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