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feat(combo): fix initial combo dropdown height #16160

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b8606a8
feat(combo): fix initial combo height
didimmova Aug 21, 2025
b8f236a
Merge branch '20.0.x' into didimmova/fix-combo-initial-height
Lipata Aug 21, 2025
b456e86
Merge branch '20.0.x' into didimmova/fix-combo-initial-height
simeonoff Aug 21, 2025
6ae20ca
test(combo/simple-combo): fix tests
didimmova Aug 22, 2025
df24051
feat(combo): fix indigo dropdown initial height
didimmova Aug 25, 2025
8f99c32
feat(combo): fix indigo initial combo height
didimmova Aug 25, 2025
b4120a4
Merge branch '20.0.x' into didimmova/fix-combo-initial-height
didimmova Aug 25, 2025
b272d87
Merge branch '20.0.x' into didimmova/fix-combo-initial-height
desig9stein Aug 27, 2025
c96cd17
Merge branch '20.0.x' into didimmova/fix-combo-initial-height
simeonoff Sep 1, 2025
728c62e
refactor(combo): use CSS variable to set item count
simeonoff Sep 2, 2025
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58 changes: 28 additions & 30 deletions projects/igniteui-angular/src/lib/combo/combo.component.spec.ts
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,7 @@ const CSS_CLASS_EMPTY = 'igx-combo__empty';
const CSS_CLASS_ITEM_CHECKBOX = 'igx-combo__checkbox';
const CSS_CLASS_ITME_CHECKBOX_CHECKED = 'igx-checkbox--checked';
const defaultDropdownItemHeight = 40;
const defaultDropdownItemMaxHeight = 400;
const defaultDropdownItemMaxHeight = 240;

describe('igxCombo', () => {
let fixture: ComponentFixture<any>;
Expand Down Expand Up @@ -1195,17 +1195,18 @@ describe('igxCombo', () => {
it('should render selected items properly', () => {
combo.toggle();
fixture.detectChanges();

const dropdownList = fixture.debugElement.query(By.css(`.${CSS_CLASS_DROPDOWNLIST_SCROLL}`)).nativeElement;
const dropdownItems = dropdownList.querySelectorAll(`.${CSS_CLASS_DROPDOWNLISTITEM}`);


expect(dropdownItems[1].classList.contains(CSS_CLASS_SELECTED)).toBeFalsy();
expect(dropdownItems[3].classList.contains(CSS_CLASS_SELECTED)).toBeFalsy();
expect(dropdownItems[7].classList.contains(CSS_CLASS_SELECTED)).toBeFalsy();

combo.select(['Illinois', 'Mississippi', 'Ohio']);
combo.select(['Illinois', 'Ohio']);
fixture.detectChanges();
expect(dropdownItems[1].classList.contains(CSS_CLASS_SELECTED)).toBeTruthy();
expect(dropdownItems[3].classList.contains(CSS_CLASS_SELECTED)).toBeTruthy();
expect(dropdownItems[7].classList.contains(CSS_CLASS_SELECTED)).toBeTruthy();

combo.deselect(['Ohio']);
fixture.detectChanges();
Expand All @@ -1225,9 +1226,9 @@ describe('igxCombo', () => {
expect(focusedItem_1.classList.contains(CSS_CLASS_FOCUSED)).toBeTruthy();

// Change focus
dropdown.navigateItem(6);
dropdown.navigateItem(4);
fixture.detectChanges();
const focusedItem_2 = dropdownItems[5];
const focusedItem_2 = dropdownItems[3];
expect(focusedItem_2.classList.contains(CSS_CLASS_FOCUSED)).toBeTruthy();
expect(focusedItem_1.classList.contains(CSS_CLASS_FOCUSED)).toBeFalsy();
});
Expand Down Expand Up @@ -1772,7 +1773,7 @@ describe('igxCombo', () => {
dropdown.toggle();
fixture.detectChanges();
expect(dropdown.items).toBeDefined();
expect(dropdown.items.length).toEqual(9);
expect(dropdown.items.length).toEqual(5);
dropdown.onFocus();
expect(dropdown.focusedItem).toEqual(dropdown.items[0]);
expect(dropdown.focusedItem.focused).toEqual(true);
Expand Down Expand Up @@ -1894,17 +1895,17 @@ describe('igxCombo', () => {
selectedItemsCount++;
selectAndVerifyItem(0);

for (let index = 1; index < 7; index++) {
for (let index = 1; index < 5; index++) {
focusAndVerifyItem(index, 'ArrowDown');
}
selectedItemsCount++;
selectAndVerifyItem(6);
selectAndVerifyItem(4);

for (let index = 5; index > 3; index--) {
for (let index = 3; index >= 2; index--) {
focusAndVerifyItem(index, 'ArrowUp');
}
selectedItemsCount++;
selectAndVerifyItem(4);
selectAndVerifyItem(2);
});
it('should properly navigate using HOME/END key', (async () => {
let firstVisibleItem: Element;
Expand Down Expand Up @@ -2072,7 +2073,7 @@ describe('igxCombo', () => {
const scrollbar = fixture.debugElement.query(By.css(`.${CSS_CLASS_SCROLLBAR_VERTICAL}`)).nativeElement as HTMLElement;
expect(scrollbar.scrollTop).toEqual(0);

combo.virtualScrollContainer.scrollTo(16);
combo.virtualScrollContainer.scrollTo(12);
await firstValueFrom(combo.virtualScrollContainer.chunkLoad);
fixture.detectChanges();
let selectedItem = fixture.debugElement.queryAll(By.css(`.${CSS_CLASS_DROPDOWNLISTITEM}`))[1];
Expand All @@ -2088,7 +2089,7 @@ describe('igxCombo', () => {
// Content was scrolled to bottom
expect(scrollbar.scrollHeight - scrollbar.scrollTop).toEqual(scrollbar.clientHeight);

combo.virtualScrollContainer.scrollTo(5);
combo.virtualScrollContainer.scrollTo(4);
await firstValueFrom(combo.virtualScrollContainer.chunkLoad);
fixture.detectChanges();
selectedItem = fixture.debugElement.query(By.css(`.${CSS_CLASS_SELECTED}`));
Expand Down Expand Up @@ -2163,15 +2164,14 @@ describe('igxCombo', () => {
expect(input.nativeElement.value).toEqual(expectedOutput);
});
it('should dismiss all selected items by pressing clear button', () => {
const expectedOutput = 'Kentucky, Ohio, Indiana';
combo.select(['Kentucky', 'Ohio', 'Indiana']);
const expectedOutput = 'Ohio, Indiana';
combo.select(['Ohio', 'Indiana']);
fixture.detectChanges();
expect(input.nativeElement.value).toEqual(expectedOutput);
combo.toggle();
fixture.detectChanges();
expect(combo.dropdown.items[1].selected).toBeTruthy();
expect(combo.dropdown.items[4].selected).toBeTruthy();
expect(combo.dropdown.items[6].selected).toBeTruthy();

const clearBtn = fixture.debugElement.query(By.css(`.${CSS_CLASS_CLEARBUTTON}`));
clearBtn.triggerEventHandler('click', UIInteractions.getMouseEvent('click'));
Expand All @@ -2184,7 +2184,6 @@ describe('igxCombo', () => {
fixture.detectChanges();
expect(combo.dropdown.items[1].selected).toBeFalsy();
expect(combo.dropdown.items[4].selected).toBeFalsy();
expect(combo.dropdown.items[6].selected).toBeFalsy();
});
it('should show/hide clear button after selecting/deselecting items', () => {
// This is a workaround for issue github.com/angular/angular/issues/14235
Expand Down Expand Up @@ -2242,8 +2241,8 @@ describe('igxCombo', () => {
cancel: false
});

const selectedItem_2 = dropdown.items[5];
simulateComboItemClick(5);
const selectedItem_2 = dropdown.items[4];
simulateComboItemClick(4);
expect(combo.selection[1]).toEqual(selectedItem_2.value);
expect(combo.value[1]).toEqual(selectedItem_2.value[combo.valueKey]);
expect(selectedItem_2.selected).toBeTruthy();
Expand Down Expand Up @@ -2691,19 +2690,19 @@ describe('igxCombo', () => {
combo.toggle();
fixture.detectChanges();
let headers = combo.dropdown.headers.map(header => header.element.nativeElement.innerText);
expect(headers).toEqual(['Ángel', 'Boris', 'México', 'Méxícó']);
expect(headers).toEqual(['Ángel', 'Boris', 'México']);

combo.groupSortingDirection = SortingDirection.Desc;
combo.toggle();
fixture.detectChanges();
headers = combo.dropdown.headers.map(header => header.element.nativeElement.innerText);
expect(headers).toEqual(['Méxícó', 'México', 'Boris', 'Ángel']);
expect(headers).toEqual(['Méxícó', 'México', 'Boris']);

combo.groupSortingDirection = SortingDirection.None;
combo.toggle();
fixture.detectChanges();
headers = combo.dropdown.headers.map(header => header.element.nativeElement.innerText);
expect(headers).toEqual(['Méxícó', 'Ángel', 'México', 'Boris']);
expect(headers).toEqual(['Méxícó', 'Ángel', 'México']);
});
});
describe('Filtering tests: ', () => {
Expand Down Expand Up @@ -2862,8 +2861,8 @@ describe('igxCombo', () => {

verifyFilteredItems('jose', 1);
verifyFilteredItems('mexico', 3);
verifyFilteredItems('o', 7);
verifyFilteredItems('é', 7);
verifyFilteredItems('o', 6);
verifyFilteredItems('é', 6);
}));

it('should filter the dropdown items when typing in the search input', fakeAsync(() => {
Expand All @@ -2888,9 +2887,9 @@ describe('igxCombo', () => {
dropdownItems = dropdownList.querySelectorAll(`.${CSS_CLASS_DROPDOWNLISTITEM}`);
expect(dropdownItems.length).toEqual(expectedItemsNumber);
};
verifyFilteredItems('M', 7);
verifyFilteredItems('M', 4);

verifyFilteredItems('Mi', 5);
verifyFilteredItems('Mi', 3);
expectedValues = expectedValues.filter(data => data.field.toLowerCase().includes('mi'));
checkFilteredItems(dropdownItems);

Expand Down Expand Up @@ -2960,9 +2959,9 @@ describe('igxCombo', () => {
expect(combo.filteredData.length).toEqual(expectedFilteredItemsNumber);
};

verifyFilteredItems('M', 7, 15);
verifyFilteredItems('Mi', 5, 5);
verifyFilteredItems('M', 7, 15);
verifyFilteredItems('M', 4, 15);
verifyFilteredItems('Mi', 3, 5);
verifyFilteredItems('M', 4, 15);
combo.filteredData.forEach((item) => expect(combo.data).toContain(item));
});
it('should clear the search input and close the dropdown list on pressing ESC key', fakeAsync(() => {
Expand Down Expand Up @@ -3768,7 +3767,6 @@ class IgxComboFormComponent {
password: ['', Validators.required],
townCombo: [[this.items[0]], Validators.required]
});

}
public onSubmitReactive() { }

Expand Down
8 changes: 7 additions & 1 deletion projects/igniteui-angular/src/lib/core/styles/components/combo/_combo-theme.scss
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Original file line number Diff line number Diff line change
Expand Up @@ -98,9 +98,15 @@
}

%igx-combo__content {
--item-count: 6;

position: relative;
overflow: hidden;
max-height: calc(var(--size) * 10);
max-height: calc(var(--size) * var(--item-count));

@if $variant == 'indigo' {
max-height: calc(var(--size) * var(--item-count) + rem(16px));
}

&:focus {
outline: transparent;
Expand Down
6 changes: 3 additions & 3 deletions projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@ const CSS_CLASS_FOOTER = 'footer-class';
const CSS_CLASS_INPUT_GROUP_REQUIRED = 'igx-input-group--required';
const CSS_CLASS_INPUT_GROUP_INVALID = 'igx-input-group--invalid';
const defaultDropdownItemHeight = 40;
const defaultDropdownItemMaxHeight = 400;
const defaultDropdownItemMaxHeight = 240;

describe('IgxSimpleCombo', () => {
let fixture: ComponentFixture<any>;
Expand Down Expand Up @@ -718,9 +718,9 @@ describe('IgxSimpleCombo', () => {
expect(focusedItem_1.classList.contains(CSS_CLASS_FOCUSED)).toBeTruthy();

// Change focus
dropdown.navigateItem(6);
dropdown.navigateItem(5);
fixture.detectChanges();
const focusedItem_2 = dropdownItems[5];
const focusedItem_2 = dropdownItems[4];
expect(focusedItem_2.classList.contains(CSS_CLASS_FOCUSED)).toBeTruthy();
expect(focusedItem_1.classList.contains(CSS_CLASS_FOCUSED)).toBeFalsy();
});
Expand Down
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