How to make HTML input tag only accept numerical values?
HtmlInputNumbersValidatingHtml Problem Overview
I need to make sure that a certain <input> field only takes numbers as value.
The input is not part of a form. Hence it doesn't get submitted, so validating during submission is not an option. I want the user to be unable to type in any characters other than numbers.
Is there a neat way to achieve this?
Html Solutions
Solution 1 - Html
HTML 5
You can use HTML5 input type number to restrict only number entries:
<input type="number" name="someid" />
This will work only in HTML5 complaint browser. Make sure your html document's doctype is:
<!DOCTYPE html>
See also https://github.com/jonstipe/number-polyfill for transparent support in older browsers.
JavaScript
Update: There is a new and very simple solution for this:
> It allows you to use any kind of input filter on a text <input>,
> including various numeric filters. This will correctly handle
> Copy+Paste, Drag+Drop, keyboard shortcuts, context menu operations,
> non-typeable keys, and all keyboard layouts.
See this answer or try it yourself on JSFiddle.
For general purpose, you can have JS validation as below:
function isNumberKey(evt){
var charCode = (evt.which) ? evt.which : evt.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
<input name="someid" type="number" onkeypress="return isNumberKey(event)"/>
If you want to allow decimals replace the "if condition" with this:
if (charCode > 31 && (charCode != 46 &&(charCode < 48 || charCode > 57)))
Source: https://stackoverflow.com/questions/469357/html-text-input-allow-only-numeric-input
JSFiddle demo: http://jsfiddle.net/viralpatel/nSjy7/
Solution 2 - Html
You can also use the pattern attribute in html5:
<input type="text" name="name" pattern="[0-9]" title="Title" />
Although, if your doctype isn't html then I think you'll need to use some javascript/jquery.
Solution 3 - Html
Quick and Easy Code
<input type="text" onkeypress="return (event.charCode !=8 && event.charCode ==0 || (event.charCode >= 48 && event.charCode <= 57))" />
This will permit usage of numbers and backspace only.
If you need decimal part too, use this code fragment
<input type="text" onkeypress="return (event.charCode !=8 && event.charCode ==0 || ( event.charCode == 46 || (event.charCode >= 48 && event.charCode <= 57)))" />
Solution 4 - Html
Please try this code along with the input field itself
<input type="text" name="price" id="price_per_ticket" class="calculator-input" onkeypress="return event.charCode >= 48 && event.charCode <= 57"></div>
it will work fine.
Solution 5 - Html
You can use an <input type="number" />. This will only allow numbers to be entered into othe input box.
Example: http://jsfiddle.net/SPqY3/
Please note that the input type="number" tag is only supported in newer browsers.
For firefox, you can validate the input by using javascript:
Update 2018-03-12: Browser support is much better now it's supported by the following:
- Chrome 6+
- Firefox 29+
- Opera 10.1+
- Safari 5+
- Edge
- (Internet Explorer 10+)
Solution 6 - Html
You can use following one line code as :
<input type="text" onkeypress="return /[0-9]/i.test(event.key)" >
It will accept numbers ony.
Solution 7 - Html
<input type="text" name="myinput" id="myinput" onkeypress="return isNumber(event);" />
and in the js:
function isNumber(e){
e = e || window.event;
var charCode = e.which ? e.which : e.keyCode;
return /\d/.test(String.fromCharCode(charCode));
}
or you can write it in a complicated bu useful way:
<input onkeypress="return /\d/.test(String.fromCharCode(((event||window.event).which||(event||window.event).which)));" type="text" name="myinput" id="myinput" />
Note:cross-browser and regex in literal.
Solution 8 - Html
I have used regular expression to replace the input value with the pattern needed.
var userName = document.querySelector('#numberField');
userName.addEventListener('input', restrictNumber);
function restrictNumber (e) {
var newValue = this.value.replace(new RegExp(/[^\d]/,'ig'), "");
this.value = newValue;
}
<input type="text" id="numberField">
Solution 9 - Html
function AllowOnlyNumbers(e) {
e = (e) ? e : window.event;
var clipboardData = e.clipboardData ? e.clipboardData : window.clipboardData;
var key = e.keyCode ? e.keyCode : e.which ? e.which : e.charCode;
var str = (e.type && e.type == "paste") ? clipboardData.getData('Text') : String.fromCharCode(key);
return (/^\d+$/.test(str));
}
<h1>Integer Textbox</h1>
<input type="text" autocomplete="off" id="txtIdNum" onkeypress="return AllowOnlyNumbers(event);" />
JSFiddle: https://jsfiddle.net/ug8pvysc/
Solution 10 - Html
You can use the <input> tag with attribute type='number'.
For example you can use <input type='number' />
This input field allows only numerical values. You can also specify the minimum value and maximum value that should be accepted by this field.
Solution 11 - Html
<input
onkeyup="value=isNaN(parseFloat(value))?1000:value"
type="number"
value="1000"
>
onkeyup triggers when the key is released.
isNaN(parseFloat(value))? checks if the input value is not a number.
If it is not a number the value is set to 1000 : If it is a number the value is set to the value.
note: For some reason it only works with type="number"
To make it even more exiting, you can also have a boundary:
<input
onkeyup="value=isNaN(parseFloat(value))||value<0||value>9000?1000:value"
type="number"
value="1000"
>
Enjoy!
Solution 12 - Html
I fought with this one for a bit. Many solutions here and elsewhere seemed complicated. This solution uses jQuery/javascript alongside HTML.
<input type="number" min="1" class="validateNumber">
$(document).on('change', '.validateNumber', function() {
var abc = parseInt($(this).val());
if(isNaN(abc)) { abc = 1; }
$(this).val(abc);
});
In my case I was tracking small quantities with a minimum value of 1, hence the min="1" in the input tag and abc = 1 in the isNaN() check. For positive only numbers you could change those values to 0 and even simply remove the min="1" from the input tag to allow for negative numbers.
Also this works for multiple boxes (and could save you some load time over doing them individually by id), just add the "validateNumber" class where needed.
Explanation
parseInt() basically does what you need, except that it returns NaN rather than some integer value. With a simple if() you can set the "fallback" value that you prefer in all the cases NaN is returned :-). Also W3 states here that the global version of NaN will type cast before checking which gives some extra proofing (Number.isNaN() does not do that). Any values sent to a server/backend should still be validated there!
Solution 13 - Html
Simple enough?
inputField.addEventListener('input', function () {
if ((inputField.value/inputField.value) !== 1) {
console.log("Please enter a number");
}
});
<input id="inputField" type="text">
Solution 14 - Html
How about using <input type="number"...>?
http://www.w3schools.com/tags/tag_input.asp
Also, here is a question that has some examples of using Javascript for validation.
Update: linked to better question (thanks alexblum).
Solution 15 - Html
if you can use HTML5 you can do <input type="number" />
If not you will have to either do it through javascript as you said it doesnt get submited to do it from codebehind.
<input id="numbersOnly" onkeypress='validate()' />
function validate(){
var returnString;
var text = document.getElementByID('numbersOnly').value;
var regex = /[0-9]|\./;
var anArray = text.split('');
for(var i=0; i<anArray.length; i++){
if(!regex.test(anArray[i]))
{
anArray[i] = '';
}
}
for(var i=0; i<anArray.length; i++) {
returnString += anArray[i];
}
document.getElementByID('numbersOnly').value = returnString;
}
P.S didnt test the code but it should be more or less correct if not check for typos :D You might wanna add a few more things like what to do if the string is null or empty etc. Also you could make this quicker :D
Solution 16 - Html
I use this for Zip Codes, quick and easy.
<input type="text" id="zip_code" name="zip_code" onkeypress="return event.charCode > 47 && event.charCode < 58;" pattern="[0-9]{5}" required></input>
Solution 17 - Html
The accepted answer:
function isNumberKey(evt){
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}
It's good but not perfect. It works out for me, but i get a warning that the if-statement can be simplified.
Then it looks like this, which is way prettier:
function isNumberKey(evt){
var charCode = (evt.which) ? evt.which : event.keyCode;
return !(charCode > 31 && (charCode < 48 || charCode > 57));
}
Would comment the original post, but my reputation is too low to do so (just created this account).
Solution 18 - Html
Add inside your input tag: onkeyup="value=value.replace(/[^\d]/g,'')"
Solution 19 - Html
if not integer set 0
<input type="text" id="min-value" />
$('#min-value').change(function ()
{
var checkvalue = $('#min-value').val();
if (checkvalue != parseInt(checkvalue))
$('#min-value').val(0);
});
Solution 20 - Html
Please see my project of the cross-browser filter of value of the text input element on your web page using JavaScript language: Input Key Filter . You can filter the value as an integer number, a float number, or write a custom filter, such as a phone number filter. See an example of code of input an integer number:
<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Input Key Filter Test</title>
<meta name="author" content="Andrej Hristoliubov [email protected]">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<!-- For compatibility of IE browser with audio element in the beep() function.
https://www.modern.ie/en-us/performance/how-to-use-x-ua-compatible -->
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<link rel="stylesheet" href="https://rawgit.com/anhr/InputKeyFilter/master/InputKeyFilter.css" type="text/css">
<script type="text/javascript" src="https://rawgit.com/anhr/InputKeyFilter/master/Common.js"></script>
<script type="text/javascript" src="https://rawgit.com/anhr/InputKeyFilter/master/InputKeyFilter.js"></script>
</head>
<body>
<h1>Integer field</h1>
<input id="Integer">
<script>
CreateIntFilter("Integer", function(event){//onChange event
inputKeyFilter.RemoveMyTooltip();
var elementNewInteger = document.getElementById("NewInteger");
var integer = parseInt(this.value);
if(inputKeyFilter.isNaN(integer, this)){
elementNewInteger.innerHTML = "";
return;
}
//elementNewInteger.innerText = integer;//Uncompatible with FireFox
elementNewInteger.innerHTML = integer;
}
//onblur event. Use this function if you want set focus to the input element again if input value is NaN. (empty or invalid)
, function(event){ inputKeyFilter.isNaN(parseInt(this.value), this); }
);
</script>
New integer: <span id="NewInteger"></span>
</body>
</html>
Also see my page "Integer field:" of the example of the input key filter
Solution 21 - Html
I updated some answers posted to add the following:
-
Add the method as extension method
-
Allow only one point to be entered
-
Specify how many numbers after the decimal point is allowed.
String.prototype.isDecimal = function isDecimal(evt,decimalPts) { debugger; var charCode = (evt.which) ? evt.which : event.keyCode if (charCode > 31 && (charCode != 46 && (charCode < 48 || charCode > 57))) return false; //Prevent more than one point if (charCode == 46 && this.includes(".")) return false; // Restrict the needed decimal digits if (this.includes(".")) { var number = []; number = this.split("."); if (number[1].length == decimalPts) return false; } return true; };
Solution 22 - Html
When using this code you cant use "BackSpace Button" in Mozilla Firefox you can only use backspace in Chrome
Solution 23 - Html
http://www.texotela.co.uk/code/jquery/numeric/ numeric input credits to Leo Vũ for mentioning this and of course TexoTela. with a test page.
Solution 24 - Html
For general purpose, you can have JS validation as below:
It will work for Numeric keypad and normal number key's
function isNumberKey(evt){
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode < 31 || (charCode >= 48 && charCode <= 57 ) || (charCode >= 96 && charCode <= 105 ))
return true;
return false;
}
<input name="someid" type="number" onkeypress="return isNumberKey(event)"/>
Solution 25 - Html
Yet another method that works pretty well.
<input type="text" name="celular" placeholder="Ej. 6756892" maxlength="8" id="telefono" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');" >
What's great about this fix is that copy-pasted values are also included in the rule.
Solution 26 - Html
You can use it by one line
<input onkeypress="return /[0-9]/i.test(event.key)" >
Solution 27 - Html
It's better to add "+" to REGEX condition in order to accept multiple digits (not only one digit):
<input type="text" name="your_field" pattern="[0-9]+">
Solution 28 - Html
One way could be to have an array of allowed character codes and then use the Array.includes function to see if entered character is allowed.
Example:
<input type="text" onkeypress="return [45, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57].includes(event.charCode);"/>
Solution 29 - Html
Use <input type="number">, it only accepts inputs that are numbers.
Try submitting the two forms below with non number values.
<form>
<!-- some code -->
<input type="number">
<button>SUBMIT</button>
</form>
Older browsers don’t support type=number. So we can validate it with JavaScript:
<form onsubmit=
"if (isNaN(document.getElementById('validatethis').value)) return false;">
<!-- some code -->
<input type="text" id="validatethis">
<button>SUBMIT</button>
</form>
Solution 30 - Html
The accepted answer is already good, however if your requirement is that you would like your user to be able to navigate their input (by using either the left or right cursor keys) and possibly amend their input (by using either the delete or the backspace key on the keyboard), you may choose to use this method.
Another benefit of this method is that accepts numbers from both the top row of the keyboard in addition to numbers from the numeric keypad.
The input HTML element will look something like this...
<input type="number"
onkeydown="return validateIsNumericInput(event)"
...
any other attributes for the input element
>
The JavaScript function will look like this:
/**
Checks the ASCII code input by the user is one of the following:
- Between 48 and 57: Numbers along the top row of the keyboard
- Between 96 and 105: Numbers in the numeric keypad
- Either 8 or 46: The backspace and delete keys enabling user to change their input
- Either 37 or 39: The left and right cursor keys enabling user to navigate their input
*/
function validateIsNumericInput(evt) {
var ASCIICode = (evt.which) ? evt.which : evt.keyCode
permittedKeys = [8, 46, 37, 39]
if ((ASCIICode >= 48 && ASCIICode <= 57) || (ASCIICode >= 96 && ASCIICode <= 105)) {
return true;
};
if (permittedKeys.includes(ASCIICode)) {
return true;
};
return false;
}
Solution 31 - Html
From my understanding, you want to only allow numerical values in a text input box. I also struggled with this logic as I am a beginner. This problem can be simply solved in ES6.Here is the most simplest solution I came up with:
function test(){
for (var i = 0; i < document.getElementById("element").value.length; i++) {
if (isNaN(document.getElementById("element").value[i])){
document.getElementById("element").value = '';
console.log(document.getElementById("element").value[i])
}
};
}
Please note that this code does not work for floating-point-numbers!