Develop Reference

vue.js - Is there any way to render elements in two different divs using one v-for loop?

The goal is to make the output look like this:
<div id="tabs">
<div id="first">
<a>tab 1</a>
<a>tab 2</a>
</div>
<div id="second">
<a>tab 3</a>
</div>
</div>
Currently I'm using this solution (using two v-for loops):
tabs.js (current)
export default {
data() {
return {
tabs: {
first: [{ name: 'tab1' }, { name: 'tab2' }],
second: [{ name: 'tab3' }],
}
}
}
template: `
<div id="tabs">
<div id="first">
<a v-for="tab in tabs.first">{{ tab.name }}</a>
</div>
<div id="second">
<a v-for="tab in tabs.second">{{ tab.name }}</a>
</div>
</div>
`
}
I had an idea to do something like this but it performs more iterations than in the case with two loops:
tabs.js (idea)
export default {
data() {
return {
tabs: {
test: [
{ name: 'tab1', category: 'first' },
{ name: 'tab2', category: 'first' },
{ name: 'tab3', category: 'second' }
]
}
}
}
template: `
<div id="tabs">
<div v-for='category in ["first", "second"]' :id='category' :key='category'>
<template v-for="tab in tabs.test">
<a v-if="tab.category === category">{{ tab.name }}</a>
</template>
</div>
</div>
`
}
I read this topic but it contains slightly different solutions, which unfortunately didn't work in this case.

There's no problem using more than one v-for loops. And there's no problem using nested v-for loops.
The problem I see with your current code is that it's not scalable. You're hard-coding the exact values of your tabs in <template />(e.g: first, second).
The main idea here is to loop through tabs and, inside each tab, to loop through each contents, without the <template> needing to know what the tab is or how many there are.
So that when you change your tabs to, say...
{
tab1: [{ name: 'intro'}],
tab2: [{ name: 'tab2-1' }, { name: 'tab2-2' }],
tab3: [{ name: 'tab3' }]
}
template still works, without needing any change.
To achieve this type of flexibility, you need to use a nested v-for loop:
<div id="tabs">
<div v-for="(items, name) in tabs" :key="name" :id="name">
<a v-for="(item, key) in items" :key="key" v-text="item.name"></a>
</div>
</div>
Demo:
new Vue({
el: '#app',
data: () => ({
tabs: {
tab1: [{
name: 'intro'
}],
tab2: [{
name: 'tab2-1'
}, {
name: 'tab2-2'
}],
tab3: [{
name: 'tab3'
}]
}
})
})
#tabs a { padding: 3px 7px }
<script src="https://v2.vuejs.org/js/vue.min.js"></script>
<div id="app">
<div id="tabs">
<div v-for="(links, name) in tabs" :key="name" :id="name">
<a v-for="(link, key) in links"
:key="key"
:href="`#${link.name}`"
v-text="link.name"></a>
</div>
</div>
</div>
But I'd take it one step further and change the tabs to be an array:
data: () => ({
tabs: [
[{ name: 'intro'}],
[{ name: 'tab1' }, { name: 'tab2' }],
[{ name: 'tab3' }]
]
})
And use :id="'tab-' + name" on tab divs if you really need those unique ids. (Hint: you don't).
It makes more sense to me.

I did not see any harm in using two v-for (one for the object keys and another for the array elements) as far as it is all dynamic. You can give a try to this solution by using of Object.keys() :
new Vue({
el: '#app',
data: {
tabs: {
first: [{ name: 'tab1' }, { name: 'tab2' }],
second: [{ name: 'tab3' }],
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div id="tabs">
<div v-for="tab in Object.keys(tabs)" :key="tab" :id="tab">
<a v-for="tab in tabs[tab]">{{ tab.name }}</a>
</div>
</div>
</div>

You could add a computed property being the .concat from both and loop for it
export default {
data() {
tabs: {
first: [{ name: 'tab1' }, { name: 'tab2' }],
second: [{ name: 'tab3' }],
}
},
computed: {
tabsCombined () {
return this.tabs.first.concat(this.tabs.second)
}
},
template: `
<div id="tabs">
<div v-for='category in tabsCombined' :id='category' :key='category'>
<template v-for="tab in tabs.test">
<a v-if='tab.category === category>{{ tab.name }}</a>
</template>
</div>
</div>
`
}

V-model error in components (VueJS)

i'm new on VueJS and i'm making a chat following a tutorial.
in the tutorial, the professor puts a v-model in a component. When I do this, the component is not "rendered" on the screen, and the console responds to "text is not defined," I can not find this problem anywhere, if someone can help me, I'll be grateful, follow my html and js.
HTML
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Chat JS</title>
<link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.min.css">
<link rel="stylesheet" href="css/app.css">
</head>
<body>
<div class="container">
<div class="row">
<div id="app">
<router-link to="/chat">Vá para o Chat</router-link><br>
<router-link to="/rooms">Vá para as Salas</router-link><br><br><br>
<router-view></router-view>
</div>
</div>
</div>
<script src="https://www.gstatic.com/firebasejs/3.5.2/firebase.js"></script>
<script type="text/javascript" src="node_modules/jquery/dist/jquery.min.js"></script>
<script type="text/javascript" src="node_modules/bootstrap/dist/js/bootstrap.min.js"></script>
<script type="text/javascript" src="node_modules/vue/dist/vue.min.js"></script>
<script type="text/javascript" src="node_modules/vue-router/dist/vue-router.min.js"></script>
<script type="text/javascript" src="node_modules/vuefire/dist/vuefire.min.js"></script>
<script type="text/javascript" src="app/app.js"></script>
</body>
</html>
JS
var firebaseApp = firebase.initializeApp(config);
var db = firebaseApp.database();
const chatComponent = {
template: `
<div class="panel panel-primary">
<div class="panel-heading">Chat</div>
<div class="panel-body" style="height: 400px; overflow-y: scroll;">
<ul class="chat list-unstyled">
<li class="clearfix"
v-bind:class="{left: !isUser(o.email), right: isUser(o.email)}" v-for="o in chat.messages">
<span v-bind:class="{'pull-left': !isUser(o.email), 'pull-right': isUser(o.email)}">
<img v-bind:src="o.photo" class="img-circle"/>
</span>
<div class="chat-body">
<strong>{{o.name}}</strong>
<p>
{{ o.text }}
</p>
</div>
</li>
</ul>
</div>
<div class="panel-footer">
<div class="input-group">
<input type="text" class="form-control input-md" placeholder="Digite sua Mensagem..."/>
<span class="input-group-btn">
<button class="btn btn-sucess btn-md">Enviar</button>
</span>
</div>
</div>
</div>
`,
data: function() {
return {
user: {
email: 'jose#gmail.com',
name: 'Jose Joao',
},
chat: {
messages: [
{
email: "fulano#gmail.com",
text: "Olá eu sou o Fulano",
name: "Fulano",
photo: "http://placehold.it/50/000FFF/fff&text=00"
},
{
email: "jose#gmail.com",
text: "Estou Joia, eu sou o Robo",
name: "Robo",
photo: "http://placehold.it/50/FFFFFF/fff&text=EU"
},
{
email: "jose#gmail.com",
text: "Tudo bem com voce",
name: "Robo",
photo: "http://placehold.it/50/FFFFFF/fff&text=EU"
}
]
}
};
},
methods:{
isUser:function(email){
return this.user.email == email;
}
}
};
const RoomsComponent = {
template:`
<div class="col-md-12" >
<div class="col-md-4" v-for="o in rooms">
<div class="panel panel-primary">
<div class="panel-heading">
{{ o.name }}
</div>
<div class="panel-body">
{{o.description}}<br>
Entrar
</div>
</div>
</div>
<div class="col-md-4">
<input type="text" id="problem"/>
<ul>
</ul>
</div>
</div>
`,
firebase:{
array: db.ref('array')
},
data: function() {
return {
rooms: [
{id: "001", name: "Duvidas", description: "Duvidas Gerais"},
{id: "002",name: "Cadastros/Login", description: "Duvidas sobre Acesso"},
{id: "003",name: "Planos", description: "Duvidas sobre os Planos"},
{id: "004",name: "Creditos", description: "Duvidas sobre os Creditos"},
{id: "005",name: "Modelos", description: "Duvidas sobre os Modelos"},
{id: "006",name: "Envios", description: "Duvidas sobre os Envios"}
]
};
},
methods:{
goToChat: function(room){
router.push('/chat/'+room.id)
},
insertData: function(){
this.$firebaseRefs.array.push({
text: this.text
});
}
}
};
const routes =[
{ path: '/chat/:room', component: chatComponent },
{ path: '/rooms', component: RoomsComponent }
]
const router = new VueRouter({
routes
})
const app = new Vue({
router
}).$mount('#app')
Recalling that the problem is in the input with id "problem" (to facilitate you) Basically as I said, just to put a V-model it of the error, if anyone knows, thank you!

You need to define your components as follows:
Vue.component('chat-component', {
template: `...`,
data: {
// your data
},
methods: {
// your methods
},
// and so on
});
You have only created javascript objects, not Vue components, in your sample code above.
You can also check the jsFiddle examples from previous questions on vue.js in stackoverflow, which will guide you on the syntax for creating Vue components, parent-child communication, etc.

Vue.js v-show in a list

I'm sure this one's gonna be extremely easy for you guys. I am trying to make a simple list of posts with the post titles always visible, and when you click a specific post in the list, you get the post's body. I used v-show for that. However, when I click a specific post, the bodies of all of the posts appear, instead of just the one that I clicked.
Here's the template:
<template>
<div class="container">
<h1>My Posts</h1>
<ul class="list-group">
<li class="list-group-item" v-for="post in list">
<div #click="changeShow">
<h4>{{ post.title }}</h4>
<p v-show="show">{{ post.body }}</p>
<span v-show="show" class="label label-primary">ID: {{ post.userId }}</span>
</div>
</li>
</ul>
</div>
And the logic:
<script>
export default{
data(){
return{
msg:'hello vue',
list: [],
show: false
}
},
ready(){
this.fetchPostList();
},
methods:{
fetchPostList: function () {
var root = 'http://jsonplaceholder.typicode.com';
this.$http.get(root + '/posts').then(function (response) {
this.list = response.data;
})
},
changeShow: function () {
this.show = !this.show;
}
}
}

There's a few ways to approach this depending on your needs.
Multiple Open
You can make each post it's own component, that way you can have show be tied to each individual post instead of all of them.
Vue.component('post', {
template: '#post-template',
props: {
post: Object,
},
data() {
return {
show: false,
}
},
methods: {
toggleShow() {
this.show = !this.show
},
},
})
Then you can have use it like this:
<post v-for="post in posts" :post="post"></post>
One Open
If you just want one open you can pass an id as a prop and show it based on that.
Vue.component('post', {
template: '#post-template',
props: {
post: Object,
selectedId: Number,
},
computed: {
show() {
return this.post.id === this.selectedId
},
},
})
Then you can do like
<post :selected-id="selectedId" :post="post" #click="selectedId = post.id"></post>

I cheated in a different way. Just added a show property to each post and toggled that.
new Vue({
el: 'body',
data: {
list: []
},
ready: function() {
this.fetchPostList()
},
methods: {
fetchPostList: function() {
setTimeout(function() {
this.list.push({
title: 'First Post',
body: 'This is the first Post',
userId: 'Joe',
show: false
});
this.list.push({
title: 'Second Post',
body: 'This is the second Post',
userId: 'Joe',
show: false
});
this.list.push({
title: 'Third Post',
body: 'This is the third Post',
userId: 'Joe',
show: false
});
}.bind(this), 2000);
},
changeShow: function(idx) {
this.list[idx].show = !this.list[idx].show;
}
}
});
<link href="//cdnjs.cloudflare.com/ajax/libs/skeleton/2.0.4/skeleton.min.css" rel="stylesheet" />
<script src="//cdnjs.cloudflare.com/ajax/libs/vue/1.0.26/vue.min.js"></script>
<div class="container">
<h1>My Posts</h1>
<ul class="list-group">
<li class="list-group-item" v-for="post in list">
<div #click="changeShow($index)">
<h4>{{ post.title }}</h4>
<p v-show="post.show">{{ post.body }}</p>
<span v-show="post.show" class="label label-primary">ID: {{ post.userId }}</span>
</div>
</li>
</ul>
</div>

First of all, the method that I will give an example is not useful, but I am writing to show that there is such a way.
for example
<script>
export default {
data: {
isShow: false,
postUserId: null,
},
};
</script>
<template>
<div class="container">
<h1>My Posts</h1>
<ul class="list-group">
<li class="list-group-item" v-for="post in list">
<div #click="postUserId = post.userId; isShow = !isShow">
<h4>{{ post.title }}</h4>
<p v-show="show">{{ post.body }}</p>
<span v-show="isShow && postUserId == post.userId" class="label label-primary">ID: {{ post.userId }}</span>
</div>
</li>
</ul>
</div>
</template>

Ember.js - index on nested route duplicating/not destroying on exit

Having an issue with ember not destroying the index on exit.
Controllers/Routes:
App.AccountRoute = Ember.Route.extend({
activate: function () {
//Doing some stuff with login state here. Not important.
}
});
App.AccountController = Ember.Controller.extend({
needs: ['application'], //dependency
account: Ember.computed.alias('controllers.application.accountData'),
states: Ember.computed.alias('controllers.application.states'),
userToken: Ember.computed.alias('controllers.application.userToken'),
tabs: [{'pinned': true, 'name': { 'nestedLink': 'account.index', long: 'Account Overview' }}, {'name': { 'nestedLink': 'account.edit-profile', long: 'Edit Your Company Profile' }}, {'name': { 'nestedLink': 'account.edit-listings', long: 'Edit Your Company Listings' }}, {'name': { 'nestedLink': 'account.edit-payment-methods', long: 'Edit Your Saved Payment Methods' }}, {'name': { 'nestedLink': 'account.view-orders', long: 'View Orders' }}],
});
App.AccountIndexController = Ember.Controller.extend({
needs: ['account']
});
And here's the router:
App.Router.map(function () {
//...
this.resource('account', function() {
this.route('edit-profile');
this.route('edit-listings');
this.route('edit-payment-methods');
this.route('view-orders');
});
});
And the account template is set up like the following with the links to each nested route like: {{#linkTo account.index}}{{/linkTo}} {{#linkTo account.view-orders}}{{/linkTo}}
<script type="text/x-handlebars" data-template-name="account">
<h2>Account for {{account.name.company}}</h2>
<hr />
<div class="row">
<div class="col-md-2 account-sidebar">
<ul class="list-group">
{{#each tabs}}
{{#if pinned}}
{{#linkTo name.nestedLink class="list-group-item pinned-item"}}
{{name.long}}
{{/linkTo}}
{{else}}
{{#linkTo name.nestedLink class="list-group-item"}}
{{name.long}}
{{/linkTo}}
{{/if}}
{{else}}
<p class="text-danger">There are no options for your account.</p>
{{/each}}
</ul>
</div>
<div class="col-md-10 account-content">
{{outlet}}
</div>
</div>
</script>
<script type="text/x-handlebars" data-template-name="account/index">
<h3>Account Overview</h3>
</script>
Switching back and forth between the overview (index) tab and a nested route results in:

You're missing a closing </div> in your "account/index" template. It should be
<script type="text/x-handlebars" data-template-name="account/index">
<h3>Account Overview</h3>
<hr />
<div class="row">
<div class="col-md-6">
<h4>Account Created:</h4>
<p class="text-muted"></p>
</div>
<div class="col-md-6">
<h4>Account Address:</h4>
</p>
</div>
</div>
</script>
See http://emberjs.jsbin.com/novib/3/

Ember - Object has no method 'map'

I am going through the ember.js guides to learn Ember, and I am using the latest builds of ember.js, ember-data.js, and handlebars.js. I am able to successfully set up a basic nav that switches between views. However, upon trying to integrate a model with a {{#each model}}, I get an error message: Uncaught TypeError: Object # has no method 'map'
Many people seem to have asked a related question, but the solution has always been to update the version of ember, which I have already done.
I believe have followed the tutorial precisely and my code so far is as follows.
App = Ember.Application.create();
App.Store = DS.Store.extend({
revision: 12,
// Says we are specifying all models in js
adapter: 'DS.FixtureAdapter'
});
App.Router.map(function() {
this.resource('posts');
this.resource('about');
});
App.PostsRoute = Ember.Route.extend({
model: function() {
return App.Post.find();
}
});
App.Post = DS.Model.extend({
title: DS.attr('string'),
author: DS.attr('string'),
intro: DS.attr('string'),
extended: DS.attr('string'),
publishedAt: DS.attr('date')
});
App.Post.FIXTURES = ({
id: 1,
title: 'Book Title',
author: 'Dave',
publishedAt: new Date('12-27-2012'),
intro: 'This is an introduction to the book',
extended: 'This is an even longer introduction to the book'
}, {
id: 2,
title: 'Book Title 2',
author: 'James',
publishedAt: new Date('08-13-2012'),
intro: 'This is an introduction to another book',
extended: 'This is an even longer introduction to another book'
});
And the relevant markup:
<script type="text/x-handlebars">
<div class="navbar">
<div class="navbar-inner">
{{#linkTo 'index' classNames='brand'}}Brand{{/linkTo}}
<ul class="nav">
<li>{{#linkTo 'about'}}About{{/linkTo}}</li>
<li>{{#linkTo 'posts'}}Posts{{/linkTo}}</li>
</ul>
</div>
</div>
{{outlet}}
</script>
<script type="text/x-handlebars" id="about">
<div class="about">
<p>Here is some text about the page</p>
</div>
</script>
<script type="text/x-handlebars" id="posts">
<div class="container-fluid">
<div class="row-fluid">
<div class="span3">
<table class='table'>
<thead>
<tr><th>Recent Posts</th></tr>
</thead>
{{#each model}}
<tr>
<td>{{title}} <small class='muted'>by {{author}}</small></td>
</tr>
{{/each}}
</table>
</div>
<div class="span9">
</div>
</div>
</div>
</script>
All help is much appreciated, and sorry if the formatting of this question is awful - it's my first question! Cheers!

The main issue here is that your {{#each}} statement is a little malformed, you should be iterating over the controller object like so:
{{#each controller}}
<tr>
<td>{{title}} <small class='muted'>by {{author}}</small></td>
</tr>
{{/each}}
This is because Ember controllers act a a proxy to their object or—in the case of Ember.ArrayController—to their array.

Try using controller instead of model to iterate over the models in an array controller.
{{#each controller}}
<tr>
<td>{{title}} <small class='muted'>by {{author}}</small></td>
</tr>
{{/each}}