[LiveComponent] Fix array valued checkboxes change event handling

src/LiveComponent/assets/dist/live_controller.js

@@ -311,18 +311,19 @@ function getElementAsTagText(element) {
         : element.outerHTML;
 }
 const getMultipleCheckboxValue = function (element, currentValues) {
+    const finalValues = [...currentValues];
     const value = inputValue(element);
     const index = currentValues.indexOf(value);
     if (element.checked) {
         if (index === -1) {
-            currentValues.push(value);
+            finalValues.push(value);
         }
-        return currentValues;
+        return finalValues;
     }
     if (index > -1) {
-        currentValues.splice(index, 1);
+        finalValues.splice(index, 1);
     }
-    return currentValues;
+    return finalValues;
 };
 const inputValue = function (element) {
     return element.dataset.value ? element.dataset.value : element.value;

src/LiveComponent/assets/src/dom_utils.ts

@@ -266,24 +266,25 @@ export function getElementAsTagText(element: HTMLElement): string {
 }
 
 const getMultipleCheckboxValue = function (element: HTMLInputElement, currentValues: Array<string>): Array<string> {
+    const finalValues = [...currentValues];
     const value = inputValue(element);
     const index = currentValues.indexOf(value);
 
     if (element.checked) {
         // Add value to an array if it's not in it already
         if (index === -1) {
-            currentValues.push(value);
+            finalValues.push(value);
         }
 
-        return currentValues;
+        return finalValues;
     }
 
     // Remove value from an array
     if (index > -1) {
-        currentValues.splice(index, 1);
+        finalValues.splice(index, 1);
     }
 
-    return currentValues;
+    return finalValues;
 };
 
 const inputValue = function (element: HTMLInputElement): string {

src/LiveComponent/assets/test/controller/model.test.ts

@@ -335,6 +335,38 @@ describe('LiveController data-model Tests', () => {
         expect(test.component.valueStore.getOriginalProps()).toEqual({form: {check: ['foo', 'bar']}});
     });
 
+    it('sends correct data for array valued checkbox fields with non-form object', async () => {
+        const test = await createTest({ check: [] }, (data: any) => `
+            <div ${initComponent(data)}>
+                <form data-model="*">
+                    <label>
+                        Checkbox 1: <input type="checkbox" name="check[]" value="foo" ${data.check.indexOf('foo') > -1 ? 'checked' : ''} />
+                    </label>
+
+                    <label>
+                        Checkbox 2: <input type="checkbox" name="check[]" value="bar" ${data.check.indexOf('bar') > -1 ? 'checked' : ''} />
+                    </label>
+                </form>
+
+                Checkbox 2 is ${data.check.indexOf('bar') > -1 ? 'checked' : 'unchecked' }
+            </div>
+        `);
+
+        const check1Element = getByLabelText(test.element, 'Checkbox 1:');
+        const check2Element = getByLabelText(test.element, 'Checkbox 2:');
+
+        // only 1 Ajax call will be made thanks to debouncing
+        test.expectsAjaxCall()
+            .expectUpdatedData({ 'check': ['foo', 'bar'] });
+
+        await userEvent.click(check1Element);
+        await userEvent.click(check2Element);
+
+        await waitFor(() => expect(test.element).toHaveTextContent('Checkbox 2 is checked'));
+
+        expect(test.component.valueStore.getOriginalProps()).toEqual({check: ['foo', 'bar']});
+    });
+
     it('sends correct data for array valued checkbox fields with initial data', async () => {
         const test = await createTest({ form: { check: ['foo']} }, (data: any) => `
             <div ${initComponent(data)}>
@@ -367,6 +399,36 @@ describe('LiveController data-model Tests', () => {
         expect(test.component.valueStore.getOriginalProps()).toEqual({form: {check: ['bar']}});
     });
 
+    it('sends correct data for array valued checkbox fields with non-form object and with initial data', async () => {
+        const test = await createTest({ check: ['foo'] }, (data: any) => `
+            <div ${initComponent(data)}>
+                <label>
+                    Checkbox 1: <input type="checkbox" data-model="check[]" value="foo" ${data.check.indexOf('foo') > -1 ? 'checked' : ''} />
+                </label>
+
+                <label>
+                    Checkbox 2: <input type="checkbox" data-model="check[]" value="bar" ${data.check.indexOf('bar') > -1 ? 'checked' : ''} />
+                </label>
+
+                Checkbox 1 is ${data.check.indexOf('foo') > -1 ? 'checked' : 'unchecked' }
+            </div>
+        `);
+
+        const check1Element = getByLabelText(test.element, 'Checkbox 1:');
+        const check2Element = getByLabelText(test.element, 'Checkbox 2:');
+
+        // only 1 Ajax call will be made thanks to debouncing
+        test.expectsAjaxCall()
+            .expectUpdatedData({ 'check': ['bar'] });
+
+        await userEvent.click(check1Element);
+        await userEvent.click(check2Element);
+
+        await waitFor(() => expect(test.element).toHaveTextContent('Checkbox 1 is unchecked'));
+
+        expect(test.component.valueStore.getOriginalProps()).toEqual({check: ['bar']});
+    });
+
     it('sends correct data for select multiple field', async () => {
         const test = await createTest({ form: { select: []} }, (data: any) => `
             <div ${initComponent(data)}>

src/LiveComponent/doc/index.rst

@@ -531,9 +531,9 @@ value on checked. If no ``value`` is set, the checkbox will set a boolean value:
 
     <input type="checkbox" data-model="agreeToTerms">
 
-    <input type="checkbox" data-model="foods" value="pizza">
-    <input type="checkbox" data-model="foods" value="tacos">
-    <input type="checkbox" data-model="foods" value="sushi">
+    <input type="checkbox" data-model="foods[]" value="pizza">
+    <input type="checkbox" data-model="foods[]" value="tacos">
+    <input type="checkbox" data-model="foods[]" value="sushi">
 
 ``select`` and ``radio`` elements are a bit easier: use these to either set a
 single value or an array of values::