javascript 在angularjs中将参数传递给promise的回调
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Passing parameters to promise's callback in angularjs
提问by user3799365
I am trying to figure out is there is any way to pass in an index argument to a promise's callback function. For instance.
我想弄清楚是否有任何方法可以将索引参数传递给 Promise 的回调函数。例如。
serviceCall.$promise.then(function(object){
$scope.object = object;
});
Now I want to pass in an array index parameter as
现在我想传入一个数组索引参数作为
serviceCall.$promise.then(function(object,i){
$scope.object[i] = something;
});
Can this be done? Please let me know.
这能做到吗？请告诉我。
Here is the code below
这是下面的代码
StudyService.studies.get({id:
$routeParams.studyIdentifier}).$promise.then(function(study) {
$scope.study = study;
for(var i=0;i<study.cases.length;i++){
StudyService.executionsteps.get({id:
$routeParams.studyIdentifier,caseId:study.cases[i].id})
.$promise.then(function(executionSteps,i){
$scope.study.cases[i].executionSteps = executionSteps;
});
}
});
回答by Yaron Schwimmer
you can use a closurefor that.
您可以为此使用闭包。
for example, in your code, use something like:
例如，在您的代码中，使用以下内容：
function callbackCreator(i) {
return function(executionSteps) {
$scope.study.cases[i].executionSteps = executionSteps;
}
}
StudyService.studies.get({id: $routeParams.studyIdentifier})
.$promise.then(function(study) {
$scope.study = study;
for(var i=0;i<study.cases.length;i++) {
var callback = callbackCreator(i);
StudyService.executionsteps.get({id: $routeParams.studyIdentifier,caseId:study.cases[i].id})
.$promise.then(callback);
}
});
回答by Dylan
I've done something similar and I put a promise on each and then used $q.all()on the array of promises like:
我做了类似的事情，我对每一个都做了一个承诺，然后用$q.all()在一系列的承诺上，比如：
$q.all( arrayOfPromises )
.then(function(results) {
console.log(results[0], results[1], results[2]);
});
