DOM | Selecting Elements | Modifying Content | Event Handling | Event Listeners Examples
Selecting elements and modifying their content using JavaScript is a fundamental aspect of working with the DOM (Document Object Model). Here's a step-by-step guide with examples to help you understand how to achieve this.
Selecting Elements
JavaScript provides several methods to select DOM elements:
getElementById(): Selects an element by its unique ID.
getElementsByClassName(): Selects elements by their class name.
getElementsByTagName(): Selects elements by their tag name.
querySelector(): Selects the first element that matches a CSS selector.
querySelectorAll(): Selects all elements that match a CSS selector.
Modifying Content
Once you've selected elements, you can modify their content using properties like:
textContent: Sets or gets the text content of an element.
innerHTML: Sets or gets the HTML content of an element.
value: Sets or gets the value of input elements.
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Using getElementsByClassName()
Using getElementsByTagName()
Handling events and event listeners in JavaScript is essential for making web pages interactive. Events are actions that occur in the browser, such as clicks, form submissions, or key presses. Event listeners are functions that wait for these events to occur and then respond accordingly.
Basics of Event Handling
Events: Actions that happen in the browser (e.g., click, submit, mouseover).
Event Listeners: Functions that execute when an event occurs.
How to Add Event Listeners
You can add event listeners using the addEventListener() method. This method takes two arguments:
Event Type: The type of event to listen for (e.g., 'click', 'keydown').
Event Handler: The function to run when the event occurs.
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