What is the best way to fill in the jquery treeselect widget?

Question

What is the best way to fill in the jquery treeselect widget?

I'm struggling with populating the jquery treeselect widget using a json file or any other method. Since I am new to jquery/javascript, I'm sure I must be missing some basics.

Although I have obtained the plugin from https://github.com/travist/jquery.treeselect.js, I haven't been able to find an example on how to set it up.

<html>
<head>
    <script type='text/javascript' src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.js"></script>
    <script type='text/javascript' src='js/jquery.moreorless.js'></script>
    <script type='text/javascript' src='js/jquery.treeselect.js'></script>
    <script type='text/javascript' src='js/jquery.chosentree.js'></script>

    <link rel='stylesheet' type='text/css' href='css/moreorless.css'/>
    <link rel='stylesheet' type='text/css' href='css/treeselect.css'/>
    <link rel='stylesheet' type='text/css' href='css/chosen.css'/>
    <script type='text/javascript'>
        jQuery(function () {

            var data1 = ["EVENT1", "EVENT2"];
           var data2 = [{
                "id": 1,
                "name": "A green door"
            },
                {
                    "id": 2,
                    "name": "A blue door"
                }
            ]   

            $('div.chosentree').chosentree({
                width: 200,
                deepLoad: true,
                default_value: data2, // not functioning
                load: function (node, callback) {

                    // What should I include here?
                    /**
                     * Typically, this would involve calling jQuery.ajax to fetch a new node
                     * from your server which returns the tree structure for the specified node.
                     */
                }
            });
        });
    </script>
</head>
<body>
<div class="chosentree"></div>
</body>
</html>

javascript jquery html css json

Answer 1

Answer №1

If you are curious about how this functions, the best way to understand it is by examining the example files available in the repository located @ https://github.com/travist/jquery.treeselect.js/blob/master/treeselect.html. Within these files, you will come across the following code.

$('div.chosentree').chosentree({
  width: 500,
  deepLoad: true,
  showtree: true,
  load: function(node, callback) {
    setTimeout(function() {
      callback(loadChildren(node, 0));
    }, 1000);
  }
});

The snippet of code inside the load function performs a simulated request to demonstrate what the data might resemble. It achieves this by invoking a method named loadChildren that is outlined in the file accessible at https://github.com/travist/jquery.treeselect.js/blob/master/index.html, which reads as follows...

var maxDepth = 3;
var loadChildren = function(node, level) {
  var hasChildren = node.level < maxDepth;
  for (var i=0; i<8; i++) {
    var id = node.id + (i+1).toString();
    node.children.push({
      id:id,
      title:'Node ' + id,
      has_children:hasChildren,
      level: node.level + 1,
      children:[]
    });
    if (hasChildren && level < 2) {
      loadChildren(node.children[i], (level+1));
    }
  }

  return node;
};

It's crucial to grasp that this process imitates a server request. Essentially, it mimics sending a request to a server and receiving a response structured similarly to the one shown below.

{
  "id": "1",
  "title": "Node 1",
  "has_children": "1",
  "children": [
    {
      "id": "11",
      "title": "Node 11",
      "has_children": "1",
      "children": [

      ]
    },
    ...
    ...
  ]
}

By supplying a single node object to the load function, you can load all the descendants beneath that specific node if desired.

This explanation clears things up. Hope it aids your understanding.

Answer 2

If you are curious about how this functions, the best way to understand it is by examining the example files available in the repository located @ https://github.com/travist/jquery.treeselect.js/blob/master/treeselect.html. Within these files, you will come across the following code.

$('div.chosentree').chosentree({
  width: 500,
  deepLoad: true,
  showtree: true,
  load: function(node, callback) {
    setTimeout(function() {
      callback(loadChildren(node, 0));
    }, 1000);
  }
});

The snippet of code inside the load function performs a simulated request to demonstrate what the data might resemble. It achieves this by invoking a method named loadChildren that is outlined in the file accessible at https://github.com/travist/jquery.treeselect.js/blob/master/index.html, which reads as follows...

var maxDepth = 3;
var loadChildren = function(node, level) {
  var hasChildren = node.level < maxDepth;
  for (var i=0; i<8; i++) {
    var id = node.id + (i+1).toString();
    node.children.push({
      id:id,
      title:'Node ' + id,
      has_children:hasChildren,
      level: node.level + 1,
      children:[]
    });
    if (hasChildren && level < 2) {
      loadChildren(node.children[i], (level+1));
    }
  }

  return node;
};

It's crucial to grasp that this process imitates a server request. Essentially, it mimics sending a request to a server and receiving a response structured similarly to the one shown below.

{
  "id": "1",
  "title": "Node 1",
  "has_children": "1",
  "children": [
    {
      "id": "11",
      "title": "Node 11",
      "has_children": "1",
      "children": [

      ]
    },
    ...
    ...
  ]
}

By supplying a single node object to the load function, you can load all the descendants beneath that specific node if desired.

This explanation clears things up. Hope it aids your understanding.

Answer 3

Answer №2

After spending a couple of hours trying to figure out if raw JSON was compatible with my code, I realized that it does work. However, make sure to remember to run your string literal through JSON.parse(jsonString);

For example:

    jQuery(function() {
        JSONObject = JSON.parse('{"id":"01","title":"Node 01","has_children":true,"level":1,"children":[{"id":"011","title":"Node 011","has_children":true,"level":2,"children":[{"id":"0111","title":"Node 0111","has_children":false,"level":3,"children":[]}]}]}');

        $('div.chosentree').chosentree({
            width: 500,
            deepLoad: true,
            load: function(node, callback) {
                    callback(JSONObject);
            }
        });
    });

Answer 4

After spending a couple of hours trying to figure out if raw JSON was compatible with my code, I realized that it does work. However, make sure to remember to run your string literal through JSON.parse(jsonString);

For example:

    jQuery(function() {
        JSONObject = JSON.parse('{"id":"01","title":"Node 01","has_children":true,"level":1,"children":[{"id":"011","title":"Node 011","has_children":true,"level":2,"children":[{"id":"0111","title":"Node 0111","has_children":false,"level":3,"children":[]}]}]}');

        $('div.chosentree').chosentree({
            width: 500,
            deepLoad: true,
            load: function(node, callback) {
                    callback(JSONObject);
            }
        });
    });

What is the best way to fill in the jquery treeselect widget?

Answer №1

Answer №2

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