How to implement mind mapping in Javascript

With the rapid development of the Internet, we need to organize a large amount of knowledge points and information in our daily work and study. Brain maps have become a popular way of organizing information. Brain maps can clearly express knowledge structures and facilitate management and memory. As one of the most popular programming languages ​​at present, Javascript can also implement the function of brain mapping very well. Let’s introduce the method of implementing brain mapping in Javascript.

What is a brain map

The essence of a brain map is a graphical tree structure. Early brain maps were usually drawn by hand on a piece of paper. Later, with the continuous development of computer technology, some tools similar to mind mapping software appeared, making mind map creation more convenient and faster. Now with the continuous upgrading of Javascript technology, we can also use Javascript to realize visual brain maps.

The brain map consists of root node, parent node, child node and branch. The root node is usually the center of the entire brain map. Different parent nodes and child nodes extend in different directions from the central node, and the relationships between nodes are presented through branches. In the actual use of brain maps, we can set different topics, knowledge points or tasks as different nodes, and represent the interrelationships between them through links between nodes.

Javascript library to implement mind mapping

Before implementing mind mapping, we need to choose a suitable Javascript library. There are many popular mind map implementation libraries at present, including:

• MindMapJS: a lightweight mind map based on jQuery that can be used for free.
• jsMind: An open source pure Javascript mind mapping solution, released under the MIT license.
• MindMup: An extensible mind map editor based on HTML5 Canvas, free to use.
• D3.js: A data-driven visualization library that supports multiple visualization methods such as charts, tree diagrams, and brain maps.

The above libraries can all implement the core functions of mind mapping, but each has its own characteristics. We can choose the appropriate library based on actual needs.

Specific steps to implement brain maps in Javascript

After selecting the library to implement brain maps, the next step is the specific implementation steps:

Step 1: Generate nodes

First, we need to generate the root node and initial node. The root node is usually the center of the entire mind map, with parent nodes and child nodes added around it. The initial nodes can be a number of nodes representing different topics or tasks. Generating nodes can be achieved by configuring parameters.

var options = {
  container: 'map_container',
  root: {
    text: '中心节点'
  },
  formatNode: function(node) {
    return {
      id: node.id,
      text: node.text,
      parent: node.parentId
    }
  }
}

var mindmap = new Mindmap(options);
mindmap.insertNode({
  id: 'n1',
  parentId: null,
  text: '初始节点'
});

Step 2: Set node attributes

Node attributes can be achieved by setting styles. Node styles include color, border, font, etc.

mindmap.setNodeColor('n1', '#6EAC42');
mindmap.setNodeBorder('n1', 'solid', '#aaaaaa', '3px');
mindmap.setFont('n1', '21px', '微软雅黑', '#ffffff');

Step 3: Create the relationship between nodes

The relationship between nodes in the brain map is usually achieved by controlling the position and length of the branches. Relationships between nodes can be created by setting the length and style of branches.

mindmap.setLineWidth(2);
mindmap.setLineColor('#6EAC42');
mindmap.setLineType('curve');
mindmap.setRootLineColor('#aaaaaa');
mindmap.setRootLineType('solid');

Step 4: Bind events

Bind events to nodes to enable drag, delete, edit and other functions. There are two ways to bind events: by configuring parameters and adding an event processing function on a node; the other is by binding events of the entire brain map.

mindmap.on('clickNode', function(node) {
  console.log('点击了' + node.text + '节点');
});

mindmap.on('dragNode', function(node) {
  console.log('拖动了' + node.text + '节点');
});

Step 5: Save and Export

After the editing of the brain map is completed, we can save it locally or online. When exporting, you can save the brain map as a picture or generate the corresponding HTML code.

mindmap.save();
mindmap.exportImage('my-mind-map.png');
mindmap.exportHtml('my-mind-map.html');

Conclusion

Through the above introduction, we can see that Javascript can implement the function of brain mapping very well. The advantages of using Javascript to implement mind mapping are that it is lightweight, easy to use and has good scalability. However, when using Javascript to implement mind maps, you must also pay attention to compatibility and performance issues, and try to use lightweight libraries to reduce code complexity and redundancy.

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