Angular Animation API: State Function Overview

Primary entry point exports

Functions - state

The "state" function is part of the Angular Animation API and is used to declare an animation state within a trigger that is attached to an HTML element. This function allows you to define named states and associate them with specific styles. These states can then be used in conjunction with the "trigger" and "transition" functions to create animations in Angular applications.

Here is a detailed breakdown of the "state" function and its parameters:


Parameters:

    name (string):

        - One or more names for the defined state, provided as a comma-separated string.
        
        - Reserved state names can be used to define styles for specific use cases.
            
            - void: Used for styling when the element is detached from the application (e.g., when an ngIf evaluates to false).

            - * (asterisk): Indicates the default state. Styles associated with this name are used as the fallback when the animated state is not declared within the trigger.

    styles (AnimationStyleMetadata):

        A set of CSS styles associated with the state, created using the style() function. This set of styles persists on the element once the state has been reached.

    options (optional, object):

        - Parameters that can be passed to the state when it is invoked. This is an optional parameter, and it is an object containing 0 or more key-value pairs. The default is undefined.

Returns:

    AnimationStateMetadata:

        - An object that encapsulates the new state data.

Usage Notes:

    Register States:

        - Use the trigger() function to register states to an animation trigger.

    Animate Between States:

        - Use the transition() function to animate between different states.

    Persistent Styles:

        - When a state is active within a component, its associated styles persist on the element, even after the animation ends.

Example:


In this example, the "state" function is used within the "trigger" function to define various states (state1, state2, void, and *) along with associated styles. Transitions between these states are defined using the "transition" function. The component then uses this animation trigger in its metadata to enable animations.

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