Adding respond.js.
[live-systems.org.git] / stuff / respond / respond.js
diff --git a/stuff/respond/respond.js b/stuff/respond/respond.js
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+/*! 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 ) {
+
+  "use strict";
+
+  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.style.background = "none";
+  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 v1.3.0: min/max-width media query polyfill. (c) Scott Jehl. MIT/GPLv2 Lic. j.mp/respondjs  */
+(function( win ){
+
+       "use strict";
+
+       //exposed namespace
+       var respond = {};
+       win.respond = 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(){
+
+                       for( var i = 0; i < links.length; i++ ){
+                               var sheet = links[ 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;
+
+                                       // by wrapping recursive function call in setTimeout 
+                                       // we prevent "Stack overflow" error in IE7
+                                       win.setTimeout(function(){ makeRequests(); },0);
+                               } );
+                       }
+               },
+               
+               //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( "/" ) );
+
+                       var repUrls     = function( css ){
+                                       return css.replace( /(url\()['"]?([^\/\)'"][^:\)'"]+)['"]?(\))/g, "$1" + href + "$2$3" );
+                               },
+                               useMedia = !ql && media;
+
+                       //if path exists, tack on trailing slash
+                       if( href.length ){ href += "/"; }       
+                               
+                       //if no internal queries exist, but media attr does, use that   
+                       //note: this currently lacks support for situations where a media attr is specified on a link AND
+                               //its associated stylesheet has internal CSS media queries.
+                               //In those cases, the media attribute will currently be ignored.
+                       if( useMedia ){
+                               ql = 1;
+                       }
+
+                       for( var i = 0; i < ql; i++ ){
+                               var fullq, thisq, eachq, eql;
+
+                               //media attr
+                               if( useMedia ){
+                                       fullq = media;
+                                       rules.push( repUrls( styles ) );
+                               }
+                               //parse for styles
+                               else{
+                                       fullq = qs[ i ].match( /@media *([^\{]+)\{([\S\s]+?)$/ ) && RegExp.$1;
+                                       rules.push( RegExp.$2 && repUrls( RegExp.$2 ) );
+                               }
+                               
+                               eachq = fullq.split( "," );
+                               eql     = eachq.length;
+                                       
+                               for( var j = 0; 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( /\(\s*min\-width\s*:\s*(\s*[0-9\.]+)(px|em)\s*\)/ ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" ), 
+                                               maxw : thisq.match( /\(\s*max\-width\s*:\s*(\s*[0-9\.]+)(px|em)\s*\)/ ) && 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.style.background = "none";
+                       }
+                                       
+                       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 ){
+                               win.clearTimeout( resizeDefer );
+                               resizeDefer = win.setTimeout( applyMedia, resizeThrottle );
+                               return;
+                       }
+                       else {
+                               lastCall = now;
+                       }
+                                                                               
+                       for( var i in mediastyles ){
+                               if( mediastyles.hasOwnProperty( i ) ){
+                                       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 j in appendedEls ){
+                               if( appendedEls.hasOwnProperty( j ) ){
+                                       if( appendedEls[ j ] && appendedEls[ j ].parentNode === head ){
+                                               head.removeChild( appendedEls[ j ] );
+                                       }
+                               }
+                       }
+                       
+                       //inject active styles, grouped by media type
+                       for( var k in styleBlocks ){
+                               if( styleBlocks.hasOwnProperty( k ) ){
+                                       var ss = doc.createElement( "style" ),
+                                               css = styleBlocks[ k ].join( "\n" );
+                                       
+                                       ss.type = "text/css";   
+                                       ss.media = k;
+                                       
+                                       //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 win.XMLHttpRequest();
+                       }
+                       catch( e ){
+                               xmlhttpmethod = new win.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);