What is the process of transforming a tree into a JSON object?

Question

What is the process of transforming a tree into a JSON object?

I have a tree structure that I need to convert into JSON format for use with a jquery option tree.

NodeId, Title, Level
1, cars, 0
2, boats, 0
3, oldtimer, 1
4, trucks, 1
5, heavytrucks, 4

The desired tree structure is as follows:

boats
cars
- oldtimer
- trucks
-- heavytrucks

Each item within the tree has an ID associated with it.

Can someone please advise on how I can efficiently convert this structure into JSON?

Below is an example of the expected output in the jquery option tree format:

var option_tree = {
    "Option 1": {
        "Suboption": 200
    },
    "Option 2": {
        "Suboption 2": {
            "Subsub 1": 201,
            "Subsub 2": 202
        },
        "Suboption 3": {
            "Subsub 3": 203,
            "Subsub 4": 204,
            "Subsub 5": 205
        }
    }
};

Please note that `Option 1` does not have its own ID, but rather child elements only.

javascript json tree

Answer 1

Answer №1

This code snippet is designed to transform your input data into a tree structure.

var lines = 
   ('1, cars, 0\n' +
    '2, boats, 0\n' +
    '3, oldtimer, 1\n' +
    '4, trucks, 1\n' +
    '5, heavytrucks, 4').split('\n');

var tree = [];
var lookup = {}; // create temporary variable

for (var i in lines) {
    var items = lines[i].split(', ');

    var obj = { id: items[0], parent_id: items[2], name: items[1], children: [] };
    lookup[obj.id] = obj;

    if (lookup[obj.parent_id]) {
        lookup[obj.parent_id].children.push(obj);
    } else {
        tree.push(obj);
    }
}

console.log(tree); // the resulting tree will be displayed

You can then navigate through your tree and customize its appearance as needed.

For instance, you can visualize it like this:

function walk(root, depth) {
    var s = ""; for (var i = 0; i < depth; i++) s += '-';
    console.log(s + ' ' + root.name);
    for (var child in root.children) {
        walk(root.children[child], depth+1);
    }
}

for (var child in tree)
    walk(tree[child], 1);

The output will resemble this hierarchical representation:

- cars
-- oldtimer
-- trucks
--- heavytrucks
- boats

You have the flexibility to convert the tree structure to suit your specific requirements.

function walk2(root, parent) {
    if (root.children.length == 0) {
        parent[root.name] = root.id;
    } else {
        parent[root.name] = {}
        for (var child in root.children) {
            walk2(root.children[child], parent[root.name]);
        }
    }
}

var tree2 = {};

for (var child in tree)
    walk2(tree[child], tree2);

console.log(tree2); // Is this the desired output?

Answer 2

This code snippet is designed to transform your input data into a tree structure.

var lines = 
   ('1, cars, 0\n' +
    '2, boats, 0\n' +
    '3, oldtimer, 1\n' +
    '4, trucks, 1\n' +
    '5, heavytrucks, 4').split('\n');

var tree = [];
var lookup = {}; // create temporary variable

for (var i in lines) {
    var items = lines[i].split(', ');

    var obj = { id: items[0], parent_id: items[2], name: items[1], children: [] };
    lookup[obj.id] = obj;

    if (lookup[obj.parent_id]) {
        lookup[obj.parent_id].children.push(obj);
    } else {
        tree.push(obj);
    }
}

console.log(tree); // the resulting tree will be displayed

You can then navigate through your tree and customize its appearance as needed.

For instance, you can visualize it like this:

function walk(root, depth) {
    var s = ""; for (var i = 0; i < depth; i++) s += '-';
    console.log(s + ' ' + root.name);
    for (var child in root.children) {
        walk(root.children[child], depth+1);
    }
}

for (var child in tree)
    walk(tree[child], 1);

The output will resemble this hierarchical representation:

- cars
-- oldtimer
-- trucks
--- heavytrucks
- boats

You have the flexibility to convert the tree structure to suit your specific requirements.

function walk2(root, parent) {
    if (root.children.length == 0) {
        parent[root.name] = root.id;
    } else {
        parent[root.name] = {}
        for (var child in root.children) {
            walk2(root.children[child], parent[root.name]);
        }
    }
}

var tree2 = {};

for (var child in tree)
    walk2(tree[child], tree2);

console.log(tree2); // Is this the desired output?

What is the process of transforming a tree into a JSON object?

Answer №1

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