如何从元素的顶部获得距离?

时间:2012-08-04 04:44:01

标签: javascript

我想知道如何使用JavaScript从页面顶部而不是父元素获取元素的距离。
enter image description here

http://jsfiddle.net/yZGSt/1/

15 个答案:

答案 0 :(得分:77)

offsetTop仅查看元素的父级。只需遍历父节点,直到父母用完为止并加上他们的偏移量。

function getPosition(element) {
    var xPosition = 0;
    var yPosition = 0;

    while(element) {
        xPosition += (element.offsetLeft - element.scrollLeft + element.clientLeft);
        yPosition += (element.offsetTop - element.scrollTop + element.clientTop);
        element = element.offsetParent;
    }

    return { x: xPosition, y: yPosition };
}

答案 1 :(得分:10)

以下是一些有趣的代码:)



window.addEventListener('load', function() {
  //get the element
  var elem = document.getElementById('test');
  //get the distance scrolled on body (by default can be changed)
  var distanceScrolled = document.body.scrollTop;
  //create viewport offset object
  var elemRect = elem.getBoundingClientRect();
  //get the offset from the element to the viewport
  var elemViewportOffset = elemRect.top;
  //add them together
  var totalOffset = distanceScrolled + elemViewportOffset;
  //log it, (look at the top of this example snippet)
  document.getElementById('log').innerHTML = totalOffset;
});

#test {
  width: 100px;
  height: 100px;
  background: red;
  margin-top: 100vh;
}
#log {
  position: fixed;
  top: 0;
  left: 0;
  display: table;
  background: #333;
  color: #fff;
}
html,
body {
  height: 2000px;
  height: 200vh;
}

<div id="log"></div>
<div id="test"></div>
&#13;
&#13;
&#13;

答案 2 :(得分:8)

使用offsetTop

document.getElementById("foo").offsetTop

Demo

答案 3 :(得分:5)

var distanceTop = element.getBoundingClientRect().top;

有关详细信息,请访问链接:

https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect

答案 4 :(得分:5)

var elDistanceToTop = window.pageYOffset + el.getBoundingClientRect().top

根据我的经验document.body.scrollTop并不总是返回当前滚动位置(例如,如果滚动实际发生在不同的元素上)。

答案 5 :(得分:1)

(来源:Determine distance from the top of a div to top of window with javascript

<script type="text/javascript">
var myyElement = document.getElementById("myyy_bar");  //your element
var EnableConsoleLOGS = true;                          //to check the results in Browser's Inspector(Console), whenever you are scrolling



// ==============================================
window.addEventListener('scroll', function (evt) {
    var Positionsss =  GetTopLeft ();  
    if (EnableConsoleLOGS) { console.log(Positionsss); }
});
function GetOffset (object, offset) {
    if (!object) return;
    offset.x += object.offsetLeft;       offset.y += object.offsetTop;
    GetOffset (object.offsetParent, offset);
}
function GetScrolled (object, scrolled) {
    if (!object) return;
    scrolled.x += object.scrollLeft;    scrolled.y += object.scrollTop;
    if (object.tagName.toLowerCase () != "html") {          GetScrolled (object.parentNode, scrolled);        }
}

function GetTopLeft () {
    var offset = {x : 0, y : 0};        GetOffset (myyElement, offset);
    var scrolled = {x : 0, y : 0};      GetScrolled (myyElement.parentNode, scrolled);
    var posX = offset.x - scrolled.x;   var posY = offset.y - scrolled.y;
    return {lefttt: posX , toppp: posY };
}
// ==============================================
</script>

答案 6 :(得分:1)

offsetTop不会获得到页面顶部的距离,而是到具有指定位置的最接近的父元素的顶部的距离。

您可以使用一种简单的技术,将您感兴趣的元素的所有父元素的offsetTop加起来以获得距离。

// Our element
var elem = document.querySelector('#some-element');

// Set our distance placeholder
var distance = 0;

// Loop up the dom
do {
    // Increase our distance counter
    distance += elem.offsetTop;

    // Set the element to it's parent
    elem = elem.offsetParent;

} while (elem);
distance = distance < 0 ? 0 : distance;

来自https://gomakethings.com/how-to-get-an-elements-distance-from-the-top-of-the-page-with-vanilla-javascript/的原始代码

答案 7 :(得分:1)

滚动到元素的顶部;

var rect = element.getBoundingClientRect();
var offsetTop = window.pageYOffset + rect.top - rect.height;

答案 8 :(得分:1)

很容易 只是这样做:

选择您的元素

speed * direction

distance_fromTop将是元素到窗口顶部的距离 那么您可以轻松滚动到窗口的这一部分

使用此代码

let distance_fromTop = document.getElementById("ID_NAME").offsetTop;

小菜一碟:)

您的代码必须是这样

window.scrollTo( 0 , distance_fromTop );

答案 9 :(得分:0)

warning warning warning warning warning warning

“经典案例”-URL“ /#about-us”和div,其ID为“关于我们” 。在这种情况下,由默认锚点点击行为设置的最高位置(因此about-us div的最高位置为 0 )。您必须阻止默认设置(否则,您会为默认设置无效而感到疯狂-或在那里找到任何其他代码)。下面在“警告”下有更多详细信息。

1

少于30秒的解决方案(两行代码“ hello world”):

获取您的元素:

var element = document.getElementById("hello");

获取getBoundingClientRect();

Element.getBoundingClientRect()方法返回一个 元素及其相对于视口的位置。 https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect

var rect = element.getBoundingClientRect();

返回对象:

enter image description here

点符号top

var distance_from_top = rect.top; /* 1007.9971313476562 */

就这样。

2

StackOverflow噩梦2-将滚动位置设置为此值

再次出现“ hello world”(那里有8,000个答案-7,999个不起作用或很复杂)。

https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollTo

  window.scrollTo({
    top: element.getBoundingClientRect().top,
    behavior: 'smooth'
  });

根据需要向top添加偏移值(对于粘性导航栏)。

“ Hello World”代码段(获取距顶部视口的距离,然后单击到scrollTo

var element = document.getElementById("hello");
var rect = element.getBoundingClientRect();
var distance_from_top = rect.top; /* 50px */
console.log(distance_from_top);

function scrollTovView(){
  window.scrollTo({
    top: distance_from_top,
    behavior: 'smooth'
  });
}
div{
  text-align:center;
  border: 1px solid lightgray;
}
<button onclick="scrollTovView()">scrollTo to red DIV</button>
<div style="height: 50px;">50px height</div>
<div id="hello" style="width: 500px; height: 500px; background: red;"></div>

warning

scroll要与主锚导航栏“冲突”

例如,如果您使用此URL(用于锚定URL的ID)(顶部为0或“发疯”……),此技巧非常笨拙

www.mysite/about#hello
  window.scrollTo({
    top: element.getBoundingClientRect().top,
    behavior: 'smooth'
  });

要使此代码正常工作,您应该添加:

    if (this.hash !== "") {
      // Prevent default anchor click behavior
      event.preventDefault();

她的基本例子: https://www.w3schools.com/howto/howto_css_smooth_scroll.asp

答案 10 :(得分:0)

即使滚动窗口,此功能也会返回到页面顶部的距离。可以在事件侦听器中使用它。

const getElementYOffset = (element) => {
  const scrollOnWindow =
    window.pageYOffset !== undefined
      ? window.pageYOffset
      : (document.documentElement || document.body.parentNode || document.body)
          .scrollTop;
  const rect = element.getBoundingClientRect();
  let distanceFromTopOfPage = rect.top;
  if (scrollOnWindow !== 0) {
    distanceFromTopOfPage = rect.top + scrollOnWindow;
  }

  return distanceFromTopOfPage;
};

答案 11 :(得分:0)

这个oneliner似乎很好用

document.getElementById("el").getBoundingClientRect().top +  window.scrollY

your fiddle updated

答案 12 :(得分:-1)

简单的香草方式:

document.querySelector('your-element').getBoundingClientRect().top

答案 13 :(得分:-1)

虽然这是一个相当古老的讨论,但这在chrome / firefox / safari浏览器上运行良好:

window.addEventListener('scroll', function() {
   var someDiv = document.getElementById('someDiv');
   var distanceToTop = someDiv.getBoundingClientRect().top;
});

JSFiddle

上查看

答案 14 :(得分:-9)

使用jQuery的offset()方法:

$(element).offset().top

示例:http://jsfiddle.net/yZGSt/3/