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Implementing JavaScript in HTML Pages

Interacting with HTML Elements

JavaScript allows us to interact with HTML elements, making our web pages dynamic and interactive.

To access HTML elements using JavaScript, we can use methods like getElementById, querySelector, or getElementsByClassName. These methods allow us to select specific elements based on their ID, CSS selectors, or class names, respectively.

Once we have selected an HTML element, we can modify its properties using JavaScript. We can change the text content of an element by assigning a new value to its textContent property. We can also modify element styles by accessing the style property and setting specific CSS properties.

For example, to change the text of an element with the ID "myElement", we can write:

var element = document.getElementById("myElement");
element.textContent = "New text";

In addition to modifying properties, we can also add event listeners to HTML elements using JavaScript. Event listeners allow us to respond to user interactions, such as clicks or key presses. By adding event listeners, we can make our web pages interactive and respond to user actions.

To add an event listener to an HTML element, we can use the addEventListener method. This method takes two arguments: the event type to listen for, and a function to execute when the event occurs.

For example, to add a click event listener to a button with the ID "myButton", we can write:

var button = document.getElementById("myButton");
button.addEventListener("click", function() {
    console.log("Button clicked");

By interacting with HTML elements using JavaScript, we can create dynamic and engaging web pages that respond to user actions.