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 7. Formularios
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Introducción
Los formularios recogen las entradas del usuario que se envían a una URL remota o a un punto final de la API. Los navegadores modernos incorporan muchos tipos de formularios para introducir texto, números, colores, etc. Un formulario es una de las principales formas de obtener información de tu usuario.
FormData
La API FormData proporciona un modelo de datos para acceder a los datos de los formularios. Te ahorra la molestia de tener que buscar elementos individuales del DOM y obtener sus valores.
Aún mejor, una vez que tengas un objeto FormData, puedes pasarlo directamente a la API de obtención para enviar el formulario. Antes de enviarlo, puedes modificar o añadir datos al objetoFormData objeto.
Validación
Para evitar que los usuarios envíen datos no válidos, puedes (y debes) añadir validación del lado del cliente a tus formularios. Puede ser algo tan sencillo como marcar un campo como obligatorio, o una lógica de validación más compleja que implique coordinar varios valores del formulario o llamar a una API.
Antes, un desarrollador solía tener que recurrir a una biblioteca JavaScript para realizar la validación de formularios. Esto podía causar dolores de cabeza debido a la duplicación de datos, que existe en los datos del formulario y en un objeto en memoria utilizado por la biblioteca de validación.
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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.