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ASP.NET MVC controller action with Interceptor pattern

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2 Oct 2012CPOL8 min read 67.4K   924   24  
This article is to demonstrate interceptor pattern with MVC controller action, and so action can be intercepted in controller classes without using action filters.
/*!
* Note: While Microsoft is not the author of this file, Microsoft is
* offering you a license subject to the terms of the Microsoft Software
* License Terms for Microsoft ASP.NET Model View Controller 3.
* Microsoft reserves all other rights. The notices below are provided
* for informational purposes only and are not the license terms under
* which Microsoft distributed this file.
*
* Modernizr v1.7
* http://www.modernizr.com
*
* Developed by: 
* - Faruk Ates  http://farukat.es/
* - Paul Irish  http://paulirish.com/
*
* Copyright (c) 2009-2011
*/

 
/*
 * Modernizr is a script that detects native CSS3 and HTML5 features
 * available in the current UA and provides an object containing all
 * features with a true/false value, depending on whether the UA has
 * native support for it or not.
 * 
 * Modernizr will also add classes to the <html> element of the page,
 * one for each feature it detects. If the UA supports it, a class
 * like "cssgradients" will be added. If not, the class name will be
 * "no-cssgradients". This allows for simple if-conditionals in your
 * CSS, giving you fine control over the look & feel of your website.
 * 
 * @author        Faruk Ates
 * @author        Paul Irish
 * @copyright     (c) 2009-2011 Faruk Ates.
 * @contributor   Ben Alman
 */

window.Modernizr = (function(window,document,undefined){
    
    var version = '1.7',

    ret = {},

    /**
     * !! DEPRECATED !!
     * 
     * enableHTML5 is a private property for advanced use only. If enabled,
     * it will make Modernizr.init() run through a brief while() loop in
     * which it will create all HTML5 elements in the DOM to allow for
     * styling them in Internet Explorer, which does not recognize any
     * non-HTML4 elements unless created in the DOM this way.
     * 
     * enableHTML5 is ON by default.
     * 
     * The enableHTML5 toggle option is DEPRECATED as per 1.6, and will be
     * replaced in 2.0 in lieu of the modular, configurable nature of 2.0.
     */
    enableHTML5 = true,
    
    
    docElement = document.documentElement,
    docHead = document.head || document.getElementsByTagName('head')[0],

    /**
     * Create our "modernizr" element that we do most feature tests on.
     */
    mod = 'modernizr',
    modElem = document.createElement( mod ),
    m_style = modElem.style,

    /**
     * Create the input element for various Web Forms feature tests.
     */
    inputElem = document.createElement( 'input' ),
    
    smile = ':)',
    
    tostring = Object.prototype.toString,
    
    // List of property values to set for css tests. See ticket #21
    prefixes = ' -webkit- -moz- -o- -ms- -khtml- '.split(' '),

    // Following spec is to expose vendor-specific style properties as:
    //   elem.style.WebkitBorderRadius
    // and the following would be incorrect:
    //   elem.style.webkitBorderRadius
    
    // Webkit ghosts their properties in lowercase but Opera & Moz do not.
    // Microsoft foregoes prefixes entirely <= IE8, but appears to 
    //   use a lowercase `ms` instead of the correct `Ms` in IE9
    
    // More here: http://github.com/Modernizr/Modernizr/issues/issue/21
    domPrefixes = 'Webkit Moz O ms Khtml'.split(' '),

    ns = {'svg': 'http://www.w3.org/2000/svg'},

    tests = {},
    inputs = {},
    attrs = {},
    
    classes = [],
    
    featurename, // used in testing loop
    
    
    
    // todo: consider using http://javascript.nwbox.com/CSSSupport/css-support.js instead
    testMediaQuery = function(mq){

      var st = document.createElement('style'),
          div = document.createElement('div'),
          ret;

      st.textContent = mq + '{#modernizr{height:3px}}';
      docHead.appendChild(st);
      div.id = 'modernizr';
      docElement.appendChild(div);

      ret = div.offsetHeight === 3;

      st.parentNode.removeChild(st);
      div.parentNode.removeChild(div);

      return !!ret;

    },
    
    
    /**
      * isEventSupported determines if a given element supports the given event
      * function from http://yura.thinkweb2.com/isEventSupported/
      */
    isEventSupported = (function(){

      var TAGNAMES = {
        'select':'input','change':'input',
        'submit':'form','reset':'form',
        'error':'img','load':'img','abort':'img'
      };

      function isEventSupported(eventName, element) {

        element = element || document.createElement(TAGNAMES[eventName] || 'div');
        eventName = 'on' + eventName;

        // When using `setAttribute`, IE skips "unload", WebKit skips "unload" and "resize", whereas `in` "catches" those
        var isSupported = (eventName in element);

        if (!isSupported) {
          // If it has no `setAttribute` (i.e. doesn't implement Node interface), try generic element
          if (!element.setAttribute) {
            element = document.createElement('div');
          }
          if (element.setAttribute && element.removeAttribute) {
            element.setAttribute(eventName, '');
            isSupported = is(element[eventName], 'function');

            // If property was created, "remove it" (by setting value to `undefined`)
            if (!is(element[eventName], undefined)) {
              element[eventName] = undefined;
            }
            element.removeAttribute(eventName);
          }
        }

        element = null;
        return isSupported;
      }
      return isEventSupported;
    })();
    
    
    // hasOwnProperty shim by kangax needed for Safari 2.0 support
    var _hasOwnProperty = ({}).hasOwnProperty, hasOwnProperty;
    if (!is(_hasOwnProperty, undefined) && !is(_hasOwnProperty.call, undefined)) {
      hasOwnProperty = function (object, property) {
        return _hasOwnProperty.call(object, property);
      };
    }
    else {
      hasOwnProperty = function (object, property) { /* yes, this can give false positives/negatives, but most of the time we don't care about those */
        return ((property in object) && is(object.constructor.prototype[property], undefined));
      };
    }
    
    /**
     * set_css applies given styles to the Modernizr DOM node.
     */
    function set_css( str ) {
        m_style.cssText = str;
    }

    /**
     * set_css_all extrapolates all vendor-specific css strings.
     */
    function set_css_all( str1, str2 ) {
        return set_css(prefixes.join(str1 + ';') + ( str2 || '' ));
    }

    /**
     * is returns a boolean for if typeof obj is exactly type.
     */
    function is( obj, type ) {
        return typeof obj === type;
    }

    /**
     * contains returns a boolean for if substr is found within str.
     */
    function contains( str, substr ) {
        return (''+str).indexOf( substr ) !== -1;
    }

    /**
     * test_props is a generic CSS / DOM property test; if a browser supports
     *   a certain property, it won't return undefined for it.
     *   A supported CSS property returns empty string when its not yet set.
     */
    function test_props( props, callback ) {
        for ( var i in props ) {
            if ( m_style[ props[i] ] !== undefined && ( !callback || callback( props[i], modElem ) ) ) {
                return true;
            }
        }
    }

    /**
     * test_props_all tests a list of DOM properties we want to check against.
     *   We specify literally ALL possible (known and/or likely) properties on 
     *   the element including the non-vendor prefixed one, for forward-
     *   compatibility.
     */
    function test_props_all( prop, callback ) {
      
        var uc_prop = prop.charAt(0).toUpperCase() + prop.substr(1),
            props   = (prop + ' ' + domPrefixes.join(uc_prop + ' ') + uc_prop).split(' ');

        return !!test_props( props, callback );
    }
    

    /**
     * Tests
     * -----
     */

    tests['flexbox'] = function() {
        /**
         * set_prefixed_value_css sets the property of a specified element
         * adding vendor prefixes to the VALUE of the property.
         * @param {Element} element
         * @param {string} property The property name. This will not be prefixed.
         * @param {string} value The value of the property. This WILL be prefixed.
         * @param {string=} extra Additional CSS to append unmodified to the end of
         * the CSS string.
         */
        function set_prefixed_value_css(element, property, value, extra) {
            property += ':';
            element.style.cssText = (property + prefixes.join(value + ';' + property)).slice(0, -property.length) + (extra || '');
        }

        /**
         * set_prefixed_property_css sets the property of a specified element
         * adding vendor prefixes to the NAME of the property.
         * @param {Element} element
         * @param {string} property The property name. This WILL be prefixed.
         * @param {string} value The value of the property. This will not be prefixed.
         * @param {string=} extra Additional CSS to append unmodified to the end of
         * the CSS string.
         */
        function set_prefixed_property_css(element, property, value, extra) {
            element.style.cssText = prefixes.join(property + ':' + value + ';') + (extra || '');
        }

        var c = document.createElement('div'),
            elem = document.createElement('div');

        set_prefixed_value_css(c, 'display', 'box', 'width:42px;padding:0;');
        set_prefixed_property_css(elem, 'box-flex', '1', 'width:10px;');

        c.appendChild(elem);
        docElement.appendChild(c);

        var ret = elem.offsetWidth === 42;

        c.removeChild(elem);
        docElement.removeChild(c);

        return ret;
    };
    
    // On the S60 and BB Storm, getContext exists, but always returns undefined
    // http://github.com/Modernizr/Modernizr/issues/issue/97/ 
    
    tests['canvas'] = function() {
        var elem = document.createElement( 'canvas' );
        return !!(elem.getContext && elem.getContext('2d'));
    };
    
    tests['canvastext'] = function() {
        return !!(ret['canvas'] && is(document.createElement( 'canvas' ).getContext('2d').fillText, 'function'));
    };
    
    // This WebGL test false positives in FF depending on graphics hardware. But really it's quite impossible to know
    // wether webgl will succeed until after you create the context. You might have hardware that can support
    // a 100x100 webgl canvas, but will not support a 1000x1000 webgl canvas. So this feature inference is weak, 
    // but intentionally so.
    tests['webgl'] = function(){
        return !!window.WebGLRenderingContext;
    };
    
    /*
     * The Modernizr.touch test only indicates if the browser supports
     *    touch events, which does not necessarily reflect a touchscreen
     *    device, as evidenced by tablets running Windows 7 or, alas,
     *    the Palm Pre / WebOS (touch) phones.
     *    
     * Additionally, Chrome (desktop) used to lie about its support on this,
     *    but that has since been rectified: http://crbug.com/36415
     *    
     * We also test for Firefox 4 Multitouch Support.
     *
     * For more info, see: http://modernizr.github.com/Modernizr/touch.html
     */
     
    tests['touch'] = function() {

        return ('ontouchstart' in window) || testMediaQuery('@media ('+prefixes.join('touch-enabled),(')+'modernizr)');

    };


    /**
     * geolocation tests for the new Geolocation API specification.
     *   This test is a standards compliant-only test; for more complete
     *   testing, including a Google Gears fallback, please see:
     *   http://code.google.com/p/geo-location-javascript/
     * or view a fallback solution using google's geo API:
     *   http://gist.github.com/366184
     */
    tests['geolocation'] = function() {
        return !!navigator.geolocation;
    };

    // Per 1.6: 
    // This used to be Modernizr.crosswindowmessaging but the longer
    // name has been deprecated in favor of a shorter and property-matching one.
    // The old API is still available in 1.6, but as of 2.0 will throw a warning,
    // and in the first release thereafter disappear entirely.
    tests['postmessage'] = function() {
      return !!window.postMessage;
    };

    // Web SQL database detection is tricky:

    // In chrome incognito mode, openDatabase is truthy, but using it will 
    //   throw an exception: http://crbug.com/42380
    // We can create a dummy database, but there is no way to delete it afterwards. 
    
    // Meanwhile, Safari users can get prompted on any database creation.
    //   If they do, any page with Modernizr will give them a prompt:
    //   http://github.com/Modernizr/Modernizr/issues/closed#issue/113
    
    // We have chosen to allow the Chrome incognito false positive, so that Modernizr
    //   doesn't litter the web with these test databases. As a developer, you'll have
    //   to account for this gotcha yourself.
    tests['websqldatabase'] = function() {
      var result = !!window.openDatabase;
      /*  if (result){
            try {
              result = !!openDatabase( mod + "testdb", "1.0", mod + "testdb", 2e4);
            } catch(e) {
            }
          }  */
      return result;
    };
    
    // Vendors have inconsistent prefixing with the experimental Indexed DB:
    // - Firefox is shipping indexedDB in FF4 as moz_indexedDB
    // - Webkit's implementation is accessible through webkitIndexedDB
    // We test both styles.
    tests['indexedDB'] = function(){
      for (var i = -1, len = domPrefixes.length; ++i < len; ){ 
        var prefix = domPrefixes[i].toLowerCase();
        if (window[prefix + '_indexedDB'] || window[prefix + 'IndexedDB']){
          return true;
        } 
      }
      return false;
    };

    // documentMode logic from YUI to filter out IE8 Compat Mode
    //   which false positives.
    tests['hashchange'] = function() {
      return isEventSupported('hashchange', window) && ( document.documentMode === undefined || document.documentMode > 7 );
    };

    // Per 1.6: 
    // This used to be Modernizr.historymanagement but the longer
    // name has been deprecated in favor of a shorter and property-matching one.
    // The old API is still available in 1.6, but as of 2.0 will throw a warning,
    // and in the first release thereafter disappear entirely.
    tests['history'] = function() {
      return !!(window.history && history.pushState);
    };

    tests['draganddrop'] = function() {
        return isEventSupported('dragstart') && isEventSupported('drop');
    };
    
    tests['websockets'] = function(){
        return ('WebSocket' in window);
    };
    
    
    // http://css-tricks.com/rgba-browser-support/
    tests['rgba'] = function() {
        // Set an rgba() color and check the returned value
        
        set_css(  'background-color:rgba(150,255,150,.5)' );
        
        return contains( m_style.backgroundColor, 'rgba' );
    };
    
    tests['hsla'] = function() {
        // Same as rgba(), in fact, browsers re-map hsla() to rgba() internally,
        //   except IE9 who retains it as hsla
        
        set_css('background-color:hsla(120,40%,100%,.5)' );
        
        return contains( m_style.backgroundColor, 'rgba' ) || contains( m_style.backgroundColor, 'hsla' );
    };
    
    tests['multiplebgs'] = function() {
        // Setting multiple images AND a color on the background shorthand property
        //  and then querying the style.background property value for the number of
        //  occurrences of "url(" is a reliable method for detecting ACTUAL support for this!
        
        set_css( 'background:url(//:),url(//:),red url(//:)' );
        
        // If the UA supports multiple backgrounds, there should be three occurrences
        //   of the string "url(" in the return value for elem_style.background

        return new RegExp("(url\\s*\\(.*?){3}").test(m_style.background);
    };
    
    
    // In testing support for a given CSS property, it's legit to test:
    //    `elem.style[styleName] !== undefined`
    // If the property is supported it will return an empty string,
    // if unsupported it will return undefined.
    
    // We'll take advantage of this quick test and skip setting a style 
    // on our modernizr element, but instead just testing undefined vs
    // empty string.
    

    tests['backgroundsize'] = function() {
        return test_props_all( 'backgroundSize' );
    };
    
    tests['borderimage'] = function() {
        return test_props_all( 'borderImage' );
    };
    
    
    // Super comprehensive table about all the unique implementations of 
    // border-radius: http://muddledramblings.com/table-of-css3-border-radius-compliance
    
    tests['borderradius'] = function() {
        return test_props_all( 'borderRadius', '', function( prop ) {
            return contains( prop, 'orderRadius' );
        });
    };
    
    // WebOS unfortunately false positives on this test.
    tests['boxshadow'] = function() {
        return test_props_all( 'boxShadow' );
    };
    
    // FF3.0 will false positive on this test 
    tests['textshadow'] = function(){
        return document.createElement('div').style.textShadow === '';
    };
    
    
    tests['opacity'] = function() {
        // Browsers that actually have CSS Opacity implemented have done so
        //  according to spec, which means their return values are within the
        //  range of [0.0,1.0] - including the leading zero.
        
        set_css_all( 'opacity:.55' );
        
        // The non-literal . in this regex is intentional:
        //   German Chrome returns this value as 0,55
        // https://github.com/Modernizr/Modernizr/issues/#issue/59/comment/516632
        return /^0.55$/.test(m_style.opacity);
    };
    
    
    tests['cssanimations'] = function() {
        return test_props_all( 'animationName' );
    };
    
    
    tests['csscolumns'] = function() {
        return test_props_all( 'columnCount' );
    };
    
    
    tests['cssgradients'] = function() {
        /**
         * For CSS Gradients syntax, please see:
         * http://webkit.org/blog/175/introducing-css-gradients/
         * https://developer.mozilla.org/en/CSS/-moz-linear-gradient
         * https://developer.mozilla.org/en/CSS/-moz-radial-gradient
         * http://dev.w3.org/csswg/css3-images/#gradients-
         */
        
        var str1 = 'background-image:',
            str2 = 'gradient(linear,left top,right bottom,from(#9f9),to(white));',
            str3 = 'linear-gradient(left top,#9f9, white);';
        
        set_css(
            (str1 + prefixes.join(str2 + str1) + prefixes.join(str3 + str1)).slice(0,-str1.length)
        );
        
        return contains( m_style.backgroundImage, 'gradient' );
    };
    
    
    tests['cssreflections'] = function() {
        return test_props_all( 'boxReflect' );
    };
    
    
    tests['csstransforms'] = function() {
        return !!test_props([ 'transformProperty', 'WebkitTransform', 'MozTransform', 'OTransform', 'msTransform' ]);
    };
    
    
    tests['csstransforms3d'] = function() {
        
        var ret = !!test_props([ 'perspectiveProperty', 'WebkitPerspective', 'MozPerspective', 'OPerspective', 'msPerspective' ]);
        
        // Webkit’s 3D transforms are passed off to the browser's own graphics renderer.
        //   It works fine in Safari on Leopard and Snow Leopard, but not in Chrome in
        //   some conditions. As a result, Webkit typically recognizes the syntax but 
        //   will sometimes throw a false positive, thus we must do a more thorough check:
        if (ret && 'webkitPerspective' in docElement.style){
          
          // Webkit allows this media query to succeed only if the feature is enabled.    
          // `@media (transform-3d),(-o-transform-3d),(-moz-transform-3d),(-ms-transform-3d),(-webkit-transform-3d),(modernizr){ ... }`    
          ret = testMediaQuery('@media ('+prefixes.join('transform-3d),(')+'modernizr)');
        }
        return ret;
    };
    
    
    tests['csstransitions'] = function() {
        return test_props_all( 'transitionProperty' );
    };


    // @font-face detection routine by Diego Perini
    // http://javascript.nwbox.com/CSSSupport/
    tests['fontface'] = function(){

        var 
        sheet, bool,
        head = docHead || docElement,
        style = document.createElement("style"),
        impl = document.implementation || { hasFeature: function() { return false; } };
        
        style.type = 'text/css';
        head.insertBefore(style, head.firstChild);
        sheet = style.sheet || style.styleSheet;

        var supportAtRule = impl.hasFeature('CSS2', '') ?
                function(rule) {
                    if (!(sheet && rule)) return false;
                    var result = false;
                    try {
                        sheet.insertRule(rule, 0);
                        result = (/src/i).test(sheet.cssRules[0].cssText);
                        sheet.deleteRule(sheet.cssRules.length - 1);
                    } catch(e) { }
                    return result;
                } :
                function(rule) {
                    if (!(sheet && rule)) return false;
                    sheet.cssText = rule;
                    
                    return sheet.cssText.length !== 0 && (/src/i).test(sheet.cssText) &&
                      sheet.cssText
                            .replace(/\r+|\n+/g, '')
                            .indexOf(rule.split(' ')[0]) === 0;
                };
        
        bool = supportAtRule('@font-face { font-family: "font"; src: url(data:,); }');
        head.removeChild(style);
        return bool;
    };
    

    // These tests evaluate support of the video/audio elements, as well as
    // testing what types of content they support.
    //
    // We're using the Boolean constructor here, so that we can extend the value
    // e.g.  Modernizr.video     // true
    //       Modernizr.video.ogg // 'probably'
    //
    // Codec values from : http://github.com/NielsLeenheer/html5test/blob/9106a8/index.html#L845
    //                     thx to NielsLeenheer and zcorpan
    
    // Note: in FF 3.5.1 and 3.5.0, "no" was a return value instead of empty string.
    //   Modernizr does not normalize for that.
    
    tests['video'] = function() {
        var elem = document.createElement('video'),
            bool = !!elem.canPlayType;
        
        if (bool){  
            bool      = new Boolean(bool);  
            bool.ogg  = elem.canPlayType('video/ogg; codecs="theora"');
            
            // Workaround required for IE9, which doesn't report video support without audio codec specified.
            //   bug 599718 @ msft connect
            var h264 = 'video/mp4; codecs="avc1.42E01E';
            bool.h264 = elem.canPlayType(h264 + '"') || elem.canPlayType(h264 + ', mp4a.40.2"');
            
            bool.webm = elem.canPlayType('video/webm; codecs="vp8, vorbis"');
        }
        return bool;
    };
    
    tests['audio'] = function() {
        var elem = document.createElement('audio'),
            bool = !!elem.canPlayType;
        
        if (bool){  
            bool      = new Boolean(bool);  
            bool.ogg  = elem.canPlayType('audio/ogg; codecs="vorbis"');
            bool.mp3  = elem.canPlayType('audio/mpeg;');
            
            // Mimetypes accepted: 
            //   https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
            //   http://bit.ly/iphoneoscodecs
            bool.wav  = elem.canPlayType('audio/wav; codecs="1"');
            bool.m4a  = elem.canPlayType('audio/x-m4a;') || elem.canPlayType('audio/aac;');
        }
        return bool;
    };


    // Firefox has made these tests rather unfun.

    // In FF4, if disabled, window.localStorage should === null.

    // Normally, we could not test that directly and need to do a 
    //   `('localStorage' in window) && ` test first because otherwise Firefox will
    //   throw http://bugzil.la/365772 if cookies are disabled

    // However, in Firefox 4 betas, if dom.storage.enabled == false, just mentioning
    //   the property will throw an exception. http://bugzil.la/599479
    // This looks to be fixed for FF4 Final.

    // Because we are forced to try/catch this, we'll go aggressive.

    // FWIW: IE8 Compat mode supports these features completely:
    //   http://www.quirksmode.org/dom/html5.html
    // But IE8 doesn't support either with local files

    tests['localstorage'] = function() {
        try {
            return !!localStorage.getItem;
        } catch(e) {
            return false;
        }
    };

    tests['sessionstorage'] = function() {
        try {
            return !!sessionStorage.getItem;
        } catch(e){
            return false;
        }
    };


    tests['webWorkers'] = function () {
        return !!window.Worker;
    };


    tests['applicationcache'] =  function() {
        return !!window.applicationCache;
    };

 
    // Thanks to Erik Dahlstrom
    tests['svg'] = function(){
        return !!document.createElementNS && !!document.createElementNS(ns.svg, "svg").createSVGRect;
    };

    tests['inlinesvg'] = function() {
      var div = document.createElement('div');
      div.innerHTML = '<svg/>';
      return (div.firstChild && div.firstChild.namespaceURI) == ns.svg;
    };

    // Thanks to F1lt3r and lucideer
    // http://github.com/Modernizr/Modernizr/issues#issue/35
    tests['smil'] = function(){
        return !!document.createElementNS && /SVG/.test(tostring.call(document.createElementNS(ns.svg,'animate')));
    };

    tests['svgclippaths'] = function(){
        // Possibly returns a false positive in Safari 3.2?
        return !!document.createElementNS && /SVG/.test(tostring.call(document.createElementNS(ns.svg,'clipPath')));
    };


    // input features and input types go directly onto the ret object, bypassing the tests loop.
    // Hold this guy to execute in a moment.
    function webforms(){
    
        // Run through HTML5's new input attributes to see if the UA understands any.
        // We're using f which is the <input> element created early on
        // Mike Taylr has created a comprehensive resource for testing these attributes
        //   when applied to all input types: 
        //   http://miketaylr.com/code/input-type-attr.html
        // spec: http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#input-type-attr-summary
        ret['input'] = (function(props) {
            for (var i = 0, len = props.length; i<len; i++) {
                attrs[ props[i] ] = !!(props[i] in inputElem);
            }
            return attrs;
        })('autocomplete autofocus list placeholder max min multiple pattern required step'.split(' '));

        // Run through HTML5's new input types to see if the UA understands any.
        //   This is put behind the tests runloop because it doesn't return a
        //   true/false like all the other tests; instead, it returns an object
        //   containing each input type with its corresponding true/false value 
        
        // Big thanks to @miketaylr for the html5 forms expertise. http://miketaylr.com/
        ret['inputtypes'] = (function(props) {
          
            for (var i = 0, bool, inputElemType, defaultView, len=props.length; i < len; i++) {
              
                inputElem.setAttribute('type', inputElemType = props[i]);
                bool = inputElem.type !== 'text';
                
                // We first check to see if the type we give it sticks.. 
                // If the type does, we feed it a textual value, which shouldn't be valid.
                // If the value doesn't stick, we know there's input sanitization which infers a custom UI
                if (bool){  
                  
                    inputElem.value         = smile;
                    inputElem.style.cssText = 'position:absolute;visibility:hidden;';
     
                    if (/^range$/.test(inputElemType) && inputElem.style.WebkitAppearance !== undefined){
                      
                      docElement.appendChild(inputElem);
                      defaultView = document.defaultView;
                      
                      // Safari 2-4 allows the smiley as a value, despite making a slider
                      bool =  defaultView.getComputedStyle && 
                              defaultView.getComputedStyle(inputElem, null).WebkitAppearance !== 'textfield' &&                  
                              // Mobile android web browser has false positive, so must
                              // check the height to see if the widget is actually there.
                              (inputElem.offsetHeight !== 0);
                              
                      docElement.removeChild(inputElem);
                              
                    } else if (/^(search|tel)$/.test(inputElemType)){
                      // Spec doesnt define any special parsing or detectable UI 
                      //   behaviors so we pass these through as true
                      
                      // Interestingly, opera fails the earlier test, so it doesn't
                      //  even make it here.
                      
                    } else if (/^(url|email)$/.test(inputElemType)) {
                      // Real url and email support comes with prebaked validation.
                      bool = inputElem.checkValidity && inputElem.checkValidity() === false;
                      
                    } else if (/^color$/.test(inputElemType)) {
                        // chuck into DOM and force reflow for Opera bug in 11.00
                        // github.com/Modernizr/Modernizr/issues#issue/159
                        docElement.appendChild(inputElem);
                        docElement.offsetWidth; 
                        bool = inputElem.value != smile;
                        docElement.removeChild(inputElem);

                    } else {
                      // If the upgraded input compontent rejects the :) text, we got a winner
                      bool = inputElem.value != smile;
                    }
                }
                
                inputs[ props[i] ] = !!bool;
            }
            return inputs;
        })('search tel url email datetime date month week time datetime-local number range color'.split(' '));

    }



    // End of test definitions
    // -----------------------



    // Run through all tests and detect their support in the current UA.
    // todo: hypothetically we could be doing an array of tests and use a basic loop here.
    for ( var feature in tests ) {
        if ( hasOwnProperty( tests, feature ) ) {
            // run the test, throw the return value into the Modernizr,
            //   then based on that boolean, define an appropriate className
            //   and push it into an array of classes we'll join later.
            featurename  = feature.toLowerCase();
            ret[ featurename ] = tests[ feature ]();

            classes.push( ( ret[ featurename ] ? '' : 'no-' ) + featurename );
        }
    }
    
    // input tests need to run.
    if (!ret.input) webforms();
    

   
    // Per 1.6: deprecated API is still accesible for now:
    ret.crosswindowmessaging = ret.postmessage;
    ret.historymanagement = ret.history;



    /**
     * Addtest allows the user to define their own feature tests
     * the result will be added onto the Modernizr object,
     * as well as an appropriate className set on the html element
     * 
     * @param feature - String naming the feature
     * @param test - Function returning true if feature is supported, false if not
     */
    ret.addTest = function (feature, test) {
      feature = feature.toLowerCase();
      
      if (ret[ feature ]) {
        return; // quit if you're trying to overwrite an existing test
      } 
      test = !!(test());
      docElement.className += ' ' + (test ? '' : 'no-') + feature; 
      ret[ feature ] = test;
      return ret; // allow chaining.
    };

    /**
     * Reset m.style.cssText to nothing to reduce memory footprint.
     */
    set_css( '' );
    modElem = inputElem = null;

    //>>BEGIN IEPP
    // Enable HTML 5 elements for styling in IE. 
    // fyi: jscript version does not reflect trident version
    //      therefore ie9 in ie7 mode will still have a jScript v.9
    if ( enableHTML5 && window.attachEvent && (function(){ var elem = document.createElement("div");
                                      elem.innerHTML = "<elem></elem>";
                                      return elem.childNodes.length !== 1; })()) {
        // iepp v1.6.2 by @jon_neal : code.google.com/p/ie-print-protector
        (function(win, doc) {
          var elems = 'abbr|article|aside|audio|canvas|details|figcaption|figure|footer|header|hgroup|mark|meter|nav|output|progress|section|summary|time|video',
            elemsArr = elems.split('|'),
            elemsArrLen = elemsArr.length,
            elemRegExp = new RegExp('(^|\\s)('+elems+')', 'gi'), 
            tagRegExp = new RegExp('<(\/*)('+elems+')', 'gi'),
            ruleRegExp = new RegExp('(^|[^\\n]*?\\s)('+elems+')([^\\n]*)({[\\n\\w\\W]*?})', 'gi'),
            docFrag = doc.createDocumentFragment(),
            html = doc.documentElement,
            head = html.firstChild,
            bodyElem = doc.createElement('body'),
            styleElem = doc.createElement('style'),
            body;
          function shim(doc) {
            var a = -1;
            while (++a < elemsArrLen)
              // Use createElement so IE allows HTML5-named elements in a document
              doc.createElement(elemsArr[a]);
          }
          function getCSS(styleSheetList, mediaType) {
            var a = -1,
              len = styleSheetList.length,
              styleSheet,
              cssTextArr = [];
            while (++a < len) {
              styleSheet = styleSheetList[a];
              // Get css from all non-screen stylesheets and their imports
              if ((mediaType = styleSheet.media || mediaType) != 'screen') cssTextArr.push(getCSS(styleSheet.imports, mediaType), styleSheet.cssText);
            }
            return cssTextArr.join('');
          }
          // Shim the document and iepp fragment
          shim(doc);
          shim(docFrag);
          // Add iepp custom print style element
          head.insertBefore(styleElem, head.firstChild);
          styleElem.media = 'print';
          win.attachEvent(
            'onbeforeprint',
            function() {
              var a = -1,
                cssText = getCSS(doc.styleSheets, 'all'),
                cssTextArr = [],
                rule;
              body = body || doc.body;
              // Get only rules which reference HTML5 elements by name
              while ((rule = ruleRegExp.exec(cssText)) != null)
                // Replace all html5 element references with iepp substitute classnames
                cssTextArr.push((rule[1]+rule[2]+rule[3]).replace(elemRegExp, '$1.iepp_$2')+rule[4]);
              // Write iepp custom print CSS
              styleElem.styleSheet.cssText = cssTextArr.join('\n');
              while (++a < elemsArrLen) {
                var nodeList = doc.getElementsByTagName(elemsArr[a]),
                  nodeListLen = nodeList.length,
                  b = -1;
                while (++b < nodeListLen)
                  if (nodeList[b].className.indexOf('iepp_') < 0)
                    // Append iepp substitute classnames to all html5 elements
                    nodeList[b].className += ' iepp_'+elemsArr[a];
              }
              docFrag.appendChild(body);
              html.appendChild(bodyElem);
              // Write iepp substitute print-safe document
              bodyElem.className = body.className;
              // Replace HTML5 elements with <font> which is print-safe and shouldn't conflict since it isn't part of html5
              bodyElem.innerHTML = body.innerHTML.replace(tagRegExp, '<$1font');
            }
          );
          win.attachEvent(
            'onafterprint',
            function() {
              // Undo everything done in onbeforeprint
              bodyElem.innerHTML = '';
              html.removeChild(bodyElem);
              html.appendChild(body);
              styleElem.styleSheet.cssText = '';
            }
          );
        })(window, document);
    }
    //>>END IEPP

    // Assign private properties to the return object with prefix
    ret._enableHTML5     = enableHTML5;
    ret._version         = version;

    // Remove "no-js" class from <html> element, if it exists:
    docElement.className = docElement.className.replace(/\bno-js\b/,'') 
                            + ' js '

                            // Add the new classes to the <html> element.
                            + classes.join( ' ' );
    
    return ret;

})(this,this.document);

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Written By
Technical Lead
India India
Like to dream on long drive and falling asleep on short drive..!

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