Tidy up the data browser javascript

[rails.git] / app / views / browse / start.rjs

diff --git a/app/views/browse/start.rjs b/app/views/browse/start.rjs
index 220295663f8c9753e083c3738e504ba05f0c9798..b96e8c39c6ecd1d29859123264f4fd1d559bb898 100644 (file)
--- a/app/views/browse/start.rjs
+++ b/app/views/browse/start.rjs
@@ -2,7 +2,6 @@ page.replace_html :sidebar_title, t('browse.start_rjs.data_frame_title')
 page.replace_html :sidebar_content, :partial => 'start'
 page << <<EOJ
   var browseBoxControl;
-  var browseActive;
   var browseMode = "auto";
   var browseBounds;
   var browseFeatureList;
@@ -10,12 +9,13 @@ page << <<EOJ
   var browseDataLayer;
   var browseSelectControl;
   var browseObjectList;
+  var areasHidden = false;
 
   OpenLayers.Feature.Vector.style['default'].strokeWidth = 3;
   OpenLayers.Feature.Vector.style['default'].cursor = "pointer";
     
   function startBrowse() {
-    browseActive = true;
+    map.dataLayer.active = true;
 
     openSidebar({ onclose: stopBrowse });
 
@@ -26,20 +26,24 @@ page << <<EOJ
         sides: 4,
         snapAngle: 90,
         irregular: true,
-        persist: true,
-        callbacks: { done: endDrag }
+        persist: true
       }
     });
+    browseBoxControl.handler.callbacks.done = endDrag;
     map.addControl(browseBoxControl);
 
     map.events.register("moveend", map, showData);
     map.events.triggerEvent("moveend");
+
+    $("browse_hide_areas_box").innerHTML = "#{I18n.t('browse.start_rjs.hide_areas')}";
+    $("browse_hide_areas_box").style.display = "inline";
+    $("browse_hide_areas_box").onclick = hideAreas;
   }
 
   function showData() {
     if (browseMode == "auto") {
       if (map.getZoom() >= 15) {
-          useMap();
+          useMap(false);
       } else {
           setStatus("#{I18n.t('browse.start_rjs.zoom_or_select')}");
       }    
@@ -47,8 +51,8 @@ page << <<EOJ
   }
 
   function stopBrowse() {
-    if (browseActive) {
-      browseActive = false;
+    if (map.dataLayer.active) {
+      map.dataLayer.active = false;
 
       if (browseSelectControl) {   
         browseSelectControl.destroy();  
@@ -57,7 +61,7 @@ page << <<EOJ
 
       if (browseBoxControl) {
        browseBoxControl.destroy();
-       browseBoxControl = null;
+        browseBoxControl = null;
       }                
 
       if (browseActiveFeature) {
@@ -85,7 +89,7 @@ page << <<EOJ
 
   $("browse_select_box").onclick = startDrag;
 
-  function useMap() {
+  function useMap(reload) {
     var bounds = map.getExtent();
     var projected = bounds.clone().transform(map.getProjectionObject(), epsg4326);
 
@@ -99,7 +103,7 @@ page << <<EOJ
                                              center.lat + (tileHeight / 2));
 
       browseBounds = tileBounds;
-      getData(tileBounds);
+      getData(tileBounds, reload);
 
       browseMode = "auto";
 
@@ -109,6 +113,26 @@ page << <<EOJ
     return false;
   }
 
+  function hideAreas() {
+      $("browse_hide_areas_box").innerHTML = "#{I18n.t('browse.start_rjs.show_areas')}";
+      $("browse_hide_areas_box").style.display = "inline";
+      $("browse_hide_areas_box").onclick = showAreas;
+
+      areasHidden = true;
+
+      useMap(true);
+  }
+
+  function showAreas() {
+      $("browse_hide_areas_box").innerHTML = "#{I18n.t('browse.start_rjs.hide_areas')}";
+      $("browse_hide_areas_box").style.display = "inline";
+      $("browse_hide_areas_box").onclick = hideAreas;
+
+      areasHidden = false;
+
+      useMap(true);
+  }
+
   $("browse_select_view").onclick = useMap;
 
   function endDrag(bbox) {
@@ -154,7 +178,7 @@ page << <<EOJ
   }    
 
   function customDataLoader(request) {
-    if (browseActive) {
+    if (this.map.dataLayer.active) {
       var doc = request.responseXML;
 
       if (!doc || !doc.documentElement) {
@@ -182,22 +206,29 @@ page << <<EOJ
     }
   }
 
-  function getData(bounds) {
+  function getData(bounds, reload) {
     var projected = bounds.clone().transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
     var size = projected.getWidth() * projected.getHeight();
 
-    if (size > #{APP_CONFIG['max_request_area']}) {
-      setStatus(i18n("#{I18n.t('browse.start_rjs.unable_to_load_size', :max_bbox_size => APP_CONFIG['max_request_area'])}", { bbox_size: size }));
+    if (size > #{MAX_REQUEST_AREA}) {
+      setStatus(i18n("#{I18n.t('browse.start_rjs.unable_to_load_size', :max_bbox_size => MAX_REQUEST_AREA)}", { bbox_size: size }));
     } else {
-      loadGML("/api/#{API_VERSION}/map?bbox=" + projected.toBBOX());
+      loadGML("/api/#{API_VERSION}/map?bbox=" + projected.toBBOX(), reload);
     }
   }
 
-  function loadGML(url) {
+  function loadGML(url, reload) {
     setStatus("#{I18n.t('browse.start_rjs.loading')}");
     $("browse_content").innerHTML = "";
 
-    if (!browseDataLayer) {
+    var formatOptions = {
+      checkTags: true,
+      interestingTagsExclude: ['source','source_ref','source:ref','history','attribution','created_by','tiger:county','tiger:tlid','tiger:upload_uuid']
+    };
+
+    if (areasHidden) formatOptions.areaTags = [];
+
+    if (!browseDataLayer || reload) {
       var style = new OpenLayers.Style();
 
       style.addRules([new OpenLayers.Rule({
@@ -208,12 +239,11 @@ page << <<EOJ
         }
       })]);
 
+      if (browseDataLayer) browseDataLayer.destroyFeatures();
+
       browseDataLayer = new OpenLayers.Layer.GML("Data", url, {
         format: OpenLayers.Format.OSM,
-        formatOptions: {
-          checkTags: true, 
-          interestingTagsExclude: ['source','source_ref','source:ref','history','attribution','created_by','tiger:county','tiger:tlid','tiger:upload_uuid']
-        },
+        formatOptions: formatOptions,
         maxFeatures: 100,
         requestSuccess: customDataLoader,
         displayInLayerSwitcher: false,
@@ -231,6 +261,8 @@ page << <<EOJ
       map.addControl(browseSelectControl);
       browseSelectControl.activate();
     } else {
+      browseDataLayer.destroyFeatures();
+      browseDataLayer.format(formatOptions);
       browseDataLayer.setUrl(url);
     }
 
@@ -238,9 +270,9 @@ page << <<EOJ
   }
 
   function dataLoaded() {
-    if (browseActive) {
+    if (this.map.dataLayer.active) {
       clearStatus();
-        
+
       browseObjectList = document.createElement("div")
 
       var heading = document.createElement("p");