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More reliable strategy for getting deepmost component + addition of refresh() method + example & documentation on asynchronous updates

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This commit is contained in:
Declan de Wet
2016-11-09 07:26:38 +02:00
parent fa290273df
commit 076832cbd6
18 changed files with 268 additions and 45 deletions
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README.md
+36
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@@ -74,6 +74,7 @@
- [FAQ](#faq)
- [How do I use component data in `metaInfo`?](#how-do-i-use-component-data-in-metainfo)
- [How do I use component props in `metaInfo`?](#how-do-i-use-component-props-in-metainfo)
- [How do I populate `metaInfo` from the result of an asynchronous action?](#how-do-i-populate-metainfo-from-the-result-of-an-asynchronous-action)
<!-- END doctoc generated TOC please keep comment here to allow auto update -->
@@ -675,3 +676,38 @@ The same way you use data - specify a function instead of an object. It will nee
}
</script>
```
## How do I populate `metaInfo` from the result of an asynchronous action?
`vue-meta` exposes a method called `refresh` on the client-side that allows you to trigger an update at any given point in time.
In the same way you access `$meta().inject()` on the server, you can access `$meta().refresh()`.
For example, if you're using Vuex and you have an action that fetches a `post` asynchronously, you should ensure that it returns a promise so that you are notified when the fetching is complete:
```js
{
actions: {
async fetchPost ({ commit }, payload) {
const post = yield db.fetch('posts', payload.postId)
commit('fetchedPost', post)
}
}
}
```
Then in your component, you can call `refresh()` to trigger an update once the fetch is complete:
```js
{
beforeMount () {
const postId = this.$router.params.id
this.$store.dispatch('fetchPost', { postId })
.then(() => this.$meta().refresh())
}
}
```
Just make sure that whatever data source you're using (`store` if you're using Vuex, component `data` otherwise) has some sane defaults set so Vue doesn't complain about `null` property accessors.
Check out the [vuex-async](https://github.com/declandewet/vue-meta/tree/master/examples/vuex-async) example for a far more detailed demonstration of how this works.
examples/index.html
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@@ -11,6 +11,7 @@
<li><a href="basic-render">Basic Render</a></li>
<li><a href="vue-router">Usage with vue-router</a></li>
<li><a href="vuex">Usage with vuex</a></li>
<li><a href="vuex-async">Usage with vuex + async actions</a></li>
</ul>
</body>
</html>
examples/vuex-async/App.vue
+7
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@@ -0,0 +1,7 @@
<template>
<div id="app">
<h1>vuex-async</h1>
<router-view></router-view>
<p>Inspect Element to see the meta info</p>
</div>
</template>
examples/vuex-async/app.js
+9
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@@ -0,0 +1,9 @@
import assign from 'object-assign'
import Vue from 'vue'
import store from './store'
import router from './router'
import App from './App.vue'
const app = new Vue(assign(App, { router, store }))
app.$mount('#app')
examples/vuex-async/index.html
+5
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@@ -0,0 +1,5 @@
<!DOCTYPE html>
<link rel="stylesheet" href="/global.css">
<a href="/">&larr; Examples index</a>
<div id="app"></div>
<script src="/__build__/vuex-async.js"></script>
examples/vuex-async/router.js
+17
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@@ -0,0 +1,17 @@
import Vue from 'vue'
import Router from 'vue-router'
import Meta from 'vue-meta'
import Home from './views/Home.vue'
import Post from './views/Post.vue'
Vue.use(Router)
Vue.use(Meta)
export default new Router({
mode: 'history',
base: '/vuex-async',
routes: [
{ path: '/', component: Home },
{ path: '/posts/:slug', component: Post }
]
})
examples/vuex-async/store.js
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@@ -0,0 +1,77 @@
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
export default new Vuex.Store({
// STATE
state: {
isLoading: false,
// its important that we set some defaults for the current post
// otherwise Vue will complain that properties are `null`
post: {
title: '',
content: '',
slug: '',
published: false
},
posts: [{
slug: 'a-sample-blog-post',
title: 'A Sample Blog Post',
content: 'This is the blog post content',
published: true
}, {
slug: 'an-unpublished-blog-post',
title: 'An Unpublished Blog Post',
content: 'This is the blog post content',
published: false
}, {
slug: 'another-blog-post',
title: 'Another Blog Post',
content: 'This is the blog post content',
published: true
}]
},
// GETTERS
getters: {
isLoading (state) {
return state.isLoading
},
post (state) {
return state.post
},
publishedPosts (state) {
return state.posts.filter((post) => post.published)
},
publishedPostsCount (state, getters) {
return getters.publishedPosts.length
}
},
// MUTATIONS
mutations: {
loadingState (state, { isLoading }) {
state.isLoading = isLoading
},
getPost (state, { slug }) {
state.post = state.posts.find((post) => post.slug === slug)
}
},
// ACTIONS
actions: {
getPost ({ commit }, payload) {
commit('loadingState', { isLoading: true })
// we have to return a promise from this action so we know
// when it is finished
return new Promise((resolve) => {
setTimeout(() => {
commit('getPost', payload)
resolve()
}, 2000)
})
.then(() => commit('loadingState', { isLoading: false }))
}
}
})
examples/vuex-async/views/Home.vue
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@@ -0,0 +1,26 @@
<template>
<div>
<h3>This is the homepage</h3>
<h4>There are <u>{{ postsCount }}</u> published posts</h4>
<ul>
<li v-for="post in posts">
<router-link :to="'posts/' + post.slug">{{ post.title }}</router-link>
</li>
</ul>
</div>
</template>
<script>
import { mapGetters } from 'vuex'
export default {
name: 'home',
computed: mapGetters({
posts: 'publishedPosts',
postsCount: 'publishedPostsCount'
}),
metaInfo: {
title: 'Home'
}
}
</script>
examples/vuex-async/views/Post.vue
+37
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@@ -0,0 +1,37 @@
<template>
<div>
<template v-if="isLoading">
<h3>Loading...</h3>
</template>
<template v-else>
<h3>{{ post.title }}</h3>
<p>{{ post.content}}<p>
<router-link to="/">Go back home</router-link>
</template>
</div>
</template>
<script>
import { mapGetters } from 'vuex'
export default {
name: 'post',
beforeMount () {
const { slug } = this.$route.params
// since fetching a post is asynchronous,
// we need to call `this.$meta().refresh()`
// to update the meta info
this.$store.dispatch('getPost', { slug })
.then(() => this.$meta().refresh())
},
computed: mapGetters([
'isLoading',
'post'
]),
metaInfo: {
title () {
return this.isLoading ? 'Loading...' : this.post.title
}
}
}
</script>
examples/vuex/store.js
+9 -1
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@@ -6,7 +6,15 @@ Vue.use(Vuex)
export default new Vuex.Store({
// STATE
state: {
post: null,
isLoading: false,
// its important that we set some defaults for the current post
// otherwise Vue will complain that properties are `null`
post: {
title: '',
content: '',
slug: '',
published: false
},
posts: [{
slug: 'a-sample-blog-post',
title: 'A Sample Blog Post',
examples/vuex/views/Post.vue
+1 -1
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@@ -10,7 +10,7 @@
import { mapGetters } from 'vuex'
export default {
name: 'blog-post',
name: 'post',
beforeMount () {
const { slug } = this.$route.params
this.$store.dispatch('getPost', { slug })
src/client/refresh.js
+18
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@@ -0,0 +1,18 @@
import getMetaInfo from '../shared/getMetaInfo'
import updateClientMetaInfo from './updateClientMetaInfo'
/**
* When called, will update the current meta info with new meta info.
* Useful when updating meta info as the result of an asynchronous
* action that resolves after the initial render takes place.
*
* Credit to [Sébastien Chopin](https://github.com/Atinux) for the suggestion
* to implement this method.
*
* @return {Object} - new meta info
*/
export default function refresh () {
const info = getMetaInfo(this.$root)
updateClientMetaInfo(info)
return info
}
src/server/$meta.js → src/shared/$meta.js
+6 -2
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@@ -1,4 +1,5 @@
import inject from './inject'
import inject from '../server/inject'
import refresh from '../client/refresh'
/**
* Returns an injector for server-side rendering.
@@ -7,5 +8,8 @@ import inject from './inject'
*/
export default function $meta () {
// bind inject method to this component
return { inject: inject.bind(this) }
return {
inject: inject.bind(this),
refresh: refresh.bind(this)
}
}
src/shared/getComponentOption.js
+7 -4
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@@ -12,9 +12,11 @@ import deepmerge from 'deepmerge'
* @param {Boolean} opts.deep - look for data in child components as well?
* @param {Function} opts.arrayMerge - how should arrays be merged?
* @param {Object} [result={}] - result so far
* @return {Object} - final aggregated result
* @return {Object} result - final aggregated result
* @return {Object} result.mergedOption - the actual merged options
* @return {Object} result.deepestComponentWithMetaInfo - the deepest component in the heirarchy that has a `metaInfo` instance property
*/
export default function getComponentOption (opts, result = {}) {
export default function getComponentOption (opts, result = { mergedOption: {} }) {
const { component, option, deep, arrayMerge } = opts
const { $options } = component
@@ -24,12 +26,13 @@ export default function getComponentOption (opts, result = {}) {
if (typeof data === 'object') {
// merge with existing options
result = deepmerge(result, data, {
result.mergedOption = deepmerge(result.mergedOption, data, {
clone: true,
arrayMerge
})
result.deepestComponentWithMetaInfo = component
} else {
result = data
result.mergedOption = data
}
}
src/shared/getMetaInfo.js
+2 -4
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@@ -1,6 +1,5 @@
import deepmerge from 'deepmerge'
import getComponentOption from './getComponentOption'
import mergeComponentData from './mergeComponentData'
/**
* Returns the correct meta info for the given component
@@ -26,7 +25,7 @@ export default function getMetaInfo (component) {
}
// collect & aggregate all metaInfo $options
const info = getComponentOption({
const { mergedOption: info, deepestComponentWithMetaInfo } = getComponentOption({
component,
option: 'metaInfo',
deep: true,
@@ -73,13 +72,12 @@ export default function getMetaInfo (component) {
}
const metaInfo = deepmerge(defaultInfo, info)
const componentData = mergeComponentData(component)
// inject component context into functions & call to normalize data
Object.keys(metaInfo).forEach((key) => {
const val = metaInfo[key]
if (typeof val === 'function') {
metaInfo[key] = val.call(componentData)
metaInfo[key] = val.call(deepestComponentWithMetaInfo)
}
})
src/shared/mergeComponentData.js
-18
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@@ -1,18 +0,0 @@
import assign from 'object-assign'
/**
* Recursively shallow-merges component object with it's children component objects.
* This function is responsible for obtaining the `this` context of metaInfo props when
* declared in function form.
*
* @param {Object} component - the component object
* @return {Object} - the merged data
*/
export default function mergeComponentData (component) {
if (component.$children.length) {
return component.$children.reduce((data, child) => {
return assign({}, data, mergeComponentData(child))
}, component)
}
return component
}
src/shared/plugin.js
+2 -7
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@@ -1,6 +1,4 @@
import getMetaInfo from './getMetaInfo'
import $meta from '../server/$meta'
import updateClientMetaInfo from '../client/updateClientMetaInfo'
import $meta from './$meta'
// automatic install
if (typeof Vue !== 'undefined') {
@@ -26,10 +24,7 @@ export default function VueMeta (Vue) {
requestId = window.requestAnimationFrame(() => {
requestId = null
const info = getMetaInfo(this.$root)
// update the meta info
updateClientMetaInfo(info)
this.$meta().refresh()
})
}
})
test/getComponentOption.spec.js
+8 -8
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@@ -9,14 +9,14 @@ describe('getComponentOption', () => {
it('returns an empty object when no matching options are found', () => {
component = new Vue()
const fetchedOption = getComponentOption({ component, option: 'noop' })
expect(fetchedOption).to.eql({})
const { mergedOption } = getComponentOption({ component, option: 'noop' })
expect(mergedOption).to.eql({})
})
it('fetches the given option from the given component', () => {
component = new Vue({ someOption: 'foo' })
const fetchedOption = getComponentOption({ component, option: 'someOption' })
expect(fetchedOption).to.eql('foo')
const { mergedOption } = getComponentOption({ component, option: 'someOption' })
expect(mergedOption).to.eql('foo')
})
it('fetches deeply nested component options and merges them', () => {
@@ -28,8 +28,8 @@ describe('getComponentOption', () => {
el: container
})
const fetchedOption = getComponentOption({ component, option: 'foo', deep: true })
expect(fetchedOption).to.eql({ bar: 'baz', fizz: 'buzz' })
const { mergedOption } = getComponentOption({ component, option: 'foo', deep: true })
expect(mergedOption).to.eql({ bar: 'baz', fizz: 'buzz' })
})
it('allows for a custom array merge strategy', () => {
@@ -48,7 +48,7 @@ describe('getComponentOption', () => {
el: container
})
const fetchedOption = getComponentOption({
const { mergedOption } = getComponentOption({
component,
option: 'foo',
deep: true,
@@ -57,7 +57,7 @@ describe('getComponentOption', () => {
}
})
expect(fetchedOption).to.eql([
expect(mergedOption).to.eql([
{ name: 'flower', content: 'tulip' },
{ name: 'flower', content: 'rose' }
])