QuerySelector in JavaScript

QuerySelector is a method in JavaScript that allows you to search and select elements on a web page using CSS selectors.

Syntax

The syntax for QuerySelector is as follows:

document.querySelector(CSS_Selector);

Here, CSS_Selector is the CSS selector that you would like to use to select the element(s) on the web page.

Example

Suppose you want to select the first paragraph on a web page. You can use the following code snippet:

const firstParagraph = document.querySelector('p');

Similarly, if you want to select all the elements with the class name "container", you can use the following code snippet:

const allContainers = document.querySelectorAll('.container');

Differences between QuerySelector and QuerySelectorAll

The key difference between QuerySelector and QuerySelectorAll, which is another method that allows you to select elements on the web page using a CSS selector, is that QuerySelector only selects the first element matching the CSS selector, while QuerySelectorAll selects all the elements that match the CSS selector.

Conclusion

QuerySelector is a powerful method in JavaScript that allows you to select elements on a web page using CSS selectors. With this method, you can easily manipulate the content of the web page and create dynamic and interactive web applications.