Number input type that takes only integers?

Question

I'm using the jQuery Tools Validator which implements HTML5 validations through jQuery.

It's been working great so far except for one thing. In the HTML5 specification, the input type "number" can have both integers and floating-point numbers.

This seems incredibly short-sighted since it will only be a useful validator when your database fields are signed floating-point numbers (for unsigned ints you'll have to fall back to pattern validation and thus lose extra features like the up and down arrows for browsers that support it).

Is there another input type or perhaps an attribute that would restrict the input to just unsigned integers?

I couldn't find any.

---

Setting the step to 1 is not the answer since it doesn't restrict the input. You can still type a negative floating-point number into the textbox.

Also, I am aware of pattern validation (I mentioned it in my original post), but that was not part of the question.

I wanted to know if HTML5 allowed restricting an input of type "number" to positive integer values. To this question the answer, it seems, would be "no, it does not".

I didn't want to use pattern validation because this causes some drawbacks when using jQuery Tools validation, but it now seems that the specification doesn't allow for a cleaner way to do this.

Answer 1

The best you can achieve with HTML only (documentation):

<input type="number" min="0" step="1"/>

Answer 2

Set the step attribute to 1:

<input type="number" step="1" />

This seems a bit buggy in Chrome right now so it might not be the best solution at the moment.

A better solution is to use the pattern attribute, that uses a regular expression to match the input:

<input type="text" pattern="\d*" />

\d is the regular expression for a number, * means that it accepts more than one of them.

Answer 3

<input type="text" name="PhoneNumber" pattern="[0-9]{10}" title="Phone number">

Using this code, the input to the text field limits to enter only digits. Pattern is the new attribute available in HTML 5.

Pattern attribute doc

Answer 4

The easy way using JavaScript:

<input type="text" oninput="this.value = this.value.replace(/[^0-9.]/g, ''); this.value = this.value.replace(/(\..*)\./g, '$1');" >

Answer 5

Pattern is nice but if you want to restrict the input to numbers only with type="text", you can use oninput and a regex as below:

<input type="text" oninput="this.value=this.value.replace(/[^0-9]/g,'');" id="myId"/>

I warks for me :)

Answer 6

<input type="number" oninput="this.value = Math.round(this.value);"/>

Answer 7

This is not only for HTML5. This works fine in all browsers. Try this:

document.getElementById("input").addEventListener("keyup", function() {
  this.value = this.value.replace(/[^0-9]/g, "");
});

<input id="input" type="text">

Answer 8

Pattern are always preferable for restriction, try oninput and min occur 1 for inputting only numbers from 1 onwards

<input type="text" min="1" oninput="this.value=this.value.replace(/[^0-9]/g,'');"
                                value=${var} >

Answer 9

Shortest

This is size improvement of R. Yaghoobi answer

<input type="number" oninput="this.value|=0"/>

We use here standard shorthand for "OR" operator e.g 9 | 2 = 11 in binary: 0b1001 | 0b1010 = 0b1011 . This operator first cast numbers to integers in implicit way and then do OR. But because OR with zero don't change anything so number is cast to integer. OR with non-number string gives 0.

Answer 10

Just putting it in your input field : onkeypress='return event.charCode >= 48 && event.charCode <= 57'

Answer 11

This is an old question, but the accessible (and now supported in most browsers) version would be:

<input type="text" inputmode="numeric" pattern="[0-9]*">

See https://technology.blog.gov.uk/2020/02/24/why-the-gov-uk-design-system-team-changed-the-input-type-for-numbers/

Answer 12

Set step attribute to any float number, e.g. 0.01 and you are good to go.

Answer 13

I was working oh Chrome and had some problems, even though I use html attributes. I ended up with this js code

$("#element").on("input", function(){
        var value = $(this).val();

        $(this).val("");
        $(this).val(parseInt(value));

        return true;
});

Answer 14

Maybe it does not fit every use case, but

<input type="range" min="0" max="10" />

can do a fine job: fiddle.

Check the documentation.

Answer 15

have you tried setting the step attribute to 1 like this

<input type="number" step="1" /> 

Answer 16

Yes, HTML5 does. Try this code (w3school):

<!DOCTYPE html>
<html>
<body>

<form action="">
  Quantity (between 1 and 5): <input type="number" name="quantity" min="1" max="5" />
  <input type="submit" />
</form>

</body>
</html>

See the min and max paremeter? I tried it using Chrome 19 (worked) and Firefox 12 (did not work).

Answer 17

Set step="any" . Works fine. Reference :http://blog.isotoma.com/2012/03/html5-input-typenumber-and-decimalsfloats-in-chrome/

Answer 18

Currently, it is not possible to prevent a user from writing decimal values in your input with HTML only. You have to use javascript.

Answer 19

var valKeyDown;
var valKeyUp;


function integerOnly(e) {
    e = e || window.event;
    var code = e.which || e.keyCode;
    if (!e.ctrlKey) {
        var arrIntCodes1 = new Array(96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 8, 9, 116);   // 96 TO 105 - 0 TO 9 (Numpad)
        if (!e.shiftKey) {                          //48 to 57 - 0 to 9 
            arrIntCodes1.push(48);                  //These keys will be allowed only if shift key is NOT pressed
            arrIntCodes1.push(49);                  //Because, with shift key (48 to 57) events will print chars like @,#,$,%,^, etc.
            arrIntCodes1.push(50);
            arrIntCodes1.push(51);
            arrIntCodes1.push(52);
            arrIntCodes1.push(53);
            arrIntCodes1.push(54);
            arrIntCodes1.push(55);
            arrIntCodes1.push(56);
            arrIntCodes1.push(57);
        }
        var arrIntCodes2 = new Array(35, 36, 37, 38, 39, 40, 46);
        if ($.inArray(e.keyCode, arrIntCodes2) != -1) {
            arrIntCodes1.push(e.keyCode);
        }
        if ($.inArray(code, arrIntCodes1) == -1) {
            return false;
        }
    }
    return true;
}

$('.integerOnly').keydown(function (event) {
    valKeyDown = this.value;
    return integerOnly(event);
});

$('.integerOnly').keyup(function (event) {          //This is to protect if user copy-pastes some character value ,..
    valKeyUp = this.value;                          //In that case, pasted text is replaced with old value,
    if (!new RegExp('^[0-9]*$').test(valKeyUp)) {   //which is stored in 'valKeyDown' at keydown event.
        $(this).val(valKeyDown);                    //It is not possible to check this inside 'integerOnly' function as,
    }                                               //one cannot get the text printed by keydown event 
});                                                 //(that's why, this is checked on keyup)

$('.integerOnly').bind('input propertychange', function(e) {    //if user copy-pastes some character value using mouse
    valKeyUp = this.value;
    if (!new RegExp('^[0-9]*$').test(valKeyUp)) {
        $(this).val(valKeyDown);
    }
});

Answer 20

Posting it, if anyone requires it in future

const negativeValuePrevent = (e) => {
    const charCode = e.which ? e.which : e.keyCode;
    if(charCode > 31 && (charCode < 48 || charCode > 57) 
    && charCode !== 46){
      if(charCode < 96 || charCode > 105){
        e.preventDefault();
        return false;
      }
    }
    return true;
  };

Answer 21

From the specs

step="any" or positive floating-point number
Specifies the value granularity of the element’s value.

So you could simply set it to 1:

Answer 22

Short and user friendly

This solution supports tab, backspace, enter, minus in intuitive way

<input type=text onkeypress="return /^-?[0-9]*$/.test(this.value+event.key)">

however it not allow to change already typed number to minus and not handle copy-paste case.

As alternative you can use solution based on R. Yaghoobi answer which allow to put minus and handle copy-paste case, but it delete whole number when user type forbidden character

<input type=text oninput="this.value= ['','-'].includes(this.value) ? this.value : this.value|0">

NOTE: above inline solutions use only in small projects. In other case opaque them in functions and move to your js files.

Answer 23

The integer input would mean that it can only take positive numbers, 0 and negative numbers too. This is how I have been able to achieve this using Javascript keypress.

<input type="number" (keypress)="keypress($event, $event.target.value)" >

keypress(evt, value){
  
    if (evt.charCode >= 48 && evt.charCode <= 57 || (value=="" && evt.charCode == 45))       
    {  
      return true;
    }
    return false;
}

The given code won't allow user to enter alphabets nor decimal on runtime, just positive and negative integer values.

Answer 24

In the Future™ (see Can I Use), on user agents that present a keyboard to you, you can restrict a text input to just numeric with input[inputmode].