JavaScript Answers

How to Use querySelector with IDs that are Numbers in JavaScript?

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To use querySelector with IDs that are numbers in JavaScript, we have to escape the unicode code point representation of the number.

For instance, we can write:

<div id='1'>
  hello world

Then we write:

const el = document.querySelector('#\\31');

to select the div with ID 1.

U+0031 is the Unicode code point of the character 1, so we pass in \31 , which is the escaped version of the Unicode code point representation of 1.

el should be the div with ID 1 as a result.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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