Quick Reference
The document.addEventListener() method attaches an event handler to a document.
<!-- html element to place output -->
<p id="my_output"></p>When the user clicks anywhere on the document page, the string “Hello World” will appear in the element with the #id my_output.
// variable
document.addEventListener('click', function() {
document.getElementById('my_output').innerHTML = 'Hello World';
});Output
Hello WorldSyntax
document.addEventListener(event, function, Capture)Parameters
| Parameter | Return Types |
|---|---|
| event | The event name; do not use the "on" prefix (click NOT onclick) (required) Any of these events are applicable |
| function | The function to run when the event occurs (required) |
| capture | true - the handler is executed in the capturing phase false - the handler is executed in the bubbling phase (default is false) |
JavaScript Notes:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.