October 2024
Intermediate to advanced
286 pages
5h 48m
Spanish
Content preview from Libro de recetas de la API web
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Capítulo 6. Observación de los elementos del DOM
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Introducción
Este capítulo de examina tres tipos de observadores que el navegador te proporciona para observar los elementos del DOM: MutationObserver, IntersectionObserver, y ResizeObserver. Estos objetos observadores pueden vigilar los elementos del DOM y notificarte determinados cambios o eventos.
Los observadores se crean con una función de llamada de retorno. Esta función se llama cada vez que se producen eventos relevantes en la página. Se llama con una o varias entradas que contienen información sobre lo ocurrido. Esto sólo crea el observador. Para empezar realmente a observar un elemento, tienes que llamar a observe en el observador, pasándole el elemento que quieres observar y un conjunto opcional de opciones.
Observador de mutaciones
MutationObserver busca cambios en el DOM de un elemento. Puedes vigilar los cambios en:
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Elementos hijos
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Atributos
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Contenido del texto
Lo que observa el navegador se define en un objeto de opciones que se pasa a la función observe. También puedes dar una opción subtree al observar un elemento. Esto amplía el monitoreo de elementos hijos, atributos y/o contenido de texto a todos los nodos descendientes (en lugar de sólo al elemento y sus hijos directos).
Cuando se produce una mutación que te interesa, tu llamada de retorno se ejecuta con una matriz de objetos MutationEntry ...
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