use native select folder dialog

static/js/selectFolder.js

@@ -0,0 +1,46 @@
+'use strict';
+
+oml.ui.selectFolder = function(options, self) {
+    options.width = options.width - options.labelWidth
+    options = Ox.extend({
+        title: '...',
+        textAlign: 'left'
+    }, options);
+    var $button = Ox.Button(options, self).bindEvent({
+            click: function(event) {
+                oml.api.selectFolder({
+                    base: $button.value()
+                }, function(result) {
+                    if (result.data.path) {
+                        $button.value(result.data.path);
+                        $button.options({
+                            title: result.data.path
+                        });
+                        $button.triggerEvent('change', result.data.path);
+                    }
+                })
+            }
+        }),
+        that = Ox.FormElementGroup({
+            id: options.id,
+            elements: [
+                Ox.Label({
+                    style: options.style,
+                    textAlign: 'right',
+                    overlap: 'right',
+                    title: options.label,
+                    width: options.labelWidth
+                }),
+                $button
+            ],
+        }, self);
+
+    that.value = function() {
+        return $button.value()
+    }
+
+    if (options.title && options.title != '...') {
+        $button.value(options.title)
+    }
+    return that;
+}