allow_duplicates to work with Loading

CHANGELOG.md

@@ -10,6 +10,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#3284](https://github.com/plotly/dash/pull/3284) Fix component as props having the same key when used in the same container.
 - [#3287](https://github.com/plotly/dash/pull/3287) Fix typing component generation & explicitize_args.
 - [#3282](https://github.com/plotly/dash/pull/3282) Fix incorrect cancellation of pattern matched long callbacks.
+- [#3289](https://github.com/plotly/dash/pull/3289) Fixed issue with debugTitle where status doesnt exist and allow_duplicates to ignore the hash for prop loading in the target.
 
 ## [3.0.3] - 2025-04-14
 

components/dash-core-components/src/fragments/Loading/spinners/CircleSpinner.jsx

@@ -16,7 +16,7 @@ const CircleSpinner = ({
     style,
 }) => {
     let debugTitle;
-    if (debug) {
+    if (debug && status) {
         debugTitle = status.map((s) => <DebugTitle {...s} />);
     }
     let spinnerClass = fullscreen ? 'dash-spinner-container' : '';

components/dash-core-components/src/fragments/Loading/spinners/CubeSpinner.jsx

@@ -7,7 +7,7 @@ import DebugTitle from './DebugTitle.jsx';
 
 const CubeSpinner = ({status, color, fullscreen, debug, className, style}) => {
     let debugTitle;
-    if (debug) {
+    if (debug && status) {
         debugTitle = status.map((s) => <DebugTitle {...s} />);
     }
     let spinnerClass = fullscreen ? 'dash-spinner-container' : '';

components/dash-core-components/src/fragments/Loading/spinners/DefaultSpinner.jsx

@@ -15,7 +15,7 @@ const DefaultSpinner = ({
     style,
 }) => {
     let debugTitle;
-    if (debug) {
+    if (debug && status) {
         debugTitle = status.map((s) => <DebugTitle {...s} />);
     }
     let spinnerClass = fullscreen ? 'dash-spinner-container' : '';

components/dash-core-components/src/fragments/Loading/spinners/DotSpinner.jsx

@@ -8,7 +8,7 @@ import DebugTitle from './DebugTitle.jsx';
  */
 const DotSpinner = ({status, color, fullscreen, debug, className, style}) => {
     let debugTitle;
-    if (debug) {
+    if (debug && status) {
         debugTitle = status.map((s) => <DebugTitle {...s} />);
     }
     let spinnerClass = fullscreen ? 'dash-spinner-container' : '';

components/dash-core-components/src/fragments/Loading/spinners/GraphSpinner.jsx

@@ -5,7 +5,7 @@ import DebugTitle from './DebugTitle.jsx';
 
 const GraphSpinner = ({status, fullscreen, debug, className, style}) => {
     let debugTitle;
-    if (debug) {
+    if (debug && status) {
         debugTitle = status.map((s) => <DebugTitle {...s} />);
     }
     let spinnerClass = fullscreen ? 'dash-spinner-container' : '';

components/dash-core-components/tests/integration/loading/test_loading_component.py

@@ -689,3 +689,69 @@ def updateDiv(n_clicks):
     dash_dcc.wait_for_text_to_equal("#div-1", "changed")
 
     assert dash_dcc.get_logs() == []
+
+
+# multiple components, only one triggers the spinner
+def test_ldcp017_loading_component_target_components_duplicates(dash_dcc):
+
+    lock = Lock()
+
+    app = Dash(__name__)
+
+    app.layout = html.Div(
+        [
+            dcc.Loading(
+                [
+                    html.Button(id="btn-1"),
+                    html.Button(id="btn-2", children="content 2"),
+                ],
+                className="loading-1",
+                target_components={"btn-2": "children"},
+                debug=True,
+            )
+        ],
+        id="root",
+    )
+
+    @app.callback(Output("btn-1", "children"), [Input("btn-2", "n_clicks")])
+    def updateDiv1(n_clicks):
+        if n_clicks:
+            with lock:
+                return "changed 1"
+
+        return "content 1"
+
+    @app.callback(
+        Output("btn-2", "children", allow_duplicate=True),
+        [Input("btn-1", "n_clicks")],
+        prevent_initial_call=True,
+    )
+    def updateDiv2(n_clicks):
+        if n_clicks:
+            with lock:
+                return "changed 2"
+
+        return "content 2"
+
+    dash_dcc.start_server(app)
+
+    dash_dcc.wait_for_text_to_equal("#btn-1", "content 1")
+    dash_dcc.wait_for_text_to_equal("#btn-2", "content 2")
+
+    with lock:
+        dash_dcc.find_element("#btn-1").click()
+
+        dash_dcc.find_element(".loading-1 .dash-spinner")
+        dash_dcc.wait_for_text_to_equal("#btn-2", "")
+
+    dash_dcc.wait_for_text_to_equal("#btn-2", "changed 2")
+
+    with lock:
+        dash_dcc.find_element("#btn-2").click()
+        spinners = dash_dcc.find_elements(".loading-1 .dash-spinner")
+        dash_dcc.wait_for_text_to_equal("#btn-1", "")
+
+    dash_dcc.wait_for_text_to_equal("#btn-1", "changed 1")
+    assert spinners == []
+
+    assert dash_dcc.get_logs() == []

dash/dash-renderer/src/actions/callbacks.ts

@@ -748,7 +748,7 @@ export function executeCallback(
         const __execute = async (): Promise<CallbackResult> => {
             const loadingOutputs = outputs.map(out => ({
                 path: getPath(paths, out.id),
-                property: out.property,
+                property: out.property?.split('@')[0],
                 id: out.id
             }));
             dispatch(loading(loadingOutputs));