问题描述
我有我的父母和孩子控制器的HTTP请求：
I have an HTTP request in my parent and child controller:
家长控制
//Product is a $resource object that return http request as a promise.
Product.getItem()
.then(function(items) {
$scope.items = items
//do something in the parent controller.
})
儿童控制器
Product.getItem()
.then(function(items) {
$scope.items = items
//do something in the child controller
})
制品厂
angular.module('testApp').factory('Product', function($http,$q) {
var service = {}
service.getItem = function() {
return http.$get('api/url');
}
return service;
})
当我在某些网页儿童控制器启动。问题是，当我启动这些网页时，codeS将使双HTTP请求的API / URL，因为父母和孩子都控制器做出请求。虽然我的应用程序仍然有效，我不知道是否有更好的方法来解决它。感谢您的帮助！
Child controller is launched when I am in certain pages. The problem is when I launch those pages, the codes will make double http request to api/url because parent and child controllers both make the requests. Although my app still works, I was wondering if there is a better way to solve it. thanks for the help!
推荐答案
编辑：
我调查了菲尔的评论了一下，和固定（重写）我的例子。在底部的plunker反映这些变化。这里是更新code：
I investigated Phil's comments a bit, and fixed (rewrote) my example. The plunker at the bottom reflects these changes. Here is the updated code:
app.controller('MainCtrl', function($scope, getStore) {
getStore.get().then(function(data) {
$scope.data = data
})
});
app.controller('ChildCtrl', function($scope, $timeout, getStore) {
$timeout(function() {
getStore.get().then(function(data) {
$scope.test = data
})
},3000)
});
app.factory('getStore', function($http, $q) {
var self = this;
var data;
return {
get: function() {
if (data) {
console.log(data);
console.log('already got data')
return $q.when(data)
} else {
data = $http.get('test.json')
.then(function(response) {
console.log('fetched data')
return response.data;
})
return data
}
}
}
})
下面是一个解决方案 - 分开你的$ http.get到工厂并存储该值在那里。工厂都是单身，所以两个控制器可以访问和检查数据。
Here is one solution - separate your $http.get to a factory and store the value there. Factories are singletons, so both controllers can access and check the data.
JS：
app.controller('MainCtrl', function($scope, getStore) {
$scope.data = getStore.get()
});
app.controller('ChildCtrl', function($scope, $timeout, getStore) {
$timeout(function() {
$scope.data = getStore.get()
var check = getStore.checkData();
console.log('Data in store: ' + angular.toJson(check));
},1000)
$scope.getData = function() {
console.log(getStore.get());
}
});
app.factory('getStore', function($http) {
var self = this;
return {
data: undefined,
get: function() {
if (self.data) {
console.log('already got data')
return self.data
} else {
$http.get('test.json')
.success(function(data) {
console.log('no data found');
self.data = data;
console.log(self.data);
return self.data;
})
}
}
}
})
这只是运行一个检查，以查看该值是否已经存储或没有，然后返回它，如果它是的，如果不是，它得到，商店，并将其返回。
It just runs a check to see whether the value is already stored or not, and then returns it if it is, and if not, it gets, stores, and returns it.
这篇关于如何使多个HTTP请求？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！