Angular Animation Triggers: Basics and Advanced Features

Primary entry point exports

Functions - trigger

The "trigger" function in the Angular Animation API is used to create a named animation trigger. This trigger contains a list of state() and transition() entries that are evaluated when the expression bound to the trigger changes. The function returns an object encapsulating the trigger data.

Here's a detailed breakdown of the trigger function and its usage:

    trigger(name: string, definitions: AnimationMetadata[]): AnimationTriggerMetadata

Parameters:

    name (string):

        - An identifying string for the animation trigger.

    definitions (AnimationMetadata[]):

        - An animation definition object containing an array of state() and transition() declarations.

Returns:

    AnimationTriggerMetadata:

        - An object that encapsulates the trigger data.

Usage Notes:

    Define in Component Metadata:

        - Define an animation trigger in the animations section of "@Component" metadata.

    Bind in Template:

        - In the template, reference the trigger by name and bind it to a trigger expression using the format [@triggerName]="expression".
        - Animation trigger bindings convert all values to strings, and then match the previous and current values against any linked transitions.
        - Booleans can be specified as 1 or true and 0 or false.

Usage Example:


In this example, an animation trigger named "myAnimationTrigger" is defined within the "@Component" metadata. It contains states and transitions. The template associated with this component uses the defined trigger by binding it to an element within the template code.

Using an Inline Function:

The transition animation method supports reading an inline function to decide if its associated animation should run.


Disabling Animations:

    @.disabled Binding:

        - When "@.disabled" is true, it prevents all animations from rendering on the element and any inner animation triggers within the element.


Disable Animations Application-wide:

    - Disable all animations for an app by placing a host binding set on "@.disabled" on the topmost Angular component.


Overriding Disablement of Inner Animations:

    - Despite inner animations being disabled, a parent animation can query() for inner elements located in disabled areas of the template and still animate them if needed.

Detecting when an Animation is Disabled:

    - If animations are disabled, the ".disabled" flag on the "AnimationEvent" is true.

This comprehensive explanation covers the creation and usage of animation triggers, including binding, inline functions, disabling animations, and application-wide control.

Source: https://angular.io/api/animations/trigger#trigger

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