Accessing Elements (The older way)

The slide discusses older methods of accessing elements in the DOM, which are important for interacting with and manipulating web pages using JavaScript. The methods covered include getElementById, which selects a single element by its unique ID, getElementsByClassName, which selects all elements with a specific class name, and getElementsByTagName, which selects all elements with a specific tag name. These methods are crucial for working with older code or when a simpler approach is needed, although newer methods like QuerySelector and QuerySelectorAll offer more flexibility. In this slide, we discuss the older methods of accessing elements in the DOM. These methods are fundamental to understanding how to interact with and manipulate web pages using JavaScript. You want to run getElementById. This method selects a single element by its unique ID. It's one of the most straightforward ways to access an element in the DOM. When you use getElementById, the method returns the element that has the ID attribute with the specified value. Example, JavaScript const demoElement equals document.getElementById demo returns a single element with ID equals demo. Two, getElementsByClassName. This method is used to select all elements that have a specific class name. Unlike getElementById, which returns a single element, getElementsByClassName returns a live HTML collection of all elements with a specified class name. Example, JavaScript const demoElements equals document.getElementsByClassName demo. returns a collection of elements with class equals demo. Three, getElementsByTagName. Similar to getElementsByClassName, this method selects all elements with a specific tag name. It returns a live HTML collection of elements with the given tag name. Example, JavaScript const demoElements equals document.getElementsByTagName div. Slash returns a collection of div elements. These methods are crucial for accessing elements in the DOM, especially when dealing with older code bases or when a more straightforward approach is required. While newer methods like QuerySelector and QuerySelectorAll offer more flexibility, these traditional methods still play a vital role in DOM manipulation and are essential tools in a web developer's toolkit.