ngNumber - Simple and powerful directive for allow only numbers on text input.

ngNumber.js

/**
*   How to use it?
*       You only need set 'ng-number' attribute on you input like
            Example:
*               <input ng-model="myModel" ng-number>
*
*   How to integrate?
*       You need copy this code and paste after you module definition on you Angular app.
*           Example:
*               module('controllers', [])
*               .directive('ngNumber', ...)
*               .controller('myCtrl', ...)
*
*   Support
*       This directive can support next key:
*           Numbers and only one dot:
*               0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and .(dot)
*           Special:
*               backspace(remove), left arrow, right arrow, tab
*           Windows Combinations:
*               ctrl+v ctrl+c ctrl+a ctrl+x
*           OSX Combinations:
*               cmd+v cmd+c cmd+a cmd+x
*           Events:
*               Copy, Paste, Cut, Input(keydown, keypress and keyup)
*
*   Formats:
*       Example:
*           0 (integer)
*           0.1 (float/double/decimal)
*/
.directive('ngNumber', function () {
    return function (scope, element) {
        element.bind('keydown',function (event) {
            var keys=[37,38,39,40,8,9,13,186,20,16,17,18,27,229,32,48,49,50,51,52,53,54,55,56,57,190];
            event.which == 190 && element.val().trim().indexOf('.') > -1 && event.preventDefault();
            event.which == 190 && element.val().trim().length == 0 && event.preventDefault();
            if (navigator.platform.indexOf('mac')) event.metaKey === true && [86,65,67,88].indexOf(event.which) == -1 && event.preventDefault()
            else if (navigator.platform.indexOf('win')) event.ctrlKey === true && [86,65,67,88].indexOf(event.which) == -1 && event.preventDefault()
            else keys.indexOf(event.which) < 0 && event.preventDefault();
        });
        element.bind('input', function(event){
            var value = element.val().trim().replace(/[^\d\.]+/g,'').replace( /^([^.]*\.)(.*)$/, function ( a, b, c ) {
                return b + c.replace( /\./g, '' );
            }).replace(/^0([\d]+)$/, '$1')
            element.val (value)
        })
    }
})