To simplify the demo I'm using fake/pointless API)
I have the routers
const routes = [
{ path: '/', component: Menu},
{path: '/books', component: Index,
props: route => ({ api: `https://jsonplaceholder.typicode.com/posts` })
},
{path: '/videos',component: Index,
props: route => ({ api: `https://jsonplaceholder.typicode.com/todos` })
}
]
const router = new VueRouter({ routes })
const app = new Vue({ router }).$mount('#app')
The Menu component
var Menu = Vue.component('Menu', {
template: `<ul>
<li><router-link to="/">home</router-link></li>
<li><router-link :to="{ name: 'videos'}">videos</router-link></li>
<li><router-link :to="{ name: 'books'}">books</router-link></li>
</ul>`})
This is the problem, it does not switch from videos to books.
Finally the Index component
var BookComponent = {
props: {
api: { type: String }
},
data: function () {
return {
items: null,
}
},
mounted: function(){
this.getItems()
},
methods: {
async getItems() {
fetch(this.api).then(res => res.json())
.then(res =>{
this.items = res;
this.loading = false
})
},
},
template: `
<div class="home">
<p v-for="post in items" :key="post.id">{{post.title}}</p>
</div>
`
}
var Home = Vue.component('Home', BookComponent)
var Index = {
props: {
api: {type: String,},
filterBy: {type: String},
},
template: `
<div>
<Menu />
<div class="mainApp" style="margin-top: 40px!important">
<Home :api=api />
</div>
</div>`,
component: { Menu, Home },
};
It doesn't work on jsfiddle but here's the code anyway jsfiddle
You're calling named routes but you haven't defined any name in your routes so either use the path
<li><router-link to="/videos">videos</router-link></li>
<li><router-link to="/books">books</router-link></li>
or name your routes
const routes = [
{ path: '/', component: Menu},
{path: '/books', component: Index, name: 'books',
props: route => ({ api: `https://jsonplaceholder.typicode.com/posts` })
},
{path: '/videos',component: Index, name: 'videos',
props: route => ({ api: `https://jsonplaceholder.typicode.com/todos` })
}
]
To fix navigation - replace objects in router-link attribute to with to='/videos' and to='/books'
To fix render error, add v-if to post items loop, like this:
<div class="home">
<p v-if="items" v-for="post in items" :key="post.id">{{post.title}}</p>
</div>
Here is official docs for vue-router
It seems that I just needed to watch for the route changes and trigger the fetch method again.
watch: {
// call again the method if the route changes
'$route': 'getItems'
}
Related
When I refresh my browser few times when I am on "ActorDetails.vue" page/component, not often but sometimes, I lost my actorsData prop data(should have array of 5 objects but become empty array), at first, I thought it's an API's problem but when I try to console.log() the data inside of "App.js", the data exist... I can't seem to find where the problem is.(Also I did try refresh the browser few times when I am on "ActorsList.vue" page/component, the prop data always exist)
Both pages/components("ActorList.vue" and "ActorDetails.vue") gets topActors data from "App.vue".
(Comments in code)
App.vue
<template>
<div id="app">
<router-view name="homePage" />
<router-view :actorsData="topActors" /> <== "ActorList.vue" and "ActorDetails.vue" use this "router-view"
<div class="over-limit-resolution">Over 4k</div>
</div>
</template>
<script>
import { getActors } from "./util/TheMoveDatabase";
export default {
name: "App",
data() {
return {
topActors: [],
};
},
created() {
getActors.then((result) => {
console.log(result); <== Data always came back from API even when my "actorsData" prop inside of "ActorsDetails.vue" lost it's data.
this.topActors = result;
});
},
methods: {},
};
</script>
ActorsList.vue
<template>
<div class="actors-list">
<router-link to="/">Home</router-link>
<div class="actors-list-container" v-if="allFiveActors">
<div
class="actor-container"
v-for="actorData in actorsData"
:key="actorData.id"
>
<router-link :to="'/actorslist/' + actorData.id">
<h3>{{ actorData.name }} | {{ actorData.id }}</h3>
</router-link>
</div>
</div>
</div>
</template>
<script>
export default {
name: "ActorsList",
props: ["actorsData"],
data() {
return {};
},
computed: {
allFiveActors() {
return this.actorsData.length > 0;
},
},
created() {
console.log(this.actorsData); <== Also tried to refresh the browser when I am on this page/component, prop data always exist.
},
};
ActorsDetails.vue (Page/Component that lost prop data)
<template>
<div class="actor-details">
<router-link to="/actorslist">Actors List</router-link>
<h1>Details page</h1>
<div class="actor-details-container" v-if="actorDetails">
<div class="actor-detail-info">
<h3>{{ actorDetails.name }}</h3>
<p>Birthday: {{ actorDetails.birthday }}</p>
</div>
</div>
</div>
</template>
<script>
import { getActorDetails } from "../util/TheMoveDatabase";
export default {
name: "ActorDetails",
props: ["actorsData", "actorId"],
data() {
return {
actorDetails: {},
};
},
methods: {
checkCurrentActorExist() {
const currentActor = this.getCurrentActor;
// console.log(currentActor);
if (!currentActor) {
// this.$router.push("/");
console.log("does not exist");
}
},
getActor() {
const currentActor = this.getCurrentActor;
console.log(currentActor);
console.log("RAN");
if (currentActor) {
getActorDetails(this.actorId).then((result) => {
this.actorDetails = result;
console.log(this.actorDetails);
});
}
},
},
created() {
this.checkCurrentActorExist();
this.getActor();
console.log(this.actorsData); <== When I am on this page/component and refresh the browser few times, sometimes my "actorsData" prop data is lost.
console.log(this.actorId);
},
computed: {
getCurrentActor() {
return this.actorsData.find(
(actor) => actor.id === parseInt(this.actorId)
);
},
},
};
</script>
Routes.js
import Vue from 'vue';
import VueRouter from 'vue-router';
import Home from '../views/Home.vue';
Vue.use(VueRouter);
const routes = [
{
path: '/',
name: 'Home',
components: {
homePage: Home,
},
},
{
path: '/actorslist',
name: 'ActorsList',
component: () => import('../views/ActorsList.vue'),
},
{
path: '/actorslist/:actorId',
name: 'ActorDetails',
component: () => import('../views/ActorDetails.vue'),
props(route) {
// console.log(route);
return {
actorId: route.params.actorId,
};
},
},
];
const router = new VueRouter({
mode: 'history',
base: process.env.BASE_URL,
routes,
});
export default router;
Just a guess, but maybe your loading-method sometimes takes to much time and the empty array already has been passed to the component.
I would try to clear the array and re-fill it with the loaded data instead of creating a new array (I would try to empty it using splice or pop and then refill it with push)
I am very new to VueJS. How can I get the deviceId in Device component in vuejs. The deviceId in h1 tag was not printed out in the Device component page.
goForward() {
console.log("go forward");
this.$router.push({ name: "Device", params: { deviceId: "Air-conditioning" } });
},
<template>
<div class="about">
<h1>This is the device page {{ deviceId }}</h1>
</div>
</template>
<script>
export default {
name: "Device",
props: ["deviceId"],
data() {
return {};
},
};
</script>
const routes = [
{
path: '/device',
name: 'Device',
component: Device,
},
]
In order to receive your params as props you need to add the props: true option in the route object.
const routes = [
{
path: "/device",
name: "Device",
component: 'Device',
props: true
}
];
https://router.vuejs.org/guide/essentials/passing-props.html#boolean-mode
It's also worth noting that you can improve the URL scheme a bit by adding a route parameter like so:
{
path: "/device/:deviceId",
...
}
Thus, the URL in the address bar will look cleaner:
https://www.example.com/device/Air-conditioning
When I set a component props in the route definition the watcher doesn't work and the view is never updated.
In this example the update works correctly :
const Home = { template: '<div>Home</div>' }
const Test = {
template: '<div>Test : {{ nb }}<br><button #click="addOne" type="button">+1</button></div>',
props: {nb: Number},
methods: {
addOne() {
this.nb++
}
}
}
const router = new VueRouter({
routes: [
{ path: '/', component: Home },
{ name: 'test', path: '/test/:nb', component: Test, props: true }
]
})
new Vue({
router,
el: '#app'
})
<script src="https://npmcdn.com/vue/dist/vue.js"></script>
<script src="https://npmcdn.com/vue-router/dist/vue-router.js"></script>
<div id="app">
<router-link to="/">/home</router-link>
<router-link :to="{ name: 'test', params: { nb: 42 }}">/test</router-link>
<router-view></router-view>
</div>
Note : This example show a "mutating a prop directly" warning, but it's just for the simplicity it's not related to the issue since I don't do that in my code.
In this example the update doesn't work :
const Home = { template: '<div>Home</div>' }
const Test = {
template: '<div>Test : {{ counter.value }}<br><button #click="addOne" type="button">+1</button></div>',
props: {counter: Object},
methods: {
addOne() {
this.counter.value++
console.log('new value : ' + this.counter.value)
}
}
}
class Counter {
constructor(value) {
this.value = value
}
}
const router = new VueRouter({
routes: [
{ path: '/', component: Home },
{
name: 'test',
path: '/test/:nb',
props: (route) => ({counter: new Counter(route.params.nb)}),
component: Test
}
]
})
new Vue({
router,
el: '#app'
})
<script src="https://npmcdn.com/vue/dist/vue.js"></script>
<script src="https://npmcdn.com/vue-router/dist/vue-router.js"></script>
<div id="app">
<router-link to="/">/home</router-link>
<router-link :to="{ name: 'test', params: { nb: 42 }}">/test</router-link>
<router-view></router-view>
</div>
The counter object won't be reactive, so property changes won't be detected. Passing an object as a prop does not add reactivity.
I've just changed one line in your example:
props: (route) => ({counter: Vue.observable(new Counter(route.params.nb))}),
Passing the object to Vue.observable will apply the reactivity.
Note that 'applying reactivity' means rewriting all of the properties to use getters and setters. In the simple example presented here that just means the value property, which should be fine. Vue can only rewrite properties it can see, so any data hidden within closures would not be accessible.
const Home = { template: '<div>Home</div>' }
const Test = {
template: '<div>Test : {{ counter.value }}<br><button #click="addOne" type="button">+1</button></div>',
props: {counter: Object},
methods: {
addOne() {
this.counter.value++
console.log('new value : ' + this.counter.value)
}
}
}
class Counter {
constructor(value) {
this.value = value
}
}
const router = new VueRouter({
routes: [
{ path: '/', component: Home },
{
name: 'test',
path: '/test/:nb',
props: (route) => ({counter: Vue.observable(new Counter(route.params.nb))}),
component: Test
}
]
})
new Vue({
router,
el: '#app'
})
<script src="https://npmcdn.com/vue/dist/vue.js"></script>
<script src="https://npmcdn.com/vue-router/dist/vue-router.js"></script>
<div id="app">
<router-link to="/">/home</router-link>
<router-link :to="{ name: 'test', params: { nb: 42 }}">/test</router-link>
<router-view></router-view>
</div>
Part of the reason why Vue does not automatically apply reactivity to objects passed as props is that the receiving component shouldn't be modifying the object anyway. It's a violation of one-way data flow. In this example you should probably be updating the route directly rather than modifying the counter object.
I have created a vue-router with a page title (h1).
Every vue-router link has a meta-title. How can I dynamically set my h1 page title?
I have tried $emit, but this is not working in my router. How can I change my page title?
const dashboard = {
template: `<div>DASHBOARD</div>`
}
const about = {
template: `<div>ABOUT</div>`
}
const routes = [
{path: '/dashboard', component: dashboard, name:'dashboard', meta: { title: 'Dashboard' }},
{path: '/about', component: about, name:'about', meta: { title: 'About' }}
]
const router = new VueRouter({
routes // short for routes: routes
})
router.beforeEach((to, from, next) => {
this.$emit('pagetitle', to.meta.title); // DOESN'T WORK!!
next();
});
new Vue({
el: '#app',
router,
data() {
return {
pagetitle: 'not set'
}
},
watch: {
'$route': function(value) {
// I can use things like value.name === 'about', but "watch" doesn't set the page title at the first page load.
}
}
})
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script src="https://unpkg.com/vue-router/dist/vue-router.js"></script>
<div id="app">
<router-link to="/dashboard">Dashboard</router-link>
<router-link to="/about">About</router-link>
<router-view></router-view>
<h1 v-text="pagetitle"></h1>
How can I change the page title???
</div>
In your <h1></h1> tag, just use the following
{{ $route.meta.title }}
If you would like to have correct browser history use this one:
router.afterEach((to, from) => {
Vue.nextTick( () => {
document.title = to.meta.title ? to.meta.title : 'default title';
});
})
Also if you need to change the document's title-tag, in your router.beforeEach replace this line :
this.$emit('pagetitle', to.meta.title);
with
document.title = to.meta.title;
It will work.
I am playing with an example given from vue-router documentation
HTML:
<div id="app">
<h3>{{title}}</h3>
<router-link to="/">/home</router-link>
<router-link to="/foo">/foo</router-link>
<router-view></router-view>
</div>
JavaScript:
const Foo = { template: '<div>foo</div>', data: {title: "Foo" }
const Bar = { template: '<div>bar</div>', data: {title: "Bar" }
Is it possible to access selected component data outside anchor and update {{title}} header?
Full example is here
I've two possibilities. First one is to edit your parent data directly with this.$parent.title.
And the second way is to trigger an event this.$parent.$emit('changeTitle', 'foo');.
I think the last one is better, because the control of your state is always in your parent component.
const Home = {
template: '<div>Home</div>',
data: {
title: "Home"
},
mounted() {
this.$parent.title = 'home'; // directly
}
}
const Foo = {
template: '<div>Foo</div>',
data: {
title: "Foo"
},
mounted() {
this.$parent.$emit('changeTitle', 'foo'); // emit an event
}
}
const router = new VueRouter({
mode: 'history',
routes: [
{
path: '/',
component: Home
},
{
path: '/foo',
component: Foo
}
]
})
new Vue({
router,
el: '#app',
data: {
title: 'Initial'
},
destroy() {
this.$off('changeTitle');
},
created() {
const _self = this;
this.$on('changeTitle', function(newTitle) {
_self.title = newTitle;
});
}
})
<script src="https://npmcdn.com/vue/dist/vue.js"></script>
<script src="https://npmcdn.com/vue-router/dist/vue-router.js"></script>
<div id="app">
<h3>{{title}}</h3>
<router-link to="/">/home</router-link>
<router-link to="/foo">/foo</router-link>
<router-view></router-view>
</div>