How to implement node merging and splitting operations in mind maps using Vue and jsmind?

How to use Vue and jsmind to implement node merging and splitting operations in mind maps?

Mind map is a common tool for organizing and displaying information. It organizes and displays thoughts and opinions through nodes and connecting lines in a tree structure. In practical applications, sometimes we need to merge and split nodes in the mind map to better manage and display information. This article will introduce how to use Vue and jsmind libraries to implement node merging and splitting operations in mind maps, and give corresponding code examples.

First, we need to introduce the Vue and jsmind libraries. It can be introduced through CDN, or installed and introduced through npm. Next, we need to create a Vue component to host the mind map.

<template>
  <div id="jsmind-container"></div>
</template>

<script>
export default {
  mounted() {
    this.initMindMap();
  },
  methods: {
    initMindMap() {
      const options = {
        container: 'jsmind-container',
        editable: true,
        theme: 'primary'
        // 其他配置项
      };

      const mind = {
        meta: {
          name: '思维导图',
          author: 'Vue+jmind',
          version: '1.0'
        },
        format: 'free',
        data: [
          // 初始节点数据
        ],
      };

      this.mindMap = jsMind.show(options, mind);
    }
  }
}
</script>

<style>
#jsmind-container {
  width: 100%;
  height: 500px;
}
</style>

In the mounted hook function of the Vue component, we call the initMindMap method to initialize the mind map. First, we define an options object, in which the container attribute specifies the id of the container element of the mind map, and the editable attribute is set to trueIndicates that the mind map can be edited, and the theme attribute is set to 'primary' to specify the theme used. Next, we defined a mind object to set the initial mind map node data. This is just an empty data that needs to be filled according to the actual situation.

Next, we need to implement the node merging operation. In a mind map, we can reduce redundant information and the number of nodes by merging multiple adjacent nodes into one node. In the Vue component, we can add a button at the appropriate place to trigger the node merging operation.

<template>
  <div>
    <div id="jsmind-container"></div>
    <button @click="mergeNodes">合并节点</button>
  </div>
</template>

<script>
export default {
  methods: {
    mergeNodes() {
      const selectedNodes = this.mindMap.get_selected_node(); // 获取选中的节点
      const parent = selectedNodes[0].parent; // 获取选中节点的父节点

      // 获取选中节点的子节点
      const children = selectedNodes.map(node => {
        return {
          ...node,
          children: node.children
        };
      });

      // 创建新的节点
      const mergedNode = {
        id: 'newNode',
        topic: '合并节点',
        children: children
      };

      // 更新父节点的子节点数据
      const parentData = parent.data;
      const index = parentData.findIndex(node => node.id === selectedNodes[0].id);
      parentData.splice(index, 1, mergedNode);

      this.mindMap.update_node(parent, parentData); // 更新父节点数据
    }
  }
}
</script>

In the mergeNodes method, we first get the selected node through the this.mindMap.get_selected_node() method, and then through the parent attribute Get the parent node of this node. Next, we use the map method to convert the selected node into new node data and save the original child node data. Then, we create a new node and use the child nodes of the selected node as the child node attributes of the new node. Next, we update the parent node's child node data and use the this.mindMap.update_node method to update the parent node's data.

Similarly, we can implement node splitting operations. Split operation is the operation of splitting a node into multiple sub-nodes in order to display more detailed information.

<template>
  <div>
    <div id="jsmind-container"></div>
    <button @click="splitNode">拆分节点</button>
  </div>
</template>

<script>
export default {
  methods: {
    splitNode() {
      const selectedNode = this.mindMap.get_selected_node()[0]; // 获取选中的节点

      // 拆分节点为多个子节点
      const children = selectedNode.children.map((child, index) => {
        return {
          id: 'newNode_' + index,
          topic: child.topic
        };
      });

      // 更新选中节点的子节点数据
      this.mindMap.move_node(selectedNode, children);
    }
  }
}
</script>

In the splitNode method, we first get the selected node through the this.mindMap.get_selected_node() method, and then use the map method Convert the child nodes of the selected node into data of multiple child nodes. During the split operation, we only change the id and topic attributes of the child nodes and save them in a new array. Next, we use the this.mindMap.move_node method to replace the data of the selected node with the new child node data.

By implementing node merging and splitting operations, we can manage the information in the mind map more flexibly. The above code examples are implemented based on Vue and jsmind libraries. You can also implement similar functions in other frameworks and libraries according to your own needs. I hope this article will be helpful to your learning and development!

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