510 lines
19 KiB
JavaScript
510 lines
19 KiB
JavaScript
/**
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* Copyright Marc J. Schmidt. See the LICENSE file at the top-level
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* directory of this distribution and at
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* https://github.com/marcj/css-element-queries/blob/master/LICENSE.
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*/
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;
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(function (root, factory) {
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if (typeof define === "function" && define.amd) {
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define(['./ResizeSensor.js'], factory);
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} else if (typeof exports === "object") {
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module.exports = factory(require('./ResizeSensor.js'));
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} else {
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root.ElementQueries = factory(root.ResizeSensor);
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root.ElementQueries.listen();
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}
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}(typeof window !== 'undefined' ? window : this, function (ResizeSensor) {
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/**
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*
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* @type {Function}
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* @constructor
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*/
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var ElementQueries = function() {
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var trackingActive = false;
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var elements = [];
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/**
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*
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* @param element
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* @returns {Number}
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*/
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function getEmSize(element) {
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if (!element) {
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element = document.documentElement;
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}
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var fontSize = window.getComputedStyle(element, null).fontSize;
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return parseFloat(fontSize) || 16;
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}
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/**
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*
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* @copyright https://github.com/Mr0grog/element-query/blob/master/LICENSE
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*
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* @param {HTMLElement} element
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* @param {*} value
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* @returns {*}
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*/
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function convertToPx(element, value) {
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var numbers = value.split(/\d/);
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var units = numbers[numbers.length-1];
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value = parseFloat(value);
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switch (units) {
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case "px":
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return value;
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case "em":
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return value * getEmSize(element);
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case "rem":
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return value * getEmSize();
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// Viewport units!
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// According to http://quirksmode.org/mobile/tableViewport.html
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// documentElement.clientWidth/Height gets us the most reliable info
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case "vw":
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return value * document.documentElement.clientWidth / 100;
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case "vh":
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return value * document.documentElement.clientHeight / 100;
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case "vmin":
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case "vmax":
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var vw = document.documentElement.clientWidth / 100;
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var vh = document.documentElement.clientHeight / 100;
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var chooser = Math[units === "vmin" ? "min" : "max"];
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return value * chooser(vw, vh);
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default:
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return value;
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// for now, not supporting physical units (since they are just a set number of px)
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// or ex/ch (getting accurate measurements is hard)
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}
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}
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/**
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*
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* @param {HTMLElement} element
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* @constructor
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*/
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function SetupInformation(element) {
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this.element = element;
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this.options = {};
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var key, option, width = 0, height = 0, value, actualValue, attrValues, attrValue, attrName;
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/**
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* @param {Object} option {mode: 'min|max', property: 'width|height', value: '123px'}
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*/
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this.addOption = function(option) {
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var idx = [option.mode, option.property, option.value].join(',');
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this.options[idx] = option;
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};
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var attributes = ['min-width', 'min-height', 'max-width', 'max-height'];
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/**
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* Extracts the computed width/height and sets to min/max- attribute.
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*/
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this.call = function() {
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// extract current dimensions
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width = this.element.offsetWidth;
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height = this.element.offsetHeight;
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attrValues = {};
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for (key in this.options) {
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if (!this.options.hasOwnProperty(key)){
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continue;
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}
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option = this.options[key];
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value = convertToPx(this.element, option.value);
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actualValue = option.property == 'width' ? width : height;
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attrName = option.mode + '-' + option.property;
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attrValue = '';
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if (option.mode == 'min' && actualValue >= value) {
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attrValue += option.value;
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}
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if (option.mode == 'max' && actualValue <= value) {
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attrValue += option.value;
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}
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if (!attrValues[attrName]) attrValues[attrName] = '';
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if (attrValue && -1 === (' '+attrValues[attrName]+' ').indexOf(' ' + attrValue + ' ')) {
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attrValues[attrName] += ' ' + attrValue;
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}
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}
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for (var k in attributes) {
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if(!attributes.hasOwnProperty(k)) continue;
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if (attrValues[attributes[k]]) {
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this.element.setAttribute(attributes[k], attrValues[attributes[k]].substr(1));
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} else {
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this.element.removeAttribute(attributes[k]);
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}
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}
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};
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}
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/**
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* @param {HTMLElement} element
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* @param {Object} options
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*/
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function setupElement(element, options) {
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if (element.elementQueriesSetupInformation) {
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element.elementQueriesSetupInformation.addOption(options);
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} else {
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element.elementQueriesSetupInformation = new SetupInformation(element);
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element.elementQueriesSetupInformation.addOption(options);
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element.elementQueriesSensor = new ResizeSensor(element, function() {
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element.elementQueriesSetupInformation.call();
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});
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}
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element.elementQueriesSetupInformation.call();
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if (trackingActive && elements.indexOf(element) < 0) {
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elements.push(element);
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}
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}
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/**
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* @param {String} selector
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* @param {String} mode min|max
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* @param {String} property width|height
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* @param {String} value
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*/
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var allQueries = {};
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function queueQuery(selector, mode, property, value) {
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if (typeof(allQueries[mode]) == 'undefined') allQueries[mode] = {};
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if (typeof(allQueries[mode][property]) == 'undefined') allQueries[mode][property] = {};
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if (typeof(allQueries[mode][property][value]) == 'undefined') allQueries[mode][property][value] = selector;
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else allQueries[mode][property][value] += ','+selector;
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}
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function getQuery() {
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var query;
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if (document.querySelectorAll) query = document.querySelectorAll.bind(document);
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if (!query && 'undefined' !== typeof $$) query = $$;
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if (!query && 'undefined' !== typeof jQuery) query = jQuery;
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if (!query) {
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throw 'No document.querySelectorAll, jQuery or Mootools\'s $$ found.';
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}
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return query;
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}
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/**
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* Start the magic. Go through all collected rules (readRules()) and attach the resize-listener.
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*/
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function findElementQueriesElements() {
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var query = getQuery();
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for (var mode in allQueries) if (allQueries.hasOwnProperty(mode)) {
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for (var property in allQueries[mode]) if (allQueries[mode].hasOwnProperty(property)) {
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for (var value in allQueries[mode][property]) if (allQueries[mode][property].hasOwnProperty(value)) {
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var elements = query(allQueries[mode][property][value]);
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for (var i = 0, j = elements.length; i < j; i++) {
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setupElement(elements[i], {
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mode: mode,
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property: property,
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value: value
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});
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}
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}
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}
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}
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}
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/**
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*
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* @param {HTMLElement} element
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*/
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function attachResponsiveImage(element) {
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var children = [];
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var rules = [];
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var sources = [];
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var defaultImageId = 0;
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var lastActiveImage = -1;
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var loadedImages = [];
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for (var i in element.children) {
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if(!element.children.hasOwnProperty(i)) continue;
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if (element.children[i].tagName && element.children[i].tagName.toLowerCase() === 'img') {
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children.push(element.children[i]);
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var minWidth = element.children[i].getAttribute('min-width') || element.children[i].getAttribute('data-min-width');
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//var minHeight = element.children[i].getAttribute('min-height') || element.children[i].getAttribute('data-min-height');
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var src = element.children[i].getAttribute('data-src') || element.children[i].getAttribute('url');
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sources.push(src);
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var rule = {
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minWidth: minWidth
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};
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rules.push(rule);
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if (!minWidth) {
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defaultImageId = children.length - 1;
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element.children[i].style.display = 'block';
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} else {
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element.children[i].style.display = 'none';
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}
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}
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}
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lastActiveImage = defaultImageId;
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function check() {
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var imageToDisplay = false, i;
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for (i in children){
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if(!children.hasOwnProperty(i)) continue;
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if (rules[i].minWidth) {
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if (element.offsetWidth > rules[i].minWidth) {
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imageToDisplay = i;
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}
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}
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}
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if (!imageToDisplay) {
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//no rule matched, show default
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imageToDisplay = defaultImageId;
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}
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if (lastActiveImage != imageToDisplay) {
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//image change
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if (!loadedImages[imageToDisplay]){
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//image has not been loaded yet, we need to load the image first in memory to prevent flash of
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//no content
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var image = new Image();
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image.onload = function() {
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children[imageToDisplay].src = sources[imageToDisplay];
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children[lastActiveImage].style.display = 'none';
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children[imageToDisplay].style.display = 'block';
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loadedImages[imageToDisplay] = true;
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lastActiveImage = imageToDisplay;
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};
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image.src = sources[imageToDisplay];
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} else {
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children[lastActiveImage].style.display = 'none';
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children[imageToDisplay].style.display = 'block';
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lastActiveImage = imageToDisplay;
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}
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} else {
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//make sure for initial check call the .src is set correctly
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children[imageToDisplay].src = sources[imageToDisplay];
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}
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}
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element.resizeSensor = new ResizeSensor(element, check);
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check();
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if (trackingActive) {
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elements.push(element);
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}
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}
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function findResponsiveImages(){
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var query = getQuery();
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var elements = query('[data-responsive-image],[responsive-image]');
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for (var i = 0, j = elements.length; i < j; i++) {
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attachResponsiveImage(elements[i]);
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}
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}
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var regex = /,?[\s\t]*([^,\n]*?)((?:\[[\s\t]*?(?:min|max)-(?:width|height)[\s\t]*?[~$\^]?=[\s\t]*?"[^"]*?"[\s\t]*?])+)([^,\n\s\{]*)/mgi;
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var attrRegex = /\[[\s\t]*?(min|max)-(width|height)[\s\t]*?[~$\^]?=[\s\t]*?"([^"]*?)"[\s\t]*?]/mgi;
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/**
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* @param {String} css
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*/
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function extractQuery(css) {
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var match, smatch, attrs, attrMatch;
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css = css.replace(/'/g, '"');
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while (null !== (match = regex.exec(css))) {
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smatch = match[1] + match[3];
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attrs = match[2];
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while (null !== (attrMatch = attrRegex.exec(attrs))) {
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queueQuery(smatch, attrMatch[1], attrMatch[2], attrMatch[3]);
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}
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}
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}
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/**
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* @param {CssRule[]|String} rules
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*/
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function readRules(rules) {
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var selector = '';
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if (!rules) {
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return;
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}
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if ('string' === typeof rules) {
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rules = rules.toLowerCase();
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if (-1 !== rules.indexOf('min-width') || -1 !== rules.indexOf('max-width')) {
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extractQuery(rules);
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}
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} else {
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for (var i = 0, j = rules.length; i < j; i++) {
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if (1 === rules[i].type) {
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selector = rules[i].selectorText || rules[i].cssText;
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if (-1 !== selector.indexOf('min-height') || -1 !== selector.indexOf('max-height')) {
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extractQuery(selector);
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}else if(-1 !== selector.indexOf('min-width') || -1 !== selector.indexOf('max-width')) {
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extractQuery(selector);
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}
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} else if (4 === rules[i].type) {
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readRules(rules[i].cssRules || rules[i].rules);
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} else if (3 === rules[i].type) {
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readRules(rules[i].styleSheet.cssRules);
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}
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}
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}
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}
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var defaultCssInjected = false;
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/**
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* Searches all css rules and setups the event listener to all elements with element query rules..
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*
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* @param {Boolean} withTracking allows and requires you to use detach, since we store internally all used elements
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* (no garbage collection possible if you don not call .detach() first)
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*/
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this.init = function(withTracking) {
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trackingActive = typeof withTracking === 'undefined' ? false : withTracking;
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for (var i = 0, j = document.styleSheets.length; i < j; i++) {
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try {
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readRules(document.styleSheets[i].cssRules || document.styleSheets[i].rules || document.styleSheets[i].cssText);
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} catch(e) {
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if (e.name !== 'SecurityError') {
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throw e;
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}
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}
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}
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if (!defaultCssInjected) {
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var style = document.createElement('style');
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style.type = 'text/css';
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style.innerHTML = '[responsive-image] > img, [data-responsive-image] {overflow: hidden; padding: 0; } [responsive-image] > img, [data-responsive-image] > img { width: 100%;}';
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document.getElementsByTagName('head')[0].appendChild(style);
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defaultCssInjected = true;
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}
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findElementQueriesElements();
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findResponsiveImages();
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};
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/**
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*
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* @param {Boolean} withTracking allows and requires you to use detach, since we store internally all used elements
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* (no garbage collection possible if you don not call .detach() first)
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*/
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this.update = function(withTracking) {
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this.init(withTracking);
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};
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this.detach = function() {
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if (!trackingActive) {
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throw 'withTracking is not enabled. We can not detach elements since we don not store it.' +
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'Use ElementQueries.withTracking = true; before domready or call ElementQueryes.update(true).';
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}
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var element;
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while (element = elements.pop()) {
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ElementQueries.detach(element);
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}
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elements = [];
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};
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};
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/**
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*
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* @param {Boolean} withTracking allows and requires you to use detach, since we store internally all used elements
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* (no garbage collection possible if you don not call .detach() first)
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*/
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ElementQueries.update = function(withTracking) {
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ElementQueries.instance.update(withTracking);
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};
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/**
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* Removes all sensor and elementquery information from the element.
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*
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* @param {HTMLElement} element
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*/
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ElementQueries.detach = function(element) {
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if (element.elementQueriesSetupInformation) {
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//element queries
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element.elementQueriesSensor.detach();
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delete element.elementQueriesSetupInformation;
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delete element.elementQueriesSensor;
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} else if (element.resizeSensor) {
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//responsive image
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element.resizeSensor.detach();
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delete element.resizeSensor;
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} else {
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//console.log('detached already', element);
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}
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};
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ElementQueries.withTracking = false;
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ElementQueries.init = function() {
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if (!ElementQueries.instance) {
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ElementQueries.instance = new ElementQueries();
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}
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ElementQueries.instance.init(ElementQueries.withTracking);
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};
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var domLoaded = function (callback) {
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/* Internet Explorer */
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/*@cc_on
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@if (@_win32 || @_win64)
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document.write('<script id="ieScriptLoad" defer src="//:"><\/script>');
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document.getElementById('ieScriptLoad').onreadystatechange = function() {
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if (this.readyState == 'complete') {
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callback();
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}
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};
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@end @*/
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/* Mozilla, Chrome, Opera */
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if (document.addEventListener) {
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document.addEventListener('DOMContentLoaded', callback, false);
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}
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/* Safari, iCab, Konqueror */
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else if (/KHTML|WebKit|iCab/i.test(navigator.userAgent)) {
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var DOMLoadTimer = setInterval(function () {
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if (/loaded|complete/i.test(document.readyState)) {
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callback();
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clearInterval(DOMLoadTimer);
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}
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}, 10);
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}
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/* Other web browsers */
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else window.onload = callback;
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};
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ElementQueries.listen = function() {
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domLoaded(ElementQueries.init);
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};
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return ElementQueries;
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}));
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