多个ajax请求完成后触发回调 [英] Firing callback after multiple ajax requests are complete

问题描述

loadInfo: function(){
    var jsonCounter = 0,
    room = ['room1','room2','room3'],
    dates = [],
    prices = []

    $.each(booking.rooms, function(key, room_name) {
        $.getJSON('/get_info.php?room='+room_name, function(data) {
            dates[room_name] = data
            jsonCounter++
        })
        $.getJSON('/get_info.php?room='+room_name+'&prices', function(data) {
            prices[room_name] = data
            jsonCounter++
        })

    })

    function checkIfReady() {
        if (jsonCounter === rooms.length * 2) {
            clearInterval(timer)
            run_the_rest_of_the_app()
        }
    }

    var timer = setInterval(checkIfReady, 100)

}

(修改了很多，因为它是类等的一部分)

(Modified a lot, as it's part of a class etc etc.)

目前这感觉有点hackish，因为定时器的使用看起来很垃圾.我会使用 $.when 和 $.done，但我不知道可能有多少个房间，所以我不知道什么时候放.

At the moment this feels a bit hackish, as the timer usage seems rubbish. I would use $.when and $.done, but I don't know how many rooms there might be, so I don't know what to put into when.

如何确保 run_the_rest_of_the_app() 仅在所有 AJAX 请求返回后才被调用?

How do I ensure that run_the_rest_of_the_app() only gets called once all of the AJAX requests come back?

推荐答案

• var activeAJAX = 0;

  在进行 AJAX 调用之前，activeAJAX++;

  Before making an AJAX call, activeAJAX++;

  完成 AJAX 调用后(在回调中): if (--activeAJAX == 0) { allDone();}

  After completing an AJAX call (in the callback): if (--activeAJAX == 0) { allDone(); }

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