使用jQuery推迟或承诺等待多个$ .post调用完成
我正在尝试做三个jQuery帖子,将它们的结果设置为它们范围之外的变量,然后在所有三个都返回之后,如果它们成功,则执行另一个函数。现在,我正在嵌套嵌套的回调,如果可能的话,我想摆脱它。
我查看了有关jQuery Promise和Deferreds的文档,但是还没有弄清楚如何将其与$ .post函数一起使用。
我当前的代码:
var workout, diet, feedbackvar postobj = { id: workoutId };
$.post("./RowingWorkouts/GetWorkoutUsingId", postobj, function(result) {
workout = result;
$.post("./Diet/GetDietUsingId", postobj, function(result) {
diet = result;
$.post("./RowingWorkouts/GetWorkoutFeedback", postobj, function(result) {
feedback = result;
renderCharts(workout, diet, feedback);
});
});
});
我想做什么(伪代码):
var workout, diet, feedbackvar postobj = { id: workoutId };
var getWorkout = $.post("./RowingWorkouts/GetWorkoutUsingId", postobj, function(result) {
workout = result;
});
var getDiet = $.post("./Diet/GetDietUsingId", postobj, function(result) {
diet = result;
});
var getFeedback = $.post("./RowingWorkouts/GetWorkoutFeedback", postobj, function(result) {
feedback = result;
});
// When all three are successful - I haven't gotten the when syntax to actually work yet
$.when(All3AreSuccessful).doThisOrSomething(renderCharts(workout, diet, feedback));
如果有更优雅的方法,我也很乐意切换代码。我想开始使用Promise并立即进行延迟,因为即使此代码简单易懂,而且嵌套的回调很容易理解,我还是希望学习一个新工具并尽快进行切换。
回答:
使用$ .when
var postobj = { id: workoutId
};
var getWorkout = $.post("./RowingWorkouts/GetWorkoutUsingId", postobj);
var getDiet = $.post("./Diet/GetDietUsingId", postobj);
var getFeedback = $.post("./RowingWorkouts/GetWorkoutFeedback", postobj);
// When all three are successful - I haven't gotten the when syntax to actually work yet
$.when(getWorkout, getDiet, getFeedback).done(function (workout, diet, feedback) {
//each of the parameter is an array
renderCharts(workout[0], diet[0], feedback[0])
});
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