unload function

var _ids = [];


_ids.push(data.load("scene1"))
_ids.push(data.load("scene2"))
_ids.push(data.load("scene3"))


for (var ii = 0; ii < _ids.length; ii++)
    data.unload(_ids[ii]);

// init show/hide info layers button
function init_show_hide() {

var load_add_scene = document.getElementById("load_add_button");
var unload_add_scene = document.getElementById("unload_add_button");  
    
// this function loads an external .json file into the scene
load_add_scene.addEventListener("click", function(e) {
        m_data.load("Scene_Demo_Arrows.json", null, null, false, false);
    });
// this function SHOULD unload the external .json file from the scene this is where I need help... I would like to store the id of the previously loaded scene, and re-use this ID here.
unload_add_scene.addEventListener("click", function(e) {
        m_data.unload();
    });
}

function init_show_hide() {
    
    var load_add_scene = document.getElementById("load_add_button");
    var unload_add_scene = document.getElementById("unload_add_button");  
    
    // will keep loaded scene ID here
    var arrows_scene_id = 0;
    
    load_add_scene.addEventListener("click", function(e) {
        arrows_scene_id = m_data.load("Scene_Demo_Arrows.json", null, null, false, false);
    });

    unload_add_scene.addEventListener("click", function(e) {
        // check that the scene is loaded (0 unloads all scenes)
        if (arrows_scene_id != 0)
            m_data.unload(arrows_scene_id);
    });
}

load_add_scene.addEventListener("click", function(e) {
    // if not loaded load it now
    if (arrows_scene_id == 0)
        arrows_scene_id = m_data.load("Scene_Demo_Arrows.json", null, null, false, false);
});

unload_add_scene.addEventListener("click", function(e) {
    // check that the scene is loaded (0 unloads all scenes)
    if (arrows_scene_id != 0) {
        m_data.unload(arrows_scene_id);
        arrows_scene_id = 0;
    }
});