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Ilya Kantor 2019-05-14 10:26:21 +03:00
parent f5f31e8e08
commit 899a3cea20
2 changed files with 18 additions and 14 deletions
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6
2-ui/2-events/01-introduction-browser-events/article.md
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@ -160,9 +160,9 @@ button.onclick = sayThanks;
button.onclick = sayThanks();
```
If we add brackets, then `sayThanks()` -- will be the *result* of the function execution, so `onclick` in the last code becomes `undefined` (the function returns nothing). That won't work.
If we add parentheses, `sayThanks()` -- is a function call. So the last line actually takes the *result* of the function execution, that is `undefined` (as the function returns nothing), and assigns it to `onclick`. That doesn't work.
...But in the markup we do need the brackets:
...But in the markup we do need the parentheses:
```html
<input type="button" id="button" onclick="sayThanks()">
@ -351,7 +351,7 @@ Some properties of `event` object:
: Event type, here it's `"click"`.
`event.currentTarget`
: Element that handled the event. That's exactly the same as `this`, unless you bind `this` to something else, and then `event.currentTarget` becomes useful.
: Element that handled the event. That's exactly the same as `this`, unless the handler is an arrow function, or its `this` is bound to something else, then `event.currentTarget` becomes useful.
`event.clientX / event.clientY`
: Window-relative coordinates of the cursor, for mouse events.