How do I make a textbox entry an integer in jQuery and Javascript?

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How do I make: "var id1 = $("#text1").val();" an integer in jQuery and Javascript?

C#

$(function () {
    $("#btn1").click(function () {
        var id1 = $("#text1").val();
    });
});

Posted 26-Feb-15 2:05am

teledexterus

Updated 26-Feb-15 2:10am

v2

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Comments

Pradip R 26-Feb-15 8:10am

You mean you want to allow only integer values in textbox only?

enhzflep 26-Feb-15 8:15am

Any reason to use a text input - <input type='text'/> instead of a number input - <input type='number' /> ?
Using a number input does the work for you and gives you increment/decrement buttons too. You can also make use of the min and max attributes of a number input to limit its range.

teledexterus 26-Feb-15 8:25am

<input type=text> always returns a string. How do you get an integer in jQuery?

enhzflep 26-Feb-15 8:35am

By using <input type='number'/> or by following Member10004231's suggestion and making use of ParseInt.
e.g
var numString = "10";
var num = ParseInt(numString);


<!DOCTYPE html>
<html>
<head>
<script>
"use strict";
function byId(e){return document.getElementById(e);}

window.addEventListener('load', onDocLoaded, false);

function onDocLoaded()
{
	byId('dblBtn').addEventListener('click', onDblBtnClick, false);
}

function onDblBtnClick(evt)
{
	var val = byId('numInput').value * 2;
	alert(val);
}
</script>
<style>
</style>
</head>
<body>
	<input type='number' min='0' max='10' value='5' id='numInput'/><button id='dblBtn'>x 2</button>
</body>
</html>

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Laxmi Saini · Accepted Answer · 2015-02-26T02:24:00

Solution 1

use parseInt() to convert the value in integer.
example:
var intValue=parseInt(id1);

Posted 26-Feb-15 2:24am

Laxmi Saini