What is the querySelector method in Javascript and how to use it?
The querySelector helps you to find first first element that matches css selector you specify. So basically it lets you find html elements.
const header = document.querySelector("h1");
You can also use # (hash means id).
const myid = document.querySelector("#myid");
To search a class use a dot.
const myClass = document.querySelector(".class");
How to use the querySelector() method
-
- The
querySelector()
method takes a CSS selector as its argument and returns the first element that matches the selector. - The CSS selector can be a tag name, an ID, or a class name.
- For example, the following code will get the first
h1
element on the page:
- The
const header = document.querySelector("h1");
- The
querySelector()
method can also be used to get multiple elements that match a selector. To do this, you can use thequerySelectorAll()
method.
Key Takeaways
- The
querySelector()
method is a powerful tool that can be used to find elements on a page. - The
querySelector()
method can be used to find elements by their tag name, ID, or class name. - The
querySelector()
method can also be used to find multiple elements that match a selector.
FAQs
- Q: What is the difference between the
querySelector()
method and thegetElementById()
method?- The
querySelector()
method can find elements by their tag name, ID, or class name, while thegetElementById()
method can only find elements by their ID.
- The
- Q: What is the difference between the
querySelector()
method and thequerySelectorAll()
method?- The
querySelector()
method returns the first element that matches the selector, while thequerySelectorAll()
method returns all elements that match the selector.
- The
- Q: What are some common CSS selectors?
- Some common CSS selectors include:
h1
: This selector will match allh1
elements on the page.#myid
: This selector will match the element with the IDmyid
..class
: This selector will match all elements with the classclass
.
- Some common CSS selectors include: