Element: getAttribute() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Thuộc tính getAttribute() method of the
Element interface trả về the value of a specified attribute on the
element.
If the given attribute does not exist, the value returned will be null.
If you need to inspect the Attr node's properties, you can use the getAttributeNode() method instead.
Cú pháp
getAttribute(attributeName)
Tham số
attributeName-
The name of the attribute whose value you want to get.
Giá trị trả về
Một chuỗi chứa the value of attributeName if the attribute exists, otherwise null.
Ví dụ
<!-- example div in an HTML DOC -->
<div id="div1">Hi Champ!</div>
const div1 = document.getElementById("div1");
// <div id="div1">Hi Champ!</div>
const exampleAttr = div1.getAttribute("id");
// "div1"
const lang = div1.getAttribute("lang");
// null
Mô tả
Lower casing
When called on an HTML element in a DOM flagged as an HTML document,
getAttribute() lower-cases its argument before proceeding.
Retrieving nonce values
For security reasons, CSP nonces from non-script
sources, such as CSS selectors, and .getAttribute("nonce") calls are
hidden.
let nonce = script.getAttribute("nonce");
// trả về empty string
Instead of retrieving the nonce from the content attribute, use the
nonce property:
let nonce = script.nonce;
Đặc tả kỹ thuật
| Specification |
|---|
| DOM # ref-for-dom-element-getattribute① |