omegarekrut,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
#test a + ul {
display: none;
}
#test a.open + ul {
display: block;
}
#test a{
cursor: pointer;
display: inline-block;
}
#test a.dd:after{
content: "+";
margin-left: 4px;
}
#test a.dd.open:after{
content: "-";
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(function() {
$.getJSON('https://api.myjson.com/bins/zlxnt', function(data) {
data.forEach(function(el, i) {
var parentId = el.PARENT;
var parent = document.querySelector("#_"+parentId);
if(!parent) {
parent = document.querySelector("#test");
}
else $(parent).prev().addClass("dd");
var li = $("<li>").appendTo(parent);
$("<a>", {text : el.NAME}).appendTo(li);
$("<ul>", {id : "_"+parentId}).appendTo(li);
})
})
$("#test").on("click", "a", function(event) {
event.preventDefault();
this.classList.toggle("open")
})
});
</script>
</head>
<body>
<ul id="test"></ul>
</body>
</html>