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JavaScript

Posted by Henry Spock
Henry Spock
20,615 Points

What kind of code is "document.queryselector"? When I search JavaScript statements, I get DOM returns instead.

In addition, as it is a "selector", does that imply it is CSS? Meaning, does Javascript generally understand CSS selectors? And, if so, what other languages understand CSS selectors?

3 Answers

Nikos Papapetrou
Nikos Papapetrou
6,305 Points
Nikos Papapetrou
Nikos Papapetrou
6,305 Points

document.querySelector() is a method being use by JavaScript to access the HTML DOM: https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Introduction. You can access it also with css class, ids, tag names etc.

<button id="my-button" class = "btn-class"></button>

document.querySelector('button');  // tag name 
document.querySelector('#my-button');  // id
document.querySelector('.btn-class');  //class

You should look the course about DOM manipulation. It is a big topic and there are other methods you should learn. I think all the languages have their own methods to access the html dom, but JavaScript is widely used for it.

Henry Spock
Henry Spock
20,615 Points
Henry Spock
Henry Spock
20,615 Points

Thanks for the thorough answer Nikos! I thought it must be related to Document Object Model from searching, but I'm not confident about everything I'm seeing yet of course. I am taking notes though, and am going to include your answer in my file. I haven't gotten to DOM manipulation yet, but I will!

Nikos Papapetrou
Nikos Papapetrou
6,305 Points
Nikos Papapetrou
Nikos Papapetrou
6,305 Points

No worries! Glad to help you!