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How to add an ID to element in JavaScript

Fahad Farid

IDs are essential in JavaScript. They refer to a particular element compatible with the getElementById() method, which returns it with the given property.

IDs should be unique within a page, and all elements within a page should have an ID even though it is not necessary.

You can add an ID to a new JavaScript Element or a pre-existing HTML Element.

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Adding ID to a pre-existing HTML element

First, you need to find the element. This can be done using:

  • document.getElementsByTagName()
  • document.getElementsByClassName()
  • document.querySelectorAll()

Once you have the element, you can edit its contents with the following code:

var intro = document.getElementsByClassName(‘intro’); intro.setAttribute(‘id’, ‘Introduction_ 1’)

Adding ID to a new HTML element

First, create a new element. This can be done within HTML or with JavaScript. Use:

const terms = document.createElement(‘p’);

This will create a new element to store a paragraph. Then, use the following to assign an id:

terms.setAttribute(‘id’,‘para-1’);

You can also add multiple other attributes such as:

terms.setAttribute(‘class’, ‘Class-s-m-x’);

This method will assign the id para-1 to the element and move it to the Class-s-m-x class so that the appropriate formatting can be applied.

Using HTML

You can add an id using HTML by typing the following:

<p id= “para-1”>

This method helps declare the ids and class names while developing the frontend. It is used to quickly apply the same formatting to multiple elements of the same class.

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