[英]Position relative div getting different offset
我有以下html,我得到每個div的topOffset
,但是position:relative
div下的子div正在獲得意外的offset
,我無法刪除position
,任何幫助/解決方案都很好。
我正在嘗試在一些具有offset
隨機生成div上設置一些js
行為。
注意:我只能使用javascript
而不是jq
。
document.getElementById('demo').innerHTML = document.getElementById('div1').offsetTop + " " + document.getElementById('div2').offsetTop + " " + document.getElementById('div2-child').offsetTop;
* { box-sizing: border-box; } html, body { margin: 0; padding: 0; } #div1 { border: 1px solid #000; padding: 10px; position: relative; } #div2 { border: 1px solid #000; padding: 10px; margin-top: 5px; position: relative; } #div2-child { border: 1px solid #000; padding: 10px; margin-top: 5px; }
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit? <div id="div1">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit?</div> <div id="div2"> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit? <div id="div2-child">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit?</div> </div> <p id=demo></p>
如MDN中所述, HTMLElement.offsetTop
返回相對於父元素的位置。 因此,在您的示例document.getElementById('div2-child').offsetTop
返回相對於div2
頂部位置
因此,如果要相對於window(viewport)的位置,則需要添加帶有其父位置的子位置,如下所示:
document.getElementById('demo').innerHTML = document.getElementById('div1').offsetTop + " " + document.getElementById('div2').offsetTop + " " + (document.getElementById('div2-child').offsetParent.offsetTop + document.getElementById('div2-child').offsetTop);
或者您可以如下使用element.getBoundingClientRect() :
document.getElementById('demo').innerHTML = document.getElementById('div1').offsetTop + " " + document.getElementById('div2').offsetTop + " " + (document.getElementById('div2-child').getBoundingClientRect().top);
/**
* Get the position of an element relative to the document body
*/
function absoluteOffset(el) {
var offset = el.offsetTop
var offsetParent = el.offsetParent
if (offsetParent === document.body) {
return offset
}
return offset + absoluteOffset(offsetParent)
}
var div1 = document.getElementById('div1') var div2 = document.getElementById('div2') var div2Child = document.getElementById('div2-child') document.getElementById('demo').innerHTML = absoluteOffset(div1) + ' ' + absoluteOffset(div2) + ' ' + absoluteOffset(div2Child) /** * Get the position of an element relative to the document body */ function absoluteOffset(el) { var offset = el.offsetTop var offsetParent = el.offsetParent if (offsetParent === document.body) { return offset } return offset + absoluteOffset(offsetParent) }
* { box-sizing: border-box; } html, body { margin: 0; padding: 0; } #div1 { border: 1px solid #000; padding: 10px; position: relative; } #div2 { border: 1px solid #000; padding: 10px; margin-top: 5px; position: relative; } #div2-child { border: 1px solid #000; padding: 10px; margin-top: 5px; }
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit? <div id="div1">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit?</div> <div id="div2"> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit? <div id="div2-child">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem, harum, officia quam magni provident tempora debitis mollitia placeat ducimus atque nobis fugit voluptatibus nisi commodi doloremque hic perspiciatis sint odit?</div> </div> <p id=demo></p>
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