How to use Vue to implement tree view data-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

How to use Vue to implement tree view data

php中世界最好的语言

May 31, 2018 am 10:22 AM

accomplish view

This time I will show you how to use Vue to implement tree view data, and what are the precautions for using Vue to implement tree view data. The following is a practical case, let's take a look.

Using a simple tree view implementation, I am familiar with the recursive use of components

This is the simulated tree view data

let all={ 
  name:'all', 
  children:{ 
   A:{ 
    name:'A', 
    children:{ 
     a1:{ 
      name:'a1', 
      children:{ 
       a11:{  
        name:'a11', 
        children:null 
       }, 
       a12:{  
        name:'a12', 
        children:null 
       } 
      } 
     }, 
     a2:{ 
      name:'a2', 
      children:{ 
       b21:{  
        name:'b21', 
        children:null 
       } 
      } 
     } 
    } 
   }, 
   B:{ 
    name:'B', 
    children:{ 
     b1:{ 
      name:'b1', 
      children:{ 
       b11:{  
        name:'b11', 
        children:null 
       }, 
       b12:{  
        name:'b12', 
        children:null 
       } 
      } 
     }, 
     b2:{ 
      name:'b2', 
      children:{ 
       b21:{  
        name:'b21', 
        children:null 
       } 
      } 
     } 
    } 
   } 
  } 
 }

Copy after login

The code is as follows

treelist.vue

<template> 
<p> 
 <ul> 
  <li > 
   <span @click="isshow()">{{treelist.name}}</span> 
    <tree v-for="item in treelist.children"  
     v-if="isFolder" 
     v-show="open" 
     :treelist="item" 
     :keys="item" 
    ></tree> 
  </li> 
 </ul> 
</p> 
</template> 
<script> 
export default { 
 name:'tree', 
 props:['treelist'], 
 data(){ 
  return{ 
   open:false 
  } 
 },computed:{ 
  isFolder:function(){ 
   return this.treelist.children 
   } 
  } 
 ,methods:{ 
  isshow(){ 
   if (this.isFolder) { 
    this.open =!this.open 
   } 
  } 
 } 
} 
</script> 
<style lang="less"> 
</style>

Copy after login

index.html

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="UTF-8"> 
 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
 <meta http-equiv="X-UA-Compatible" content="ie=edge"> 
 <title>树形图</title> 
</head> 
<body> 
 <p id="app"> 
  <tree :treelist="treeList"></tree> 
   
 </p> 
</body> 
</html>

Copy after login

index.js

import Vue from 'vue'; 
import tree from '../components/treelist.vue' 
let all={ 
  name:'all', 
  children:{ 
   A:{ 
    name:'A', 
    children:{ 
     a1:{ 
      name:'a1', 
      children:{ 
       a11:{  
        name:'a11', 
        children:null 
       }, 
       a12:{  
        name:'a12', 
        children:null 
       } 
      } 
     }, 
     a2:{ 
      name:'a2', 
      children:{ 
       b21:{  
        name:'b21', 
        children:null 
       } 
      } 
     } 
    } 
   }, 
   B:{ 
    name:'B', 
    children:{ 
     b1:{ 
      name:'b1', 
      children:{ 
       b11:{  
        name:'b11', 
        children:null 
       }, 
       b12:{  
        name:'b12', 
        children:null 
       } 
      } 
     }, 
     b2:{ 
      name:'b2', 
      children:{ 
       b21:{  
        name:'b21', 
        children:null 
       } 
      } 
     } 
    } 
   } 
  } 
 } 
const app=new Vue({ 
 el:"#app", 
 components:{ 
  'tree':tree 
 }, 
 data:{ 
  treeList:all 
 } 
})

Copy after login

After going through the pitfalls, I found a similar case on the Vue official website. Link → Portal

After referring to the method on the official website, I tried to implement it

The difference between writing this way and my idea when I stepped on the trap is that such a component is only responsible for one

Object, traverse the objects in each children, and pass them into the component for processing one by one. My first attempt was to pass the entire children into itself. It is a component that processes multiple objects. (The failure case of the first attempt , please see the bottom if you are interested)

What are the benefits of writing such a component to process an object?

I can customize the switch in the component

I am in data

variableopen is defined in it. Because the component is recursive, it is equivalent to each component having its own open

So why couldn't I use this method when I first stepped on the trap? Because my first attempt was to use a component to handle multiple objects, which is equivalent to a switch controlling all the objects in children. When the switch is turned on, this will occur at the same time. All objects at the level are expanded

Traverse the children and pass in the component itself one by one. Use v-show to control whether to display

Definition A calculated

attribute is used to determine whether to continue execution based on children

A custom event is bound to the span tag

Change the value of open

<span @click="isshow()">{{treelist.name}}</span>

Copy after login

Achieve the effect

The following is the pitfall I encountered when I first tried it

Record it here, and leave an impression when encountering similar problems in the future

I encountered such an error when I first came up

#After looking for the problem for a long time, I found that it was because I forgot to write the name in the component. When I use it, I must fill in the name and make it consistent with the label name

#The initial implementation method uses component recursion to display the name of the current level and render it, and pass all the objects in the children to itself. Then continue to perform the same operation until children have no data. It is worth mentioning that

, if v-if is not added here, it will become The infinite loop will continue to execute, so we need to determine whether the currently executed object has a next level

My data has been slightly changed here, so I The first data passed in is (index.html page)

Then I defined an event to handle the closing and opening of each layer. I used the pop-up box to see whether the value of Isopen was changed.

Let’s take a look at the results.

When I first entered the page, the undefined in the brackets was the current value of Isopen. Because it was not defined at this time, it was undefined

Then I clicked A

Because isopen has been inverted at this time, so isopen is true at this time

But the page is still empty No change, not to mention the expansion function, even undefined has not changed

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related topics on the PHP Chinese website article!

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Assassin's Creed Shadows: Seashell Riddle Solution

4 weeks ago By DDD

What's New in Windows 11 KB5054979 & How to Fix Update Issues

3 weeks ago By DDD

Where to find the Crane Control Keycard in Atomfall

4 weeks ago By DDD

Roblox: Dead Rails - How To Complete Every Challenge

1 months ago By DDD

Atomfall guide: item locations, quest guides, and tips

1 months ago By DDD

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Where is the login entrance for gmail email?

7704

Java Tutorial

1640

CakePHP Tutorial

1393

Laravel Tutorial

1288

PHP Tutorial

1231

Related knowledge

How to implement dual WeChat login on Huawei mobile phones? Mar 24, 2024 am 11:27 AM

How to implement dual WeChat login on Huawei mobile phones? With the rise of social media, WeChat has become one of the indispensable communication tools in people's daily lives. However, many people may encounter a problem: logging into multiple WeChat accounts at the same time on the same mobile phone. For Huawei mobile phone users, it is not difficult to achieve dual WeChat login. This article will introduce how to achieve dual WeChat login on Huawei mobile phones. First of all, the EMUI system that comes with Huawei mobile phones provides a very convenient function - dual application opening. Through the application dual opening function, users can simultaneously

PHP Programming Guide: Methods to Implement Fibonacci Sequence Mar 20, 2024 pm 04:54 PM

The programming language PHP is a powerful tool for web development, capable of supporting a variety of different programming logics and algorithms. Among them, implementing the Fibonacci sequence is a common and classic programming problem. In this article, we will introduce how to use the PHP programming language to implement the Fibonacci sequence, and attach specific code examples. The Fibonacci sequence is a mathematical sequence defined as follows: the first and second elements of the sequence are 1, and starting from the third element, the value of each element is equal to the sum of the previous two elements. The first few elements of the sequence

How to implement the WeChat clone function on Huawei mobile phones Mar 24, 2024 pm 06:03 PM

How to implement the WeChat clone function on Huawei mobile phones With the popularity of social software and people's increasing emphasis on privacy and security, the WeChat clone function has gradually become the focus of people's attention. The WeChat clone function can help users log in to multiple WeChat accounts on the same mobile phone at the same time, making it easier to manage and use. It is not difficult to implement the WeChat clone function on Huawei mobile phones. You only need to follow the following steps. Step 1: Make sure that the mobile phone system version and WeChat version meet the requirements. First, make sure that your Huawei mobile phone system version has been updated to the latest version, as well as the WeChat App.

Understand the differences and comparisons between SpringBoot and SpringMVC Dec 29, 2023 am 09:20 AM

Compare SpringBoot and SpringMVC and understand their differences. With the continuous development of Java development, the Spring framework has become the first choice for many developers and enterprises. In the Spring ecosystem, SpringBoot and SpringMVC are two very important components. Although they are both based on the Spring framework, there are some differences in functions and usage. This article will focus on comparing SpringBoot and Spring

How to implement exact division operation in Golang Feb 20, 2024 pm 10:51 PM

Implementing exact division operations in Golang is a common need, especially in scenarios involving financial calculations or other scenarios that require high-precision calculations. Golang's built-in division operator "/" is calculated for floating point numbers, and sometimes there is a problem of precision loss. In order to solve this problem, we can use third-party libraries or custom functions to implement exact division operations. A common approach is to use the Rat type from the math/big package, which provides a representation of fractions and can be used to implement exact division operations.

Master how Golang enables game development possibilities Mar 16, 2024 pm 12:57 PM

In today's software development field, Golang (Go language), as an efficient, concise and highly concurrency programming language, is increasingly favored by developers. Its rich standard library and efficient concurrency features make it a high-profile choice in the field of game development. This article will explore how to use Golang for game development and demonstrate its powerful possibilities through specific code examples. 1. Golang’s advantages in game development. As a statically typed language, Golang is used in building large-scale game systems.

PHP Game Requirements Implementation Guide Mar 11, 2024 am 08:45 AM

PHP Game Requirements Implementation Guide With the popularity and development of the Internet, the web game market is becoming more and more popular. Many developers hope to use the PHP language to develop their own web games, and implementing game requirements is a key step. This article will introduce how to use PHP language to implement common game requirements and provide specific code examples. 1. Create game characters In web games, game characters are a very important element. We need to define the attributes of the game character, such as name, level, experience value, etc., and provide methods to operate these

What are the views in Word? Mar 19, 2024 pm 06:10 PM

I guess that many students want to learn the typesetting skills of Word, but the editor secretly tells you that before learning the typesetting skills, you need to understand the word views clearly. In Word2007, 5 views are provided for users to choose. These 5 views include pages. View, reading layout view, web layout view, outline view and normal view, let’s learn about these 5 word views with the editor today. 1. Page view Page view can display the appearance of the print result of the Word2007 document, which mainly includes headers, footers, graphic objects, column settings, page margins and other elements. It is the page view closest to the print result. 2. Reading layout view Reading layout view displays Word2007 documents and Office in the column style of a book

See all articles