231 lines
9.9 KiB
JavaScript
231 lines
9.9 KiB
JavaScript
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/*!
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* @copyright Copyright (c) 2017 IcoMoon.io
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* @license Licensed under MIT license
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* See https://github.com/Keyamoon/svgxuse
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* @version 1.2.6
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*/
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/*jslint browser: true */
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/*global XDomainRequest, MutationObserver, window */
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(function () {
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"use strict";
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if (typeof window !== "undefined" && window.addEventListener) {
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var cache = Object.create(null); // holds xhr objects to prevent multiple requests
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var checkUseElems;
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var tid; // timeout id
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var debouncedCheck = function () {
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clearTimeout(tid);
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tid = setTimeout(checkUseElems, 100);
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};
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var unobserveChanges = function () {
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return;
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};
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var observeChanges = function () {
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var observer;
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window.addEventListener("resize", debouncedCheck, false);
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window.addEventListener("orientationchange", debouncedCheck, false);
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if (window.MutationObserver) {
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observer = new MutationObserver(debouncedCheck);
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observer.observe(document.documentElement, {
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childList: true,
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subtree: true,
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attributes: true
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});
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unobserveChanges = function () {
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try {
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observer.disconnect();
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window.removeEventListener("resize", debouncedCheck, false);
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window.removeEventListener("orientationchange", debouncedCheck, false);
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} catch (ignore) {}
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};
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} else {
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document.documentElement.addEventListener("DOMSubtreeModified", debouncedCheck, false);
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unobserveChanges = function () {
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document.documentElement.removeEventListener("DOMSubtreeModified", debouncedCheck, false);
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window.removeEventListener("resize", debouncedCheck, false);
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window.removeEventListener("orientationchange", debouncedCheck, false);
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};
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}
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};
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var createRequest = function (url) {
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// In IE 9, cross origin requests can only be sent using XDomainRequest.
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// XDomainRequest would fail if CORS headers are not set.
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// Therefore, XDomainRequest should only be used with cross origin requests.
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function getOrigin(loc) {
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var a;
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if (loc.protocol !== undefined) {
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a = loc;
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} else {
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a = document.createElement("a");
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a.href = loc;
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}
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return a.protocol.replace(/:/g, "") + a.host;
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}
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var Request;
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var origin;
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var origin2;
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if (window.XMLHttpRequest) {
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Request = new XMLHttpRequest();
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origin = getOrigin(location);
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origin2 = getOrigin(url);
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if (Request.withCredentials === undefined && origin2 !== "" && origin2 !== origin) {
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Request = XDomainRequest || undefined;
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} else {
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Request = XMLHttpRequest;
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}
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}
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return Request;
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};
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var xlinkNS = "http://www.w3.org/1999/xlink";
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checkUseElems = function () {
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var base;
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var bcr;
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var fallback = ""; // optional fallback URL in case no base path to SVG file was given and no symbol definition was found.
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var hash;
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var href;
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var i;
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var inProgressCount = 0;
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var isHidden;
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var Request;
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var url;
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var uses;
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var xhr;
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function observeIfDone() {
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// If done with making changes, start watching for chagnes in DOM again
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inProgressCount -= 1;
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if (inProgressCount === 0) { // if all xhrs were resolved
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unobserveChanges(); // make sure to remove old handlers
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observeChanges(); // watch for changes to DOM
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}
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}
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function attrUpdateFunc(spec) {
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return function () {
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if (cache[spec.base] !== true) {
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spec.useEl.setAttributeNS(xlinkNS, "xlink:href", "#" + spec.hash);
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if (spec.useEl.hasAttribute("href")) {
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spec.useEl.setAttribute("href", "#" + spec.hash);
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}
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}
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};
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}
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function onloadFunc(xhr) {
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return function () {
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var body = document.body;
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var x = document.createElement("x");
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var svg;
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xhr.onload = null;
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x.innerHTML = xhr.responseText;
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svg = x.getElementsByTagName("svg")[0];
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if (svg) {
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svg.setAttribute("aria-hidden", "true");
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svg.style.position = "absolute";
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svg.style.width = 0;
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svg.style.height = 0;
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svg.style.overflow = "hidden";
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body.insertBefore(svg, body.firstChild);
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}
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observeIfDone();
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};
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}
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function onErrorTimeout(xhr) {
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return function () {
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xhr.onerror = null;
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xhr.ontimeout = null;
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observeIfDone();
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};
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}
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unobserveChanges(); // stop watching for changes to DOM
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// find all use elements
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uses = document.getElementsByTagName("use");
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for (i = 0; i < uses.length; i += 1) {
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try {
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bcr = uses[i].getBoundingClientRect();
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} catch (ignore) {
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// failed to get bounding rectangle of the use element
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bcr = false;
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}
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href = uses[i].getAttribute("href")
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|| uses[i].getAttributeNS(xlinkNS, "href")
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|| uses[i].getAttribute("xlink:href");
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if (href && href.split) {
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url = href.split("#");
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} else {
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url = ["", ""];
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}
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base = url[0];
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hash = url[1];
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isHidden = bcr && bcr.left === 0 && bcr.right === 0 && bcr.top === 0 && bcr.bottom === 0;
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if (bcr && bcr.width === 0 && bcr.height === 0 && !isHidden) {
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// the use element is empty
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// if there is a reference to an external SVG, try to fetch it
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// use the optional fallback URL if there is no reference to an external SVG
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if (fallback && !base.length && hash && !document.getElementById(hash)) {
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base = fallback;
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}
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if (uses[i].hasAttribute("href")) {
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uses[i].setAttributeNS(xlinkNS, "xlink:href", href);
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}
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if (base.length) {
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// schedule updating xlink:href
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xhr = cache[base];
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if (xhr !== true) {
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// true signifies that prepending the SVG was not required
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setTimeout(attrUpdateFunc({
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useEl: uses[i],
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base: base,
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hash: hash
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}), 0);
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}
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if (xhr === undefined) {
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Request = createRequest(base);
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if (Request !== undefined) {
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xhr = new Request();
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cache[base] = xhr;
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xhr.onload = onloadFunc(xhr);
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xhr.onerror = onErrorTimeout(xhr);
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xhr.ontimeout = onErrorTimeout(xhr);
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xhr.open("GET", base);
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xhr.send();
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inProgressCount += 1;
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}
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}
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}
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} else {
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if (!isHidden) {
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if (cache[base] === undefined) {
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// remember this URL if the use element was not empty and no request was sent
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cache[base] = true;
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} else if (cache[base].onload) {
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// if it turns out that prepending the SVG is not necessary,
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// abort the in-progress xhr.
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cache[base].abort();
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delete cache[base].onload;
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cache[base] = true;
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}
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} else if (base.length && cache[base]) {
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setTimeout(attrUpdateFunc({
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useEl: uses[i],
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base: base,
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hash: hash
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}), 0);
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}
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}
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}
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uses = "";
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inProgressCount += 1;
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observeIfDone();
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};
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var winLoad;
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winLoad = function () {
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window.removeEventListener("load", winLoad, false); // to prevent memory leaks
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tid = setTimeout(checkUseElems, 0);
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};
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if (document.readyState !== "complete") {
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// The load event fires when all resources have finished loading, which allows detecting whether SVG use elements are empty.
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window.addEventListener("load", winLoad, false);
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} else {
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// No need to add a listener if the document is already loaded, initialize immediately.
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winLoad();
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}
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}
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}());
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