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 1. API asíncronas
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Introducción
A muchas de las API que se tratan en este libro son asíncronas. Cuando llamas a una de estas funciones o métodos, es posible que no obtengas el resultado inmediatamente. Las distintas API tienen diferentes mecanismos para devolverte el resultado cuando esté listo.
Funciones de rellamada
El patrón asíncrono más básico es una función de devolución de llamada. Se trata de una función que pasas a una API asíncrona. Cuando finaliza el trabajo, llama a tu llamada de retorno con el resultado. Las retrollamadas pueden utilizarse solas o como parte de otros patrones asíncronos.
Eventos
Muchas API de los navegadores se basan en eventos. Un evento es algo que ocurre de forma asíncrona. Algunos ejemplos de eventos son:
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Se pulsó un botón.
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El ratón se movió.
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Se ha completado una solicitud de red.
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Se ha producido un error.
Un evento tiene un nombre, como click o mouseover, y un objeto con datos sobre el evento ocurrido. Puede incluir información como qué elemento se pulsó o un código de estado HTTP. Cuando escuchas un evento, proporcionas una función de devolución de llamada que recibe el objeto del evento como argumento.
Los objetos que emiten eventos implementan la interfaz EventTarget, que proporciona los métodos addEventListener y removeEventListener. Para escuchar un evento en un elemento u otro objeto, puedes llamar a ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.