How to implement the export and sharing functions of mind maps through Vue and jsmind?

How to export and share mind maps through Vue and jsMind?

Introduction

Mind map is a graphical tool used to display and organize information, which can help people better understand and remember complex concepts and relationships. Vue is a popular JavaScript framework for building user interfaces. jsMind is a JavaScript-based mind map library that provides functions for creating and operating mind maps. This article will use Vue and jsMind to implement the export and sharing functions of mind maps.

Installation and Configuration

First, we need to install Vue and jsMind. They can be installed via npm:

npm install vue jsmind

Then, we need to configure jsMind in the Vue project. Add the following code to the Vue entry file (for example, main.js):

import jsMind from 'jsmind'
import 'jsmind/style/jsmind.css'

Vue.prototype.$jsMind = jsMind

Create a mind map

In the Vue component, we can use jsMind to create a mind map. First, add a div element to the template file to accommodate the mind map:

<template>
  <div id="jsmind_container"></div>
</template>

Then, in the mounted life cycle hook function of the component, create the mind map:

<script>
export default {
  mounted() {
    const mind = {
      meta: {
        name: '思维导图',
      },
      format: 'node_tree',
      data: [
        {
          id: 'root',
          isroot: true,
          topic: '主题',
          children: [
            {
              id: 'node1',
              topic: '子节点1',
            },
            {
              id: 'node2',
              topic: '子节点2',
              children: [
                {
                  id: 'node3',
                  topic: '子节点3',
                },
              ],
            },
          ],
        },
      ],
    }

    const options = {
      container: 'jsmind_container',
      editable: true,
    }

    const jm = new this.$jsMind(options)
    jm.show(mind)
  },
}
</script>

In the above code, we first define a mind object, which is used to describe the structure of the mind map. Then, we created an options object to specify the container element of the mind map and whether it is editable. Finally, create a new jsMind instance by new this.$jsMind(options), and then use the show method to display the mind map.

Export mind map

Next, we will implement the export function of mind map. Mind maps can be exported to a variety of formats, such as images, text, or JSON. This article takes exporting as a picture as an example.

First, add an export button in the template:

<template>
  <div>
    <div id="jsmind_container"></div>
    <button @click="exportImage">导出为图片</button>
  </div>
</template>

Then, implement the export function in the component method:

methods: {
  exportImage() {
    const canvas = document.createElement('canvas')
    const ctx = canvas.getContext('2d')
    const domElement = document.getElementById('jsmind_container')
    const { width, height } = domElement.getBoundingClientRect()

    canvas.width = width * window.devicePixelRatio
    canvas.height = height * window.devicePixelRatio
    ctx.scale(window.devicePixelRatio, window.devicePixelRatio)

    ctx.fillStyle = 'white'
    ctx.fillRect(0, 0, canvas.width, canvas.height)

    ctx.drawImage(
      domElement,
      0,
      0,
      width * window.devicePixelRatio,
      height * window.devicePixelRatio
    )

    const link = document.createElement('a')
    link.href = canvas.toDataURL('image/png')
    link.download = '思维导图.png'
    link.click()
  },
},

In the above code, we first created an A new canvas element and obtains its 2D drawing context. Then, get the width and height of the mind map container element and set the actual width and height of the canvas based on the device pixel ratio. Next, we use the drawImage method of the drawing context to draw the mind map onto the canvas. Finally, create a download link and export the drawn canvas image to png format.

Share mind maps

In addition to exporting mind maps, we can also implement the sharing function of mind maps. You can share a mind map by generating a sharing link so that other users can view or edit the mind map.

First, add a sharing button in the template:

<template>
  <div>
    <div id="jsmind_container"></div>
    <button @click="exportImage">导出为图片</button>
    <button @click="shareMindMap">分享思维导图</button>
  </div>
</template>

Then, implement the sharing function in the component method:

methods: {
  shareMindMap() {
    const mindData = this.$jsMind.util.json.get_data(this.jm.mind)
    const shareUrl = 'http://example.com/mindmap?data=' + encodeURIComponent(JSON.stringify(mindData))
    window.open(shareUrl, '_blank')
  },
},

In the above code, we use the one provided by jsMind json.get_dataMethod to obtain mind map data. This data is then converted to a string and encoded using the encodeURIComponent method. Finally, splice the sharing link, pass the data as a parameter, and open the sharing link in a new window.

Summary

In this article, we introduced how to use Vue and jsMind to implement the export and sharing functions of mind maps. Through the export function, we can save the mind map as an image format. Through the sharing function, we can generate a sharing link so that other users can view or edit the mind map. I hope this article can help you understand and apply Vue and jsMind in mind mapping applications.

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