Update app.py

app.py

@@ -17,26 +17,39 @@ and reveal more information about the selected subgroup through the power
 of cross-filtering.
 """
 
+text = pn.pane.Markdown(instructions)
+
 # Add filter list row with spacing
 filter_list = pn.widgets.CheckButtonGroup(
     name='Filter Options',
     options=["option1", "option2", "option3"],
     button_type='success',
-    sizing_mode='fixed', 
-    button_style = 'solid',
-    # button_type = 'default',
-    margin=(5, 10)
+    sizing_mode='fixed',  # Use fixed sizing mode to add spacing
+    margin=(5, 10)  # Adjust the margin to add spacing (vertical, horizontal)
 )
 
-text = pn.pane.Markdown(instructions)
+# Create a TextInput widget to get new filter options from the user
+new_option_input = pn.widgets.TextInput(name="Add new filter option", value="", sizing_mode="stretch_width")
+
+# Create an empty CheckboxGroup widget to hold the checklist for adding options
+new_options_checklist = pn.widgets.CheckboxGroup(name="Choose options to add", options=[], sizing_mode="stretch_width")
+
+# Callback for the "+" button to show the checklist for adding options
+def show_checklist(event):
+    options = filter_list.options + [new_option_input.value]
+    new_options_checklist.options = options
+
+# "+" button
+add_option_button = Button(label="+", button_type="primary")
+add_option_button.on_click(show_checklist)
 
 # Layout using Template
 template = pn.template.FastListTemplate(
-    title="EasySciRead", 
-    sidebar=[buttons],
-    header=[filter_list],
+    title="EasySciRead",
     main=[
         pn.Row(filter_list, sizing_mode='stretch_width'),  # Filter list row before the text
+        pn.Row(add_option_button, new_option_input),  # Add the "+" button and input for new option
+        pn.Row(new_options_checklist),  # Add the checklist row (initially empty)
         pn.Column(text),
     ],
     accent_base_color="#88d8b0",