koha-tmpl/opac-tmpl/bootstrap/lib/respond.src.js

   1 /*! matchMedia() polyfill - Test a CSS media type/query in JS. Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas. Dual MIT/BSD license */
   2 /*! NOTE: If you're already including a window.matchMedia polyfill via Modernizr or otherwise, you don't need this part */
   3
   4 window.matchMedia = window.matchMedia || (function( doc, undefined ) {
   5
   6   "use strict";
   7
   8   var bool,
   9       docElem = doc.documentElement,
  10       refNode = docElem.firstElementChild || docElem.firstChild,
  11       // fakeBody required for <FF4 when executed in <head>
  12       fakeBody = doc.createElement( "body" ),
  13       div = doc.createElement( "div" );
  14
  15   div.id = "mq-test-1";
  16   div.style.cssText = "position:absolute;top:-100em";
  17   fakeBody.style.background = "none";
  18   fakeBody.appendChild(div);
  19
  20   return function(q){
  21
  22     div.innerHTML = "&shy;<style media=\"" + q + "\"> #mq-test-1 { width: 42px; }</style>";
  23
  24     docElem.insertBefore( fakeBody, refNode );
  25     bool = div.offsetWidth === 42;
  26     docElem.removeChild( fakeBody );
  27
  28     return {
  29       matches: bool,
  30       media: q
  31     };
  32
  33   };
  34
  35 }( document ));
  36
  37
  38
  39
  40
  41 /*! Respond.js v1.1.0: min/max-width media query polyfill. (c) Scott Jehl. MIT/GPLv2 Lic. j.mp/respondjs  */
  42 (function( win ){
  43
  44         "use strict";
  45
  46         //exposed namespace
  47         var respond = {};
  48         win.respond = respond;
  49
  50         //define update even in native-mq-supporting browsers, to avoid errors
  51         respond.update = function(){};
  52
  53         //expose media query support flag for external use
  54         respond.mediaQueriesSupported   = win.matchMedia && win.matchMedia( "only all" ).matches;
  55
  56         //if media queries are supported, exit here
  57         if( respond.mediaQueriesSupported ){
  58                 return;
  59         }
  60
  61         //define vars
  62         var doc = win.document,
  63                 docElem = doc.documentElement,
  64                 mediastyles = [],
  65                 rules = [],
  66                 appendedEls = [],
  67                 parsedSheets = {},
  68                 resizeThrottle = 30,
  69                 head = doc.getElementsByTagName( "head" )[0] || docElem,
  70                 base = doc.getElementsByTagName( "base" )[0],
  71                 links = head.getElementsByTagName( "link" ),
  72                 requestQueue = [],
  73
  74                 //loop stylesheets, send text content to translate
  75                 ripCSS = function(){
  76
  77                         for( var i = 0; i < links.length; i++ ){
  78                                 var sheet = links[ i ],
  79                                 href = sheet.href,
  80                                 media = sheet.media,
  81                                 isCSS = sheet.rel && sheet.rel.toLowerCase() === "stylesheet";
  82
  83                                 //only links plz and prevent re-parsing
  84                                 if( !!href && isCSS && !parsedSheets[ href ] ){
  85                                         // selectivizr exposes css through the rawCssText expando
  86                                         if (sheet.styleSheet && sheet.styleSheet.rawCssText) {
  87                                                 translate( sheet.styleSheet.rawCssText, href, media );
  88                                                 parsedSheets[ href ] = true;
  89                                         } else {
  90                                                 if( (!/^([a-zA-Z:]*\/\/)/.test( href ) && !base) ||
  91                                                         href.replace( RegExp.$1, "" ).split( "/" )[0] === win.location.host ){
  92                                                         requestQueue.push( {
  93                                                                 href: href,
  94                                                                 media: media
  95                                                         } );
  96                                                 }
  97                                         }
  98                                 }
  99                         }
 100                         makeRequests();
 101                 },
 102
 103                 //recurse through request queue, get css text
 104                 makeRequests    = function(){
 105                         if( requestQueue.length ){
 106                                 var thisRequest = requestQueue.shift();
 107
 108                                 ajax( thisRequest.href, function( styles ){
 109                                         translate( styles, thisRequest.href, thisRequest.media );
 110                                         parsedSheets[ thisRequest.href ] = true;
 111
 112                                         // by wrapping recursive function call in setTimeout
 113                                         // we prevent "Stack overflow" error in IE7
 114                                         win.setTimeout(function(){ makeRequests(); },0);
 115                                 } );
 116                         }
 117                 },
 118
 119                 //find media blocks in css text, convert to style blocks
 120                 translate = function( styles, href, media ){
 121                         var qs = styles.match(  /@media[^\{]+\{([^\{\}]*\{[^\}\{]*\})+/gi ),
 122                                 ql = qs && qs.length || 0;
 123
 124                         //try to get CSS path
 125                         href = href.substring( 0, href.lastIndexOf( "/" ) );
 126
 127                         var repUrls     = function( css ){
 128                                         return css.replace( /(url\()['"]?([^\/\)'"][^:\)'"]+)['"]?(\))/g, "$1" + href + "$2$3" );
 129                                 },
 130                                 useMedia = !ql && media;
 131
 132                         //if path exists, tack on trailing slash
 133                         if( href.length ){ href += "/"; }
 134
 135                         //if no internal queries exist, but media attr does, use that
 136                         //note: this currently lacks support for situations where a media attr is specified on a link AND
 137                                 //its associated stylesheet has internal CSS media queries.
 138                                 //In those cases, the media attribute will currently be ignored.
 139                         if( useMedia ){
 140                                 ql = 1;
 141                         }
 142
 143                         for( var i = 0; i < ql; i++ ){
 144                                 var fullq, thisq, eachq, eql;
 145
 146                                 //media attr
 147                                 if( useMedia ){
 148                                         fullq = media;
 149                                         rules.push( repUrls( styles ) );
 150                                 }
 151                                 //parse for styles
 152                                 else{
 153                                         fullq = qs[ i ].match( /@media *([^\{]+)\{([\S\s]+?)$/ ) && RegExp.$1;
 154                                         rules.push( RegExp.$2 && repUrls( RegExp.$2 ) );
 155                                 }
 156
 157                                 eachq = fullq.split( "," );
 158                                 eql     = eachq.length;
 159
 160                                 for( var j = 0; j < eql; j++ ){
 161                                         thisq = eachq[ j ];
 162                                         mediastyles.push( {
 163                                                 media : thisq.split( "(" )[ 0 ].match( /(only\s+)?([a-zA-Z]+)\s?/ ) && RegExp.$2 || "all",
 164                                                 rules : rules.length - 1,
 165                                                 hasquery : thisq.indexOf("(") > -1,
 166                                                 minw : thisq.match( /\(\s*min\-width\s*:\s*(\s*[0-9\.]+)(px|em)\s*\)/ ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" ),
 167                                                 maxw : thisq.match( /\(\s*max\-width\s*:\s*(\s*[0-9\.]+)(px|em)\s*\)/ ) && parseFloat( RegExp.$1 ) + ( RegExp.$2 || "" )
 168                                         } );
 169                                 }
 170                         }
 171
 172                         applyMedia();
 173                 },
 174
 175                 lastCall,
 176
 177                 resizeDefer,
 178
 179                 // returns the value of 1em in pixels
 180                 getEmValue = function() {
 181                         var ret,
 182                                 div = doc.createElement('div'),
 183                                 body = doc.body,
 184                                 fakeUsed = false;
 185
 186                         div.style.cssText = "position:absolute;font-size:1em;width:1em";
 187
 188                         if( !body ){
 189                                 body = fakeUsed = doc.createElement( "body" );
 190                                 body.style.background = "none";
 191                         }
 192
 193                         body.appendChild( div );
 194
 195                         docElem.insertBefore( body, docElem.firstChild );
 196
 197                         ret = div.offsetWidth;
 198
 199                         if( fakeUsed ){
 200                                 docElem.removeChild( body );
 201                         }
 202                         else {
 203                                 body.removeChild( div );
 204                         }
 205
 206                         //also update eminpx before returning
 207                         ret = eminpx = parseFloat(ret);
 208
 209                         return ret;
 210                 },
 211
 212                 //cached container for 1em value, populated the first time it's needed
 213                 eminpx,
 214
 215                 //enable/disable styles
 216                 applyMedia = function( fromResize ){
 217                         var name = "clientWidth",
 218                                 docElemProp = docElem[ name ],
 219                                 currWidth = doc.compatMode === "CSS1Compat" && docElemProp || doc.body[ name ] || docElemProp,
 220                                 styleBlocks     = {},
 221                                 lastLink = links[ links.length-1 ],
 222                                 now = (new Date()).getTime();
 223
 224                         //throttle resize calls
 225                         if( fromResize && lastCall && now - lastCall < resizeThrottle ){
 226                                 win.clearTimeout( resizeDefer );
 227                                 resizeDefer = win.setTimeout( applyMedia, resizeThrottle );
 228                                 return;
 229                         }
 230                         else {
 231                                 lastCall = now;
 232                         }
 233
 234                         for( var i in mediastyles ){
 235                                 if( mediastyles.hasOwnProperty( i ) ){
 236                                         var thisstyle = mediastyles[ i ],
 237                                                 min = thisstyle.minw,
 238                                                 max = thisstyle.maxw,
 239                                                 minnull = min === null,
 240                                                 maxnull = max === null,
 241                                                 em = "em";
 242
 243                                         if( !!min ){
 244                                                 min = parseFloat( min ) * ( min.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
 245                                         }
 246                                         if( !!max ){
 247                                                 max = parseFloat( max ) * ( max.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
 248                                         }
 249
 250                                         // 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
 251                                         if( !thisstyle.hasquery || ( !minnull || !maxnull ) && ( minnull || currWidth >= min ) && ( maxnull || currWidth <= max ) ){
 252                                                 if( !styleBlocks[ thisstyle.media ] ){
 253                                                         styleBlocks[ thisstyle.media ] = [];
 254                                                 }
 255                                                 styleBlocks[ thisstyle.media ].push( rules[ thisstyle.rules ] );
 256                                         }
 257                                 }
 258                         }
 259
 260                         //remove any existing respond style element(s)
 261                         for( var j in appendedEls ){
 262                                 if( appendedEls.hasOwnProperty( j ) ){
 263                                         if( appendedEls[ j ] && appendedEls[ j ].parentNode === head ){
 264                                                 head.removeChild( appendedEls[ j ] );
 265                                         }
 266                                 }
 267                         }
 268
 269                         //inject active styles, grouped by media type
 270                         for( var k in styleBlocks ){
 271                                 if( styleBlocks.hasOwnProperty( k ) ){
 272                                         var ss = doc.createElement( "style" ),
 273                                                 css = styleBlocks[ k ].join( "\n" );
 274
 275                                         ss.type = "text/css";
 276                                         ss.media = k;
 277
 278                                         //originally, ss was appended to a documentFragment and sheets were appended in bulk.
 279                                         //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!
 280                                         head.insertBefore( ss, lastLink.nextSibling );
 281
 282                                         if ( ss.styleSheet ){
 283                                                 ss.styleSheet.cssText = css;
 284                                         }
 285                                         else {
 286                                                 ss.appendChild( doc.createTextNode( css ) );
 287                                         }
 288
 289                                         //push to appendedEls to track for later removal
 290                                         appendedEls.push( ss );
 291                                 }
 292                         }
 293                 },
 294                 //tweaked Ajax functions from Quirksmode
 295                 ajax = function( url, callback ) {
 296                         var req = xmlHttp();
 297                         if (!req){
 298                                 return;
 299                         }
 300                         req.open( "GET", url, true );
 301                         req.onreadystatechange = function () {
 302                                 if ( req.readyState !== 4 || req.status !== 200 && req.status !== 304 ){
 303                                         return;
 304                                 }
 305                                 callback( req.responseText );
 306                         };
 307                         if ( req.readyState === 4 ){
 308                                 return;
 309                         }
 310                         req.send( null );
 311                 },
 312                 //define ajax obj
 313                 xmlHttp = (function() {
 314                         var xmlhttpmethod = false;
 315                         try {
 316                                 xmlhttpmethod = new win.XMLHttpRequest();
 317                         }
 318                         catch( e ){
 319                                 xmlhttpmethod = new win.ActiveXObject( "Microsoft.XMLHTTP" );
 320                         }
 321                         return function(){
 322                                 return xmlhttpmethod;
 323                         };
 324                 })();
 325
 326         //translate CSS
 327         ripCSS();
 328
 329         //expose update for re-running respond later on
 330         respond.update = ripCSS;
 331
 332         //adjust on resize
 333         function callMedia(){
 334                 applyMedia( true );
 335         }
 336         if( win.addEventListener ){
 337                 win.addEventListener( "resize", callMedia, false );
 338         }
 339         else if( win.attachEvent ){
 340                 win.attachEvent( "onresize", callMedia );
 341         }
 342 })(this);