Develop Reference

issue with eventlistner keypress

I've an event listner so for some keys it does some thing different and so on, first if not working pressing "-" does not trigger the commands written but other two works perfectly!
second one submits as soon as entering Enter and third one denies anything other than numbers.
what could be the issue with first one?
document.querySelector(".header__input").addEventListener("keypress", function (evt) {
if (evt.keyCode === 109 || evt.which === 109 || evt.keyCode === 189 || evt.which === 189){
operation = "-";
alert("sucecss")
}
else if (evt.keyCode === 13 || evt.which === 13){
starter();
}
else if (evt.which < 48 || evt.which > 57)
{
evt.preventDefault();
}
});

I'm not sure exactly why you're having a problem on the subtract symbol. However, I should point out that keypress is deprecated. Mozilla docs
I suggest using keydown. Like this:
var x = document;
x.addEventListener('keydown', function (evt) {
if (evt.keyCode === 109 || evt.which === 109 || evt.keyCode === 189 || evt.which === 189) {
operation = "-";
alert("sucecss")
}
else if (evt.keyCode === 13 || evt.which === 13) {
starter();
}
else if (evt.which < 48 || evt.which > 57) {
evt.preventDefault();
}
})

doing some tweaking was able to fix the numpad issue with keydown.
thanks to jacob.
document.querySelector(".header__input").addEventListener("keydown", function (evt) {
if (evt.keyCode === 13 || evt.which === 13){
starter();
}
else if (evt.which < 48 || evt.which > 57 && event.which < 97){
evt.preventDefault();
}
else if (evt.which > 105){
if(evt.keyCode === 109 || evt.which === 109 || evt.keyCode === 189 || evt.which === 189){
operation = "-";
}
else{
evt.preventDefault();
}
}
});

restricting zero is not working for popup

Hi I want to restrict zero and dot for a field and it is working, But when the field is in pop up then the below code is not working.
<script>
$('#name').keypress(function(e){
if (this.selectionStart == 0 && e.which == 48 || this.selectionStart == 0 && e.which == 46 ){
return false;
}
});
</script>

Since your modal's DOM is generated dynamically on click event, $('.abc').keypress doesn't bind to it (because the modal's DOM doesn't exist yet).
You could make use of event bubbling in such cases. In your case, you could declare the event handler like:
$(document).on('keypress', '.abc', function(e){
if (this.selectionStart == 0 && (e.which == 48 || e.which == 46) ){
return false;
}
});
This means all keypress events on an element with .abc will bubble up to the document, and the event handler will be triggered.
Here's the updated fiddle: http://jsfiddle.net/hcyj3q6q/398/

You are attaching click event on dynamically inserted element. For this
So instead of...
$(document).keypress('.abc', function(e){
if (this.selectionStart == 0 && (e.which == 48 || e.which == 46) ){
return false;
}
});
You can write...
$(document).on('keypress', '.abc', function(e){
if (this.selectionStart == 0 && (e.which == 48 || e.which == 46) ){
return false;
}
});
See this to know more How to add event on dynamically inserted HTML

you can try like this(Javascript)
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (charCode == 48 || charCode == 46
)
return false;
return true;
}
here I have created a fiddle https://jsfiddle.net/vinothsm92/8qde7gnk/2/

How to get the character (.) full stop which is 190 on the keycode chart to be included in the allowable keys?

The code below works, but I am not able to get 190 as a part of the keys that can be allowed. The ultimate objective is to get the user to only be able to input (0-9) and a decimal point (.).
function isNumber(evt) {
evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (evt.which != 8 && evt.which != 0
&& (evt.which < 48 || evt.which > 57)
&& evt.charCode != 190) {
return false;
}
return true;
}

As you can see on this site http://www.asquare.net/javascript/tests/KeyCode.html the returned char code differs from onKeyDown, onKeyPress and onKeyUp.
EDIT:
Added working example of this with jquery, but it should be the same for javascripts nativ keypress event.
// with jQuery
function isNumber(evt) {
evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (evt.which != 8 && evt.which != 0
&& (evt.which < 48 || evt.which > 57)
&& evt.charCode != 46 // IMPORTANT keypress charCode 46 == ".", String.fromCharCode(46) -> "."
) {
return false;
}
return true;
}
$("input").keypress(function(e) {
if (isNumber(e)) {
result = "Is a number";
} else {
result = "Is not a number";
}
console.log(result);
$("#result").html(result);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text">
<div id="result">result</div>

Cross Browser issue with Keyup Validation

<script type="text/javascript">
function numbersonly(e){
var unicode=e.charCode? e.charCode : e.keyCode
if (unicode!=8){ //if the key isn't the backspace key (which we should allow)
if (unicode<65||unicode>90) //if not a Capital Alphabet
return false //disable key press
}
}
</script>
<form>
<input type="text" size=18 onkeyup="return numbersonly(event)">
</form>
This code is working fine. But IE doesn't support charcode. and In Keycode, 65 to 90 range includes both capital and lower case letters. How to resolve the issue?

It will not handled by the simple one you have to check many conditions in that case like,
Checking caps lock on or not
Use this function for this,
function isCapslock(e){
e = (e) ? e : window.event;
var charCode = false;
if (e.which) {
charCode = e.which;
} else if (e.keyCode) {
charCode = e.keyCode;
}
var shifton = false;
if (e.shiftKey) {
shifton = e.shiftKey;
} else if (e.modifiers) {
shifton = !!(e.modifiers & 4);
}
if (charCode >= 97 && charCode <= 122 && shifton) {
return true;
}
if (charCode >= 65 && charCode <= 90 && !shifton) {
return true;
}
return false;
}
Refered from http://dougalmatthews.com/articles/2008/jul/2/javascript-detecting-caps-lock/
Additionally
just use e.which in jquery. They normalize this value for all browsers.
Additionally you can check for e.shiftKey.
Source Using e.keyCode || e.which; how to determine the differance between lowercase and uppercase?

JavaScript keycode allow number and plus symbol only

I have this JavaScript function that is used to force user only type number in the textbox. Right now and I want to modify this function so it will allow the user to enter plus (+) symbol. How to achieve this?
//To only enable digit in the user input
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}

Since the '+' symbol's decimal ASCII code is 43, you can add it to your condition.
for example :
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode != 43 && charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
This way, the Plus symbol is allowed.

This code might work. I added support for SHIFT + (equal sign) and the numpad +.
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode;
var shiftPressed = (window.Event) ? e.modifiers & Event.SHIFT_MASK : e.shiftKey;
if ((shiftPressed && charCode == 187) || (charCode == 107))
{
return true;
} else if ((charCode > 95) && (charCode < 106)) {
return true;
} else if (charCode > 31 && (charCode < 48 || charCode > 57))) {
return false;
} else {
return true;
}
}

this is stupid ... not really an answer at all. I would suggest you to do following.
function isNumberKey(evt)
{
console.log(evt.keyCode);
return false;
}
And find out the ranges of all keys, and implement it.

It's Work. Javascript keycode allow number and plus symbol only
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript form validation</title>
</head>
<body>
<form name="form1" action="#">
Mobile Number: <input type='text' id='PhoneNumber' maxlength="10" onKeyPress="return IsNumeric3(event);" ondrop="return false;" onpaste="return false;"/>
<span id="error3" style="color: Red; display: none">* Input digits (0 - 9)</span>
</form>
<script type="text/javascript">
var specialKeys = new Array();
specialKeys.push(8);
specialKeys.push(43);
specialKeys.push(37);
specialKeys.push(39);
//Backspace
function IsNumeric3(e) {
var keyCode = e.which ? e.which : e.keyCode
var ret = (keyCode != 37 && keyCode != 8 && keyCode != 46 && (keyCode >= 48 && keyCode <= 57) || specialKeys.indexOf(keyCode) != -1);
document.getElementById("error3").style.display = ret ? "none" : "inline";
return ret;
}
</script>
<script>
function stringlength(inputtxt, minlength, maxlength)
{
var field = inputtxt.value;
var mnlen = minlength;
var mxlen = maxlength;
if(field.length<mnlen || field.length> mxlen)
{
alert("Please input the 10 digit mobile number");
return false;
}
else
{
return true;
}
}
</script>
</body>
</html>
Thank you friends

Here is the modified code:
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if ( (charCode >= 48 && charCode <= 57) || charCode == 43)
return true;
return false;
}

Here is the code . working fine with numbers and plus + sign in phone fields. you will have to implement the code on keydown function . target the id/class of the particular phone field and use keydown function.
//allows only these keys
// backspace, delete, tab, escape, and enter
if ( event.keyCode == 107 || event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 ||
// Ctrl+A
(event.keyCode == 65 && event.ctrlKey === true) ||
// home, end, left, right
(event.keyCode >= 35 && event.keyCode <= 39)) {
return;
}
else {
// 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();
}
}

Using experience of my colleagues above, write one function, that fits me well. It filters all except numbers, arrows and backspace. Maybe it would be useful for somebody.
function isKeyCorrect(keyEvent) {
var charCode = keyEvent.which ? keyEvent.which : keyEvent.keyCode;
var isNotNumber = charCode < 48 || charCode > 57;
var isNotArrow = charCode < 37 || charCode > 40;
var isNotBackspace = charCode !== 8;
return isNotNumber && isNotArrow && isNotBackspace;
}

<script type="text/javascript">
$(document).ready(function() {
`enter code here` $('#form-1').submit(function(msg) {
$.post("action.php?act=login",$(this).serialize(),function(data){
if (data == 'ERR:A3001004') { alert("Güvenlik hatası, sayfayı yenileyin."); }
else if (data == 'TIMEEND') { alert("Anahtarınızın süresi dolmuş."); }
else if (data == 'INVALID') { alert("Geçersiz anahtar şifresi girdiniz."); }
else if (data == 'OK') { alert("Başarıyla giriş yaptınız. Yetişkinlere göre içerik barındıran sitelere erişim sağlayabilirsiniz."); }
});
return false;
});
});
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
</script>