How to use recursive tree data to find object methods in Vue

In Vue.js development, it is often necessary to use recursive tree data to display views. In this process, we may need to find specific node objects and perform corresponding operations. This article will introduce a method of using recursion for tree data search to meet this need.

1. Data structure

Before we start to introduce the method, let us first take a look at the common tree data structure:

{
  "label": "Node 1",
  "children": [
    {
      "label": "Node 1-1",
      "children": []
    },
    {
      "label": "Node 1-2",
      "children": [
        {
          "label": "Node 1-2-1",
          "children": []
        }
      ]
    }
  ]
},
{
  "label": "Node 2",
  "children": []
}

The above data structure represents a simple two-dimensional A layer-nested tree structure, which contains a root node and several child nodes.

2. Search method

We hope to find node objects that meet the conditions in the tree structure through specific rules. The specific search method is as follows:

First, we need to define a method that accepts two parameters. The first parameter is the tree structure data to be searched; the second parameter is an object, indicating the search conditions of. The format of this object is as follows:

{
  key: "label",
  value: "Node 1-2-1"
}

Among them, key represents the attribute name to be matched, and value represents the attribute value to be matched.

Then, we can use recursion to traverse all nodes and find nodes that meet the conditions. The specific implementation method is as follows:

findByCondition(data, condition) {
  let result = null;
  data.forEach(node => {
    if (node[condition.key] === condition.value) {
      result = node;
    } else if (node.children) {
      result = this.findByCondition(node.children, condition);
    }
    if (result) {
      return;
    }
  });
  return result;
},

The recursive implementation method is to continuously traverse each node. If the current node meets the conditions, then return the current node, otherwise continue to recursively search for child nodes.

3. Usage Example

Next, let’s look at a usage example to find the label value in the data structure for Node 1-2-1 node as an example:

let data = [
  {
    "label": "Node 1",
    "children": [
      {
        "label": "Node 1-1",
        "children": []
      },
      {
        "label": "Node 1-2",
        "children": [
          {
            "label": "Node 1-2-1",
            "children": []
          }
        ]
      }
    ]
  },
  {
    "label": "Node 2",
    "children": []
  }
];

let condition = {
  key: "label",
  value: "Node 1-2-1"
};

let result = this.findByCondition(data, condition);
console.log(result);

The following information will be printed in the console:

{
  "label": "Node 1-2-1",
  "children": []
}

4. Summary

Through the above example, we can see that using recursion The tree data search object method can very conveniently implement the search operation of the tree structure. At the same time, in practical applications, we can also modify this method according to our own needs to meet different search needs.

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