这是我在events.js
中指定的两个模板的事件侦听器// event listeners on the addSiteForm template
Template.addCommentForm.events({
// this runs when they click the add button... you need to compete it
'click .js-add-comment':function(event){
var comment_text = $('#comment_input').val();// get the form value using jquery...
var user = 'anonymous person';
// the 'this' variable contains
// the data that this template is displaying
// which is the Website item
var site = this;
if (Meteor.user()){
user = Meteor.user().emails[0].address
}
var comment = {"text":comment_text,
"siteId":site._id,
"createdOn":new Date(),
"createdBy":user};// create a simple object to insert to the collectoin
Comments.insert(comment);
console.log("events start");
console.log("totla coomets are "+Comments.find({}).count()+"\n");
console.log("commenst in site "+Comments.find({siteId:site._id}).count()+"\n");
console.log("site id is "+site._id);
console.log("events end");
return false;
}
});
// event listeners on the addSiteForm template
Template.addSiteForm.events({
// this runs when they click the add button... you need to compete it
'click .js-add-site':function(event){
var url = $('#url_input').val();// get the form value using jquery...
var user = 'anonymous person';
if (Meteor.user()){
user = Meteor.user().emails[0].address
}
var site = {"url":url,
"createdOn":new Date(),
"createdBy":user};// create a simple object to insert to the collectoin
Websites.insert(site);
return false;
}
});
路由器功能在router.js
中指定Router.configure({
layoutTemplate: 'ApplicationLayout'
});
// the main route. showing the list of sites.
Router.route('/', function () {
this.render('siteList');
});
// this route is for the discussion page for a site
Router.route('/discussSite/:_id', function () {
var siteId = this.params._id;
site = Websites.findOne({_id:siteId});
this.render('discussSite', {data:site});
});
main.js包含集合 //共享代码
Websites = new Mongo.Collection("websites");
Comments = new Mongo.Collection("comments");
助手是
// this helper gets the data from the collection for the site-list Template
Template.siteList.helpers({
'all_websites':function(){
return Websites.find({});
},
'safer_email':function(email){
if (email.indexOf('@')!=-1){// we have an email
return email.split('@')[0];
}
else{// probably anonymouse.
return email;
}
}
});
Template.discussSite.helpers({
'comments':function(siteId){
//console.log("helper comments "+this.site);
// complete the code here so that it reruns
console.log(this.params.site._id);
return Comments.find({siteId:siteId});
// all the comments with a siteId equal to siteId.
}
});
html文件位于main.html.here它首先显示网页中可用的网站。点击此按钮，用户将被路由到新页面。用户可以为网站添加评论
<head>
<title>week_4_peer_assessment</title>
</head>
<body>
</body>
<!-- this is the template that iron:router renders every time -->
<template name="ApplicationLayout">
<div class="container">
<a href="/">Home</a>
{{>loginButtons}}
<h1>SiteAce - discuss your favourite websites</h1>
<!-- iron router will select what to render in place of yield-->
{{> yield }}
</div>
</template>
<template name="discussSite">
<h3>Discussing: {{url}} </h3>
{{> addCommentForm}}
<!-- write some code here that iterates through the comments and displays
the comment text and the author -->
<!-- clue - you have already written the 'comments' helper function -->
<ul>
{{#each comments}}
<li>{{text}} (added by {{safer_email createdBy}})
</li>
{{/each}}
</ul>
</template>
<template name="addCommentForm">
<div class="row">
<div class="col-lg-6">
<div class="input-group">
<input type="text" id="comment_input" class="form-control" placeholder="Enter your comment">
<input type="hidden" id="site_id" class="form-control" placeholder="Enter your comment">
<span class="input-group-btn">
<button class="btn btn-default js-add-comment" type="submit">Add!</button>
</span>
</div><!-- /input-group -->
</div><!-- /.col-lg-6 -->
</div>
</template>
<template name="siteList">
Fill in the form and click submit to add a site:
{{>addSiteForm}}
<h3>Sites you have added:</h3>
<ul>
{{#each all_websites}}
<li>{{url}} (added by {{safer_email createdBy}})
<br/><a href="/discussSite/{{_id}}">discuss</a>
<br/><a href="{{url}}">visit site</a>
</li>
{{/each}}
</ul>
</template>
<template name="addSiteForm">
<div class="row">
<div class="col-lg-6">
<div class="input-group">
<input type="text" id="url_input" class="form-control" placeholder="Enter website URL...">
<span class="input-group-btn">
<button class="btn btn-default js-add-site" type="submit">Add!</button>
</span>
</div><!-- /input-group -->
</div><!-- /.col-lg-6 -->
</div>
</template>
starup.js包含服务器运行的启动代码
Meteor.startup(function(){
if (!Websites.findOne()){// nothing in the database yet
var site = {"url":"http://www.google.com",
"createdOn":new Date(),
"createdBy":"Michael"};// create a simple object to insert to the collectoin
Websites.insert(site);
site = {"url":"http://www.yeeking.net",
"createdOn":new Date(),
"createdBy":"Janet"};// create a simple object to insert to the collectoin
Websites.insert(site);
site = {"url":"http://www.coursera.org",
"createdOn":new Date(),
"createdBy":"Jose"};// create a simple object to insert to the collectoin
Websites.insert(site);
}
});
答案 0 :(得分：0)
这就是你的模板应该是:(我删除了safer_email。这是错误的。不确定这是否是你正在做的其他事情。）
<template name="discussSite">
<h3>Discussing: {{url}} </h3>
{{> addCommentForm}}
<!-- write some code here that iterates through the comments and displays
the comment text and the author -->
<!-- clue - you have already written the 'comments' helper function -->
<ul>
{{#each comments}}
<li>{{text}} (added by {{createdBy}})</li>
{{/each}}
</ul>
</template>
<强>助手：
this._id或Router.current().params._id会为您提供您正在寻找的siteId。由于this.site._id无效，您曾使用this.site错误输出。您可以通过执行this进一步查看console.log(this)对象包含的内容。这可以帮助你更快地解决这个问题。'comments':function(){
console.log("site id in helper is ",this._id); // or Router.current().params._id;
console.log(Comments.find({siteId:this._id}).fetch());
return Comments.find({siteId:this._id});
}