Read external Newick file about phylotree.js HOT 2 CLOSED

$("#newick_file").on ("change", function (e) {
    var files = e.target.files; // FileList object
    if (files.length == 1) {
      var f = files[0];
      var reader = new FileReader();
      reader.onload = (function(theFile) {
        return function(e) {
            var res = d3.layout.newick_parser (e.target.result);
            
            if (res["json"]) {
                if (!("children" in res["json"])) {
                    res["error"] = "Empty tree";
                } 
            }
            
            var warning_div = d3.select ("#main_display").insert ("div", ":first-child");
            if (res["error"]) {
                warning_div.attr ("class", "alert alert-danger alert-dismissable")
                            .html ("<strong>Newick parser error for file " + f.name +": </strong> In file " + res["error"]);
            } else {
                default_tree_settings ();
                tree (res).svg (svg).layout();
                warning_div.attr ("class", "alert alert-success alert-dismissable")
                            .html ("Loaded a tree from  file <strong>" + f.name +": </strong>");
            }          
            warning_div.append ("button")
                       .attr ("type", "button")
                       .attr ("class", "close")
                       .attr ("data-dismiss", "alert")
                       .attr ("aria-hidden", "true")
                       .html ("&times;");
        };
      })(f);
      reader.readAsText(f);
    }
});