diff --git a/seahub/views/ajax.py b/seahub/views/ajax.py
index 302aec781b..a91be5fe06 100644
--- a/seahub/views/ajax.py
+++ b/seahub/views/ajax.py
@@ -2426,7 +2426,7 @@ def set_group_folder_perm(request, repo_id):
     content_type = 'application/json; charset=utf-8'
 
     if not (is_pro_version() and ENABLE_FOLDER_PERM):
-        return HttpResponse(json.dumps({"error": True}),
+        return HttpResponse(json.dumps({"error": _(u"Permission denied")}),
                             status=403, content_type=content_type)
 
     group_id = request.POST.get('group_id', None)
diff --git a/static/scripts/app/views/folder-perm.js b/static/scripts/app/views/folder-perm.js
index 712acad6b0..9693e1aca8 100644
--- a/static/scripts/app/views/folder-perm.js
+++ b/static/scripts/app/views/folder-perm.js
@@ -89,34 +89,7 @@ define([
             });
 
             // use select2 to 'user' input in 'add user perm'
-            $('[name="email"]', $add_user_perm).select2({
-                placeholder: gettext("Enter emails or select contacts"),
-                tags: function () {
-                    var contacts = app.pageOptions.contacts || [];
-                    var contact_list = [];
-                    for (var i = 0, len = contacts.length; i < len; i++) {
-                        contact_list.push({ // 'id' & 'text' are required by the plugin
-                            "id": contacts[i].email,
-                            "text": contacts[i].email,
-                            "avatar": contacts[i].avatar,
-                            "name": contacts[i].name
-                        });
-                    }
-                    return contact_list;
-                },
-                tokenSeparators: [',', ' '],
-                formatResult: function(item) { // format items shown in the drop-down menu
-                    if (item.avatar) {
-                        return item.avatar + '<span class="text">' + item.name + '<br />' + item.text + '</span>';
-                    } else {
-                        return; // if no match, show nothing
-                    }
-                },
-                formatSelection: function(item) { // format selected item shown in the input
-                    return item.name || item.text; // if no name, show the email, i.e., when directly input, show the email
-                },
-                escapeMarkup: function(m) { return m; }
-            });
+            $('[name="email"]', $add_user_perm).select2(Common.contactInputOptionsForSelect2);
 
             // use select2 to 'group' input in 'add group perm'
             var groups = app.pageOptions.groups || [],
diff --git a/static/scripts/app/views/share.js b/static/scripts/app/views/share.js
index fa8efd06be..386338847f 100644
--- a/static/scripts/app/views/share.js
+++ b/static/scripts/app/views/share.js
@@ -405,43 +405,12 @@ define([
         },
 
         filePrivateSharePanelInit: function() {
-            var loading_tip = this.$('.loading-tip');
             var form = this.$('#file-private-share-form');
-            loading_tip.show();
 
-            $('[name="emails"]', form).select2({
-                placeholder: gettext("Enter emails or select contacts"),
-                width: '400px',
-                // with 'tags', the user can directly enter, not just select
-                // tags need `<input type="hidden" />`, not `<select>`
-                tags: function () {
-                    var contacts = app.pageOptions.contacts || [];
-                    var contact_list = [];
-                    for (var i = 0, len = contacts.length; i < len; i++) {
-                        contact_list.push({ // 'id' & 'text' are required by the plugin
-                            "id": contacts[i].email,
-                            "text": contacts[i].email,
-                            "avatar": contacts[i].avatar,
-                            "name": contacts[i].name
-                        });
-                    }
-                    return contact_list;
-                },
-                formatResult: function(item) { // format items shown in the drop-down menu
-                    if (item.avatar) {
-                        return item.avatar + '<span class="text">' + item.name + '<br />' + item.text + '</span>';
-                    } else {
-                        return; // if no match, show nothing
-                    }
-                },
-                formatSelection: function(item) { // format selected item shown in the input
-                    return item.name || item.text; // if no name, show the email, i.e., when directly input, show the email
-                },
-                tokenSeparators: [',', ' '],
-                escapeMarkup: function(m) { return m; }
-            });
+            $('[name="emails"]', form).select2($.extend({
+                width: '400px'
+            },Common.contactInputOptionsForSelect2));
            
-            loading_tip.hide(); 
             form.removeClass('hide');
         },
 
@@ -485,40 +454,11 @@ define([
 
         dirPrivateSharePanelInit: function() {
             // no 'share to all'
-            var loading_tip = this.$('.loading-tip');
             var form = this.$('#dir-private-share-form');
-            loading_tip.show();
 
-            var contacts = app.pageOptions.contacts || [];
-            $('[name="emails"]', form).select2({
-                placeholder: gettext("Select contacts or input"),
-                width: '400px',
-                tags: function () {
-                    var contacts = app.pageOptions.contacts || [];
-                    var contact_list = [];
-                    for (var i = 0, len = contacts.length; i < len; i++) {
-                        contact_list.push({ // 'id' & 'text' are required by the plugin
-                            "id": contacts[i].email,
-                            "text": contacts[i].email,
-                            "avatar": contacts[i].avatar,
-                            "name": contacts[i].name
-                        });
-                    }
-                    return contact_list;
-                },
-                formatResult: function(item) { // format items shown in the drop-down menu
-                    if (item.avatar) {
-                        return item.avatar + '<span class="text">' + item.name + '<br />' + item.text + '</span>';
-                    } else {
-                        return; // if no match, show nothing
-                    }
-                },
-                formatSelection: function(item) { // format selected item shown in the input
-                    return item.name || item.text; // if no name, show the email, i.e., when directly input, show the email
-                },
-                tokenSeparators: [',', ' '],
-                escapeMarkup: function(m) { return m; }
-            });
+            $('[name="emails"]', form).select2($.extend({
+                width: '400px'
+            },Common.contactInputOptionsForSelect2));
            
             var groups = app.pageOptions.groups || [];
             var g_opts = '';
@@ -531,7 +471,6 @@ define([
                 escapeMarkup: function(m) { return m; }
             });
 
-            loading_tip.hide(); 
             form.removeClass('hide');
         },
 
diff --git a/static/scripts/common.js b/static/scripts/common.js
index 12bc0b4175..46be5d77ad 100644
--- a/static/scripts/common.js
+++ b/static/scripts/common.js
@@ -489,6 +489,45 @@ define([
             });
         },
 
+        contactInputOptionsForSelect2: {
+            placeholder: gettext("Enter emails or select contacts"),
+
+            // with 'tags', the user can directly enter, not just select
+            // tags need `<input type="hidden" />`, not `<select>`
+            tags: function () {
+                var contacts = app.pageOptions.contacts || [];
+                var contact_list = [];
+                for (var i = 0, len = contacts.length; i < len; i++) {
+                    contact_list.push({ // 'id' & 'text' are required by the plugin
+                        "id": contacts[i].email,
+                        // for search. both name & email can be searched.
+                        // use ' '(space) to separate name & email
+                        "text": contacts[i].name + ' ' + contacts[i].email,
+                        "avatar": contacts[i].avatar,
+                        "name": contacts[i].name
+                    });
+                }
+                return contact_list;
+            },
+
+            tokenSeparators: [',', ' '],
+
+            // format items shown in the drop-down menu
+            formatResult: function(item) {
+                if (item.avatar) {
+                    return item.avatar + '<span class="text">' + item.name + '<br />' + item.id + '</span>';
+                } else {
+                    return; // if no match, show nothing
+                }
+            },
+
+            // format selected item shown in the input
+            formatSelection: function(item) {
+                return item.name || item.id; // if no name, show the email, i.e., when directly input, show the email
+            },
+            escapeMarkup: function(m) { return m; }
+        },
+
         // check if a file is an image
         imageCheck: function (filename) {
             // no file ext