To update #box in <p>, I need to give a random value to the (keyup) attribute.
Here's an example:
<!-- The value on the right of equality sign for (keyup) doesn't matter -->
<input #box (keyup)="some_random_value" placeholder="something">
<p>{{box.value}}</p>
But if, for instance, I have
<input #box placeholder="something">
<p>{{box.value}}</p>
Then #box won't get updated at all?
In the middle of theUser Input sectionof the official documentation, there is an explanation provided (look for (keyup)="0"). Angular2 has made an effort to enhance performance by only triggering change detection when a UI event occurs if it detects that some action has been taken in response to the event. Simply having a binding for the event is enough to qualify, even if the binding itself does not have any actual functionality.
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