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<title>Poppable Doctest</title>
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<h1><a href="index.html">lib.</a>Poppables</h1>
<p>
Poppables present information on demand in a given context. This is an abstract base class for Popup menus
and other contextual information like image highlights. It's main purpose is to ensure that only one
poppable at a time can be shown in a given context. Note that in an application multiple poppables can be
shown in different context at the same time.
</p>
<p>
Let's look at an example of a popup class. In this class the register method is called by the constructor.
The class also implements a close method which is called if the second poppable is registered.
<script class="doctest">
class ConcretePoppable extends Poppable {
constructor(context) {
super()
this.register(context)
}
close() {
alert('closed')
}
}
let context = window
let a = new ConcretePoppable(context)
let b = new ConcretePoppable(context)
</script>
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