adds flag to ExternalWrapper to identify if the component is a temporary insertion

@plotly/dash-test-components/src/components/ExternalComponent.js

@@ -2,10 +2,9 @@ import React from 'react';
 import PropTypes from 'prop-types';
 
 
-const ExternalComponent = ({ id, text, input_id, extra_component }) => {
+const ExternalComponent = ({ id, text, input_id, extra_component, extra_component_temp }) => {
     const ctx = window.dash_component_api.useDashContext();
     const ExternalWrapper = window.dash_component_api.ExternalWrapper;
-
     return (
         <div id={id}>
             {text && <ExternalWrapper
@@ -18,13 +17,15 @@ const ExternalComponent = ({ id, text, input_id, extra_component }) => {
                         id: input_id
                     }
                 }}
-                componentPath={[...ctx.componentPath, 'external']}
+                componentPath={[JSON.stringify(ctx.componentPath), 'text']}
+                temp={true}
             />}
             {
                 extra_component &&
                 <ExternalWrapper
                     component={extra_component}
-                    componentPath={[...ctx.componentPath, 'extra']}
+                    componentPath={[...ctx.componentPath, 'props', 'extra_component']}
+                    temp={extra_component_temp}
             />}
         </div>
     )
@@ -39,6 +40,7 @@ ExternalComponent.propTypes = {
         namespace: PropTypes.string,
         props: PropTypes.object, 
     }),
+    extra_component_temp: PropTypes.bool,
 };
 
 export default ExternalComponent;

CHANGELOG.md

@@ -9,6 +9,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#3279](https://github.com/plotly/dash/pull/3279) Fix an issue where persisted values were incorrectly pruned when updated via callback. Now, callback returned values are correctly stored in the persistence storage. Fix [#2678](https://github.com/plotly/dash/issues/2678)
 - [#3298](https://github.com/plotly/dash/pull/3298) Fix dev_only resources filtering.
 - [#3315](https://github.com/plotly/dash/pull/3315) Fix pages module is package check.
+- [#3319](https://github.com/plotly/dash/pull/3319) Fix issue where `ExternalWrapper` would remove props from the parent component, now there is a `temp` that is passed to check if it should be removed on unmount.
 
 ## Added
 - [#3294](https://github.com/plotly/dash/pull/3294) Added the ability to pass `allow_optional` to Input and State to allow callbacks to work even if these components are not in the dash layout.

dash/dash-renderer/src/wrapper/ExternalWrapper.tsx

@@ -13,12 +13,13 @@ import {
 type Props = {
     component: DashComponent;
     componentPath: DashLayoutPath;
+    temp?: boolean; // If true, the component will be removed on unmount.
 };
 
 /**
  * For rendering components that are out of the regular layout tree.
  */
-function ExternalWrapper({component, componentPath}: Props) {
+function ExternalWrapper({component, componentPath, temp = false}: Props) {
     const dispatch: any = useDispatch();
     const [inserted, setInserted] = useState(false);
 
@@ -33,7 +34,9 @@ function ExternalWrapper({component, componentPath}: Props) {
         );
         setInserted(true);
         return () => {
-            dispatch(removeComponent({componentPath}));
+            if (temp) {
+                dispatch(removeComponent({componentPath}));
+            }
         };
     }, []);
 

tests/integration/renderer/test_external_component.py

@@ -59,3 +59,69 @@ def click(*_):
     dash_duo.wait_for_text_to_equal("#out", "clicked")
 
     assert dash_duo.get_logs() == []
+
+
+def test_rext002_render_external_component_temp(dash_duo):
+    app = Dash()
+    app.layout = html.Div(
+        [
+            dcc.Tabs(
+                [
+                    dcc.Tab(
+                        label="Tab 1",
+                        children=[
+                            ExternalComponent(
+                                id="ext",
+                                extra_component={
+                                    "type": "Div",
+                                    "namespace": "dash_html_components",
+                                    "props": {
+                                        "id": "extra",
+                                        "children": [
+                                            html.Div(
+                                                "extra children",
+                                                id={"type": "extra", "index": 1},
+                                            )
+                                        ],
+                                    },
+                                },
+                                extra_component_temp=True,
+                            ),
+                        ],
+                    ),
+                    dcc.Tab(
+                        label="Tab 2",
+                        children=[
+                            ExternalComponent(
+                                id="without-id",
+                                text="without-id",
+                            ),
+                        ],
+                    ),
+                ]
+            ),
+        ]
+    )
+
+    dash_duo.start_server(app)
+    dash_duo.wait_for_text_to_equal("#extra", "extra children")
+
+    dash_duo.find_element(".tab:nth-child(2)").click()
+    assert (
+        dash_duo.find_element("#without-id > input").get_attribute("value")
+        == "without-id"
+    )
+
+    dash_duo.find_element(".tab").click()
+    dash_duo.find_element("#ext")
+    assert (
+        len(dash_duo.find_elements("#ext > *")) == 0
+    ), "extra component should be removed"
+
+    dash_duo.find_element(".tab:nth-child(2)").click()
+    assert (
+        dash_duo.find_element("#without-id > input").get_attribute("value")
+        == "without-id"
+    )
+
+    assert dash_duo.get_logs() == []