DOMRectList: length property

{{APIRef("Geometry Interfaces")}}

The read-only length property of the {{domxref("DOMRectList")}} interface returns the number of {{domxref("DOMRect")}} objects in the list.

Value

A positive integer representing the count of DOMRect objects in the DOMRectList. If there are no rectangles in the list, length is 0.

Examples

In the following example, we retrieve the list of rectangles for a {{htmlelement("div")}} element using {{domxref("Element.getClientRects()")}}. We then display the number of rectangles in the list within another <div> element on the page.

First, the HTML:

<div id="box"></div>
<div id="output"></div>

#box {
  width: 50px;
  height: 20px;
  border: 1px solid black;
}

Now the JavaScript:

const box = document.getElementById("box");
const rects = box.getClientRects();
const output = document.getElementById("output");

output.textContent = `Number of rectangles: ${rects.length}`;

The output looks like this:

{{ EmbedLiveSample('Examples', '100%', 60) }}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}