How can I tell if jsTree has fully loaded?

问题

I am trying to write a function that opens specific nodes on a jsTree but I am having a problem where the function is executed before my base tree is loaded from the ajax call. How can I tell if my jstree data has been loaded and wait until it is done loading. Below is the function I am trying to use.

function openNodes(tree, nodes) {
    for (i in nodes) {
        $('#navigation').jstree("open_node", $(nodes[i]));
    }
}

I am loading my initial tree with the following command

$("#navigation").jstree({
    "json_data": {
        "ajax": {
            "url": function(node) {
                var url;
                if (node == -1) {
                    url = "@Url.Action("BaseTreeItems", "Part")";
                } else {
                    url = node.attr('ajax');
                }
                return url;
            },
            "dataType": "text json",
            "contentType": "application/json charset=utf-8",
            "data": function(n) { return { id: n.attr ? n.attr("id") : 0, ajax: n.attr ? n.attr("ajax") : 0 }; },
            "success": function() {
            }
        }
    },
    "themes": { "theme": "classic" },
    "plugins": ["themes", "json_data", "ui"]
});

回答1:

I used setInterval and clearInterval:

var interval_id = setInterval(function(){
     // $("li#"+id).length will be zero until the node is loaded
     if($("li#"+id).length != 0){
         // "exit" the interval loop with clearInterval command
         clearInterval(interval_id)
         // since the node is loaded, now we can open it without an error
         $("#tree").jstree("open_node", $("li#"+id))
      }
}, 5);

JStree's ".loaded" callback only works for root nodes; "._is_loaded" may work instead of checking the node's length, but I haven't tried it. Either way, the animation settings cause nodes that are deeper in the tree to be loaded a few milliseconds later. The setInterval command creates a timed loop that exits when your desired node(s) is loaded.

回答2:

Before you call .jstree() on an element, you can bind your callbacks to before.jstree and loaded.jstree events:

$(selector)
.bind('before.jstree', function(e, data) {
    // invoked before jstree starts loading
})
.bind('loaded.jstree', function(e, data) {
    // invoked after jstree has loaded
    $(this).jstree("open_node", $(nodes[i]));
})
.jstree( ... )

回答3:

In the more recent versions of jstree, you may need to wait until all the nodes have finished loading before interacting with them. To do this you need:

ready.jstree

So:

$(selector)
    .bind('ready.jstree', function(e, data) {
        // invoked after jstree has loaded
     })
...

回答4:

You had better call $.ajax() function to get data you want at first, you can call $().jstree() function in the success: field like bellow my code.

    var fullTree;
$.ajax({
  url :"./php/select_tree.php",
  data : fullTree,
  method : "GET",
  dataType : "json",
  success : function(fullTree){
    $("#jstree").jstree({
      "core" : {
        "data" :fullTree,
        "check_callback" : true
       },
       "plugins" : [ "contextmenu", "dnd", "changed", "wholerow" ]
    });
  }
})
;

回答5:

I use refresh.jstree event in my case (I need to dynamically change and refresh the nodes in jstree very often).

According to the docoment, it

triggered when a refresh call completes

jsTree Doc (Events)

Sample code:

$.post( [url], ... ).done(function(){ $jstree.jstree().settings.core.data = result; $jstree.jstree().refresh(); }); $(selector).on('refresh.jstree', function(){ // do something });

回答6:

You don't have to add an interval. The plugin sets a class on the node that it's loading via ajax.

.one("reselect.jstree", function (evt, data) {
        if ($("#MYTREEID").find(".jstree-loading").length == 0) {
            alert('my ajax tree is done loading");
        }
    })

回答7:

[Disclaimer: this does not apply to the OP since the state plugin is not listed in the setup code.]

If you are using the state plugin, use the state_ready.jstree event instead of the ready.jstree or loaded.jstree events.

$(selector).on('state_ready.jstree', function () {
    // open desired node
})

来源：https://stackoverflow.com/questions/11452205/how-can-i-tell-if-jstree-has-fully-loaded