.preventDefault();
document.execCommand("insertLineBreak");
}
}

When enter is pressed without shift, trigger keydown with enter and shift!
$('input').on('keydown', function(event) {
if (event.keyCode == 13 && !event.shiftKey) {
$(this).trigger(jQuery.Event("keydown", {
keyCode: 13, // ENTER
shiftKey: true
}));
} else if (event.keyCode == 13 && event.shiftKey) {
console.log('shift + enter');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input/>

I have a code that won't accept white spaces when keypress but it's not working.

Here is my code:
<script>
$(function() {
$('body').on('keydown', '#distype, #val', function(e) {
console.log(this.value);
if (e.which === 32 && e.target.selectionStart === 0) {
return false;
}
});
});
</script>
the #distype, #val are the id of the text input.

You are attaching the onKeyDown Listener to body. Shouldn't be to the input itself? Also, it should be e.which || e.keyCode.
like so:
$("#distype").on("keydown", function (e){
console.log(this.value);
if (e.which && e.target.selectionStart === 0 || e.keyCode === 32 && e.target.selectionStart === 0) {
return false;
}
}

how can i use capslock function on a virtual keyboard using javascript if the textarea that handles the string value is readOnly?

i have used this code but it only detects if the capslock is on or off.
$(function () {
var isShiftPressed = false;
var isCapsOn = null;
$("#txtName").bind("keydown", function (e) {
var keyCode = e.keyCode ? e.keyCode : e.which;
if (keyCode == 16) {
isShiftPressed = true;
}
});
$("#txtName").bind("keyup", function (e) {
var keyCode = e.keyCode ? e.keyCode : e.which;
if (keyCode == 16) {
isShiftPressed = false;
}
if (keyCode == 20) {
if (isCapsOn == true) {
isCapsOn = false;
$("#error").hide();
} else if (isCapsOn == false) {
isCapsOn = true;
$("#error").show();
}
}
});
$("#txtName").bind("keypress", function (e) {
var keyCode = e.keyCode ? e.keyCode : e.which;
if (keyCode >= 65 && keyCode <= 90 && !isShiftPressed) {
isCapsOn = true;
$("#error").show();
} else {
$("#error").hide();
}
});
});
but this is not functioning if the textarea that hold the value is in readOnly state.
how can i fix it?

replace
$("#txtName")
with
$('body')

You could use onkeypress instead of onkeydown. The latter only detects which key was pressed; the former (even though counter-intuitively its name includes 'keypress') will give you the char. This link explains in detail: http://unixpapa.com/js/key.html Note that onkeypress is not supported by all browsers.
Also, your code for converting charcode to char is inefficient, and you're converting uppercase charcodes to lowercase chars. Here's some code that listens for key presses and on each one, alerts the user which char was pressed.
document.onkeypress = function(event){
event = event || window.event;
var key = event.keyCode;
alert(String.fromCharCode(key));
}

if (event.keyCode == "65"){
document.getElementById("txtInput").value+=val1;
btnA.style.backgroundColor="#00bfff";
}
if (event.keyCode == "66"){
document.getElementById("txtInput").value+="b";
btnB.style.backgroundColor="#00bfff";
}
if (event.keyCode == "67"){
document.getElementById("txtInput").value+="c";
btnC.style.backgroundColor="#00bfff";
}
if (event.keyCode == "68"){
document.getElementById("txtInput").value+="d";
btnD.style.backgroundColor="#00bfff";
}
if (event.keyCode == "69"){
document.getElementById("txtInput").value+="e";
btnE.style.backgroundColor="#00bfff";
}
if (event.keyCode == "70"){
document.getElementById("txtInput").value+="f";
btnF.style.backgroundColor="#00bfff";
}
if (event.keyCode == "71"){
document.getElementById("txtInput").value+="g";
btnG.style.backgroundColor="#00bfff";
}
if (event.keyCode == "72"){
document.getElementById("txtInput").value+="h";
btnH.style.backgroundColor="#00bfff";
}
if (event.keyCode == "73"){
document.getElementById("txtInput").value+="i";
btnI.style.backgroundColor="#00bfff";
}
if (event.keyCode == "74"){
document.getElementById("txtInput").value+="j";
btnJ.style.backgroundColor="#00bfff";
}
if (event.keyCode == "75"){
document.getElementById("txtInput").value+="k";
btnK.style.backgroundColor="#00bfff";
}
if (event.keyCode == "76"){
document.getElementById("txtInput").value+="l";
btnL.style.backgroundColor="#00bfff";
}
if (event.keyCode == "77"){
document.getElementById("txtInput").value+="m";
btnM.style.backgroundColor="#00bfff";
}
if (event.keyCode == "78"){
document.getElementById("txtInput").value+="n";
btnN.style.backgroundColor="#00bfff";
}
if (event.keyCode == "79"){
document.getElementById("txtInput").value+="o";
btnO.style.backgroundColor="#00bfff";
}
if (event.keyCode == "80"){
document.getElementById("txtInput").value+="p";
btnP.style.backgroundColor="#00bfff";
}
if (event.keyCode == "81"){
document.getElementById("txtInput").value+="q";
btnQ.style.backgroundColor="#00bfff";
}
if (event.keyCode == "82"){
document.getElementById("txtInput").value+="r";
btnR.style.backgroundColor="#00bfff";
}
if (event.keyCode == "83"){
document.getElementById("txtInput").value+="s";
btnS.style.backgroundColor="#00bfff";
}
if (event.keyCode == "84"){
document.getElementById("txtInput").value+="t";
btnT.style.backgroundColor="#00bfff";
}
if (event.keyCode == "85"){
document.getElementById("txtInput").value+="u";
btnU.style.backgroundColor="#00bfff";
}
if (event.keyCode == "86"){
document.getElementById("txtInput").value+="v";
btnV.style.backgroundColor="#00bfff";
}
if (event.keyCode == "87"){
document.getElementById("txtInput").value+="w";
btnW.style.backgroundColor="#00bfff";
}
if (event.keyCode == "88"){
document.getElementById("txtInput").value+="x";
btnX.style.backgroundColor="#00bfff";
}
if (event.keyCode == "89"){
document.getElementById("txtInput").value+="y";
btnY.style.backgroundColor="#00bfff";
}
if (event.keyCode == "90"){
document.getElementById("txtInput").value+="z";
btnZ.style.backgroundColor="#00bfff";
}
thats the code i used so when i press a-z in the keyboard it will have a-z in the textarea. But even if the capslock is ON its still on lowercase.

Number in textfield should be autoformatted only after user clicks outside the textbox?

I have a problem. Basically, what happens in my case is that the numbers in my textbox are autoformatted as I type. I don't want this to happen. What I want is that the numbers should be autoformatted only when the user clicks outside the textbox.
In my input tag I have :
onkeyup="format(event, this);"
My javascript function is :
function format(e, obj) {
if (e.keyCode == 36) {
press1(obj);
}
if (e.keyCode == 13) {
return false;
}
if ((e.keyCode <= 34) || (e.keyCode >= 46 && e.keyCode < 58) || (e.keyCode >= 96 && e.keyCode <= 105)) { // //alert(e.keyCode);
obj.value = CommaFormatted(obj.value);
} else {
if (e && e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
} else {
e.cancelBubble = true;
e.returnValue = false;
}
return false;
}
}
where the press1 function is:
function press1(textControlID) {
var text = textControlID;
if (text.getAttribute("maxlength") == text.value.length) {
var FieldRange = text.createTextRange();
FieldRange.moveStart('character', text.value.length);
FieldRange.collapse();
FieldRange.select();
return true;
}
if (text != null && text.value.length > 0) {
if (text.createTextRange) {
var FieldRange = text.createTextRange();
FieldRange.moveStart('character', text.value.length);
FieldRange.collapse();
FieldRange.select();
} else if (text.setSelectionRange) {
var textLength = text.value.length;
text.setSelectionRange(textLength, textLength);
}
}
}
I really hope this could be solved. Please!

You could change onkeyup to onblur, which is the event that gets fired when the control loses focus - clicking out of it.
The onkeyup event fires with every keypress.