JavaScript Events JAVASCRIPT
- JavaScript Introduction
- JavaScript Syntax
- JavaScript innerHTML
- JavaScript document.write()
- Javascript - window.alert()
- JavaScript - console.log()
- JavaScript Comments
- JavaScript Variables
- JavaScript Operators
- JavaScript Data Types
- JavaScript Functions
- JavaScript Objects
- JavaScript Events
- JavaScript Strings
- JavaScript String Methods
- JavaScript Numbers
- JavaScript Number Methods
- JavaScript Arrays
- JavaScript Array Methods
- JavaScript Sorting Arrays
- JavaScript Array Iteration
- JavaScript Date Objects
- JavaScript Date Formats
- JavaScript Get Date Methods
- JavaScript Set Date Methods
- JavaScript Math Object
- JavaScript Conditions
- JavaScript Switch
- JavaScript Loop For
- JavaScript While Loop
- JavaScript Break and Continue
- JavaScript Type Conversion
- JavaScript Errors
- JavaScript Scope
- JavaScript this Keyword
- JavaScript Classes
- JavaScript Debugging
- JavaScript - Changing CSS
- JavaScript JSON
JavaScript Events
HTML Events
An HTML event can be something the browser does or something a user does.
Here are some examples of HTML events:
- An HTML web page has finished loading
- An HTML input field was changed
- An HTML button was clicked
Often, when events happen, you may want to do something.
JavaScript lets you execute code when events are detected.
HTML allows event handler attributes, with JavaScript code, to be added to HTML elements.
With single quotes:
With double quotes:
In the following example, an onclick attribute (with code), is added to a <button> element:
In the example above, the JavaScript code changes the content of the element with id="demo".
In the next example, the code changes the content of its own element (using this.innerHTML):
JavaScript code is often several lines long. It is more common to see event attributes calling functions:
Example
<button onclick="document.getElementById('demo').innerHTML = Date()">The time is?</button>
<button onclick="this.innerHTML = Date()">The time is?</button>
<button onclick="displayDate()">The time is?</button>
Common HTML Events
Here is a list of some common HTML events:
| Event | Description |
|---|---|
| onchange | An HTML element has been changed |
| onclick | The user clicks an HTML element |
| onmouseover | The user moves the mouse over an HTML element |
| onmouseout | The user moves the mouse away from an HTML element |
| onkeydown | The user pushes a keyboard key |
| onload | The browser has finished loading the page |
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