Keep zoom level and bounds between pages

git-svn-id: http://www.peacefrogs.net/svn/chimere/trunk@13 9215b0d5-fb2c-4bbd-8d3e-bd2e9090e864

1 files changed, 32 insertions, 0 deletions

diff --git a/static/base.js b/static/base.js
new file mode 100644
index 0000000..19b3945
--- /dev/null
+++ b/static/base.js
@@ -0,0 +1,32 @@
+
+function saveExtent() {
+    /* save the current extent in a cookie */
+    if(!map) return;
+    document.cookie = "MAP_EXTENT=" + map.getExtent().toArray().join('_')
+                      + ';path="/"';
+}
+
+function getExtent() {
+    /* get the current extent from a cookie */
+    var cookies = document.cookie.split(';');
+    var map_extent;
+    for (i in cookies){
+        var items = cookies[i].split('=');
+        if (items[0] == 'MAP_EXTENT') map_extent = items[1].split('_');
+    }
+    return map_extent;
+}
+
+function zoomToCurrentExtent(map){
+    /* zoom to current extent */
+    var current_extent = getExtent();
+    if (OpenLayers && current_extent && current_extent.length == 4){
+        extent = new OpenLayers.Bounds(current_extent[0], current_extent[1],
+                                       current_extent[2], current_extent[3]);
+        map.zoomToExtent(extent, true);
+        return true;
+    }
+    else{
+        return;
+    }
+}
\ No newline at end of file