HTMLElement.offsetLeft
Свойство offsetLeft содержит левое смещение элемента относительно offsetParent. Содержит расстояние от offsetParent до границы элемента.
For block-level elements, offsetTop
, offsetLeft
, offsetWidth
, and offsetHeight
describe the border box of an element relative to the offsetParent
.
However, for inline-level elements (such as span) that can wrap from one line to the next, offsetTop
and offsetLeft
describe the positions of the first border box (use Element.getClientRects()
to get its width and height), while offsetWidth
and offsetHeight
describe the dimensions of the bounding border box (use Element.getBoundingClientRect()
to get its position). Therefore, a box with the left, top, width and height of offsetLeft
, offsetTop
, offsetWidth
and offsetHeight
will not be a bounding box for a span with wrapped text.
Syntax
left = element.offsetLeft;
left
is an integer representing the offset to the left in pixels from the closest relatively positioned parent element.
Example
var colorTable = document.getElementById("t1");
var tOLeft = colorTable.offsetLeft;
if (tOLeft > 5) {
// large left offset: do something here
}
This example shows a 'long' sentence that wraps within a div with a blue border, and a red box that one might think should describe the boundaries of the span.
<div
style="width: 300px; border-color:blue; border-style:solid; border-width:1;">
<span>Short span. </span>
<span id="longspan">Long span that wraps within this div.</span>
</div>
<div
id="box"
style="position: absolute; border-color: red; border-width: 1; border-style: solid; z-index: 10"></div>
<script type="text/javascript">
var box = document.getElementById("box");
var longspan = document.getElementById("longspan");
box.style.left = longspan.offsetLeft + document.body.scrollLeft + "px";
box.style.top = longspan.offsetTop + document.body.scrollTop + "px";
box.style.width = longspan.offsetWidth + "px";
box.style.height = longspan.offsetHeight + "px";
</script>
Specification
Specification |
---|
CSSOM View Module # dom-htmlelement-offsetleft |
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