SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by metalhaze

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">

JavaScript

var data = {
"actions" : [
    {
        "action": "TOP1",
        "subaction": [
            {
                "name": "A" 
            },
            {
                "name": "B" 
            },
            {
                "name": "C" 
            } 
        ] 
    },
    {
        "action": "TOP2",
        "subaction": [
            {
                "name": "X" 
            },
            {
                "name": "Y" 
            } 
        ]
    }]
};
$.each(data.actions, function(entryIndex, entry) {
  var html = '<li class="top-level">' + this.action + '</li>';
   $.each(this.subaction, function() { 
       alert(this.name); 
   }); 
});