February 2022
Beginner to intermediate
784 pages
24h 53m
Korean
Content preview from 자바스크립트 완벽 가이드
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JavaScript
494
15장 웹 브라우저의 자바스크립트
드에는 이벤트 핸들러에 반환 값이 있고, 그 반환 값은 일반적으로 브라우저에 이
벤트와 연관된 기본 동작을 수행하지 말라는 신호 구실을 합니다. 예를 들어 폼의
전송 버튼에 있는
onclick
핸들러가
false
를 반환한다면(보통 이벤트 핸들러가 사
용자 입력이 클라이언트 사이드 유효성 검사를 만족하지 못한다고 판단했을 때) 웹
브라우저는 폼을 전송하지 않습니다.
브라우저의 기본 동작을 막는 표준 방법은 이벤트 객체에서
preventDefault()
메
서드(15.2.5절)를 호출하는 겁니다.
이벤트 대상의 이벤트 타입 하나에 이벤트 핸들러를 하나 이상 등록할 수 있습니
다. 등록된 타입의 이벤트가 일어나면 브라우저는 핸들러를 등록된 순서대로 호출
합니다. 흥미로운 사실은
addEventListener()
로 등록된 이벤트 핸들러와 객체 프
로퍼티로 등록된 이벤트 핸들러가 섞여 있어도 마찬가지로 순서를 지킨다는 것입
니다.
15.2.4
이벤트 대상이 Window 객체, 또는 기타 독립된 객체라면 브라우저는 이벤트에 반
응해 그 객체에 적절한 핸들러를 호출하기만 합니다. 반면 이벤트 대상이 Docu-
ment 객체, 또는 그에 포함된 Element 객체라면 상황이 좀 복잡해집니다.
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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.