improve search user experience

Oqtane.Client/Modules/Admin/SearchResults/Index.razor

@@ -76,13 +76,9 @@
 
     protected override async Task OnInitializedAsync()
     {
-        if (PageState.QueryString.ContainsKey("q"))
+        if (_keywords == null && PageState.QueryString.ContainsKey("q"))
         {
             _keywords = WebUtility.UrlDecode(PageState.QueryString["q"]);
-        }
-
-        if (!string.IsNullOrEmpty(_keywords))
-        {
             await PerformSearch();
         }
     }
@@ -97,18 +93,25 @@
         _loading = true;
         StateHasChanged();
 
-        var searchQuery = new SearchQuery
-            {
-                SiteId = PageState.Site.SiteId,
-                Alias = PageState.Alias,
-                Keywords = _keywords,
-                SortDirection = _searchSortDirection,
-                SortField = _searchSortField,
-                PageIndex = 0,
-                PageSize = int.MaxValue
-            };
+        if (!string.IsNullOrEmpty(_keywords))
+        {
+            var searchQuery = new SearchQuery
+                {
+                    SiteId = PageState.Site.SiteId,
+                    Alias = PageState.Alias,
+                    Keywords = _keywords,
+                    SortDirection = _searchSortDirection,
+                    SortField = _searchSortField,
+                    PageIndex = 0,
+                    PageSize = int.MaxValue
+                };
 
-        _searchResults = await SearchResultsService.GetSearchResultsAsync(searchQuery);
+            _searchResults = await SearchResultsService.GetSearchResultsAsync(searchQuery);
+        }
+        else
+        {
+            AddModuleMessage(Localizer["NoCriteria"], MessageType.Info, "bottom");
+        }
 
         _loading = false;
         StateHasChanged();

Oqtane.Client/Resources/Modules/Admin/SearchResults/Index.resx

@@ -117,6 +117,9 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="NoCriteria" xml:space="preserve">
+    <value>You Must Provide Some Search Criteria</value>
+  </data>
   <data name="NoResult" xml:space="preserve">
     <value>No Content Matches The Criteria Provided</value>
   </data>

Oqtane.Client/Themes/Controls/Theme/Search.razor

@@ -53,7 +53,7 @@
     private void PerformSearch()
     {
         var keywords = HttpContext.HttpContext.Request.Form["keywords"];
-        if (!string.IsNullOrEmpty(keywords) && _searchResultsPage != null)
+        if (_searchResultsPage != null)
         {
             var url = NavigateUrl(_searchResultsPage.Path, $"q={keywords}");
             NavigationManager.NavigateTo(url);