Performing Arithmetic on Currency Values in the form of Text using Javascript

I am using JQ开发者_C百科uery to get the contents of a div, which only contains a price in dollars and I would like to add $99 to it, but its text, so when I do the below it won't work.

$('#price_' + part[0]).text($('#price_' + part[0]).text() + 99);
//Changes the div contents to $10099 - if it the contents was $100 to start with

So the question is how can I add the numeric values?

Thanks all

Edit

Please note some numbers can contain a comma i.e. $1,200

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Get numerical substring and cast it to a number:

$('#price_' + part[0]).text("$" + (+($('#price_' + part[0]).text()).substring(1) + 99)); 

Note the use of the unary + operator to cast the string into a number, and the use of substring to get everything after the 1st ($) character in the string.

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UPDATE

Since you mentioned the value can contain a comma, you'll be better off breaking this down a bit and performing a string replace:

var div    = $('#price_' + part[0]);  // get a ref to the div

// replace occurrences of `$` or `,`, cast to a number and add 99
var amount = +div.text().replace(/[$,]/g, '') + 99;

// set the new text to the div
div.text("$" + amount);

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Something like this should work

 var str = $(...).text();
 var sum = parseInt(str.replace(/\D/g, ""));
 $(...).text("$" + (sum + 99))

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Use parseInt:

var price = $('#price_' + part[0]);
price.text(parseInt(price.text()) + 99);

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You'll have to convert the text to int/float before doing the arithmatic

$('#price_' + part[0]).text( parseInt( $('#price_' + part[0]).text() ) + 99);

parseFloat in place of parseInt if you need/want.