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A Basic Introduction to JavaScript and Mouse Events

Once you are comfortable with referencing different elements in the HTML document using the DOM (Document Object Model), the next step is to connect the manipulation of the elements in teh DOM to events. JavaScript has many events that can be connected to blocks of code:

  1. onclick
  2. ondblclick
  3. onmousedown
  4. onmousemove
  5. onmouseout
  6. onmouseover

Example Event

If we had the following HTML document:

<!doctype html>
<html>
<head>
    <title>The JavaScript DOM</title>
</head>
<body>

  <h1 id="heading">The JavaScript DOM</h1>

  <p id="paragraph">Mauris convallis dictum odio. Quisque euismod finibus.</p>

  <a id="link" href="https://codeadam.ca">codeadam.ca</a>
  
  <button id="button">Click Me!</button>
    
</body>
</html>

If we wanted to change the colour of the h1 element when the button element is clicked, we would first create a reference to the button element:

var button = document.getElementById('button');

And then add an event listener:

button.addEventListener("click",function(){
  document.getElementById("heading").styles.color = "red";
});

Trying It Out

Create a new HTML document, add four div elements. Add the following four events and DOM manipulation:

  1. Change the background-colour of the first div elements is clicked.
  2. Change the background-colour of the second div element when the mouse enters.
  3. Change the background-colour of the third div element when the mouse leaves.
  4. Change the background-colour of the fourth div element when double clicked.

Full tutorial URL:
https://codeadam.ca/learning/javascript-mouse-events.html

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