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요소 offsetTop 속성

❮ 요소 개체

예시

<div> 요소의 offsetTop 위치를 가져옵니다.

var testDiv = document.getElementById("test");
document.getElementById("demo").innerHTML = testDiv.offsetTop;

정의 및 사용

offsetTop 속성은 offsetParent 요소의 상단에 상대적인 상단 위치(픽셀 단위)를 반환합니다.

반환된 값에는 다음이 포함됩니다.

  • 요소의 상단 위치 및 여백
  • offsetParent 요소의 상단 패딩, 스크롤바 및 테두리

참고: offsetParent 요소는 static 이 아닌 위치를 가진 가장 가까운 조상입니다.

팁: 요소의 왼쪽 위치를 반환하려면 offsetLeft 속성을 사용하십시오.


브라우저 지원

Property
offsetTop Yes 8.0 Yes Yes Yes

통사론

상단 오프셋 위치를 반환합니다.

object.offsetTop


기술적 세부 사항

기본값: 기본값 없음
반환 값: 요소의 상단 위치를 픽셀 단위로 나타내는 숫자
DOM 버전: CSSOM

더 많은 예

예시

<div> 요소의 위치 가져오기:

var testDiv = document.getElementById("test");
var demoDiv = document.getElementById("demo");
demoDiv.innerHTML = "offsetLeft: " + testDiv.offsetLeft + "<br>offsetTop: " + testDiv.offsetTop;

예시

고정 탐색 모음 만들기:

// Get the navbar
var navbar = document.getElementById("navbar");

// Get the offset position of the navbar
var sticky = navbar.offsetTop;

// Add the sticky class to the navbar when you reach its scroll position. Remove the sticky class when you leave the scroll position.
function myFunction() {
  if (window.pageYOffset  >= sticky) {
    navbar.classList.add("sticky")
  } else {
    navbar.classList.remove("sticky");
  }
}

❮ 요소 개체