Use of vue components in practical cases-JS Tutorial-php.cn

Use of vue components in practical cases

php中世界最好的语言

Release： 2018-06-08 11:20:49

Original

1699 people have browsed it

This time I will bring you the use of vue components in practical cases. What are the precautions for using vue components in practical cases? The following is a practical case, let's take a look.

zProject technology:

webpack vue element axois (vue-resource) less-loader...

Vue operation method case:

1. The array data has not been obtained, and a preloaded animation is made

<el-carousel :interval="3000" type="card" height="200px" class="common-mt-md">
   <el-carousel-item v-for="item in movieArr" :key="item.id" class="text-center">
    <img v-bind:src="item.images.small" alt="电影封面" class="ticket-index-movie-img">
   </el-carousel-item>// 实际显示的内容-跑马灯
   <p v-if="!movieArr.length" class="ticket-index-movie-loading">
    <span class="el-icon-loading "></span>
   </p>// 当 movirArr的数组为空的时候，做出的预加载 loading 
</el-carousel>

Copy after login

2. Determining the button status, The question of whether the button can be clicked

<p v-if="!multipleSelection.length">
  <el-button type="success" round disabled>导出</el-button>
</p><!-- 不能点， 判断数组为空 -->
<p v-else>
  <el-button type="success" round >导出</el-button>
</p><!-- 可以点， 判断数组为不为空 -->

Copy after login

3. Like jquery, append dom (vue is data-oriented and should get rid of the complicated operations of jquery's dom)

<el-form-item label="时间" prop="name">
  <el-input v-model="ruleForm.name"></el-input>//绑定模型，检测输入的格式
  <span class="el-icon-plus ticket-manage-timeinput" @click="addTime(this)"></span>//绑定方法，增加dom的操作
 </el-form-item> 
<el-form-item label="时间" prop="name" v-for="item in timeArr" :key=&#39;item.id&#39;>  //timeArr数组与数据就渲染下面的dom，没有就不显示
　　<el-input v-model="ruleForm.name"></el-input> 
　　<span class="el-icon-minus ticket-manage-timeinput" @click="minusTime(this)"></span> 
</el-form-item>

Copy after login

js:

Equivalent to the dom string in jq

 timeInputString: '<el-input v-model="ruleForm.name"></el-input><span class="el-icon-minus"></span>'

Copy after login

Native js pushes and pops data into the array (grabs the length of the array), because vue is driven by data and judged by data. The dom

 addTime () {
 this.timeArr.push('str')
 },
 minusTime () {
 this.timeArr.shift('str')
 }

Copy after login

should not be rendered. 4. Add a class. When the scene is looping a certain list, a certain list has a class and is bound to a method, which can support passing parameters

dom

<li v-for="section in item.sections" :key=&#39;section.id&#39; @click="hideParMask" :class="getSectionId(section.id)">
 <router-link :to="{ name: &#39;learning&#39;, params: { sectionId: section.id}, query: { courseId: courseId}}" >
   <span>{{item.orderInCourse}}.{{section.sectionNumber}}</span>
   <span>{{section.name}}</span>
 </router-link>
</li>

Copy after login

getSectionId (sectionId) {
 return {
  active: this.$route.params.sectionId === sectionId,
 }
}

Copy after login

5. Child->parent component communication, vue.$emit vue.on

Child component:

getSectionId (sectionId) {
 return {
  active: this.$route.params.sectionId === sectionId,
 }
}

Copy after login

Parent component:

dom

<v-child :courseId="courseId" v-on:receiveTitle="receiveTitle"></v-child>

Copy after login

methods: {
 receiveTitle (name) {
  this.titleName = name; // titleName 就是 **@课程
 }
}

Copy after login

Summary routine: The child component uses a function (event) to pass the receiveTitle attribute to the parent component, and then the parent component monitors this attribute and binds a method to this attribute. receiveTitle, the method passes parameters, this parameter is the value to be passed

6. Parent-> Child

Parent component:

dom:

<course-tab :courseList = courseList ></course-tab>

Copy after login

js:

courseList().then(res => {
 this.courseList = res.data.courses;
 }).catch( err => {
 console.log(err)
});

Copy after login

Subcomponent:

 props: {
  courseList: {
   type: Array
  }
 }

Copy after login

Summary routine: the parent component passes the variable to the subcomponent, you need to bind this variable on the subcomponent label, and then the subcomponent can be in the props Accept this variable

7. Handle error routing, redirect, add routing information in the router

{
  path: '*',
  redirect: '/'
}

Copy after login

Here is a redirect to the home page, or you can make a separate 404 page and redirect Go to this page

Programmatic navigation,

router.push({ path: 'login-regist' })  // 如果这样写的话，会寻找路由最近的 / 然后在后面直接拼接login-regist；
为了防止在多级嵌套路由里面出现bug ,应该写全路由的全部信息，包括 /
router.push({ path: '/login-regist' })

Copy after login

8. Splice css in dom

<p class="img" :style="{background: &#39;url(&#39; + item.logoFileURL + &#39;)&#39;}"></p>

Copy after login

9. Monitor scrolling events

data () {
  return {
   scrolled: false，
　　　　show: true
  }
},
methods: {
  handleScroll () {
   this.scrolled = window.scrollY > 0;
   if (this.scrolled) {
    this.show = false;
   }
  }
 },
 mounted () {
  window.addEventListener('scroll', this.handleScroll);
 }

Copy after login

10. Monitor input Changes in the box input value

@input="search"，

Copy after login

The method of monitoring the <el-input of element-UI,

<el-input v-model="input" @keyup.enter.native="add" placeholder="请输入内容" >I believe you have mastered the method after reading the case in this article, and more How exciting, please pay attention to other related articles on php Chinese website! 
Recommended reading: 
Detailed explanation of render case in React

Detailed explanation of Vue Mixin function use case
 
The above is the detailed content of Use of vue components in practical cases. For more information, please follow other related articles on the PHP Chinese website!