fix(InputSelectize): Fix InputSelectize set method to clear selections

CHANGELOG.md

@@ -31,6 +31,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * Fix missing session when trying to display an error duing bookmarking. (#1984)
 
+* Fixed `set()` method of `InputSelectize` controller so it clears existing selections before applying new values. (#2024)
+
 
 ## [1.4.0] - 2025-04-08
 

shiny/playwright/controller/_input_controls.py

@@ -1197,10 +1197,33 @@ def set(
         if isinstance(selected, str):
             selected = [selected]
         self._loc_events.click()
+
+        currently_selected: list[str] = []
+        selected_items = self._loc_events.locator("> .item")
+        for i in range(selected_items.count()):
+            item = selected_items.nth(i)
+            data_value = item.get_attribute("data-value")
+            if data_value:
+                currently_selected.append(data_value)
+
+        current_set = set(currently_selected)
+        desired_set = set(selected)
+
+        for current_value in currently_selected:
+            if current_value not in desired_set:
+                item_to_remove = self._loc_events.locator(
+                    f"> .item[data-value='{current_value}']"
+                )
+                if item_to_remove.count() > 0:
+                    item_to_remove.click()
+                    self.page.keyboard.press("Delete")
+
         for value in selected:
-            self._loc_selectize.locator(f"[data-value='{value}']").click(
-                timeout=timeout
-            )
+            if value not in current_set:
+                self._loc_selectize.locator(f"[data-value='{value}']").click(
+                    timeout=timeout
+                )
+
         self._loc_events.press("Escape")
 
     def expect_choices(

tests/playwright/shiny/bugs/2013-selectize-set-does-not-clear/app_selectize.py

@@ -0,0 +1,21 @@
+from shiny import App, render, ui
+from shiny.session import Inputs, Outputs, Session
+
+app_ui = ui.page_fluid(
+    ui.input_selectize(
+        "test_selectize",
+        "Select",
+        ["Choice 1", "Choice 2", "Choice 3", "Choice 4"],
+        multiple=True,
+    ),
+    ui.output_text("test_selectize_output"),
+)
+
+
+def server(input: Inputs, output: Outputs, session: Session) -> None:
+    @render.text
+    def test_selectize_output():
+        return f"Selected: {', '.join(input.test_selectize())}"
+
+
+app = App(app_ui, server)

tests/playwright/shiny/bugs/2013-selectize-set-does-not-clear/test_app_selectize.py

@@ -0,0 +1,23 @@
+from playwright.sync_api import Page
+
+from shiny.playwright import controller
+from shiny.pytest import create_app_fixture
+from shiny.run import ShinyAppProc
+
+app = create_app_fixture("app_selectize.py")
+
+
+def test_inputselectize(page: Page, app: ShinyAppProc):
+    page.goto(app.url)
+
+    input_selectize = controller.InputSelectize(page, "test_selectize")
+    output_text = controller.OutputText(page, "test_selectize_output")
+
+    input_selectize.set(["Choice 1", "Choice 2", "Choice 3"])
+    output_text.expect_value("Selected: Choice 1, Choice 2, Choice 3")
+    input_selectize.set(["Choice 2", "Choice 3"])
+    output_text.expect_value("Selected: Choice 2, Choice 3")
+    input_selectize.set(["Choice 3"])
+    output_text.expect_value("Selected: Choice 3")
+    input_selectize.set([])
+    output_text.expect_value("Selected: ")