Ajax 余烬:获取相互依赖的对象的数据
我正在尝试使用Ember为度量工具构建前端。到目前为止,我编写的代码在很大程度上受到了Eviltrout的emberreddit应用程序的影响 目标是有两个相互依赖的类:度量和过滤器 1) 一旦应用程序初始化,过滤器(过滤器类的实例)将从服务器加载。加载过滤器后,它们将在屏幕上显示为复选框。之后,度量对象应将过滤器作为参数,并向服务器查询数据 2) 一旦用户更改复选框并因此更新过滤器对象,应用程序应再次将过滤器作为参数,并从服务器获取新的度量数据 我的问题是,我不知道如何使用异步ajax调用处理这两组对象之间的依赖关系。在它的当前状态下,我的应用程序在已经开始加载度量的情况下没有完成加载过滤器。因此,过滤器不会作为度量ajax调用的参数传递 我的问题是:做这个余烬最好的方法是什么?必须有一种方法来处理ajax调用的顺序。我的直觉是,手动添加观察者不是一个好办法 以下是我的应用程序的模型:Ajax 余烬:获取相互依赖的对象的数据,ajax,asynchronous,ember.js,Ajax,Asynchronous,Ember.js,我正在尝试使用Ember为度量工具构建前端。到目前为止,我编写的代码在很大程度上受到了Eviltrout的emberreddit应用程序的影响 目标是有两个相互依赖的类:度量和过滤器 1) 一旦应用程序初始化,过滤器(过滤器类的实例)将从服务器加载。加载过滤器后,它们将在屏幕上显示为复选框。之后,度量对象应将过滤器作为参数,并向服务器查询数据 2) 一旦用户更改复选框并因此更新过滤器对象,应用程序应再次将过滤器作为参数,并从服务器获取新的度量数据 我的问题是,我不知道如何使用异步ajax调用处
//FILTER MODELS
var defaultFilters = ['dates', 'devices'];
//set Filter class. The Filter object will be multiplied for each filter.
App.Filter = Ember.Object.extend({
//capitalize first letter to get title
filterTitle: function() {
return this.get('id').charAt(0).toUpperCase() + this.get('id').slice(1);
}.property('id'),
//set attribute to see if filter has loaded
loadedFilter: false,
//create method to load filter values from server
loadValues: function() {
var filter = this;
return Ember.Deferred.promise(function (p) {
if (filter.get('loadedFilter')) {
p.resolve(filter.get('values'));
} else {
p.resolve($.getJSON("http://127.0.0.1:13373/options/" + filter.get('id')).then(function(response) {
var values = Ember.A();
response[filter.get('id')].forEach(function(value) {
values.push(value);
});
filter.setProperties({values: values, loadedFilter: true});
return values;
}))
}})}
}
);
//reopen class to create "all" method which returns all instances of Filter class
App.Filter.reopenClass({
all: function() {
if (this._all) {return this._all; }
var all = Ember.A();
defaultFilters.forEach(function(id) {
all.pushObject(App.Filter.create({id: id}));
});
this._all = all;
return all;
}});
//Create a Filters array to store all the filters.
App.Filters = App.Filter.all();
//METRIC MODELS
App.Metric = Ember.Object.extend({
metricTitle: function() {
return this.get('id').charAt(0).toUpperCase() + this.get('id').slice(1);
}.property('id'),
loadedMetric: false,
filtersBinding: 'App.Filters',
loadValues: function() {
var metric = this;
var filters = metric.get('filters');
if (filters.get('loadedFilters'))
console.log('loading metrics');
return Ember.Deferred.promise(function (p) {
if (metric.get('loadedMetric')) {
p.resolve(metric.get('values'));
} else {
p.resolve(
console.log('sending ajax'),
$.ajax({
url: "http://127.0.0.1:13373/" + metric.get('id') + "/",
data: JSON.stringify(metric.get('filters')),
}).then(function(response) {
var values = Ember.A();
response[metric.get('id')].forEach(function(value) {
values.push(value);
});
metric.setProperties({"values": values, "loadedMetric": true});
return values;
}))
}})}
});
App.Metric.reopenClass({
findByView: function(searchView) {
if (this._metrics) {return this._metrics; }
var metrics = Ember.A();
defaultMetricsSettings.forEach(function(metric) {
if (metric.view == searchView)
metrics.pushObject(App.Metric.create({id: metric.id},{view: metric.view}, {calculation: metric.calculation}, {format: metric.format}, {width: metric.width}));
});
this._metrics = metrics;
return metrics;
}
});
App.ApplicationRoute = Ember.Route.extend({
//set application routes model to all filters
model: function() {
return App.Filter.all();
},
//after filter has loaded, let's load its values
afterModel: function(model) {
return model.forEach(function(item) {
item.loadValues();
});
},
//create a controller called ApplicationController and pass the filter as its model
setupController: function(controller, filter) {
controller.set('model', filter);
}
});
App.DashboardRoute = Ember.Route.extend({
model: function() {
return App.Metric.findByView('Dashboard');
},
afterModel: function(model) {
return model.forEach(function(item) {
item.loadValues();
});
},
setupController: function(controller, metric) {
controller.set('model', metric);
}
});
App.ApplicationController = Ember.ArrayController.extend({
//ApplicationController controls all the filters. Let's create a controller to handle each instance of a filter
itemController: 'filter'
});
App.FilterController = Ember.ObjectController.extend({
//this sets the titleId property that is used only for binding html attributes in template. Stupid way to do this.
titleId: function() {
return "#" + this.get('filterTitle');}.property('filterTitle')
});
以下是路线:
//FILTER MODELS
var defaultFilters = ['dates', 'devices'];
//set Filter class. The Filter object will be multiplied for each filter.
App.Filter = Ember.Object.extend({
//capitalize first letter to get title
filterTitle: function() {
return this.get('id').charAt(0).toUpperCase() + this.get('id').slice(1);
}.property('id'),
//set attribute to see if filter has loaded
loadedFilter: false,
//create method to load filter values from server
loadValues: function() {
var filter = this;
return Ember.Deferred.promise(function (p) {
if (filter.get('loadedFilter')) {
p.resolve(filter.get('values'));
} else {
p.resolve($.getJSON("http://127.0.0.1:13373/options/" + filter.get('id')).then(function(response) {
var values = Ember.A();
response[filter.get('id')].forEach(function(value) {
values.push(value);
});
filter.setProperties({values: values, loadedFilter: true});
return values;
}))
}})}
}
);
//reopen class to create "all" method which returns all instances of Filter class
App.Filter.reopenClass({
all: function() {
if (this._all) {return this._all; }
var all = Ember.A();
defaultFilters.forEach(function(id) {
all.pushObject(App.Filter.create({id: id}));
});
this._all = all;
return all;
}});
//Create a Filters array to store all the filters.
App.Filters = App.Filter.all();
//METRIC MODELS
App.Metric = Ember.Object.extend({
metricTitle: function() {
return this.get('id').charAt(0).toUpperCase() + this.get('id').slice(1);
}.property('id'),
loadedMetric: false,
filtersBinding: 'App.Filters',
loadValues: function() {
var metric = this;
var filters = metric.get('filters');
if (filters.get('loadedFilters'))
console.log('loading metrics');
return Ember.Deferred.promise(function (p) {
if (metric.get('loadedMetric')) {
p.resolve(metric.get('values'));
} else {
p.resolve(
console.log('sending ajax'),
$.ajax({
url: "http://127.0.0.1:13373/" + metric.get('id') + "/",
data: JSON.stringify(metric.get('filters')),
}).then(function(response) {
var values = Ember.A();
response[metric.get('id')].forEach(function(value) {
values.push(value);
});
metric.setProperties({"values": values, "loadedMetric": true});
return values;
}))
}})}
});
App.Metric.reopenClass({
findByView: function(searchView) {
if (this._metrics) {return this._metrics; }
var metrics = Ember.A();
defaultMetricsSettings.forEach(function(metric) {
if (metric.view == searchView)
metrics.pushObject(App.Metric.create({id: metric.id},{view: metric.view}, {calculation: metric.calculation}, {format: metric.format}, {width: metric.width}));
});
this._metrics = metrics;
return metrics;
}
});
App.ApplicationRoute = Ember.Route.extend({
//set application routes model to all filters
model: function() {
return App.Filter.all();
},
//after filter has loaded, let's load its values
afterModel: function(model) {
return model.forEach(function(item) {
item.loadValues();
});
},
//create a controller called ApplicationController and pass the filter as its model
setupController: function(controller, filter) {
controller.set('model', filter);
}
});
App.DashboardRoute = Ember.Route.extend({
model: function() {
return App.Metric.findByView('Dashboard');
},
afterModel: function(model) {
return model.forEach(function(item) {
item.loadValues();
});
},
setupController: function(controller, metric) {
controller.set('model', metric);
}
});
App.ApplicationController = Ember.ArrayController.extend({
//ApplicationController controls all the filters. Let's create a controller to handle each instance of a filter
itemController: 'filter'
});
App.FilterController = Ember.ObjectController.extend({
//this sets the titleId property that is used only for binding html attributes in template. Stupid way to do this.
titleId: function() {
return "#" + this.get('filterTitle');}.property('filterTitle')
});
控制器:
//FILTER MODELS
var defaultFilters = ['dates', 'devices'];
//set Filter class. The Filter object will be multiplied for each filter.
App.Filter = Ember.Object.extend({
//capitalize first letter to get title
filterTitle: function() {
return this.get('id').charAt(0).toUpperCase() + this.get('id').slice(1);
}.property('id'),
//set attribute to see if filter has loaded
loadedFilter: false,
//create method to load filter values from server
loadValues: function() {
var filter = this;
return Ember.Deferred.promise(function (p) {
if (filter.get('loadedFilter')) {
p.resolve(filter.get('values'));
} else {
p.resolve($.getJSON("http://127.0.0.1:13373/options/" + filter.get('id')).then(function(response) {
var values = Ember.A();
response[filter.get('id')].forEach(function(value) {
values.push(value);
});
filter.setProperties({values: values, loadedFilter: true});
return values;
}))
}})}
}
);
//reopen class to create "all" method which returns all instances of Filter class
App.Filter.reopenClass({
all: function() {
if (this._all) {return this._all; }
var all = Ember.A();
defaultFilters.forEach(function(id) {
all.pushObject(App.Filter.create({id: id}));
});
this._all = all;
return all;
}});
//Create a Filters array to store all the filters.
App.Filters = App.Filter.all();
//METRIC MODELS
App.Metric = Ember.Object.extend({
metricTitle: function() {
return this.get('id').charAt(0).toUpperCase() + this.get('id').slice(1);
}.property('id'),
loadedMetric: false,
filtersBinding: 'App.Filters',
loadValues: function() {
var metric = this;
var filters = metric.get('filters');
if (filters.get('loadedFilters'))
console.log('loading metrics');
return Ember.Deferred.promise(function (p) {
if (metric.get('loadedMetric')) {
p.resolve(metric.get('values'));
} else {
p.resolve(
console.log('sending ajax'),
$.ajax({
url: "http://127.0.0.1:13373/" + metric.get('id') + "/",
data: JSON.stringify(metric.get('filters')),
}).then(function(response) {
var values = Ember.A();
response[metric.get('id')].forEach(function(value) {
values.push(value);
});
metric.setProperties({"values": values, "loadedMetric": true});
return values;
}))
}})}
});
App.Metric.reopenClass({
findByView: function(searchView) {
if (this._metrics) {return this._metrics; }
var metrics = Ember.A();
defaultMetricsSettings.forEach(function(metric) {
if (metric.view == searchView)
metrics.pushObject(App.Metric.create({id: metric.id},{view: metric.view}, {calculation: metric.calculation}, {format: metric.format}, {width: metric.width}));
});
this._metrics = metrics;
return metrics;
}
});
App.ApplicationRoute = Ember.Route.extend({
//set application routes model to all filters
model: function() {
return App.Filter.all();
},
//after filter has loaded, let's load its values
afterModel: function(model) {
return model.forEach(function(item) {
item.loadValues();
});
},
//create a controller called ApplicationController and pass the filter as its model
setupController: function(controller, filter) {
controller.set('model', filter);
}
});
App.DashboardRoute = Ember.Route.extend({
model: function() {
return App.Metric.findByView('Dashboard');
},
afterModel: function(model) {
return model.forEach(function(item) {
item.loadValues();
});
},
setupController: function(controller, metric) {
controller.set('model', metric);
}
});
App.ApplicationController = Ember.ArrayController.extend({
//ApplicationController controls all the filters. Let's create a controller to handle each instance of a filter
itemController: 'filter'
});
App.FilterController = Ember.ObjectController.extend({
//this sets the titleId property that is used only for binding html attributes in template. Stupid way to do this.
titleId: function() {
return "#" + this.get('filterTitle');}.property('filterTitle')
});
您的
afterModel
hook可以通过一系列依赖的承诺来实现这一点。当前实现将立即返回,而您将链接承诺并最终返回最后一个承诺作为钩子的结果。路由器将等待整套呼叫完成,然后继续setupController
afterModel: function(model) {
var promise;
model.forEach(function(item)) {
if (promise) {
promise = promise.then(function() {
item.loadValues();
});
} else {
promise = item.loadValues();
}
}
return promise;
}
我不确定您有多少个电话,但您可能希望将其中一些电话批处理在一起,以减少HTTP请求的数量。谢谢Darshan!成功了!您关于批处理调用的建议很好,我想我会在初始页面加载时实现它。但是,我想保持单独调用的可能性,以允许在不必一次获取所有数据的情况下更改单个元素。
承诺
非常棒。:)