add search_field_placeholder for search_fields

Author: wuyue92tree

adminlteui/admin.py

@@ -50,6 +50,7 @@ def get_image_box():
 
 class ModelAdmin(admin.ModelAdmin):
     select2_list_filter = ()
+    search_field_placeholder = ''
 
     class Media:
         css = {
@@ -62,6 +63,7 @@ class Media:
     def changelist_view(self, request, extra_context=None):
         view = super().changelist_view(request, extra_context)
         cl = view.context_data.get('cl')
+        cl.search_field_placeholder = self.search_field_placeholder
         filter_specs = cl.filter_specs
 
         for index, filter_spec in enumerate(filter_specs):

adminlteui/templates/admin/search_form.html

@@ -12,7 +12,7 @@
     {% if cl.search_fields %}
     <!-- DIV needed for valid HTML -->
     <div class="form-group" style="margin-bottom: 5px;">
-        <input class="form-control" type="text" size="40" name="{{ search_var }}" value="{{ cl.query }}" id="searchbar" autofocus>
+        <input class="form-control" type="text" size="40" placeholder="{{ cl.search_field_placeholder }}" name="{{ search_var }}" value="{{ cl.query }}" id="searchbar" autofocus>
     </div>
     {% endif %}
     {% if cl.has_filters or cl.search_fields %}