224 lines
8.3 KiB
JavaScript
224 lines
8.3 KiB
JavaScript
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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 */
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/*! NOTE: If you're already including a window.matchMedia polyfill via Modernizr or otherwise, you don't need this part */
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(function(w) {
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"use strict";
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w.matchMedia = w.matchMedia || function(doc, undefined) {
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var bool, docElem = doc.documentElement, refNode = docElem.firstElementChild || docElem.firstChild, fakeBody = doc.createElement("body"), div = doc.createElement("div");
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div.id = "mq-test-1";
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div.style.cssText = "position:absolute;top:-100em";
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fakeBody.style.background = "none";
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fakeBody.appendChild(div);
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return function(q) {
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div.innerHTML = '­<style media="' + q + '"> #mq-test-1 { width: 42px; }</style>';
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docElem.insertBefore(fakeBody, refNode);
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bool = div.offsetWidth === 42;
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docElem.removeChild(fakeBody);
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return {
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matches: bool,
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media: q
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};
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};
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}(w.document);
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})(this);
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/*! Respond.js v1.4.0: min/max-width media query polyfill. (c) Scott Jehl. MIT Lic. j.mp/respondjs */
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(function(w) {
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"use strict";
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var respond = {};
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w.respond = respond;
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respond.update = function() {};
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var requestQueue = [], xmlHttp = function() {
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var xmlhttpmethod = false;
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try {
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xmlhttpmethod = new w.XMLHttpRequest();
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} catch (e) {
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xmlhttpmethod = new w.ActiveXObject("Microsoft.XMLHTTP");
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}
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return function() {
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return xmlhttpmethod;
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};
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}(), ajax = function(url, callback) {
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var req = xmlHttp();
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if (!req) {
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return;
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}
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req.open("GET", url, true);
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req.onreadystatechange = function() {
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if (req.readyState !== 4 || req.status !== 200 && req.status !== 304) {
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return;
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}
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callback(req.responseText);
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};
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if (req.readyState === 4) {
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return;
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}
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req.send(null);
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};
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respond.ajax = ajax;
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respond.queue = requestQueue;
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respond.regex = {
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media: /@media[^\{]+\{([^\{\}]*\{[^\}\{]*\})+/gi,
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keyframes: /@(?:\-(?:o|moz|webkit)\-)?keyframes[^\{]+\{(?:[^\{\}]*\{[^\}\{]*\})+[^\}]*\}/gi,
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urls: /(url\()['"]?([^\/\)'"][^:\)'"]+)['"]?(\))/g,
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findStyles: /@media *([^\{]+)\{([\S\s]+?)$/,
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only: /(only\s+)?([a-zA-Z]+)\s?/,
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minw: /\([\s]*min\-width\s*:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/,
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maxw: /\([\s]*max\-width\s*:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/
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};
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respond.mediaQueriesSupported = w.matchMedia && w.matchMedia("only all") !== null && w.matchMedia("only all").matches;
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if (respond.mediaQueriesSupported) {
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return;
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}
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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, eminpx, getEmValue = function() {
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var ret, div = doc.createElement("div"), body = doc.body, originalHTMLFontSize = docElem.style.fontSize, originalBodyFontSize = body && body.style.fontSize, fakeUsed = false;
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div.style.cssText = "position:absolute;font-size:1em;width:1em";
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if (!body) {
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body = fakeUsed = doc.createElement("body");
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body.style.background = "none";
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}
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docElem.style.fontSize = "100%";
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body.style.fontSize = "100%";
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body.appendChild(div);
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if (fakeUsed) {
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docElem.insertBefore(body, docElem.firstChild);
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}
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ret = div.offsetWidth;
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if (fakeUsed) {
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docElem.removeChild(body);
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} else {
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body.removeChild(div);
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}
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docElem.style.fontSize = originalHTMLFontSize;
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if (originalBodyFontSize) {
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body.style.fontSize = originalBodyFontSize;
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}
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ret = eminpx = parseFloat(ret);
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return ret;
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}, applyMedia = function(fromResize) {
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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();
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if (fromResize && lastCall && now - lastCall < resizeThrottle) {
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w.clearTimeout(resizeDefer);
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resizeDefer = w.setTimeout(applyMedia, resizeThrottle);
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return;
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} else {
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lastCall = now;
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}
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for (var i in mediastyles) {
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if (mediastyles.hasOwnProperty(i)) {
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var thisstyle = mediastyles[i], min = thisstyle.minw, max = thisstyle.maxw, minnull = min === null, maxnull = max === null, em = "em";
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if (!!min) {
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min = parseFloat(min) * (min.indexOf(em) > -1 ? eminpx || getEmValue() : 1);
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}
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if (!!max) {
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max = parseFloat(max) * (max.indexOf(em) > -1 ? eminpx || getEmValue() : 1);
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}
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if (!thisstyle.hasquery || (!minnull || !maxnull) && (minnull || currWidth >= min) && (maxnull || currWidth <= max)) {
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if (!styleBlocks[thisstyle.media]) {
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styleBlocks[thisstyle.media] = [];
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}
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styleBlocks[thisstyle.media].push(rules[thisstyle.rules]);
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}
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}
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}
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for (var j in appendedEls) {
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if (appendedEls.hasOwnProperty(j)) {
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if (appendedEls[j] && appendedEls[j].parentNode === head) {
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head.removeChild(appendedEls[j]);
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}
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}
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}
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appendedEls.length = 0;
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for (var k in styleBlocks) {
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if (styleBlocks.hasOwnProperty(k)) {
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var ss = doc.createElement("style"), css = styleBlocks[k].join("\n");
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ss.type = "text/css";
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ss.media = k;
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head.insertBefore(ss, lastLink.nextSibling);
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if (ss.styleSheet) {
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ss.styleSheet.cssText = css;
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} else {
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ss.appendChild(doc.createTextNode(css));
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}
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appendedEls.push(ss);
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}
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}
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}, translate = function(styles, href, media) {
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var qs = styles.replace(respond.regex.keyframes, "").match(respond.regex.media), ql = qs && qs.length || 0;
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href = href.substring(0, href.lastIndexOf("/"));
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var repUrls = function(css) {
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return css.replace(respond.regex.urls, "$1" + href + "$2$3");
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}, useMedia = !ql && media;
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if (href.length) {
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href += "/";
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}
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if (useMedia) {
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ql = 1;
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}
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for (var i = 0; i < ql; i++) {
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var fullq, thisq, eachq, eql;
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if (useMedia) {
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fullq = media;
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rules.push(repUrls(styles));
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} else {
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fullq = qs[i].match(respond.regex.findStyles) && RegExp.$1;
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rules.push(RegExp.$2 && repUrls(RegExp.$2));
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}
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eachq = fullq.split(",");
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eql = eachq.length;
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for (var j = 0; j < eql; j++) {
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thisq = eachq[j];
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mediastyles.push({
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media: thisq.split("(")[0].match(respond.regex.only) && RegExp.$2 || "all",
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rules: rules.length - 1,
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hasquery: thisq.indexOf("(") > -1,
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minw: thisq.match(respond.regex.minw) && parseFloat(RegExp.$1) + (RegExp.$2 || ""),
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maxw: thisq.match(respond.regex.maxw) && parseFloat(RegExp.$1) + (RegExp.$2 || "")
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});
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}
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}
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applyMedia();
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}, makeRequests = function() {
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if (requestQueue.length) {
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var thisRequest = requestQueue.shift();
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ajax(thisRequest.href, function(styles) {
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translate(styles, thisRequest.href, thisRequest.media);
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parsedSheets[thisRequest.href] = true;
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w.setTimeout(function() {
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makeRequests();
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}, 0);
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});
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}
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}, ripCSS = function() {
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for (var i = 0; i < links.length; i++) {
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var sheet = links[i], href = sheet.href, media = sheet.media, isCSS = sheet.rel && sheet.rel.toLowerCase() === "stylesheet";
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if (!!href && isCSS && !parsedSheets[href]) {
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if (sheet.styleSheet && sheet.styleSheet.rawCssText) {
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translate(sheet.styleSheet.rawCssText, href, media);
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parsedSheets[href] = true;
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} else {
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if (!/^([a-zA-Z:]*\/\/)/.test(href) && !base || href.replace(RegExp.$1, "").split("/")[0] === w.location.host) {
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if (href.substring(0, 2) === "//") {
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href = w.location.protocol + href;
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}
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requestQueue.push({
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href: href,
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media: media
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});
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}
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}
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}
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}
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makeRequests();
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};
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ripCSS();
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respond.update = ripCSS;
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respond.getEmValue = getEmValue;
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function callMedia() {
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applyMedia(true);
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}
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if (w.addEventListener) {
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w.addEventListener("resize", callMedia, false);
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} else if (w.attachEvent) {
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w.attachEvent("onresize", callMedia);
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}
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})(this);
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