Creation of jstree data from java for a given folder x levels down

Question

Given a folder I would like to construct tree of children down to x levels and render as jstrees html format (i.e ul, li so on) https://www.jstree.com/docs/html/ so that server files can be viewed remotely over webbrowser.

What is the best way to do this ?

Has anyone created a lib tieing java and jstree to do it, seems I cant be the first person to want to do this.

Answer 1

first, I'd like to point out that jsTree also accepts JSON as data input and not only raw html(https://www.jstree.com/docs/json/)

It looks like this:

// 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
}

To produce such a JSON format (or the equivalent in HTML form) can be done fairly easely using a recursive function. Here would be the pseudo-code:

class Node {
  String id;
  String text;
  // ...
  List<Node> children;
}

class Filesystem {

   Node browse(File path, int depth) {
       Node node = new Node(file);
       if( depth > 0 ) {
          for(File f : file.listFiles()) {
             Node child = browse(f, depth - 1);
             node.children.add(child);
          }
       }
       return node;
   }
}

It's not a copy-paste solution, but it should fairly straighforward to obtain one.