jQuery的AJAX回调推迟订单 [英] jQuery ajax deferred callback orders
问题描述
我无法得到完成/失败/回调总是在我的每一个Ajax请求延期对象的回调之前执行的。
I cannot get the done/fail/always callbacks on each of my ajax requests to execute before the deferred object's callbacks.
我的问题是,我的一些Ajax请求可能会失败,但我需要执行相同的code一个人是否失败或没有失败。
The problem I have is that some of my ajax requests may fail, but I need to execute the same code whether one fails or none fail.
很难准确解释,所以我做了这个小提琴,以帮助证明我有这个问题。 http://jsfiddle.net/zZsxV/
Hard to explain exactly, so I made this fiddle to help show the problem I am having. http://jsfiddle.net/zZsxV/
var a1 = $.Deferred();
var a2 = $.Deferred();
var a3 = $.Deferred();
a1.done(function() {
$('body').append('a1 done<br />');
}).fail(function() {
$('body').append('a1 fail<br />');
}).always(function() {
$('body').append('a1 always<br />');
});
a2.done(function() {
$('body').append('a2 done<br />');
}).fail(function() {
$('body').append('a2 fail<br />');
}).always(function() {
$('body').append('a2 always<br />');
});
a3.done(function() {
$('body').append('a3 done<br />');
}).fail(function() {
$('body').append('a3 fail<br />');
}).always(function() {
$('body').append('a3 always<br />');
});
var def = $.when(a1, a2, a3);
def.always(function() {
$('body').append('defer always <-- should be after all<br />');
});
setTimeout(function() {
a1.resolve();
}, 5000);
setTimeout(function() {
a2.reject();
}, 1000);
setTimeout(function() {
a3.resolve();
}, 3000);
我读了很多关于这一主题的答案,但我不相信任何正好符合我的需要。
I read a lot of the answers on this topic but I don't believe any fit my need exactly.
需要帮助,请让我知道,我会加一次我回来的任何详细信息。先谢谢了。
Any more information needed to help please let me know and I'll add it once I get back. Thanks in advance.
我不明白发生了什么。我只知道如何做到这一点,以避免这个问题。我尝试使用。那么,以及具有相同的结果。一旦一个请求被拒绝了,它会等待对方回调之前失败的回调。
I do understand what is happening. I just know how to do it to avoid this problem. I tried using .then as well with the same results. Once one request is rejected, it fires the fail callback before waiting for the other callbacks.
推荐答案
根据 jQuery的文档 $。当
触发回调时,无论所有强>参数得到解决或一个被拒绝。因此,如何利用类似的东西,而不是 $当
:
According to jQuery documentation $.when
fires callbacks when either all of parameters are resolved or one of them is rejected. So how about using something like that instead of $.when
:
var custom_when = function() {
var args = $.makeArray(arguments);
var callback = args.pop();
var all = [];
$.each(args, function(index, def) {
def.always(function() {
var idx = all.indexOf(def);
if (idx !== -1) {
all.splice(idx, 1);
}
if (!all.length) {
callback();
}
});
all.push(def);
});
};
和您可以使用它这样的:
and you can use it like that:
custom_when(a1, a2, a3, function() {
// do some stuff.
});
这篇关于jQuery的AJAX回调推迟订单的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!