50 lines
1.5 KiB
HTML
50 lines
1.5 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<title>Poppable Doctest</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link rel="stylesheet" href="../lib/3rdparty/highlight/styles/default.css">
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<link rel="stylesheet" href="../css/doctest.css">
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<script src="../lib/3rdparty/highlight/highlight.pack.js"></script>
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<script src="../lib/3rdparty/all.js"></script>
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<script src="all.js"></script>
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</head>
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<body id="page" onload="Doctest.run()">
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<h1>
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Poppables
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</h1>
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<p>
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Poppables present information on demand in a given context. This
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is an abstract base class for Popup menus and other contextual information
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like image highlights. It's main purpose is to ensure that only
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one poppable at a time can be shown in a given context. Note
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that in an application multiple poppables can be shown in different context
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at the same time.
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</p>
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<p>Let's look at an example of a popup class. In this class the register
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method is called by the constructor. The class also implements a close
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method which is called if the second poppable is registered.
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<script class="doctest">
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class ConcretePoppable extends Poppable {
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constructor(context) {
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super()
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this.register(context)
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}
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close() {
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alert("closed")
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}
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}
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let context = window
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let a = new ConcretePoppable(context)
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let b = new ConcretePoppable(context)
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</script>
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</p>
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</body>
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