Javascript calling function from inside same function

Question

I have a function that does several DDBB calls, so it is asynchronous.

I need to call the function and check a data value (winner) in the JSON object it returns. If it is true i need to call the function again until winner == false.

I can't use while because it is not asynchronous, how can i do this?

  someFunction(function(result) {
     // if result.winner == true repeat 
  })

Put the call to the function inside the success where the results are actually returned. — bob-fornal
– bob-fornal, Commented Dec 21, 2014 at 11:57
Could you include the whole code snippet ? I'm specifically referring to the function which gets the code from the database. — JKaan
– JKaan, Commented Dec 21, 2014 at 11:59
@fornal you mean calling the function from inside the same function? — Egidi
– Egidi, Commented Dec 21, 2014 at 12:09

dfsq · Accepted Answer · 2014-12-21 12:17:51Z

6

You can call the same callback function again until condition is true:

someFunction(function repeat(result) {
    if (result.winner) {
        someFunction(repeat);
    }
});

Check the demo below.

someFunction(function repeat(result) {
    document.body.innerHTML += '<br>' + result.winner;
    if (result.winner) {
        someFunction(repeat);
    }
});

var results = [true, true, true, false];
function someFunction(callback) {
    setTimeout(function() {
        callback({winner: results.shift()});
    }, (Math.random() + 1) * 1000 | 0);
}

answered Dec 21, 2014 at 12:17

dfsq

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YuraA · Accepted Answer · 2014-12-22 14:32:11Z

0

Have you looked at async.js? It has several control flow async functions. You probably want to look into whilst, doWhilst, until, doUntil:

https://github.com/caolan/async#whilst

whilst(test, fn, callback)

Repeatedly call fn, while test returns true. Calls callback when stopped, or an error occurs.

answered Dec 22, 2014 at 14:32

YuraA

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