Javascript 无法使用Ember API工具包更改模型数据
几周来,我一直在努力学习Ember的基本原理,当涉及到通过控制器中的操作更改模型中的数据时,我目前遇到了一个问题 我发现的所有示例似乎都使用一维夹具。我使用的固定装置如下所示:Javascript 无法使用Ember API工具包更改模型数据,javascript,ember.js,frameworks,ember-app-kit,Javascript,Ember.js,Frameworks,Ember App Kit,几周来,我一直在努力学习Ember的基本原理,当涉及到通过控制器中的操作更改模型中的数据时,我目前遇到了一个问题 我发现的所有示例似乎都使用一维夹具。我使用的固定装置如下所示: App.ClassGroup = DS.Model.extend({ className: DS.attr('string'), isActive: DS.attr('number'), students: DS.hasMany('Students',{async:true}), sele
App.ClassGroup = DS.Model.extend({
className: DS.attr('string'),
isActive: DS.attr('number'),
students: DS.hasMany('Students',{async:true}),
selected: DS.hasMany('Students',{async:true})
});
App.ClassGroup.FIXTURES = [
{
id: 123,
className: 'Class 1',
isActive: 1,
students: [11, 22, 33, 44, 55],
selected: [11, 22, 33, 44, 55]
},
{
id: 456,
className: 'Class 2',
isActive: 0,
students: [66, 77, 88, 99],
selected: [66, 88, 99]
},
{
id: 789,
className: 'Group 1',
isActive: 0,
students: [77, 22],
selected: []
}
];
App.Students = DS.Model.extend({
first: DS.attr('string'),
last: DS.attr('string'),
classes: DS.hasMany('ClassGroup')
});
App.Students.FIXTURES = [
{
id: 11,
first: 'Student',
last: 'One',
classes: [123]
},
{
id: 22,
first: 'Student',
last: 'Two',
classes: [123, 789]
},
{
id: 33,
first: 'Student',
last: 'Three',
classes: [123]
},
{
id: 44,
first: 'Student',
last: 'Four',
classes: [123]
},
{
id: 55,
first: 'Student',
last: 'Five',
classes: [123]
},
{
id: 66,
first: 'Student',
last: 'Six',
classes: [456]
},
{
id: 77,
first: 'Student',
last: 'Seven',
classes: [456, 789]
},
{
id: 88,
first: 'Student',
last: 'Eight',
classes: [456]
},
{
id: 99,
first: 'Student',
last: 'Nine',
classes: [456]
}
];
var IndexController = Ember.ArrayController.extend({
actions: {
isActiveTog: function(id){
console.log(this);
console.log(this.store.get('model'));
var getter = this.get('classgroup');
console.log(getter);
}
},
classCount: function(){
return this.get('length');
}.property('@each')
});
export default IndexController;
我的控制器如下所示:
App.ClassGroup = DS.Model.extend({
className: DS.attr('string'),
isActive: DS.attr('number'),
students: DS.hasMany('Students',{async:true}),
selected: DS.hasMany('Students',{async:true})
});
App.ClassGroup.FIXTURES = [
{
id: 123,
className: 'Class 1',
isActive: 1,
students: [11, 22, 33, 44, 55],
selected: [11, 22, 33, 44, 55]
},
{
id: 456,
className: 'Class 2',
isActive: 0,
students: [66, 77, 88, 99],
selected: [66, 88, 99]
},
{
id: 789,
className: 'Group 1',
isActive: 0,
students: [77, 22],
selected: []
}
];
App.Students = DS.Model.extend({
first: DS.attr('string'),
last: DS.attr('string'),
classes: DS.hasMany('ClassGroup')
});
App.Students.FIXTURES = [
{
id: 11,
first: 'Student',
last: 'One',
classes: [123]
},
{
id: 22,
first: 'Student',
last: 'Two',
classes: [123, 789]
},
{
id: 33,
first: 'Student',
last: 'Three',
classes: [123]
},
{
id: 44,
first: 'Student',
last: 'Four',
classes: [123]
},
{
id: 55,
first: 'Student',
last: 'Five',
classes: [123]
},
{
id: 66,
first: 'Student',
last: 'Six',
classes: [456]
},
{
id: 77,
first: 'Student',
last: 'Seven',
classes: [456, 789]
},
{
id: 88,
first: 'Student',
last: 'Eight',
classes: [456]
},
{
id: 99,
first: 'Student',
last: 'Nine',
classes: [456]
}
];
var IndexController = Ember.ArrayController.extend({
actions: {
isActiveTog: function(id){
console.log(this);
console.log(this.store.get('model'));
var getter = this.get('classgroup');
console.log(getter);
}
},
classCount: function(){
return this.get('length');
}.property('@each')
});
export default IndexController;
这是我们的路由器:
import Students from "appkit/models/students";
import ClassGroup from "appkit/models/classgroup";
export default Ember.Route.extend({
model: function() {
return this.store.find('classgroup');
},
setupController: function(controller, model){
this._super(controller, model);
controller.set('students', this.store.find('students'));
controller.set('classgroup', this.store.find('classgroup'));
}
});
以下是我们的把手模板中的每个块(我删除了其余部分,因为它太大了):
{{#每个类组}
{{取消绑定this.className}
{{{#视图'切换类'}{{/view}}
{{{每个学生}
-
{{解除绑定this.last},{{解除绑定this.first}
{{/每个}}
我尽可能多地包含了我们的代码,因为我对Ember还是很陌生,我想确保您拥有帮助回答这个问题所需的所有信息,即使这意味着给了您太多
为了避免你挖得太多,这里有更多的信息。在把手模板中,有一行{action“isActiveTog”this.id on=“click”}在我们的范围内
这将在我们的控制器中调用一个函数,isActiveTog
,我们希望使用该函数在模型中为在每个
循环中单击的任何“classgroup”记录切换isActive
的值
例如,用户单击“Class 1”,它有一个对isActiveTog
的操作调用,传入ID=123。我希望我在控制器中的操作将ClassGroup[123][isActive]的值从0切换到1,反之亦然
我可以说我的控制器被正确调用了,因为我能够将{{classCount}}
放入我的模板中,并在输出中看到一个“3”。因此,问题是我无法找到在控制器中切换值的方法
如何使用this.store.find()
搜索ID等于传递给操作的任何内容的classgroup
行,然后访问该类记录的isActive值。然后我需要使用this.store.set()
写回模型。您似乎来自jQuery背景,因为您试图通过模板将类组记录的id
嵌入DOM(当然,这没什么错,因为当我第一次开始使用来自jQuery的Ember时,我就是这么做的)。如果你注意到自己这样做了,你可能是在以非Ember的方式做一些事情。通常,如果你需要集成一些第三方jQuery库,你应该只通过ID访问DOM元素
好了,现在你知道该注意什么了,我们应该如何以余烬的方式实现你想要的
可能有几种方法可以实现这一点,但对我来说,有效的方法是为扩展ObjectController而不是ArrayController的每个类组创建另一个控制器
ClassGroupsController(ArrayController)->ClassGroupController(ObjectController)
请注意,数组控制器是多元的。这允许您管理每个类组记录的状态,因为每个类组记录现在都有自己的控制器和视图
因此,首先创建一个数组控制器来管理类组集合:
App.ClassGroupsController = Ember.ArrayController.extend({
});
然后,ClassGroupController(对象)应该有一个侦听单击事件的视图。当我们得到一个单击事件时,我们会在控制器(ClassGroupController)上触发一个名为selected
的操作
App.ClassGroupView = Ember.View.extend({
templateName: 'classGroup',
/*
By specifying the tagName for this view we are telling ember
we want to wrap the view in a <tr> element. This is because
each classGroup is going to be a row in our table. By default
each view is wrapped in a <div>
*/
tagName: 'tr',
/*
This is the click handler that is called whenever the user
clicks on this view (in this case one of our <tr> elements
that is displaying our ClassGroup Model for us. The event
parameter is the jQuery event object.
*/
click: function(event){
/*
We want to forward this event to the controller where
we can do some logic based on the fact that it was clicked.
*/
this.get('controller').send('selected');
}
});
现在我们需要在模板中连接这个
{{#each itemController="classGroup"}}
{{view App.ClassGroupView}}
{{/each}}
请注意,我是如何指定要将类组用作ArrayController的itemController的。在这里,我直接在模板中指定它。您也可以使用itemController
属性在ArrayController本身中指定它。例如:
App.ClassGroupsController = Ember.ArrayController.extend({
itemController: 'classGroup'
});
下面是一个正在工作的JSFIDLE,使用您的装置演示整个概念:
您似乎来自jQuery背景,因为您试图通过模板将类组记录的id
嵌入到DOM中(当然这没什么错,因为这是我第一次从jQuery背景开始使用Ember时所做的)。如果您注意到自己在这样做,则可能是在以非余烬的方式进行操作。通常,如果需要集成某些第三方jQuery库,则只应通过ID访问DOM元素
好了,现在你知道该注意什么了,我们应该如何以余烬的方式实现你想要的
可能有几种方法可以实现这一点,但对我来说,有效的方法是为扩展ObjectController而不是ArrayController的每个类组创建另一个控制器
ClassGroupsController(ArrayController)->ClassGroupController(ObjectController)
请注意,数组控制器是多元的。这允许您管理每个类组记录的状态,因为每个类组记录现在都有自己的控制器和视图
因此,首先创建一个数组控制器来管理类组集合:
App.ClassGroupsController = Ember.ArrayController.extend({
});
然后,ClassGroupController(对象)应该有一个侦听单击事件的视图。当我们得到一个单击事件时,我们会在控制器(ClassGroupController)上触发一个名为selected
的操作
App.ClassGroupView = Ember.View.extend({
templateName: 'classGroup',
/*
By specifying the tagName for this view we are telling ember
we want to wrap the view in a <tr> element. This is because
each classGroup is going to be a row in our table. By default
each view is wrapped in a <div>
*/
tagName: 'tr',
/*
This is the click handler that is called whenever the user
clicks on this view (in this case one of our <tr> elements
that is displaying our ClassGroup Model for us. The event
parameter is the jQuery event object.
*/
click: function(event){
/*
We want to forward this event to the controller where
we can do some logic based on the fact that it was clicked.
*/
this.get('controller').send('selected');
}
});
现在我们需要在模板中连接这个
{{#each itemController="classGroup"}}
{{view App.ClassGroupView}}
{{/each}}
注意如何