Develop Reference

Disable all keys but copy paste combination

I am writing a code for number field where i have disabled all keys except number keys
function doValidation(event) {
var charCode = event.keyCode;
if (charCode != 190 && charCode != 40 && charCode != 39 && charCode != 38 && charCode != 37 && charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57) && (charCode < 96 || charCode > 105))
return false;
}
<input type="text" onkeydown="doValidation(event)">
Now i want to enable ctrl+c and ctrl+v in this funtion.

you can do this like below :)
var is_ctrl_pressed = false;
$('#number_input').on('keydown', function(e) {
var code = e.which;
if ((code > 47 && code < 59) || (code > 95 && code < 106) || (is_ctrl_pressed && (code == 67 || code == 86))) {
return true;
} else if (code == 17) {
is_ctrl_pressed = true;
} else {
return false;
}
});
$('#number_input').on('keyup', function(e) {
if (e.which == 17) {
is_ctrl_pressed = false;
}
});

Hope this will be helpful.
$('input[type="number"]').keypress(function(e){
//Numbers 47 to 57 are the key code of digit 0 to 9.
if (![48,49,50,51,52,53,54,55,56,57].includes(e.keyCode)){
e.preventDefault();
}
});

// Disable Right click
document.addEventListener('contextmenu', event => event.preventDefault());
// Disable key down
document.onkeydown = disableSelectCopy;
// Disable mouse down
document.onmousedown = dMDown;
// Disable click
document.onclick = dOClick;
function dMDown(e) { return false; }
function dOClick() { return true; }
function disableSelectCopy(e) {
// current pressed key
var pressedKey = String.fromCharCode(e.keyCode).toLowerCase();
if ((e.ctrlKey && (pressedKey == "c" || pressedKey == "x" || pressedKey == "v" || pressedKey == "a" || pressedKey == "u")) || e.keyCode == 123) {
return false;
}
}

Need help restricting a js function(that restricts invalid chars) to a particular input type

Hi i would like to restrict a function that allows only, numbers, back space and left & right arrow keys to inputs with number type, because when i implement it, it also affects my text inputs.
<script>
function chars(evt){
var key = window.event ? event.keyCode : event.which;
if (event.keyCode == 8 || event.keyCode == 46
|| event.keyCode == 37 || event.keyCode == 39) {
return true;
}
else if ( key < 48 || key > 57 ) {
return false;
}
else return true;
}
</script>

Assign an id to your <input>. Add an event listener to it, like :
function getKeyCode() {
var key = window.event ? event.keyCode : event.which;
if(event.keyCode == 8 || event.keyCode == 46
|| event.keyCode == 37 || event.keyCode == 39) {
console.log(true);
//return true;
} else if (key < 48 || key > 57) {
console.log(false);
// return false;
} else {
console.log(true);
// return true;
}
}
var el = document.getElementById("myInput");
el.addEventListener("keypress", getKeyCode);
<input type="text" id="myInput">

JQuery : Keypress not working on first press

This is my code
$(currentClass).keypress(function (e) {
if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
return false;
}
});
The only problem with this is that, every time I hit a key for the first time regardless a letter or a number, it shows up in my content editable span tag. However, the second time I hit a letter key the code works, it only accepts number. I have no idea what is wrong with this code in the first pressing of keys.

Use JQuery's .on() method.
$(currentClass).on("keypress",function (e) {
if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
return false;
}
});

This is what I used
if ($.inArray($event.keyCode, [46, 8, 9, 27, 13, 110, 190]) !== -1 ||
// Allow: Ctrl+A
($event.keyCode == 65 && $event.ctrlKey === true) ||
// Allow: home, end, left, right
($event.keyCode >= 35 && $event.keyCode <= 39)) {
// let it happen, don't do anything
return;
}
// Ensure that it is a number and stop the keypress
if (($event.shiftKey || ($event.keyCode < 48 || $event.keyCode > 57)) && ($event.keyCode < 96 || $event.keyCode > 105)) {
$event.preventDefault();
}
I was able to solve the problem with this. If their suggestion is not working try this.

Bind Properly your events
$(document).ready(function(){
$(body).on("keypress","currentClass",function (e) {
if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
return false;
}
});
});

$(currentClass).on('keypress', function (e) {
if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
e.preventDefault();
alert("pressed");
return false;
}
});
event - on
This might helps you :)

Key Press Event In Jquery

I have many input types in the form .Now i want that the user can enter only integer values in the input types.The input can be like this 110.00 only two values after ..But i am not able to get this features.
I have done with the interger input but i am not getting how can we do this :
Code
$(".amount_class").live("keypress",function(e){
var charCode = (e.which) ? e.which : e.keyCode;
var Enteted = String.fromCharCode(e.which).toLowerCase();
if ((charCode >= 48 && charCode <= 57) || charCode == 8 || charCode == 9 || charCode == 37 || charCode == 39 || (charCode == 46 && Enteted != '.'))
return true;
else
return false;
});
The values are amount and it can be decimal but not more than two after decimal sign.Please help me

I have done this and working fine for me :
$('.salary').live("keypress",function(e) {
var charCode = (e.which) ? e.which : e.keyCode;
var Enteted = String.fromCharCode(e.which).toLowerCase();
if(!((charCode >= 48 && charCode <= 57) || charCode == 8 || charCode == 9 || (charCode == 37 && Enteted !='%') || charCode == 39 || charCode == 46)) {
e.preventDefault();
}
if(charCode == 46 && $(this).val().indexOf('.') != -1 && Enteted ==".") {
e.preventDefault();
} // prevent if already dot
if(charCode == 46 && Enteted =="." && !$(this).val()) {
e.preventDefault();
}
if($(this).val().indexOf('.')!=-1){
if($(this).val().split(".")[1].length >= 2){
if(charCode != 8 && charCode != 46) e.preventDefault();
if( isNaN( parseFloat( this.value ) ) ) return;
this.value = parseFloat(this.value).toFixed(2);
}
}
return this;
});

Use as below
HTML
<input type="text" id="checkDecimal" class="decimal" />
JS
$(function () {
$('#checkDecimal').bind('paste', function () {
var self = this;
setTimeout(function () {
if (!/^\d*(\.\d{1,2})+$/.test($(self).val())) $(self).val('');
}, 0);
});
$('#checkDecimal').keypress(function (e) {
var character = String.fromCharCode(e.keyCode)
var newValue = this.value + character;
if (isNaN(newValue) || parseFloat(newValue) * 100 % 1 > 0) {
e.preventDefault();
return false;
}
});
});

have a look here.
Regex - /^\d+(\.\d{0,2})?$/g;
i have experimented here
<!DOCTYPE html>
<html>
<head>
<script
src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$('#input_field').keyup(function(e) {
var regex = /^\d+(\.\d{0,2})?$/g;
if (!regex.test(this.value)) {
this.value = '';
}
});
});
</script>
</head>
<body>
<input type= "text" id = "input_field" name ="input_field" value=""/>
</body>
</html>

The logic is every time a user entering a number you have to check two things.
Has the user entered decimal point?
Are the decimal places more than two?
For the first one you can use $(this).val().indexOf('.') != -1For the second one you can use $(this).val().substring($(this).val().indexOf('.'), $(this).val().indexOf('.').length).length > 2
Here is the code:
$('.amount_class').keypress(function (event) {
if ((event.which != 46 || $(this).val().indexOf('.') != -1) && (event.which < 48 || event.which > 57)) {
event.preventDefault();
}
var text = $(this).val();
if ((text.indexOf('.') != -1) && (text.substring(text.indexOf('.')).length > 2)) {
event.preventDefault();
}
});
And the DEMO

Simply use
value.toFixed(2);
thats it..

jquery keydown for only digits

i have an input box that is for payments, and i want to only allow number like x.xx, of course xxxx.x will work or xxxxx
i have the setup pretty much working minus some weird behavior. if the numbers 1 and 2 after the decimal can be 2 digits long (works) but if i press 3-9 then it only allows one of that digit. also 0's to the right of the decimal are being allowed infinitely.
heres what im working with. also i want to only allow the enter button and when its pressed then run a function
$('#money-button-input-box').keydown(function(event) {
var str = $(this).val()
if(str.length >= 1){
var rightHalf = str.split('.')[1];
if(rightHalf >= 3 && event.keyCode != 8 ){
event.preventDefault();
}
}
if( (event.keyCode == 190 || event.keyCode == 110) && str.replace(/[^.]/g, "").length >= 1 ){
event.preventDefault();
}
allowOnlyNumbers(event);
if (event.keyCode == 13) {
if($(this).val() == '')return;
enterPayment($(this));
}
});
and the function
function allowOnlyNumbers(events){
// Allow: backspace, delete, tab, escape, and enter
if ( events.keyCode == 46 || events.keyCode == 8 || events.keyCode == 9 || events.keyCode == 27 || events.keyCode == 13 ||
// allow decimals
events.keyCode == 190 || events.keyCode == 110 ||
// Allow: Ctrl+A
(events.keyCode == 65 && events.ctrlKey === true) ||
// Allow: home, end, left, right
(events.keyCode >= 35 && events.keyCode <= 39)) {
// let it happen, don't do anything
return;
} else {
// Ensure that it is a number and stop the keypress
if (events.shiftKey || (events.keyCode < 48 || events.keyCode > 57) && (events.keyCode < 96 || events.keyCode > 105 )) {
events.preventDefault();
}
}
}
http://jsfiddle.net/Qxtnd/

The problem of decimals is because you are using
rightHalf >= 3
which evaluates the actual number & not it's length, because javascript type-casts it to a number for the comparison. What you want instead is the number of digits, try
rightHalf.toString().length >= 2
Fiddle here http://jsfiddle.net/Qxtnd/1/
Edit
As long as rightHalf is a string you can do:
rightHalf.length >= 2
if rightHalf was a number you would get an exception doing that.

function isNumberKeyUp(event, obj, beforeLength, afterLength) {
var text = document.getElementById(obj).value;
var splitText = text.split('.');
if (splitText.length > 1 && splitText[1].length > afterLength) {
document.getElementById(obj).value = splitText[0] + "." + splitText[1].substring(0,2);
return false;
}
return true;
}
function isNumberKey(event, obj,beforeLength,afterLength) {
var keyCode1 = event.keyCode;
var keyCode = 0;
if (keyCode1 == 0)
keyCode = event.which;
else {
keyCode = keyCode1;
}
if ((keyCode >= 48 && keyCode <= 57) || keyCode == 46 || keyCode == 13 || keyCode == 27 || keyCode == 127 ) {
var text = document.getElementById(obj).value;
if (keyCode == 46 && keyCode1 == 0) {
if (text.toString().indexOf(".") != -1) {
return false;
}
}
if (keyCode == 46) {
if (text.toString().indexOf(".") != -1) {
return false;
}
}
var splitText = text.split('.');
if (splitText[0].length >= beforeLength) {
if (keyCode == 46 && text.toString().indexOf(".") == -1) {
return true;
} else if (text.toString().indexOf(".") != -1)
{
return true;
}
return false;
}
}
else {
return GetDefault(event);
}
return true;
}
function GetDefault(event) {
var keyCode = event.keyCode;
if (keyCode == 0)
keyCode = event.which;
if (keyCode == 8 || keyCode == 9 || keyCode == 35 || keyCode == 36 || keyCode == 37 || keyCode == 38 || keyCode == 39 || keyCode == 40 || keyCode == 46 || keyCode == 118) {
return true;
}
return false;
}
Below is the html to call this events
<input type="text" onkeyup="return isNumberKeyUp(event,'txtID',9,2);" onkeypress="return isNumberKey(event,'txtID',9,2);" required="required" id="txtID" maxlength="12" value="1.00" name="txtID">

Here's the FIDDLE
rightHalf.length >= 2

$('#money-button-input-box').keyup(function () {
$(this).val(FormatNumber($(this).val()));
});
function FormatNumber(val){
var split = val.split('.');
if (split.length>1) return OnlyNumbersAllowed(split[0])+'.'+OnlyNumbersAllowed(split[1]);
else return OnlyNumbersAllowed(split[0]);
}
function OnlyNumbersAllowed(val){
return val.replace(/\D/g, '');
}
http://jsfiddle.net/Qxtnd/7/
You could easly put this regex in any function, instead of writing what you have now.