Question 49644 in Javascript Question posted in
A very good W3school tutorial can be found here.

Keep checking if a function returns true in local storage – Javascript

I’m trying to check if a function returns true in an if/else statement, however I want to keep checking if the function returns true and when it does to execute the code…

How would I go about this? I have tried setInterval and setTimeout and it won’t repeat, unless I’m missing something…

I have also tried a while loop but this is inefficient and crashes the browser…

However if I use an setInterval() how would I clear it once x returns true?

Here is a snippet of my code for an example.

function x() {
    if (localStorage.getItem("a") === null) {
        return false;
    } else {
        return true;
    }
}

if (!x()) {
    console.log("Returned True!");
    update();
} else {
    console.log("False");
}
Tags:

2

Answers


  1. 0

    setInterval() should work

    function x() {
    return localStorage.getItem("a") !== null;
}

let interval = setInterval(() => {
    if (x()) {
        console.log("Returned True!");
        update();
        clearInterval(interval);
    } else {
        console.log("False");
    }
}, 500);
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  2. 0

    Are you calling your function in the interval like x() or x?

    function x() {
    if (localStorage.getItem("a") === null) {
        return false;
    } else {
        return true;
    }
}

setInterval(x(), 1000);
setInterval(x, 1000);

    The first will run once the second till you clear it

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