javascript - How to make onclick event to work only once

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javascript - How to make onclick event to work only once

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

what I want to do is when someone click anywhere in the page. A new window will open, but I want this to happen only once, so when someone click again on body, the function should not run. Any advice? No jquery please.

<!DOCTYPE html>
<html>
<body onclick="myFunction()">
<script>
    function myFunction() {
        window.open("http://www.w3schools.com");
    }
</script>
</body>
</html>

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1 Answer

深蓝 · Answer 1 · 2021-10-23T19:38:21+0000

A short solution:

<body onclick="myFunction(); this.onclick=null;">

Check it:

<button onclick="myFunction(); this.onclick=null;">This button works only once</button>
<button onclick="myFunction()">This button works always</button>

<script>

    function myFunction() {
        console.log("hello");
    }

</script>

</body>

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javascript - How to make onclick event to work only once

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