published: 22 May 2022
2 min read
How to check if an attribute exists using JavaScript
To check if an HTML element has a specific attribute, you can use the hasAttribute() method. This method returns true if the specified attribute exists, otherwise it returns false.
Let us say you have the following HTML element:
<a href='http://example.com' title='Example' data-role='self'>Example Page</a>
The following example checks if the title attribute of the anchor element exists:
const anchor = document.querySelector('a');
const isTitle = anchor.hasAttribute('title');
console.log(isTitle); // true
The hasAttribute() method also works for the HTML5 data-* attributes.
The following example demonstrates how you can use the hasAttribute() method to check if the anchor element has the data-role attribute:
const anchor = document.querySelector('a');
const isRole = anchor.hasAttribute('data-role');
console.log(isRole); // true
To check if an HTML element has any attributes, JavaScript provides the hasAttributes() method:
console.log(anchor.hasAttributes()); // true
The hasAttribute() method works in all modern browsers, and IE9 and above.
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How to check if an attribute exists using JavaScript
To check if an HTML element has a specific attribute, you can use the hasAttribute() method. This method returns true if the specified attribute exists, otherwise it returns false.
Let us say you have the following HTML element:
<a href='http://example.com' title='Example' data-role='self'>Example Page</a>
The following example checks if the title attribute of the anchor element exists:
const anchor = document.querySelector('a');
const isTitle = anchor.hasAttribute('title');
console.log(isTitle); // true
The hasAttribute() method also works for the HTML5 data-* attributes.
The following example demonstrates how you can use the hasAttribute() method to check if the anchor element has the data-role attribute:
const anchor = document.querySelector('a');
const isRole = anchor.hasAttribute('data-role');
console.log(isRole); // true
To check if an HTML element has any attributes, JavaScript provides the hasAttributes() method:
console.log(anchor.hasAttributes()); // true
The hasAttribute() method works in all modern browsers, and IE9 and above.
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JS Nooby
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