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Integrate matchMedia to get support for AddListener and RemoveListener.

Take advantage of response.js window.resize loop to add support for a
media query list using regex based engine.
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1 parent fd892e1 commit 699ab73bd94aa63d6646b14810ecd23554987524 @jameswestgate committed Feb 18, 2012
Showing with 369 additions and 320 deletions.
  1. +369 −320 respond.src.js
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689 respond.src.js
@@ -1,324 +1,373 @@
-/*! matchMedia() polyfill - Test a CSS media type/query in JS. Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas. Dual MIT/BSD license */
-/*! NOTE: If you're already including a window.matchMedia polyfill via Modernizr or otherwise, you don't need this part */
-window.matchMedia = window.matchMedia || (function(doc, undefined){
-
- var bool,
- docElem = doc.documentElement,
- refNode = docElem.firstElementChild || docElem.firstChild,
- // fakeBody required for <FF4 when executed in <head>
- fakeBody = doc.createElement('body'),
- div = doc.createElement('div');
-
- div.id = 'mq-test-1';
- div.style.cssText = "position:absolute;top:-100em";
- fakeBody.appendChild(div);
-
- return function(q){
-
- div.innerHTML = '&shy;<style media="'+q+'"> #mq-test-1 { width: 42px; }</style>';
-
- docElem.insertBefore(fakeBody, refNode);
- bool = div.offsetWidth == 42;
- docElem.removeChild(fakeBody);
-
- return { matches: bool, media: q };
- };
-
-})(document);
+/*! Respond.js v1.1.0: min/max-width media query polyfill. (c) Scott Jehl. MIT/GPLv2 Lic. j.mp/respondjs */
+/* mediaQuery support (including listeners) based on https://github.com/paulirish/matchMedia.js James Westgate queryj.com */
+(function( win ){
+ //exposed namespace
+ win.respond = {};
+ //define update even in native-mq-supporting browsers, to avoid errors
+ respond.update = function(){};
+ //expose media query support flag for external use
+ respond.mediaQueriesSupported = win.matchMedia && win.matchMedia( "only all" ).matches;
+ //if media queries are supported, exit here
+ if( respond.mediaQueriesSupported ){ return; }
-/*! Respond.js v1.1.0: min/max-width media query polyfill. (c) Scott Jehl. MIT/GPLv2 Lic. j.mp/respondjs */
-(function( win ){
- //exposed namespace
- win.respond = {};
-
- //define update even in native-mq-supporting browsers, to avoid errors
- respond.update = function(){};
-
- //expose media query support flag for external use
- respond.mediaQueriesSupported = win.matchMedia && win.matchMedia( "only all" ).matches;
-
- //if media queries are supported, exit here
- if( respond.mediaQueriesSupported ){ return; }
-
- //define vars
- var doc = win.document,
- docElem = doc.documentElement,
- mediastyles = [],
- rules = [],
- appendedEls = [],
- parsedSheets = {},
- resizeThrottle = 30,
- head = doc.getElementsByTagName( "head" )[0] || docElem,
- base = doc.getElementsByTagName( "base" )[0],
- links = head.getElementsByTagName( "link" ),
- requestQueue = [],
-
- //loop stylesheets, send text content to translate
- ripCSS = function(){
- var sheets = links,
- sl = sheets.length,
- i = 0,
- //vars for loop:
- sheet, href, media, isCSS;
-
- for( ; i < sl; i++ ){
- sheet = sheets[ i ],
- href = sheet.href,
- media = sheet.media,
- isCSS = sheet.rel && sheet.rel.toLowerCase() === "stylesheet";
-
- //only links plz and prevent re-parsing
- if( !!href && isCSS && !parsedSheets[ href ] ){
- // selectivizr exposes css through the rawCssText expando
- if (sheet.styleSheet && sheet.styleSheet.rawCssText) {
- translate( sheet.styleSheet.rawCssText, href, media );
- parsedSheets[ href ] = true;
- } else {
- if( (!/^([a-zA-Z:]*\/\/)/.test( href ) && !base)
- || href.replace( RegExp.$1, "" ).split( "/" )[0] === win.location.host ){
- requestQueue.push( {
- href: href,
- media: media
- } );
- }
- }
- }
- }
- makeRequests();
- },
-
- //recurse through request queue, get css text
- makeRequests = function(){
- if( requestQueue.length ){
- var thisRequest = requestQueue.shift();
-
- ajax( thisRequest.href, function( styles ){
- translate( styles, thisRequest.href, thisRequest.media );
- parsedSheets[ thisRequest.href ] = true;
- makeRequests();
- } );
- }
- },
-
- //find media blocks in css text, convert to style blocks
- translate = function( styles, href, media ){
- var qs = styles.match( /@media[^\{]+\{([^\{\}]*\{[^\}\{]*\})+/gi ),
- ql = qs && qs.length || 0,
- //try to get CSS path
- href = href.substring( 0, href.lastIndexOf( "/" )),
- repUrls = function( css ){
- return css.replace( /(url\()['"]?([^\/\)'"][^:\)'"]+)['"]?(\))/g, "$1" + href + "$2$3" );
- },
- useMedia = !ql && media,
- //vars used in loop
- i = 0,
- j, fullq, thisq, eachq, eql;
-
- //if path exists, tack on trailing slash
- if( href.length ){ href += "/"; }
-
- //if no internal queries exist, but media attr does, use that
- //note: this currently lacks support for situations where a media attr is specified on a link AND
- //its associated stylesheet has internal CSS media queries.
- //In those cases, the media attribute will currently be ignored.
- if( useMedia ){
- ql = 1;
- }
-
-
- for( ; i < ql; i++ ){
- j = 0;
-
- //media attr
- if( useMedia ){
- fullq = media;
- rules.push( repUrls( styles ) );
- }
- //parse for styles
- else{
- fullq = qs[ i ].match( /@media *([^\{]+)\{([\S\s]+?)$/ ) && RegExp.$1;
- rules.push( RegExp.$2 && repUrls( RegExp.$2 ) );
- }
-
- eachq = fullq.split( "," );
- eql = eachq.length;
-
- for( ; j < eql; j++ ){
- thisq = eachq[ j ];
- mediastyles.push( {
- media : thisq.split( "(" )[ 0 ].match( /(only\s+)?([a-zA-Z]+)\s?/ ) && RegExp.$2 || "all",
- rules : rules.length - 1,
- hasquery: thisq.indexOf("(") > -1,
- minw : thisq.match( /\(min\-width:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/ ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" ),
- maxw : thisq.match( /\(max\-width:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/ ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" )
- } );
- }
- }
-
- applyMedia();
- },
-
- lastCall,
-
- resizeDefer,
-
- // returns the value of 1em in pixels
- getEmValue = function() {
- var ret,
- div = doc.createElement('div'),
- body = doc.body,
- fakeUsed = false;
-
- div.style.cssText = "position:absolute;font-size:1em;width:1em";
-
- if( !body ){
- body = fakeUsed = doc.createElement( "body" );
- }
-
- body.appendChild( div );
-
- docElem.insertBefore( body, docElem.firstChild );
-
- ret = div.offsetWidth;
-
- if( fakeUsed ){
- docElem.removeChild( body );
- }
- else {
- body.removeChild( div );
- }
-
- //also update eminpx before returning
- ret = eminpx = parseFloat(ret);
-
- return ret;
- },
-
- //cached container for 1em value, populated the first time it's needed
- eminpx,
-
- //enable/disable styles
- applyMedia = function( fromResize ){
- var name = "clientWidth",
- docElemProp = docElem[ name ],
- currWidth = doc.compatMode === "CSS1Compat" && docElemProp || doc.body[ name ] || docElemProp,
- styleBlocks = {},
- lastLink = links[ links.length-1 ],
- now = (new Date()).getTime();
-
- //throttle resize calls
- if( fromResize && lastCall && now - lastCall < resizeThrottle ){
- clearTimeout( resizeDefer );
- resizeDefer = setTimeout( applyMedia, resizeThrottle );
- return;
- }
- else {
- lastCall = now;
- }
-
- for( var i in mediastyles ){
- var thisstyle = mediastyles[ i ],
- min = thisstyle.minw,
- max = thisstyle.maxw,
- minnull = min === null,
- maxnull = max === null,
- em = "em";
-
- if( !!min ){
- min = parseFloat( min ) * ( min.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
- }
- if( !!max ){
- max = parseFloat( max ) * ( max.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
- }
-
- // if there's no media query at all (the () part), or min or max is not null, and if either is present, they're true
- if( !thisstyle.hasquery || ( !minnull || !maxnull ) && ( minnull || currWidth >= min ) && ( maxnull || currWidth <= max ) ){
- if( !styleBlocks[ thisstyle.media ] ){
- styleBlocks[ thisstyle.media ] = [];
- }
- styleBlocks[ thisstyle.media ].push( rules[ thisstyle.rules ] );
- }
- }
-
- //remove any existing respond style element(s)
- for( var i in appendedEls ){
- if( appendedEls[ i ] && appendedEls[ i ].parentNode === head ){
- head.removeChild( appendedEls[ i ] );
- }
- }
-
- //inject active styles, grouped by media type
- for( var i in styleBlocks ){
- var ss = doc.createElement( "style" ),
- css = styleBlocks[ i ].join( "\n" );
-
- ss.type = "text/css";
- ss.media = i;
-
- //originally, ss was appended to a documentFragment and sheets were appended in bulk.
- //this caused crashes in IE in a number of circumstances, such as when the HTML element had a bg image set, so appending beforehand seems best. Thanks to @dvelyk for the initial research on this one!
- head.insertBefore( ss, lastLink.nextSibling );
-
- if ( ss.styleSheet ){
- ss.styleSheet.cssText = css;
- }
- else {
- ss.appendChild( doc.createTextNode( css ) );
- }
-
- //push to appendedEls to track for later removal
- appendedEls.push( ss );
- }
- },
- //tweaked Ajax functions from Quirksmode
- ajax = function( url, callback ) {
- var req = xmlHttp();
- if (!req){
- return;
- }
- req.open( "GET", url, true );
- req.onreadystatechange = function () {
- if ( req.readyState != 4 || req.status != 200 && req.status != 304 ){
- return;
- }
- callback( req.responseText );
- }
- if ( req.readyState == 4 ){
- return;
- }
- req.send( null );
- },
- //define ajax obj
- xmlHttp = (function() {
- var xmlhttpmethod = false;
- try {
- xmlhttpmethod = new XMLHttpRequest();
- }
- catch( e ){
- xmlhttpmethod = new ActiveXObject( "Microsoft.XMLHTTP" );
- }
- return function(){
- return xmlhttpmethod;
- };
- })();
-
- //translate CSS
- ripCSS();
-
- //expose update for re-running respond later on
- respond.update = ripCSS;
-
- //adjust on resize
- function callMedia(){
- applyMedia( true );
- }
- if( win.addEventListener ){
- win.addEventListener( "resize", callMedia, false );
- }
- else if( win.attachEvent ){
- win.attachEvent( "onresize", callMedia );
- }
-})(this);
+ //Set up the media query list
+ window.matchMedia = function(q){
+
+ var query, ls = [];
+
+ query = {
+ matches: false,
+ media: q,
+ addListener: function(listener) {
+ if (typeof listener === 'function') ls.push(listener);
+ },
+ removeListener: function(listener) {
+ for (var i=0,len=ls.length; i<len; i++) if (ls[i] === listener) delete ls[i];
+ }
+ };
+
+ query._listeners = ls;
+ query._matches = false;
+
+ //Parse the query
+ translate(q, '', '', query);
+
+ return query;
+ };
+
+ //define vars
+ var doc = win.document,
+ docElem = doc.documentElement,
+ mediastyles = [],
+ rules = [],
+ appendedEls = [],
+ parsedSheets = {},
+ resizeThrottle = 30,
+ head = doc.getElementsByTagName( "head" )[0] || docElem,
+ base = doc.getElementsByTagName( "base" )[0],
+ links = head.getElementsByTagName( "link" ),
+ requestQueue = [],
+
+ canMediaQuery,
+ refNode = docElem.firstElementChild || docElem.firstChild,
+ fakeBody = doc.createElement('body'), // fakeBody required for <FF4 when executed in <head>
+ div = doc.createElement('div'),
+
+ //feature detect media queries (we still need code for listeners though)
+ detectMediaQuery = function() {
+ div.id = 'mq-test-1';
+ div.style.cssText = "position:absolute;top:-100em";
+ fakeBody.appendChild(div);
+
+ div.innerHTML = '&shy;<style>@media only all {#mq-test-1 { width: 42px; }}</style>';
+
+ docElem.insertBefore(fakeBody, refNode);
+ canMediaQuery = div.offsetWidth == 42;
+ docElem.removeChild(fakeBody);
+ },
+
+ //loop stylesheets, send text content to translate
+ ripCSS = function(){
+ var sheets = links,
+ sl = sheets.length,
+ i = 0,
+ //vars for loop:
+ sheet, href, media, isCSS;
+
+ for( ; i < sl; i++ ){
+ sheet = sheets[ i ],
+ href = sheet.href,
+ media = sheet.media,
+ isCSS = sheet.rel && sheet.rel.toLowerCase() === "stylesheet";
+
+ //only links plz and prevent re-parsing
+ if( !!href && isCSS && !parsedSheets[ href ] ){
+ // selectivizr exposes css through the rawCssText expando
+ if (sheet.styleSheet && sheet.styleSheet.rawCssText) {
+ translate( sheet.styleSheet.rawCssText, href, media );
+ parsedSheets[ href ] = true;
+ } else {
+ if( (!/^([a-zA-Z:]*\/\/)/.test( href ) && !base)
+ || href.replace( RegExp.$1, "" ).split( "/" )[0] === win.location.host ){
+ requestQueue.push( {
+ href: href,
+ media: media
+ } );
+ }
+ }
+ }
+ }
+ makeRequests();
+ },
+
+ //recurse through request queue, get css text
+ makeRequests = function(){
+ if( requestQueue.length ){
+ var thisRequest = requestQueue.shift();
+
+ ajax( thisRequest.href, function( styles ){
+ translate( styles, thisRequest.href, thisRequest.media );
+ parsedSheets[ thisRequest.href ] = true;
+ makeRequests();
+ } );
+ }
+ },
+
+ //find media blocks in css text, convert to style blocks
+ translate = function( styles, href, media, query ){
+
+ var qs = styles.match( /@media[^\{]+\{([^\{\}]*\{[^\}\{]*\})+/gi ),
+ ql = qs && qs.length || 0,
+ //try to get CSS path
+ href = href.substring( 0, href.lastIndexOf( "/" )),
+ repUrls = function( css ){
+ return css.replace( /(url\()['"]?([^\/\)'"][^:\)'"]+)['"]?(\))/g, "$1" + href + "$2$3" );
+ },
+ useMedia = !ql && media;
+
+
+ //vars used in loop
+ var i = 0, j, fullq, thisq, eachq, eql;
+
+ //if path exists, tack on trailing slash
+ if( href.length ){ href += "/"; }
+
+ //if no internal queries exist, but media attr does, use that
+ //note: this currently lacks support for situations where a media attr is specified on a link AND
+ //its associated stylesheet has internal CSS media queries.
+ //In those cases, the media attribute will currently be ignored.
+ if(query || useMedia ){
+ ql = 1;
+ }
+
+
+ for( ; i < ql; i++ ){
+ j = 0;
+
+ //Push the query object into the rules list instead of styles
+ if (query) {
+ fullq = query.media;
+ rules.push(query);
+ }
+ else {
+
+ //media attr
+ if( useMedia ){
+ fullq = media;
+ rules.push( repUrls( styles ) );
+ }
+ //parse for styles
+ else{
+ fullq = qs[ i ].match( /@media *([^\{]+)\{([\S\s]+?)$/ ) && RegExp.$1;
+ rules.push( RegExp.$2 && repUrls( RegExp.$2 ) );
+ }
+ }
+
+ eachq = fullq.split( "," );
+ eql = eachq.length;
+
+ for( ; j < eql; j++ ){
+ thisq = eachq[ j ];
+ mediastyles.push( {
+ media : thisq.split( "(" )[ 0 ].match( /(only\s+)?([a-zA-Z]+)\s?/ ) && RegExp.$2 || "all",
+ rules : rules.length - 1,
+ hasquery: thisq.indexOf("(") > -1,
+ minw : thisq.match( /\(min\-width:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/ ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" ),
+ maxw : thisq.match( /\(max\-width:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/ ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" )
+ } );
+ }
+ }
+
+ applyMedia();
+ },
+
+ lastCall,
+
+ resizeDefer,
+
+ // returns the value of 1em in pixels
+ getEmValue = function() {
+ var ret,
+ div = doc.createElement('div'),
+ body = doc.body,
+ fakeUsed = false;
+
+ div.style.cssText = "position:absolute;font-size:1em;width:1em";
+
+ if( !body ){
+ body = fakeUsed = doc.createElement( "body" );
+ }
+
+ body.appendChild( div );
+
+ docElem.insertBefore( body, docElem.firstChild );
+
+ ret = div.offsetWidth;
+
+ if( fakeUsed ){
+ docElem.removeChild( body );
+ }
+ else {
+ body.removeChild( div );
+ }
+
+ //also update eminpx before returning
+ ret = eminpx = parseFloat(ret);
+
+ return ret;
+ },
+
+ //cached container for 1em value, populated the first time it's needed
+ eminpx,
+
+ //enable/disable styles
+ applyMedia = function( fromResize ){
+ var name = "clientWidth",
+ docElemProp = docElem[ name ],
+ currWidth = doc.compatMode === "CSS1Compat" && docElemProp || doc.body[ name ] || docElemProp,
+ styleBlocks = {},
+ lastLink = links[ links.length-1 ],
+ now = (new Date()).getTime();
+
+ //throttle resize calls
+ if( fromResize && lastCall && now - lastCall < resizeThrottle ){
+ clearTimeout( resizeDefer );
+ resizeDefer = setTimeout( applyMedia, resizeThrottle );
+ return;
+ }
+ else {
+ lastCall = now;
+ }
+
+ for( var i in mediastyles ){
+ var thisstyle = mediastyles[ i ],
+ min = thisstyle.minw,
+ max = thisstyle.maxw,
+ minnull = min === null,
+ maxnull = max === null,
+ em = "em";
+
+ if( !!min ){
+ min = parseFloat( min ) * ( min.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
+ }
+ if( !!max ){
+ max = parseFloat( max ) * ( max.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
+ }
+
+ var rule = rules[thisstyle.rules];
+ if (rule._listeners) rule.matches = false;
+
+ // if there's no media query at all (the () part), or min or max is not null, and if either is present, they're true
+ if( !thisstyle.hasquery || ( !minnull || !maxnull ) && ( minnull || currWidth >= min ) && ( maxnull || currWidth <= max ) ){
+ if( !styleBlocks[ thisstyle.media ] ){
+ styleBlocks[ thisstyle.media ] = [];
+ }
+
+ if (rule._listeners) {
+ var listeners = rule._listeners;
+ rule.matches = true;
+ }
+ else {
+ styleBlocks[ thisstyle.media ].push(rule);
+ }
+ }
+ }
+
+ //remove any existing respond style element(s)
+ for( var i in appendedEls ){
+ if( appendedEls[ i ] && appendedEls[ i ].parentNode === head ){
+ head.removeChild( appendedEls[ i ] );
+ }
+ }
+
+ //inject active styles, grouped by media type
+ for( var i in styleBlocks ){
+ var ss = doc.createElement( "style" ),
+ css = styleBlocks[ i ].join( "\n" );
+
+ ss.type = "text/css";
+ ss.media = i;
+
+ //originally, ss was appended to a documentFragment and sheets were appended in bulk.
+ //this caused crashes in IE in a number of circumstances, such as when the HTML element had a bg image set, so appending beforehand seems best. Thanks to @dvelyk for the initial research on this one!
+ head.insertBefore( ss, lastLink.nextSibling );
+
+ if ( ss.styleSheet ){
+ ss.styleSheet.cssText = css;
+ }
+ else {
+ ss.appendChild( doc.createTextNode( css ) );
+ }
+
+ //push to appendedEls to track for later removal
+ appendedEls.push( ss );
+ }
+
+ //Loop through rules and raise listeners for any changes
+ for (var i=0,len=rules.length; i<len; i++) {
+ var rule = rules[i];
+ if (rule._listeners && rule.matches != rule._matches) {
+ rule._matches = rule.matches;
+ for (var j=0,len2=rule._listeners.length;j<len2;j++) {
+ if (rule._listeners[j]) rule._listeners[j](rule);
+ }
+ }
+ }
+ },
+ //tweaked Ajax functions from Quirksmode
+ ajax = function( url, callback ) {
+ var req = xmlHttp();
+ if (!req){
+ return;
+ }
+ req.open( "GET", url, true );
+ req.onreadystatechange = function () {
+ if ( req.readyState != 4 || req.status != 200 && req.status != 304 ){
+ return;
+ }
+ callback( req.responseText );
+ }
+ if ( req.readyState == 4 ){
+ return;
+ }
+ req.send( null );
+ },
+ //define ajax obj
+ xmlHttp = (function() {
+ var xmlhttpmethod = false;
+ try {
+ xmlhttpmethod = new XMLHttpRequest();
+ }
+ catch( e ){
+ xmlhttpmethod = new ActiveXObject( "Microsoft.XMLHTTP" );
+ }
+ return function(){
+ return xmlhttpmethod;
+ };
+ })();
+
+ //Determine if supports media queries (but doesnt support matchMedia eg IE9)
+ detectMediaQuery();
+
+ //expose update for re-running respond later on
+ respond.update = function() {
+ (canMediaQuery) ? applyMedia() : ripCSS();
+ }
+
+ respond.update();
+
+ //adjust on resize
+ function callMedia(){
+ applyMedia( true );
+ }
+
+ if( win.addEventListener ){
+ win.addEventListener( "resize", callMedia, false );
+ }
+ else if( win.attachEvent ){
+ win.attachEvent( "onresize", callMedia );
+ }
+})(this);

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