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// Extend the default Number object with a formatMoney() method: // usage: someVar.formatMoney(decimalPlaces, symbol, thousandsSeparator, decimalSeparator) // defaults: (2, "$", ",", ".") Number.prototype.formatMoney = function (places, symbol, thousand, decimal) { places = !isNaN(places = Math.abs(places)) ? places : 2; symbol = symbol !== undefined "; thousand = thousand || ","; decimal = decimal || "."; var number = this, negative = number < 0 ", i = parseInt(number = Math.abs(+number || 0).toFixed(places), 10) + "", j = (j = i.length) > 3 ? j % 3 : 0; return symbol + negative + (j ? i.substr(0, j) + thousand : "") + i.substr(j).replace(/(d{3})(" + thousand) + (places ? decimal + Math.abs(number - i).toFixed(places).slice(2) : ""); };

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// Default usage and custom precision/symbol : var revenue = 12345678; alert(revenue.formatMoney()); // $12,345,678.00 alert(revenue.formatMoney(0, "HK$ ")); // HK$ 12,345,678 // European formatting: var price = 4999.99; alert(price.formatMoney(2, "€", ".", ",")); // €4.999,99 // It works for negative values, too: alert((-500000).formatMoney(0, "£ ")); // £ -500,000

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var price = (12345.99).formatMoney(); // "$12,345.99" // Remove non-numeric chars (except decimal point/minus sign): priceVal = parseFloat(price.replace(/[^0-9-.]/g, '')); // 12345.99

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// To set it up as a global function: function formatMoney(number, places, symbol, thousand, decimal) { number = number || 0; places = !isNaN(places = Math.abs(places)) ? places : 2; symbol = symbol !== undefined "; thousand = thousand || ","; decimal = decimal || "."; var negative = number < 0 ", i = parseInt(number = Math.abs(+number || 0).toFixed(places), 10) + "", j = (j = i.length) > 3 ? j % 3 : 0; return symbol + negative + (j ? i.substr(0, j) + thousand : "") + i.substr(j).replace(/(d{3})(" + thousand) + (places ? decimal + Math.abs(number - i).toFixed(places).slice(2) : ""); } // To create it as a library method: myLibrary.formatMoney = function (number, places, symbol, thousand, decimal) { /* as above */ } // Example usage: formatMoney(54321); // $54,321 myLibrary.formatMoney(12345, 0, "£ "); // £ 12,345

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