[up-observe] - Unpoly

Watches form fields and runs a callback when a value changes.

Only fields with a [name] attribute can be watched.

Example

The following logs a message whenever the <input> changes:

<input name="query" up-observe="console.log('New value', value)">

The script given to [up-observe] runs with the following context:

Name	Type	Description
`this`	`Element`	The changed form field
`name`	`string`	The `[name]` of the changed field
`value`	`string`	The new value of the changed field

You can set [up-observe] on any element to observe all contained fields. The name argument contains the name of the field that was changed.