Javascript Events | asadmukhtar.info

Javascript Events | asadmukhtar.info

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JavaScript Events

🔹 What are JavaScript Events?

JavaScript events are actions that occur in the browser, such as clicking a button, submitting a form, pressing a key, or moving the mouse. JavaScript allows us to handle and respond to these events dynamically.

🔹 Common JavaScript Events

Event	Description
`click`	Fires when an element is clicked.
`mouseover`	Fires when the mouse is over an element.
`mouseout`	Fires when the mouse leaves an element.
`keydown`	Fires when a key is pressed.
`keyup`	Fires when a key is released.
`change`	Fires when an input value changes.
`submit`	Fires when a form is submitted.
`load`	Fires when the page or an element loads.

🔹 Handling Events

1️⃣ Using HTML Attribute (Inline)

<button onclick="showMessage()">Click Me</button>

<script>
  function showMessage() {
    alert("Button Clicked!");
  }
</script>

💡 Not recommended for larger projects due to maintainability issues.

2️⃣ Using JavaScript (Event Listener)

<button id="myBtn">Click Me</button>

<script>
  document.getElementById("myBtn").addEventListener("click", function() {
    alert("Button was clicked!");
  });
</script>

💡 Preferred method for better code organization and separation.

3️⃣ Using onEvent Property

<button id="myButton">Click Me</button>

<script>
  document.getElementById("myButton").onclick = function() {
    alert("You clicked the button!");
  };
</script>

💡 This method overwrites any existing event handler.

🔹 Event Object (`event`)

When an event occurs, JavaScript automatically passes an event object containing details about the event.

<input type="text" id="inputBox" placeholder="Type something...">

<script>
  document.getElementById("inputBox").addEventListener("keydown", function(event) {
    console.log("Key pressed:", event.key);
  });
</script>

💡 The event.key property returns the key that was pressed.

🔹 Conclusion

JavaScript events handle user interactions on web pages.
Events can be added inline, using JavaScript, or event listeners.
The event object contains information about the event.
Use removeEventListener() to remove events dynamically.