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Diffstat (limited to 'js/respond.js')
| -rw-r--r-- | js/respond.js | 353 |
1 files changed, 0 insertions, 353 deletions
diff --git a/js/respond.js b/js/respond.js deleted file mode 100644 index 58883e4..0000000 --- a/js/respond.js +++ /dev/null @@ -1,353 +0,0 @@ -/* Respond.js: min/max-width media query polyfill. (c) Scott Jehl. MIT Lic. j.mp/respondjs */ -(function( w ){ - - "use strict"; - - //exposed namespace - var respond = {}; - w.respond = respond; - - //define update even in native-mq-supporting browsers, to avoid errors - respond.update = function(){}; - - //define ajax obj - var requestQueue = [], - xmlHttp = (function() { - var xmlhttpmethod = false; - try { - xmlhttpmethod = new w.XMLHttpRequest(); - } - catch( e ){ - xmlhttpmethod = new w.ActiveXObject( "Microsoft.XMLHTTP" ); - } - return function(){ - return xmlhttpmethod; - }; - })(), - - //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 ); - }, - isUnsupportedMediaQuery = function( query ) { - return query.replace( respond.regex.minmaxwh, '' ).match( respond.regex.other ); - }; - - //expose for testing - respond.ajax = ajax; - respond.queue = requestQueue; - respond.unsupportedmq = isUnsupportedMediaQuery; - respond.regex = { - media: /@media[^\{]+\{([^\{\}]*\{[^\}\{]*\})+/gi, - keyframes: /@(?:\-(?:o|moz|webkit)\-)?keyframes[^\{]+\{(?:[^\{\}]*\{[^\}\{]*\})+[^\}]*\}/gi, - comments: /\/\*[^*]*\*+([^/][^*]*\*+)*\//gi, - urls: /(url\()['"]?([^\/\)'"][^:\)'"]+)['"]?(\))/g, - findStyles: /@media *([^\{]+)\{([\S\s]+?)$/, - only: /(only\s+)?([a-zA-Z]+)\s?/, - minw: /\(\s*min\-width\s*:\s*(\s*[0-9\.]+)(px|em)\s*\)/, - maxw: /\(\s*max\-width\s*:\s*(\s*[0-9\.]+)(px|em)\s*\)/, - minmaxwh: /\(\s*m(in|ax)\-(height|width)\s*:\s*(\s*[0-9\.]+)(px|em)\s*\)/gi, - other: /\([^\)]*\)/g - }; - - //expose media query support flag for external use - respond.mediaQueriesSupported = w.matchMedia && w.matchMedia( "only all" ) !== null && w.matchMedia( "only all" ).matches; - - //if media queries are supported, exit here - if( respond.mediaQueriesSupported ){ - return; - } - - //define vars - var doc = w.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" ), - - lastCall, - resizeDefer, - - //cached container for 1em value, populated the first time it's needed - eminpx, - - // returns the value of 1em in pixels - getEmValue = function() { - var ret, - div = doc.createElement('div'), - body = doc.body, - originalHTMLFontSize = docElem.style.fontSize, - originalBodyFontSize = body && body.style.fontSize, - fakeUsed = false; - - div.style.cssText = "position:absolute;font-size:1em;width:1em"; - - if( !body ){ - body = fakeUsed = doc.createElement( "body" ); - body.style.background = "none"; - } - - // 1em in a media query is the value of the default font size of the browser - // reset docElem and body to ensure the correct value is returned - docElem.style.fontSize = "100%"; - body.style.fontSize = "100%"; - - body.appendChild( div ); - - if( fakeUsed ){ - docElem.insertBefore( body, docElem.firstChild ); - } - - ret = div.offsetWidth; - - if( fakeUsed ){ - docElem.removeChild( body ); - } - else { - body.removeChild( div ); - } - - // restore the original values - docElem.style.fontSize = originalHTMLFontSize; - if( originalBodyFontSize ) { - body.style.fontSize = originalBodyFontSize; - } - - - //also update eminpx before returning - ret = eminpx = parseFloat(ret); - - return ret; - }, - - //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 ){ - w.clearTimeout( resizeDefer ); - resizeDefer = w.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 ] ); - } - } - } - appendedEls.length = 0; - - //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 ); - } - } - }, - //find media blocks in css text, convert to style blocks - translate = function( styles, href, media ){ - var qs = styles.replace( respond.regex.comments, '' ) - .replace( respond.regex.keyframes, '' ) - .match( respond.regex.media ), - ql = qs && qs.length || 0; - - //try to get CSS path - href = href.substring( 0, href.lastIndexOf( "/" ) ); - - var repUrls = function( css ){ - return css.replace( respond.regex.urls, "$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( respond.regex.findStyles ) && 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 ]; - - if( isUnsupportedMediaQuery( thisq ) ) { - continue; - } - - mediastyles.push( { - media : thisq.split( "(" )[ 0 ].match( respond.regex.only ) && RegExp.$2 || "all", - rules : rules.length - 1, - hasquery : thisq.indexOf("(") > -1, - minw : thisq.match( respond.regex.minw ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" ), - maxw : thisq.match( respond.regex.maxw ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" ) - } ); - } - } - - applyMedia(); - }, - - //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 - w.setTimeout(function(){ makeRequests(); },0); - } ); - } - }, - - //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] === w.location.host ){ - // IE7 doesn't handle urls that start with '//' for ajax request - // manually add in the protocol - if ( href.substring(0,2) === "//" ) { href = w.location.protocol + href; } - requestQueue.push( { - href: href, - media: media - } ); - } - } - } - } - makeRequests(); - }; - - //translate CSS - ripCSS(); - - //expose update for re-running respond later on - respond.update = ripCSS; - - //expose getEmValue - respond.getEmValue = getEmValue; - - //adjust on resize - function callMedia(){ - applyMedia( true ); - } - - if( w.addEventListener ){ - w.addEventListener( "resize", callMedia, false ); - } - else if( w.attachEvent ){ - w.attachEvent( "onresize", callMedia ); - } -})(this); |