Difference between revisions of "Vue.js"
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==Vuex== | ==Vuex== | ||
+ | ===Concepts=== | ||
* Single state tree - single source of truth | * Single state tree - single source of truth | ||
+ | * Modules | ||
+ | ===Four types of methods=== | ||
* State | * State | ||
* Getters | * Getters | ||
− | * Actions | + | * Actions |
+ | ** Called from components to commit a mutation | ||
+ | ** Great for asynchronous calls | ||
+ | ** Can do multiple mutations | ||
* Mutations | * Mutations | ||
− | * | + | ===Vocabulary=== |
+ | * Dispatch actions versus commit mutations | ||
+ | * <code>const jokes = await fetch( 'jokes.json' )</code> | ||
+ | * Commit a mutation | ||
+ | |||
===store/index.js=== | ===store/index.js=== | ||
<pre> | <pre> |
Revision as of 17:33, 13 February 2020
Contents
Vue.js
Files
index.html
- has
<div id="app"
and script includes main.js
main.js
- contains instantiation of Vue instance
import Vue from 'vue'; import App from './App.vue'; import store from './store'; new Vue( { store, render: h => h(App) }).$mount( '#app' );
App.vue
- top level component into which we compose other components
- App-level arg array contains:
const app = new Vue({
- el: "#app" - el stands for element, maps back to the div in index.html
- data
- computed - contains methods. One-off computations in our dataset. Get access to the data using $this
- filters - also contains methods that take arguments. Pass arguments to filter method inside the mustache using the pipe separator
- methods - can take an argument
- lifecycle methods
- beforeCreate
- mounted() fires when your app attaches to the DOM, a good time to fetch some data
- beforeDestroy()
router/index.js
- Entrypoint into Vue Router
store/index.js
- Entrypoint into Vuex
Directives
- directive inside HTML tags start with v-
v-bind:____="someDataStoreObj
- bind keeps something up-to-date with some data store propertyv-if="varName"
v-for:"i in datastoreobj"
v-on:click="someMethod"
- binds a function to button<input v-model="message">
- direct two-way binding between input and app state
Component
- How you create a new HTML tag, you must register them
- Template can only return one top level element, if you need to return two, wrap within a div.
- Computed property - double mustache inside the component template
- Component scaffold has template, script, and style
export default {
- props: ['id, 'age', 'weight] }
- name = "component_name"
- components: [ subcomponent1, subcomponent2 ]
<style scoped>
Vue Instance
Vuex
Concepts
- Single state tree - single source of truth
- Modules
Four types of methods
- State
- Getters
- Actions
- Called from components to commit a mutation
- Great for asynchronous calls
- Can do multiple mutations
- Mutations
Vocabulary
- Dispatch actions versus commit mutations
const jokes = await fetch( 'jokes.json' )
- Commit a mutation
store/index.js
import Vuex from 'vuex'; import ModuleName from './modules/ModulName' // Load Vuex Vue.use( Vuex ); // Create store export default new Vuex.store( { modules: { ModuleName } } );
Vue Router
- Single Page App (SPA)
- In main.js, import the router directory, and add router to the list of properties inside
new Vue
declaration - In App.vue, add
<router-view/>
tag.- router link is an a tag:
<router-link to="pathfromindexjs">Page Name</router-link>
- router link is an a tag:
- In router/index.js
- After imports, add
Vue.use(Router)
export default new Router( { routes: [ {path: '/', name: 'Hello', component: HelloWorld} ]
- Map a route to a property
export default new Router( { routes: [ {path: '/:prop1/:prop2/:prop3', name: 'Hello', component: HelloWorld, props: true} ]
- After imports, add
Vue CLI
npm install -g @vue/cli
vue --version
vue ui
- Create new project, include vuex and vue router components
- Run Project task 1: serve
- Run Project task 2 (build):
2018 Tech Stack
- container
- nginx
- node.js
- TypeScript lang
- React & webpack + TypeScript