Angular Animation: Harnessing the Query Function

Primary entry point exports

Functions - query

The "query" function in Angular Animation is used to find one or more inner elements within the current element being animated in a sequence. This function is particularly powerful when used with the animate() function. Here's a detailed explanation with a different example:

Syntax:

Parameters:

    1. selector (required): The element to query or a set of elements specified with Angular-specific tokens. Tokens include ":enter", ":leave", ":animating", "@triggerName", "@*", and ":self".

    2. animation (required): One or more animation steps to apply to the queried element or elements. An array is treated as an animation sequence.

    3. options (optional): An options object, including the "limit" field to limit the total number of items to collect. Default is "null".

Example:

Usage Explanation:

In this example, the "query" function is used within a component that contains inner elements to be animated individually. The "queryAnimation" trigger is activated when the "goAnimate" method is called.

1. Hiding Inner Elements:

    - The "query" function is used to hide the inner elements (h1 and .content) initially by setting their opacity to 0.

2. Animating Inner Elements In:

    - Subsequently, another "query" function is used to animate the inner elements in one by one, gradually revealing them with a fade-in effect.

Usage Notes:

    1. Multiple Tokens: Tokens can be combined in a single query selector string, allowing for versatile element selection.

    2. Options: The "options" object includes a "limit" field to control the total number of items to be collected.

    3. Error Handling: By default, the "query" function throws an error when zero items are found. The "optional" flag in the options object can be set to true to ignore this error.

    4. Entering and Leaving Elements: The ":enter" and ":leave" tokens query for newly inserted or removed elements, but not all elements can be queried via these tokens. The mentioned tokens are suitable for elements inserted dynamically or those with structural directives.

The "query" function is a versatile tool for selecting and animating inner elements within an Angular component, providing fine-grained control over animations and transitions.

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