Fetching Elements
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Lecture 158:- Fetching Elements
To fetch an element from the DOM using JavaScript, you can use various methods, such as getElementById, getElementsByClassName, getElementsByTagName, querySelector, and querySelectorAll.
Here's a brief explanation of each method:
getElementById(): This method returns the first element that has the ID attribute with the specified value. The method takes a string argument that represents the ID of the element.getElementsByClassName(): This method returns a collection of elements that have the specified class name. The method takes a string argument that represents the class name.getElementsByTagName(): This method returns a collection of elements that have the specified tag name. The method takes a string argument that represents the tag name.querySelector(): This method returns the first element that matches a specified CSS selector. The method takes a string argument that represents the CSS selector.querySelectorAll(): This method returns a static NodeList containing all elements that match a specified CSS selector. The method takes a string argument that represents the CSS selector.
Here's an example of fetching an element by its ID and changing its text content using JavaScript:
htmlCopy code
<!DOCTYPE html>
<html>
<head>
<title>Fetching an Element</title>
</head>
<body>
<h1 id="myHeading">Hello World!</h1>
<script>
// Fetching an element by ID
const heading = document.getElementById('myHeading');
// Changing the text content of the element
heading.textContent = 'Hello JavaScript!';
</script>
</body>
</html>
In this example, the getElementById method is used to fetch the element with the ID of myHeading, and the textContent property is used to change the text content of the element.
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