Fix Dropdown multi option removed update value.

CHANGELOG.md

@@ -20,6 +20,12 @@ This project adheres to [Semantic Versioning](https://semver.org/).
   - Upgrade `black` to v22.3.0 for Python 3.7+ - if you use `dash[ci]` and you call `black`, this may alter your code formatting slightly, including more consistently breaking Python 2 compatibility.
   - Many other mainly JS dependency upgrades to the internals of Dash renderer and components. These may patch bugs or improve performance.
 
+### Fixed
+
+- [#1970](https://github.com/plotly/dash/pull/1970) dcc.Dropdown Refactor fixes:
+  - Fix bug [#1868](https://github.com/plotly/dash/issues/1868) value does not update when selected option removed from options.
+  - Fix bug [#1908](https://github.com/plotly/dash/issues/1908) Selected options not showing when the value contains a comma.
+
 ## [2.3.1] - 2022-03-29
 
 ### Fixed

components/dash-core-components/src/fragments/Dropdown.react.js

@@ -1,5 +1,5 @@
-import {isNil, pluck, omit, type} from 'ramda';
-import React, {Component} from 'react';
+import {isNil, pluck, without, pick} from 'ramda';
+import React, {useState, useCallback, useEffect, useMemo} from 'react';
 import ReactDropdown from 'react-virtualized-select';
 import createFilterOptions from 'react-select-fast-filter-options';
 import '../components/css/react-virtualized-select@3.1.0.css';
@@ -21,90 +21,111 @@ const TOKENIZER = {
     },
 };
 
-const DELIMITER = ',';
+const RDProps = [
+    'multi',
+    'clearable',
+    'searchable',
+    'search_value',
+    'placeholder',
+    'disabled',
+    'optionHeight',
+    'style',
+    'className',
+];
 
-export default class Dropdown extends Component {
-    constructor(props) {
-        super(props);
-        this.state = {
-            filterOptions: createFilterOptions({
-                options: sanitizeOptions(props.options),
+const Dropdown = props => {
+    const {
+        id,
+        clearable,
+        multi,
+        options,
+        setProps,
+        style,
+        loading_state,
+        value,
+    } = props;
+    const [optionsCheck, setOptionsCheck] = useState(null);
+    const [sanitizedOptions, filterOptions] = useMemo(() => {
+        const sanitized = sanitizeOptions(options);
+        return [
+            sanitized,
+            createFilterOptions({
+                options: sanitized,
                 tokenizer: TOKENIZER,
             }),
-        };
-    }
+        ];
+    }, [options]);
 
-    UNSAFE_componentWillReceiveProps(newProps) {
-        if (newProps.options !== this.props.options) {
-            this.setState({
-                filterOptions: createFilterOptions({
-                    options: sanitizeOptions(newProps.options),
-                    tokenizer: TOKENIZER,
-                }),
-            });
-        }
-    }
+    const onChange = useCallback(
+        selectedOption => {
+            if (multi) {
+                let value;
+                if (isNil(selectedOption)) {
+                    value = [];
+                } else {
+                    value = pluck('value', selectedOption);
+                }
+                setProps({value});
+            } else {
+                let value;
+                if (isNil(selectedOption)) {
+                    value = null;
+                } else {
+                    value = selectedOption.value;
+                }
+                setProps({value});
+            }
+        },
+        [multi]
+    );
 
-    render() {
-        const {
-            id,
-            clearable,
-            multi,
-            options,
-            setProps,
-            style,
-            loading_state,
-            value,
-        } = this.props;
-        const {filterOptions} = this.state;
-        let selectedValue;
-        if (type(value) === 'Array') {
-            selectedValue = value.join(DELIMITER);
-        } else {
-            selectedValue = value;
-        }
-        return (
-            <div
-                id={id}
-                className="dash-dropdown"
-                style={style}
-                data-dash-is-loading={
-                    (loading_state && loading_state.is_loading) || undefined
+    const onInputChange = useCallback(
+        search_value => setProps({search_value}),
+        []
+    );
+
+    useEffect(() => {
+        if (optionsCheck !== sanitizedOptions && !isNil(value)) {
+            const values = sanitizedOptions.map(option => option.value);
+            if (multi && Array.isArray(value)) {
+                const invalids = value.filter(v => !values.includes(v));
+                if (invalids.length) {
+                    setProps({value: without(invalids, value)});
                 }
-            >
-                <ReactDropdown
-                    filterOptions={filterOptions}
-                    options={sanitizeOptions(options)}
-                    value={selectedValue}
-                    onChange={selectedOption => {
-                        if (multi) {
-                            let value;
-                            if (isNil(selectedOption)) {
-                                value = [];
-                            } else {
-                                value = pluck('value', selectedOption);
-                            }
-                            setProps({value});
-                        } else {
-                            let value;
-                            if (isNil(selectedOption)) {
-                                value = null;
-                            } else {
-                                value = selectedOption.value;
-                            }
-                            setProps({value});
-                        }
-                    }}
-                    onInputChange={search_value => setProps({search_value})}
-                    backspaceRemoves={clearable}
-                    deleteRemoves={clearable}
-                    inputProps={{autoComplete: 'off'}}
-                    {...omit(['setProps', 'value', 'options'], this.props)}
-                />
-            </div>
-        );
-    }
-}
+            } else {
+                if (!values.includes(value)) {
+                    setProps({value: null});
+                }
+            }
+            setOptionsCheck(sanitizedOptions);
+        }
+    }, [sanitizedOptions, optionsCheck, multi, value]);
+
+    return (
+        <div
+            id={id}
+            className="dash-dropdown"
+            style={style}
+            data-dash-is-loading={
+                (loading_state && loading_state.is_loading) || undefined
+            }
+        >
+            <ReactDropdown
+                filterOptions={filterOptions}
+                options={sanitizeOptions(options)}
+                value={value}
+                onChange={onChange}
+                onInputChange={onInputChange}
+                backspaceRemoves={clearable}
+                deleteRemoves={clearable}
+                inputProps={{autoComplete: 'off'}}
+                {...pick(RDProps, props)}
+            />
+        </div>
+    );
+};
 
 Dropdown.propTypes = propTypes;
 Dropdown.defaultProps = defaultProps;
+
+export default Dropdown;

components/dash-core-components/tests/integration/dropdown/test_dynamic_options.py

@@ -52,24 +52,18 @@ def update_options(search_value):
     assert dash_dcc.get_logs() == []
 
 
-def test_dddo002_array_value(dash_dcc):
-    dropdown_options = [
-        {"label": "New York City", "value": "New,York,City"},
-        {"label": "Montreal", "value": "Montreal"},
-        {"label": "San Francisco", "value": "San,Francisco"},
-    ]
-
+def test_dddo002_array_comma_value(dash_dcc):
     app = Dash(__name__)
-    arrayValue = ["San", "Francisco"]
 
     dropdown = dcc.Dropdown(
-        options=dropdown_options,
-        value=arrayValue,
+        options=["New York, NY", "Montreal, QC", "San Francisco, CA"],
+        value=["San Francisco, CA"],
+        multi=True,
     )
-    app.layout = html.Div([dropdown])
+    app.layout = html.Div(dropdown)
 
     dash_dcc.start_server(app)
 
-    dash_dcc.wait_for_text_to_equal("#react-select-2--value-item", "San Francisco")
+    dash_dcc.wait_for_text_to_equal("#react-select-2--value-0", "San Francisco, CA\n ")
 
     assert dash_dcc.get_logs() == []

components/dash-core-components/tests/integration/dropdown/test_remove_option.py

@@ -0,0 +1,84 @@
+import json
+
+from dash import Dash, html, dcc, Output, Input
+from dash.exceptions import PreventUpdate
+
+
+sample_dropdown_options = [
+    {"label": "New York City", "value": "NYC"},
+    {"label": "Montreal", "value": "MTL"},
+    {"label": "San Francisco", "value": "SF"},
+]
+
+
+def test_ddro001_remove_option_single(dash_dcc):
+    dropdown_options = sample_dropdown_options
+
+    app = Dash(__name__)
+    value = "SF"
+
+    app.layout = html.Div(
+        [
+            dcc.Dropdown(
+                options=dropdown_options,
+                value=value,
+                id="dropdown",
+            ),
+            html.Button("Remove option", id="remove"),
+            html.Div(id="value-output"),
+        ]
+    )
+
+    @app.callback(Output("dropdown", "options"), [Input("remove", "n_clicks")])
+    def on_click(n_clicks):
+        if not n_clicks:
+            raise PreventUpdate
+        return sample_dropdown_options[:-1]
+
+    @app.callback(Output("value-output", "children"), [Input("dropdown", "value")])
+    def on_change(val):
+        if not val:
+            raise PreventUpdate
+        return val or "None"
+
+    dash_dcc.start_server(app)
+    btn = dash_dcc.wait_for_element("#remove")
+    btn.click()
+
+    dash_dcc.wait_for_text_to_equal("#value-output", "None")
+
+
+def test_ddro002_remove_option_multi(dash_dcc):
+    dropdown_options = sample_dropdown_options
+
+    app = Dash(__name__)
+    value = ["MTL", "SF"]
+
+    app.layout = html.Div(
+        [
+            dcc.Dropdown(
+                options=dropdown_options,
+                value=value,
+                multi=True,
+                id="dropdown",
+            ),
+            html.Button("Remove option", id="remove"),
+            html.Div(id="value-output"),
+        ]
+    )
+
+    @app.callback(Output("dropdown", "options"), [Input("remove", "n_clicks")])
+    def on_click(n_clicks):
+        if not n_clicks:
+            raise PreventUpdate
+        return sample_dropdown_options[:-1]
+
+    @app.callback(Output("value-output", "children"), [Input("dropdown", "value")])
+    def on_change(val):
+        return json.dumps(val)
+
+    dash_dcc.start_server(app)
+    btn = dash_dcc.wait_for_element("#remove")
+    btn.click()
+
+    dash_dcc.wait_for_text_to_equal("#value-output", '["MTL"]')

components/dash-html-components/dash_html_components_base/__init__.py

@@ -33,27 +33,27 @@
 
 _js_dist = [
     {
-        "relative_package_path": 'html/{}.min.js'.format(_this_module),
+        "relative_package_path": "html/{}.min.js".format(_this_module),
         "external_url": (
             "https://unpkg.com/dash-html-components@{}"
             "/dash_html_components/dash_html_components.min.js"
         ).format(__version__),
-        "namespace": "dash"
+        "namespace": "dash",
     },
     {
-        'relative_package_path': 'html/{}.min.js.map'.format(_this_module),
-        'external_url': (
-            'https://unpkg.com/dash-html-components@{}'
-            '/dash_html_components/dash_html_components.min.js.map'
+        "relative_package_path": "html/{}.min.js.map".format(_this_module),
+        "external_url": (
+            "https://unpkg.com/dash-html-components@{}"
+            "/dash_html_components/dash_html_components.min.js.map"
         ).format(__version__),
-        'namespace': 'dash',
-        'dynamic': True
-    }
+        "namespace": "dash",
+        "dynamic": True,
+    },
 ]
 
 _css_dist = []
 
 
 for _component in __all__:
-    setattr(locals()[_component], '_js_dist', _js_dist)
-    setattr(locals()[_component], '_css_dist', _css_dist)
+    setattr(locals()[_component], "_js_dist", _js_dist)
+    setattr(locals()[_component], "_css_dist", _css_dist)

components/dash-html-components/setup.py

@@ -2,22 +2,22 @@
 import json
 from setuptools import setup
 
-with open('package.json') as f:
+with open("package.json") as f:
     package = json.load(f)
 
 package_name = str(package["name"].replace(" ", "_").replace("-", "_"))
 
 setup(
-    name='dash_html_components',
+    name="dash_html_components",
     version=package["version"],
-    author=package['author'],
-    author_email='chris@plotly.com',
+    author=package["author"],
+    author_email="chris@plotly.com",
     packages=[package_name],
-    url='https://github.com/plotly/dash-html-components',
+    url="https://github.com/plotly/dash-html-components",
     include_package_data=True,
-    license=package['license'],
-    description=package['description'] if 'description' in package else package_name,
-    long_description=io.open('README.md', encoding='utf-8').read(),
-    long_description_content_type='text/markdown',
-    install_requires=[]
+    license=package["license"],
+    description=package["description"] if "description" in package else package_name,
+    long_description=io.open("README.md", encoding="utf-8").read(),
+    long_description_content_type="text/markdown",
+    install_requires=[],
 )