Only "get element by ID" selector is working... In java script

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Only document.getElementbyID is working. no other JS DOM selector is working

What I have tried:

HTML

<!DOCTYPE html>
<html>
    <head></head>
    <body>
        <div>
            <h1 ></h1>
            <h1 id="test"></h1>
            
        </div>
        <script src="test.js"></script>
    </body>
</html>

JavaScript

document.querySelectorAll('h1').innerHTML="Hello";
document.getElementsByTagName('h1').innerHTML="test";
document.getElementById('test').innerHTML="hello";

Posted 29-Jul-21 7:51am

Arslan Anjum 2021

Updated 29-Jul-21 21:50pm

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Chris Copeland · Accepted Answer · 2021-07-29T21:50:00

You need to start reading the documentation for the functions that you're calling. If you don't understand what the return values of these methods are then you'll constantly need to ask for support.

Document.querySelectorAll() - Web APIs | MDN[^]
Document.getElementsByTagName() - Web APIs | MDN[^]

Unlike your previous question[^] these functions return a collection of values, which means there could be more than one result. You can't call .innerHTML on a collection, you need to iterate over them:

JavaScript

const matches = document.querySelectAll('h1');

for (let i = 0; i < matches.length; i++) {
  matches[i].innerHTML = 'I am a header #' + i;
}