嘿,我在我的 ember 应用程序中遇到了两个不同的问题,这两个问题都涉及绑定。
首先,当我不想要它时,我有一个绑定触发。基本上我想要实现的(我正在构建一个调查创建者前端应用程序)是,当任何文本输入到问题的“名称”字段中时,我想添加一个新的问题对象,它将呈现在用户正在添加的问题列表的末尾输出另一个空白问题。这具有总是有一个新问题的效果,因此不需要添加问题按钮。绑定正在工作,并且正在添加一个新对象:但是,由于绑定来自最新的问题对象,因此在创建新对象时再次触发绑定,这反过来又创建了一个新对象,从而再次触发绑定....这显然最终导致浏览器崩溃。我试过使用 Ember._suspendObserver 函数,但没有 有很多关于此的文档,我认为我用错了 - 无论如何它并没有暂停观察者或暂停绑定。代码中的观察者在第 27 行左右(contentsNameObserver)
我遇到的另一个问题 - 我有一个选择下拉框,可以选择用户想要的问题类型(单选、多选等),但是选择框和 {{#each} 之间的绑定呈现这种问题的助手没有触发。我正在使用 Ember.Select 视图助手,因此使用 get/set 触发绑定应该没有任何问题。我正在使用计算属性根据问题类型 id 的值返回问题类型的字段数组。计算的属性在第 13 行 (App.SurveyContent.types) 和模板 templates/step3。快速提醒您,此应用程序可能会扩展到调查之外,因此“问题”在代码中通常称为“内容”。
我对 ember 很陌生(这是我的第一个真正的应用程序),所以我的代码很可能在这些问题之外还有很多问题......所以任何关于我如何构建我的应用程序的评论也将不胜感激!
Javascript ember 应用程序:
App = Ember.Application.create({
rootElement: '#emberContainer'
});
App.SurveyContent = Ember.Object.extend({
name: "",
content_type: 1,
content_pos: 1,
hash: Em.A([]),
types: function() {
alert("redraw");
return App.ContentTypes[this.content_type-1].hash;
}.property()
});
App.Surveys = Ember.Object.create({
name: null,
start: $.datepicker.formatDate('mm/dd/yy' , new Date()),
end: $.datepicker.formatDate('mm/dd/yy' , new Date()),
themeID: 0,
contents: [App.SurveyContent.create()], //Pushing an instance of App.SurveyContent onto this
contentsNameObserver: function() {
context = this;
console.log("entering");
Em._suspendObserver(App.Surveys, "contents.lastObject.name", false, false, function() {
console.log("suspend handler");
context.contents.pushObject(App.SurveyContent.create());
})
}.observes("contents.lastObject.name")
});
App.ContentTypes = [
Ember.Object.create({name: 'Text question', id:1, hash: [Ember.Object.create({name: 'Question', help: 'Enter the question here', type: 'text'})]}),
Ember.Object.create({name: 'Multichoice question', id:2, hash: [Ember.Object.create({name: 'Question', help: 'Enter the question here', type: 'text'}),
Ember.Object.create({name: 'Answer', help: 'Enter possible answers here', type: 'text', multiple: true})]})
];
App.ViewTypeConvention = Ember.Mixin.create({
viewType: function() {
console.log(this);
return Em.get("Ember.TextField");
}.property().cacheable()
});
App.CRMData = Ember.Object.extend();
App.CRMData.reopenClass ({
crm_data: [],
org_data: [],
org_display_data: [],
loadData: function() {
context = this;
context.crm_data = [];
$.getJSON ("ajax/crm_data", function(data) {
data.forEach(function(crm) {
context.crm_data.pushObject(App.CRMData.create({id: crm.crm_id, name: crm.crm_name}));
crm.orgs.forEach(function(org) {
context.org_data.pushObject(App.CRMData.create({id: org.org_id, name: org.org_name, crm_id: crm.crm_id}));
}, context)
}, context)
context.updateOrganisations(5);
});
return this.crm_data;
},
updateOrganisations: function(crm_id) {
context = this;
this.org_display_data.clear();
console.log("clearing the buffer")
console.log(this.org_display_data)
context.org_data.forEach(function(org) {
if(org.crm_id == crm_id) {
context.org_display_data.pushObject(App.CRMData.create({id: org.id, name: org.name}));
}
}, context)
}
});
App.DateField = Ember.TextField.extend({
attributeBindings: ['id', 'class']
});
App.CRMSelect = Ember.Select.extend({
attributeBindings: ['id'],
change: function(evt) {
console.log(evt)
App.CRMData.updateOrganisations($('#crm').val())
}
});
App.ApplicationController = Ember.Controller.extend();
App.Step1Controller = Ember.ArrayController.extend({});
App.Step2Controller = Ember.ArrayController.extend({});
App.Step2Controller = Ember.ArrayController.extend({});
App.ApplicationView = Ember.View.extend({
templateName: 'app'
});
App.Step0View = Ember.View.extend ({
templateName: 'templates/step0'
});
App.Step1View = Ember.View.extend ({
templateName: 'templates/step1'
});
App.Step2View = Ember.View.extend ({
templateName: 'templates/step2',
didInsertElement: function() {
$( ".jquery-ui-datepicker" ).datepicker();
}
});
App.Step3View = Ember.View.extend ({
templateName: 'templates/step3',
});
App.Router = Em.Router.extend ({
enableLogging: true,
root: Em.Route.extend ({
showstep1: Ember.Route.transitionTo('step1'),
showstep2: Ember.Route.transitionTo('step2'),
showstep3: Ember.Route.transitionTo('step3'),
index: Ember.Route.extend({
route: '/',
connectOutlets: function(router){
router.get('applicationController').connectOutlet( 'step0');
}
}),
step1: Ember.Route.extend ({
route: 'step1',
connectOutlets: function(router){
router.get('applicationController').connectOutlet( 'step1', App.CRMData.loadData());
}
}),
step2: Ember.Route.extend ({
route: 'step2',
connectOutlets: function(router) {
router.get('applicationController').connectOutlet('step2')
},
}),
step3: Ember.Route.extend ({
route: 'step3',
connectOutlets: function(router) {
router.get('applicationController').connectOutlet('step3')
},
})
})
});
Ember.LOG_BINDINGS=true;
App.LOG_BINDINGS = true;
App.ContentTypes.forEach(function(object) {
object.hash.forEach(function(hash) {
hash.reopen(App.ViewTypeConvention);
}, this);
}, this);
Html 模板(我在 haml 中有这些模板,所以这只是重要模板的代表)
<script type="text/x-handlebars" data-template-name="app">
{{outlet}}
</script>
<script type="text/x-handlebars" data-template-name="templates/step3">
<h1> Add content to {{App.Surveys.name}} </h1>
<br>
<div id = "accordion2" class = "accordion">
{{#each content in App.Surveys.contents}}
<div class="accordion-group">
<div class = "accordion-heading">
<a class = "accordion-toggle" data-parent = "#accordion2" data-toggle = "collapse" href = "#collapseOne">
{{content.name}}
</a>
</div>
<div id = "collapseOne" class = "accordion-body collapse in">
{{view Ember.TextField valueBinding="content.name" class="txtName"}}
<form class = "form-horizontal">
<div class = "accordion-inner">
<div class = "control-group">
<label class = "control-label" for ="organisation">
Content Type
<div class = "controls">
{{view Ember.Select contentBinding="App.ContentTypes" optionValuePath="content.id" optionLabelPath="content.name" valueBinding="content.content_type"}}
</div>
</div>
</div>
{{#each item in content.types }}
<div class = "control-group" >
<label class = "control-label" for = "organisation">
{{item.name}}
<div class = "controls">
{{view item.viewType }}
</div>
{{/each}}
</div>
</form>
</div>
{{/each}}
</div>
</div>
<br>
<div class = "btn" {:_action => 'showstep3'}> Next Step > </div>
</script>