jQuery - Cannot retrieve Input Number value [duplicate]

Question

<input id='nb' name="nb" type="number" placeholder="Number"/>

jQuery.val() returns the value if there are only numbers, but empty if there is any letter.

Chrome shows the input number arrows (and they work), but I can type letters too.. Weird thing

BTW on mozilla and IE8 it becomes a normal input text (guess I have an old mozilla)

Any idea ? Couldn't find anything on jQuery doc specific to number inputs with .val()

Answer 1

Suggestion for input type="text" instead HTML5 input input type="number":

//HTML

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

//JAVASCRIPT (JQUERY NEEDED)

function onlyNumbers(evt) {
    // SOME OPTIONS LIKE ENTER, BACKSPACE, HOME, END, ARROWS, ETC.
    var arrayExceptions = [8, 13, 16, 17, 18, 20, 27, 35, 36, 37,
        38, 39, 40, 45, 46, 144];
    if ((evt.keyCode < 48 || evt.keyCode > 57) &&
            (evt.keyCode < 96 || evt.keyCode > 106) && // NUMPAD
            $.inArray(evt.keyCode, arrayExceptions) === -1) {
        return false;
    }
}

$('#inp').on('keydown', onlyNumbers);

//JAVASCRIPT (WITHOUT JQUERY)

function inArray(value, arr) {
    for(var i = 0; i < arr.length; i++) {
        if (value === arr[i]) {
            return i;
        }
    }
    return -1;
}

function onlyNumbers(evt) {
    // SOME OPTIONS LIKE ENTER, BACKSPACE, HOME, END, ARROWS, ETC.
    var arrayExceptions = [8, 13, 16, 17, 18, 20, 27, 35, 36, 37,
        38, 39, 40, 45, 46, 144];
    if ((evt.keyCode < 48 || evt.keyCode > 57) &&
            (evt.keyCode < 96 || evt.keyCode > 106) && // NUMPAD
              inArray(evt.keyCode, arrayExceptions) === -1) {
        return false;
    }
}

document.getElementById('inp').onkeydown = onlyNumbers;

As I said in my comment, until HTML5 becomes an standard web language that we can work with it properly, I prefer to use this.

Demo with jQuery
Demo without jQuery

Answer 2

If you want to get only numbers from input then you need to use regular expressions. Initially get the value from input using $(your_element).val() then use regular expressions.

Here is a running example. Hope it helps.