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50 lines
1.6 KiB
JavaScript
50 lines
1.6 KiB
JavaScript
(function () {
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// Set the name of the hidden property and the change event for visibility
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var hidden, visibilityChange;
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if (typeof document.hidden !== "undefined") { // Opera 12.10 and Firefox 18 and later support
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hidden = "hidden";
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visibilityChange = "visibilitychange";
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} else if (typeof document.mozHidden !== "undefined") {
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hidden = "mozHidden";
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visibilityChange = "mozvisibilitychange";
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} else if (typeof document.msHidden !== "undefined") {
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hidden = "msHidden";
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visibilityChange = "msvisibilitychange";
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} else if (typeof document.webkitHidden !== "undefined") {
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hidden = "webkitHidden";
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visibilityChange = "webkitvisibilitychange";
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}
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var Visible = {
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hidden: hidden,
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visibilityChange: visibilityChange,
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};
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Visible.isSupported = function () {
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return !(typeof(document.addEventListener) === "undefined" ||
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typeof document[hidden] === "undefined");
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};
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Visible.onChange = function (f, once) {
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document.addEventListener(visibilityChange, function (ev) {
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f(!document[hidden], ev);
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}, {
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once: once
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});
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};
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Visible.currently = function () {
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return !document[hidden];
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};
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if (typeof(module) !== 'undefined' && module.exports) {
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module.exports = Visible;
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} else if ((typeof(define) !== 'undefined' && define !== null) && (define.amd !== null)) {
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define(function () {
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return Visible;
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});
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} else {
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window.Visible = Visible;
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}
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}());
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