Prevent decimal place being entered into input field on mobile

Question

I have this javascript code, which, on desktop browsers works well to ensure the user can only enter characters 1 to 9.

However when testing in Chrome on Android, the keypad presented includes dash and period characters which the field accepts. How can I prevent this?

    function isNumberKey(evt) {
        var charCode = (evt.which) ? evt.which : evt.keyCode;
        if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
        return true;
    }

UPDATE:

This is how I am using the function in HTML:

  <input type="number" class="form-control" 
         onkeypress="return isNumberKey(event)" />

I have another function to prevent being able to copy and paste non numeric chars into the code.

    $(document).ready(function() {
        $('#number').bind("cut copy paste drag drop", function(e) {
            e.preventDefault();
        });     
    });

And if all else fails, there's server-side validation.

I really want to stop decimal places being possible on the front end. Remember the character range I specified restricts this fine on a qwerty keyboard - however on android (and probably others) the number key pad allows entering . and -

Answer 1

One possible solution:

 <script> function onlyNumbers(num){ if ( /[^0-9]+/.test(num.value) ){ num.value = num.value.replace(/[^0-9]*/g,"") } } </script> <input type="text" onkeyup="onlyNumbers(this)">

Answer 2

尝试使用 HTML 属性 min 和 max 来设置数字的范围，并使用 type=number 来只允许数字。

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