How to use Vue and jsmind to implement historical version control and undo/redo functions of mind maps?

How to use Vue and jsmind to implement historical version control and undo/redo functions of mind maps?

Introduction
Mind mapping is a popular knowledge mapping tool that can help us better organize and understand complex thinking relationships. When developing mind mapping applications based on Vue, it is very useful to implement historical version control and undo/redo functions. This article will introduce you how to use Vue and jsmind plug-ins to achieve these functions.

1. Installing dependencies
   First, we need to install the dependency packages of Vue and jsmind. You can use npm or yarn to complete the installation.

npm install vue jsmind

2. Create a Vue component
   Next, we need to create a Vue component to manage the mind map and its version history. In the component, we will use jsmind to render the mind map and use Vue's data binding to implement version control and undo/redo functionality. The following is a simple component example:

<template>
  <div>
    <div ref="jsmindContainer"></div>
    <button @click="undo">撤销</button>
    <button @click="redo">重做</button>
  </div>
</template>

<script>
import 'jsmind/style/jsmind.css'
import { jsMind } from 'jsmind'

export default {
  name: 'MindMap',
  data () {
    return {
      mindMap: null,
      history: [],
      current: -1
    }
  },
  mounted () {
    const options = {
      container: this.$refs.jsmindContainer,
      editable: true
    }
    this.mindMap = new jsMind(options)
    this.mindMap.set_data(this.history[this.current])
  },
  methods: {
    undo () {
      if (this.current > 0) {
        this.current--
        this.mindMap.set_data(this.history[this.current])
      }
    },
    redo () {
      if (this.current < this.history.length - 1) {
        this.current++
        this.mindMap.set_data(this.history[this.current])
      }
    },
    saveData () {
      const data = this.mindMap.get_data()
      this.history = this.history.slice(0, this.current + 1)
      this.history.push(data)
      this.current = this.history.length - 1
    }
  },
  watch: {
    mindMap: {
      handler: 'saveData',
      deep: true
    }
  }
}
</script>

In the above code, we introduced jsmind's style file and jsMind instance. In data, we define mindMap to manage mind maps, history to save version history, and current to represent the index of the current version.

In the mounted method of the component, we create a mind map instance through the constructor of jsMind and render it to the specified DOM node. In methods, we implemented two methods, undo and redo, to undo and redo the mind map version. In the saveData method, we save the current mind map data to history and update the current value.

Finally, in watch, we monitor changes in mindMap so that when the mind map data changes, we can call the saveData method to save it.

3. Using Components
   Now, we can use the component we created in our Vue application. Just add the MindMap component to your Vue app's template.

<template>
  <div>
    <MindMap />
  </div>
</template>

<script>
import MindMap from './MindMap.vue'

export default {
  name: 'App',
  components: {
    MindMap
  }
}
</script>

You can further expand this component according to your own needs, such as adding the display of historical versions, etc.

Summary
Using Vue and jsmind plug-ins, we can easily implement historical version control and undo/redo functions of mind maps. By monitoring mind map changes and saving the data, we can build a mind mapping application that is flexible and easy to use. Hope this article can be helpful to you!

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