var ajaxreq = false, ajaxCallback;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//NAME: ajaxRequest()
//PURPOSE: 
//ARG: 
//RET: 
//NOTE:
//DLM:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function ajaxRequest(filename) {

    try {

        ajaxreq = new XMLHttpRequest();

    } catch (error) {

    try {

        ajaxreq = new ActiveXObject("Microsoft.XMLHTTP");

    } catch (error) {

      return false;

    }

    }

    ajaxreq.open("GET",filename);
    ajaxreq.onreadystatechange = ajaxResponse;
    ajaxreq.send(null);

}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//NAME: ajaxResponse()
//PURPOSE: 
//ARG: 
//RET: 
//NOTE:
//DLM:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function ajaxResponse() {

   if (ajaxreq.readyState != 4) return;
   if (ajaxreq.status == 200) {

   if (ajaxCallback) ajaxCallback();

   } else alert("Request failed: " + ajaxreq.statusText);

   return true;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//NAME: js_getLayerSelect()
//PURPOSE: update property location form
//ARG: layer, unit_id
//RET: 
//NOTE:
//DLM:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function js_getLayerSelect(layer, unit_id) {

var parent_id = (layer * 1) - 1;

if (unit_id == 0) {

   var selection = document.getElementById("layer" + parent_id + "_select").selectedIndex;
   var id = document.getElementById("layer" + parent_id + "_select").options[selection].value;

} else {

   id = unit_id;

}

if (unit_id != 0) {

   var options = document.getElementById("layer" + parent_id + "_select").options;

   for (x=0;x<options.length;x++) {
       
    
       if (document.getElementById("layer" + parent_id + "_select").options[x].value == unit_id) {

          document.getElementById("layer" + parent_id + "_select").options[x].selected = true;

       }

   }

}

filename = "index.php?group=vendor&class=ajax&task=get_layer_units&layer_id=" + layer + "&id=" + id;

ajaxCallback = js_displayLayerSelect;

ajaxRequest(filename);



}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//NAME: js_displayLayerForm()
//PURPOSE: display layer index dialogue
//ARG: 
//RET: 
//NOTE:
//DLM:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function js_displayLayerForm() {

var unitsblock = document.getElementById("location_units_block");
var layer1_select = document.getElementById("layer1_select");
var formblock = document.getElementById("location_form_block");
var newlocation = document.getElementById("newlocation");

layer1_select.options[0].value = '';
unitsblock.style.display = 'none';
formblock.style.display = 'block';
newlocation.value = 1;

document.getElementById("actual_address_textarea_block").style.display = 'none';

}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//NAME: js_resetLayerForm()
//PURPOSE: reset entire property location form
//ARG: 
//RET: 
//NOTE:
//DLM:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function js_resetLayerForm() {

document.getElementById("actual_address_textarea_block").style.display = 'none';

var tbody = document.getElementById("layers_admin_table_body");

for (x=2;x<8;x++) {

    var layer_tbody_row = document.getElementById("layer" + x + "_tbody_row");
    if (layer_tbody_row) tbody.removeChild(layer_tbody_row);

}

var primary_select = document.getElementById("layer1_select");
primary_select.options[0].selected = true;

}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//NAME: js_displayLayerSelect()
//PURPOSE: update property location form
//ARG: 
//RET: 
//NOTE:
//DLM:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function js_displayLayerSelect() {

var layer_form_div = document.getElementById("layer_form");

level = ajaxreq.responseXML.getElementsByTagName("level");
level_id = level[0].childNodes[0].nodeValue * 1;
parent_level_id = (level[0].childNodes[0].nodeValue * 1) - 1;
grand_parent_level_id = (level[0].childNodes[0].nodeValue * 1) - 2;
child_level_id = (level[0].childNodes[0].nodeValue * 1) + 1;

var tbody = document.getElementById("layers_admin_table_body");

//This section removes inferior elements when the user moves back up the layer hierarchy
for (x=level_id;x<8;x++) {

    var layer_tbody_row = document.getElementById("layer" + x + "_tbody_row");
    if (layer_tbody_row) tbody.removeChild(layer_tbody_row);

}

layer_unit_ids = ajaxreq.responseXML.getElementsByTagName("id");
layer_unit_names = ajaxreq.responseXML.getElementsByTagName("name");

if (layer_unit_ids.length > 0 && level[0].childNodes[0].nodeValue < 8) {

    //GET RID OF ADDRESS BOX IF PREVIOUSLY DISPLAYED
    document.getElementById("actual_address_textarea_block").style.display = 'none';

    var layer_span = document.createElement("SPAN");
    layer_span.id = "layer" + level[0].childNodes[0].nodeValue + "_span";
    layer_span.setAttribute("class","layer_span");
    layer_span.setAttribute("className","layer_span");

    //var layer_span_text = document.createTextNode("Layer " + level[0].childNodes[0].nodeValue);
    //var layer_span_text_br = document.createElement("BR");

    var layer_select = document.createElement("SELECT");
    layer_select.name = "layer" + level[0].childNodes[0].nodeValue + "_id";
    layer_select.id = "layer" + level[0].childNodes[0].nodeValue + "_select";
    layer_select.onchange = new Function("js_getLayerSelect(" + child_level_id + ",0)");

    var layer_select_choose_option = document.createElement("OPTION");
    layer_select_choose_option.text = "Please choose";
    layer_select_choose_option.value = '';

    if (navigator.appName == 'Microsoft Internet Explorer') layer_select.add(layer_select_choose_option);
    if (navigator.appName == 'Netscape') layer_select.add(layer_select_choose_option,null);

    var layer_select_nl_option = document.createElement("OPTION");
    layer_select_nl_option.text = "Not listed";
    layer_select_nl_option.value = '0';

    if (navigator.appName == 'Microsoft Internet Explorer') layer_select.add(layer_select_nl_option);
    if (navigator.appName == 'Netscape') layer_select.add(layer_select_nl_option,null);

    for (i=0;i<layer_unit_ids.length;i++) {

      var layer_unit_id = layer_unit_ids[i].childNodes[0].nodeValue;
      var layer_unit_name = layer_unit_names[i].childNodes[0].nodeValue;

      var layer_select_option = document.createElement("OPTION");
      layer_select_option.id = "option" + layer_unit_id;
      layer_select_option.text = layer_unit_name
      layer_select_option.value = layer_unit_id

      if (navigator.appName == 'Microsoft Internet Explorer') layer_select.add(layer_select_option);
      if (navigator.appName == 'Netscape') layer_select.add(layer_select_option,null);

   }

   //CREATE BR AFTER SELECT
   var layer_select_br = document.createElement("BR");
   layer_select_br.id = "layer" + level[0].childNodes[0].nodeValue + "_br";

   //BUILD
   layer_span.appendChild(layer_select);
  
   //THIS SECTION CREATES A NEW ROW AND 1 COLUMN
   var tbody_row = document.createElement("TR");
   tbody_row.id = "layer" + level[0].childNodes[0].nodeValue + "_tbody_row";

   var tbody_row_select_td = document.createElement("TD");
   tbody_row_select_td.id = "layer" + level[0].childNodes[0].nodeValue + "_select_td";
   tbody_row_select_td.setAttribute("class","layer_admin_select_td");
   tbody_row_select_td.setAttribute("className","layer_admin_select_td");
   
   //TABLE BUILD
   tbody_row_select_td.appendChild(layer_span);
   tbody_row.appendChild(tbody_row_select_td);
   tbody.appendChild(tbody_row);

} else {

  //ID NOT LISTED IS SELECTED OR NO UNITS EXIST, ASK FOR ADDRESS, DISPLAY GOOGLE MAP
  document.getElementById("actual_address_textarea_block").style.display = 'block';
  formmap_initialize(0,0);
  document.getElementById('vendor_form_map').style.display='block';

}

}