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.
How to extract decimal number from string using JavaScript
Asked Answered
You can use regex like this,
var amount = "$265.12+";
var doublenumber = Number(amount.replace(/[^0-9\.]+/g,""));
Without error checks, following will do:
var string = "$123123.0980soigfusofui"
var number = parseFloat(string.match(/[\d\.]+/))
123123.098
Try this also,
<script type="text/javascript">
function validate(){
var amount = $("#amount").val();
alert(amount.split(".")[1]);
} </script>
</head>
<body>
<input type="hidden" name="amount" id="amount" value="25.50">
<input type="submit" onclick="validate();">
A more elegant solution and also a method to avoid the 0.7700000004 javascript math do this:
var num = 15.3354;
Number(String(num).substr(String(num).indexOf('.')+1));
The result will always be the exact number of decimals. Also a prototype for easier use
Number.prototype.getDecimals = function () {
return Number(String(this).substr(String(this).indexOf('.')+1));
}
so now just 15.6655.getDecimals() ==> 6655
You might be interested in this library for formatting money http://josscrowcroft.github.com/accounting.js/
How could he when he needs to extract, not print? –
Vest
there's a method called unformat() that returns number. E.g. accounting.unformat("$ 12,345,678.90"); // 12345678.9 –
Lesialesion
use :
var str = parseFloat("$265.12".match(/[\d\.]+/))
alert(str % 1); => 0.12000000000000455
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