How to extract decimal number from string using JavaScript

Question

I want to extract decimal number 265.12 or 0.0 from alphanumeric string (say amount) having value $265.12+ or $265.12- or $0.0+ or $0.0- and use it apply struts logic tag in JSP. Not sure how to extract number maybe with help of JavaScript.

Adil · Answer 1 · 2013-04-12T17:10:16.707

31

You can use regex like this,

Live Demo

var amount = "$265.12+";
var doublenumber = Number(amount.replace(/[^0-9\.]+/g,""));

edited Apr 12 '13 at 17:10

answered May 02 '12 at 10:25

Adil

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score 12 · Answer 2 · answered May 02 '12 at 10:27

12

Without error checks, following will do:

var string = "$123123.0980soigfusofui"
var number = parseFloat(string.match(/[\d\.]+/))

123123.098

answered May 02 '12 at 10:27

Oleg V. Volkov

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1

I believe the regex can be shortened to `/[\d.]+/` - stumbled upon that in JS – Reece Daniels Jun 10 '20 at 22:58

score 0 · Answer 3 · answered May 02 '12 at 10:38

Try this also,

<script type="text/javascript">
function validate(){
    var amount =  $("#amount").val();
    alert(amount.split(".")[1]);
} </script>
</head> 
<body>
<input type="hidden" name="amount" id="amount" value="25.50">
<input type="submit" onclick="validate();">

score -1 · Answer 4 · answered May 02 '12 at 10:28

-1

You might be interested in this library for formatting money http://josscrowcroft.github.com/accounting.js/

answered May 02 '12 at 10:28

250R

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How could he when he needs to extract, not print? – Oleg V. Volkov May 02 '12 at 12:29
there's a method called unformat() that returns number. E.g. accounting.unformat("$ 12,345,678.90"); // 12345678.9 – 250R May 02 '12 at 12:44

score -1 · Answer 5 · answered Oct 29 '15 at 18:06

A more elegant solution and also a method to avoid the 0.7700000004 javascript math do this:

var num = 15.3354; Number(String(num).substr(String(num).indexOf('.')+1));

The result will always be the exact number of decimals. Also a prototype for easier use

Number.prototype.getDecimals = function () { return Number(String(this).substr(String(this).indexOf('.')+1)); }

so now just 15.6655.getDecimals() ==> 6655

score -2 · Answer 6 · answered May 02 '12 at 10:32

-2

use :

var str = parseFloat("$265.12".match(/[\d\.]+/))
alert(str % 1); => 0.12000000000000455

answered May 02 '12 at 10:32

swati

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How to extract decimal number from string using JavaScript

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