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[英]How do I create a callback function for when the fading function is done?
[英]in jquery $.when(ajax).done(function(){do sth}, how can i callback twice to the same callback function?
在jQuery中,我有以下代码:
A部分:
$.when(result = $.startAsyncRequest(arg)).done(function(){
console.log(result); // this should be called every time something is returned
if (result.hasOwnProperty("responseJSON")){
console.log("build frontend table using completed task");
}
});
B部分:
jQuery.extend({
startAsyncRequest: function(arg){
console.log(arg);
$.when(result = makeAjaxRequest(arg)).done(function(){
var taskid = result.taskid;
var taskurl = "someurl" + taskid;
startProgressBar(taskurl, {
onSuccess: function(){
$.when(result2 = makeAjaxRequest(taskid)).done(function(){
console.log("received completed task");
return result2;
});
});
return "starting progress bar";
});
return "started task";
}
});
A部分启动一个功能(B部分),该功能包含几个ajax发布请求,所有这些请求均被推迟。 进度条完成后,将基于回调发出这些请求之一。
每当startAsyncRequest返回时,我希望它返回到A部分并将结果记录到控制台。 因此,我希望它会返回几次,但它只会返回一次(第一个请求,“开始的任务”)。
有没有办法做到这一点?
我不想将startAsyncRequest分解为一个以上的函数,因为A部分在我的代码中重复很多,并且我希望它将所有任务调用,进度条和任务检索逻辑包装在一个函数中。
解决方案是-
A部分:
$.startAsyncRequest(arg, function(result){
console.log(result); // this should be called every time something is returned
if (result.hasOwnProperty("responseJSON")){
console.log("build frontend table using completed task");
}
});
B部分:
jQuery.extend({
startAsyncRequest: function(arg, callbackFct){
console.log(arg);
$.when(result = makeAjaxRequest(arg)).done(function(){
var taskid = result.taskid;
var taskurl = "someurl" + taskid;
startProgressBar(taskurl, {
onSuccess: function(){
$.when(result2 = makeAjaxRequest(taskid)).done(function(){
console.log("received completed task");
callbackFct(result2);
});
});
return callbackFct("starting progress bar");
});
return callbackFct("started task");
}
});
检查一下: https : //api.jquery.com/category/deferred-object/
function wrap(ajaxRequest){
var defer = $.Deferred();
ajaxRequest.done(function(resp){
defer.notify({ "message" : "Done Success", resp : resp })
}).fail(function(resp){
defer.notify({ "message" : "Error Failure", resp : resp });
});
setTimeout(function(){
defer.notify({ "message" : "Request is made", resp : null });
})
return defer.promise();
}
/// Calling function
wrap($.ajax({
// params
})).progress(function(obj){
console.log(obj)
})
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