How to associate a data to a node in jstree?

$("#ifTree").jstree({
            "plugins" : ["themes","html_data","ui","crrm"], 
            "themes" : {
                    "theme" : "apple",
                    "dots" : true,
                    "icons" : false
            }           
    });

    $("#createIf_c").click(function () { 
        $("#ifTree").jstree("create",null,"inside",  { "data" :{ title:"if",value:"expression"} },
                function() {}, true);
    });
$("#display").click(function(){
            var a = $.jstree._focused().get_selected();
            alert(a.attr("value"));
    });

In this above code I have created a jstree and upon click of a button with id #createIf_c I am adding a node with title "if" but as I want some more data to be associated with this node , I have added more attributes to it while creating the node. Next when I am trying to access this associated data, here "value" then I am getting the alert 'undefined'. So is there a different way for associating data with a node? or a different way of accessing the associated data of a node is jstree?..please help....

mohammed barqawi

you can put your extra data in the JSON node.data this is not documented

Plz refer to the Author's answer.

You could edit info by $('#tree').jstree(true).get_node("some_node_id"), and post the extra data as json by $('#tree').jstree(true).get_json("some_node_id").

You can add anything you want to the data object. Like:
{ "id" : "some_node_id" "text" : "some node", ... "data" : { "foo" : "bar", "example_array" : ["1",2,true], "obj" : {"asdf":"asdf1"}  } ...

And later on you can retrieve it like so:
$('#tree').jstree(true).get_node("some_node_id").data.obj.asdf; // this would equal "asdf1"
$('#tree').jstree(true).get_node("some_node_id").data.example_array; // this would be an array: ["1",2,true]

Setting other values is just as simple - you are working with a normal object:
$('#tree').jstree(true).get_node("some_node_id").data.obj.asdf = "some other value";
$('#tree').jstree(true).get_node("some_node_id").data.example_array = "I do not want this an array anymore";
$('#tree').jstree(true).get_node("some_node_id").data.obj.new_property = 1024;

The simplest way to do this is just like adding an attribute to an html element i.e.,

    var node = $.jstree._focused().get_selected(); //get the selected node or which ever you want the data to be associated with
    node.attr("expression","xyz"); //add an attribute (name,value) here, name-expression and value-xyz

Proper way to associate a data to node is as follows:

If you are adding more data i.e. attribute then mentioned all attributes (name, value) under "attr" property

"attr":{ attributeName1:"attributeValue1", attributeName2:"attributeValue2"...... }

 $("#createIf_c").click(function () { 
 $("#ifTree").jstree("create",null,"inside",
   { "data" : "testNodeName", 
      "attr": { title:"if",value:"expression"} },  function() {}, true);
});

Using jstree v3, you can associate attributes using the plugin like so:-

// create instance
var inst = $("#tree-id").jstree();
// create node definition
var node = {
    id: "new_node_id",
    text: "New Node",
    li_attr: { "data-files": "false" },
    a_attr: { "data-url": "some_url" }
};
// create node
var newNodeId = inst.create_node("#", node);

The expected format of the node parameter (from the source comments):

// Expected format of the node (there are no required fields)
//{
//  id: "string" // will be autogenerated if omitted
//  text: "string" // node text
//  icon: "string" // string for custom
//  state: {
//      opened: boolean  // is the node open
//      disabled: boolean  // is the node disabled
//      selected: boolean  // is the node selected
//  },
//  children: []  // array of strings or objects
//  li_attr: { }  // attributes for the generated LI node
//  a_attr: { }  // attributes for the generated A node
//}

and the expected format of the create_node parameters:

// create_node(par, node, pos, callback, is_loaded)

// par (object) - the parent node (to create a root node use "#" (string) or `null`)
// node (object) - the data for new node (valid JSON object, or a simple string with the name)
// pos (object) - index to insert the node, "first" and "last" are supported, default is "last"
// callback (function) - a function to be called once the node is created
// is_loaded (boolean) - internal argument indicating if the parent node was succesfully loaded

// returns (string) - the ID of the newly create node

To associate data from HTML definition:

If you want to associate data using HTML definition of the tree, use:

<li id="treesiteadmin-serverStatus" data-ic='{"form":"site.serverstatus"}' data-jstree='{"icon":"glyphicons glyphicons-server"}'>Stato del server</li>

The "data" property of currently selected node will be:

{"jstree":{"icon":"glyphicons glyphicons-server"},"ic":{"form":"site.serverstatus"}}

See result - "data" property of selected node

div id="tree_1" class="tree-demo">
    <ul>
        <li data-jstree='{ "opened" : false }' id="c67"> Sıcak İçecekler
            <ul>
                <li data-jstree='{ "type" : "file", "selected" : false }' id="500">Çay</li>
                <li data-jstree='{ "type" : "file", "selected" : false }' id="501">Fincan Çay</li>

            </ul>
        </li>
        <li data-jstree='{ "opened" : true }' id="c68"> Soğuk İçecekler
            <ul>
                <li data-jstree='{ "type" : "file", "selected" : true }' id="514">Ayran</li>
                <li data-jstree='{ "type" : "file", "selected" : true }' id="515">Kola</li>
                <li data-jstree='{ "type" : "file", "selected" : true }' id="516">Meyveli Gazoz</li>                    
            </ul>
        </li>
    </ul>
</div>

this html is very suitable for custom ids if you want to solve it by <ul> and <li> elements.

来源：https://stackoverflow.com/questions/10030279/how-to-associate-a-data-to-a-node-in-jstree

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