Question

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"]
});

Answer 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.