How do I set an attribute in JavaScript?

The setAttribute() method of the Element interface sets the value of an attribute on the specified element. If the attribute already exists, the value is updated; otherwise a new attribute is added with the specified name and value. To get the current value of an attribute, use getAttribute(); to remove an attribute, call removeAttribute().

How to modify an attribute in JavaScript?

It is used to add an attribute and provide it with a value to a specific element. If the attribute already exists, it just modifies or sets its value. Here we are initializing the element in JavaScript by getting its id and then using setAttribute () to modify its attribute. Example: In this example, we are using setAttribute () Method. Output:

How to add a data attribute in JavaScript?

To add a data attribute in JavaScript, you can use the `setAttribute()` method. For example, if you want to add a 'data-single' attribute, do `ele.setAttribute("data-single", "true")`; The element will now have `data-single="true"` in its markup.