Initiating actions

HTML elements can trigger any number of application actions in response to any number of events.

Furthermore, more than one element is allowed to initiate the same action.

An action notifies the application of "something" happening, but in itself does nothing at all.

All event types supported by the document object can be used, plus the following:

1. reveal - triggered when an element becomes visible in the viewport, on initial page load or after a scroll
2. conceal - triggered when an element leaves the viewport after a scroll
3. navigate - triggered by the history api
4. result - triggered after a successful request

Attributes

• any attribute that starts with on: and contains a space separated list of actions to initiate

Example

• moving the mouse cursor into the button initiates the doSomething action
• clicking the button initiates two actions: loadData and updateCounter
• nothing happens as a result, since none of the elements subscribe to either of these actions

<button on:mouseenter="doSomething"
        on:click="loadData updateCounter"
>
  click me
</button>