In jQuery, what's the best way of formatting a number to 2 decimal places?

If you're doing this to several fields, or doing it quite often, then perhaps a plugin is the answer.
Here's the beginnings of a jQuery plugin that formats the value of a field to two decimal places.
It is triggered by the onchange event of the field. You may want something different.

<script type="text/javascript">    // mini jQuery plugin that formats to two decimal places    (function($) {        $.fn.currencyFormat = function() {            this.each( function( i ) {                $(this).change( function( e ){                    if( isNaN( parseFloat( this.value ) ) ) return;                    this.value = parseFloat(this.value).toFixed(2);                });            });            return this; //for chaining        }    })( jQuery );    // apply the currencyFormat behaviour to elements with 'currency' as their class    $( function() {        $('.currency').currencyFormat();    });</script>   <input type="text" name="one" class="currency"><br><input type="text" name="two" class="currency">

Maybe something like this, where you could select more than one element if you'd like?

$("#number").each(function(){    $(this).val(parseFloat($(this).val()).toFixed(2));});

We modify a Meouw function to be used with keyup, because when you are using an input it can be more helpful.

Check this:

Hey there!, @heridev and I created a small function in jQuery.

You can try next:

HTML

<input type="text" name="one" class="two-digits"><br><input type="text" name="two" class="two-digits">​

jQuery

// apply the two-digits behaviour to elements with 'two-digits' as their class$( function() {    $('.two-digits').keyup(function(){        if($(this).val().indexOf('.')!=-1){                     if($(this).val().split(".")[1].length > 2){                                if( isNaN( parseFloat( this.value ) ) ) return;                this.value = parseFloat(this.value).toFixed(2);            }           }                     return this; //for chaining    });});

​DEMO ONLINE:

http://jsfiddle.net/c4Wqn/

(@heridev, @vicmaster)