Question:
When does the anchor tag redirection happen given that multiple event listeners are attached to it?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Event listeners and Anchor tag</title>
</head>
<body>
<a id="demo" onclick="inlineHandler(event)" href="https://www.google.com">link demo</a>
</body>
<script>
const inlineHandler = (e) => {
console.log('inline Handler');
setTimeout(()=> {
console.log('This will not get executed as redirection would have been occurred by then.');
}, 1000);
}
const link = document.getElementById('demo');
link.addEventListener('click', (e) => {
console.log('event listener 1');
})
link.addEventListener('click', (e) => {
console.log('event listener 2');
// e.preventDefault();
})
link.addEventListener('click', (e) => {
console.log('event listener 3');
})
</script>
</html>
Learnings
- Inline handler always gets executed first.
- Event listeners (for the same element) are handled in the order they are written.
- Anchor tag redirection happens after the execution of all event listeners.
- If any of the event listener triggers preventDefault (irrespective of the order) then redirection won't happen.
Use case: Trigger analytics event on anchor tag link click.
I'll leave the guesswork for async code upto you. For any doubts or discussions, please feel free to comment. Thanks!
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