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Ilya Kantor 2019-07-02 00:11:08 +03:00
parent 5c56e0d54b
commit 94c83e9e50
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2-ui/4-forms-controls/3-events-change-input/article.md
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@ -4,7 +4,7 @@ Let's cover various events that accompany data updates.
## Event: change ## Event: change
The [change](http://www.w3.org/TR/html5/forms.html#event-input-change) event triggers when the element has finished changing. The `change` event triggers when the element has finished changing.
For text inputs that means that the event occurs when it loses focus. For text inputs that means that the event occurs when it loses focus.
@ -15,11 +15,21 @@ For instance, while we are typing in the text field below -- there's no event. B
<input type="button" value="Button"> <input type="button" value="Button">
``` ```
For other elements: `select`, `input type=checkbox/radio` it triggers right after the selection changes. For other elements: `select`, `input type=checkbox/radio` it triggers right after the selection changes:
```html autorun height=40 run
<select onchange="alert(this.value)">
<option value="">Select something</option>
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
```
## Event: input ## Event: input
The `input` event triggers every time a value is modified. The `input` event triggers every time after a value is modified.
Unlike keyboard events, it triggers on any value change, even those that does not involve keyboard actions: pasting with a mouse or using speech recognition to dictate the text. Unlike keyboard events, it triggers on any value change, even those that does not involve keyboard actions: pasting with a mouse or using speech recognition to dictate the text.
@ -50,7 +60,7 @@ These events occur on cutting/copying/pasting a value.
They belong to [ClipboardEvent](https://www.w3.org/TR/clipboard-apis/#clipboard-event-interfaces) class and provide access to the data that is copied/pasted. They belong to [ClipboardEvent](https://www.w3.org/TR/clipboard-apis/#clipboard-event-interfaces) class and provide access to the data that is copied/pasted.
We also can use `event.preventDefault()` to abort the action. We also can use `event.preventDefault()` to abort the action, then nothing gets copied/pasted.
For instance, the code below prevents all such events and shows what we are trying to cut/copy/paste: For instance, the code below prevents all such events and shows what we are trying to cut/copy/paste:
@ -64,11 +74,13 @@ For instance, the code below prevents all such events and shows what we are tryi
</script> </script>
``` ```
Technically, we can copy/paste everything. For instance, we can copy a file in the OS file manager, and paste it. Please note, that it's possible to copy/paste not just text, but everything. For instance, we can copy a file in the OS file manager, and paste it.
There's a list of methods [in the specification](https://www.w3.org/TR/clipboard-apis/#dfn-datatransfer) to work with different data types, read/write to the clipboard. There's a list of methods [in the specification](https://www.w3.org/TR/clipboard-apis/#dfn-datatransfer) that can work with different data types including files, read/write to the clipboard.
But please note that clipboard is a "global" OS-level thing. Most browsers allow read/write access to the clipboard only in the scope of certain user actions for the safety. Also it is forbidden to create "custom" clipboard events in all browsers except Firefox. But please note that clipboard is a "global" OS-level thing. Most browsers allow read/write access to the clipboard only in the scope of certain user actions for the safety.
Also it's forbidden to generate "custom" clipboard events with `dispatchEvent` in all browsers except Firefox.
## Summary ## Summary