fix(filter-field): Fixes an issue with inconsistent clearAll function…

…ality.

The clearAll button rendering depended on the filterfield not being
focussed. When the clearAll button was rendered and was clicked, the
cdkFocusMonitor kicked in, set the focus and removed the clearAll button
again. As a result the clearAll button lost its focus, the document
focus was set back to the body and the clearAll was rendered again. The
click event on the clearAll was never fired.
We no longer remove the clearAll from the DOM, but hide it via css
classes. This makes it not lose focus, and results in a more consistent
behavior.

Fixes #435

apps/components-e2e/src/components/filter-field/filter-field.e2e.ts

@@ -23,6 +23,7 @@ import {
   input,
   clearAll,
   filterTags,
+  setupSecondTestScenario,
 } from './filter-field.po';
 import { Selector } from 'testcafe';
 
@@ -76,3 +77,30 @@ test('should remove all filters when clicking the clear-all button', async (test
   await testController.wait(300);
   await testController.expect(await filterTags.exists).notOk();
 });
+
+test('should remove all removable filters when clicking the clear-all button', async (testController: TestController) => {
+  // Setup the second datasource.
+  await testController.click(setupSecondTestScenario);
+
+  // Wait for the filterfield to catch up.
+  await testController.wait(500);
+
+  // Manually set an option, because this seems to break the
+  // clear all change detection.
+  await clickOption(1);
+  await clickOption(1);
+
+  await testController.expect(await filterTags.count).eql(2);
+
+  // // Click somewhere outside so the clear-all button appears
+  await testController.click(Selector('.outside'));
+  // Wait for the filterfield to catch up.
+  await testController.wait(500);
+  await testController.expect(await clearAll.exists).ok();
+
+  // Click the clear all-button, the created filter should be removed
+  await testController.click(clearAll);
+  // Wait for the filterfield to catch up.
+  await testController.wait(500);
+  await testController.expect(await filterTags.count).eql(1);
+});

apps/components-e2e/src/components/filter-field/filter-field.html

@@ -6,3 +6,14 @@
   label="Filter by"
   clearAllLabel="Clear all"
 ></dt-filter-field>
+
+<button id="switchToFirstDatasource" (click)="switchToDatasource(0)">
+  Switch to first datasource
+</button>
+<button id="switchToSecondDatasource" (click)="switchToDatasource(1)">
+  Switch to second datasource
+</button>
+
+<button id="setupSecondTestScenario" (click)="setupSecondTestScenario()">
+  setupSecondTestScenario
+</button>

apps/components-e2e/src/components/filter-field/filter-field.po.ts

@@ -24,6 +24,10 @@ export const filterTags = Selector('dt-filter-field-tag');
 
 export const input = Selector('input');
 
+export const switchToFirstDatasource = Selector('#switchToFirstDatasource');
+export const switchToSecondDatasource = Selector('#switchToSecondDatasource');
+export const setupSecondTestScenario = Selector('#setupSecondTestScenario');
+
 export async function clickOption(
   nth: number,
   testController?: TestController,

apps/components-e2e/src/components/filter-field/filter-field.ts

@@ -17,15 +17,16 @@
 // tslint:disable no-lifecycle-call no-use-before-declare no-magic-numbers deprecation
 // tslint:disable no-any max-file-line-count no-unbound-method use-component-selector
 
-import { Component } from '@angular/core';
+import { Component, ViewChild, ChangeDetectorRef } from '@angular/core';
 import { Validators } from '@angular/forms';
 
 import {
   DtFilterFieldDefaultDataSource,
   DtFilterFieldDefaultDataSourceType,
+  DtFilterField,
 } from '@dynatrace/barista-components/filter-field';
 
-const TEST_DATA: DtFilterFieldDefaultDataSourceType = {
+const TEST_DATA = {
   autocomplete: [
     {
       name: 'custom normal',
@@ -57,10 +58,75 @@ const TEST_DATA: DtFilterFieldDefaultDataSourceType = {
   ],
 };
 
+const TEST_DATA_2 = {
+  autocomplete: [
+    {
+      name: 'AUT',
+      distinct: true,
+      autocomplete: ['Linz', 'Vienna', 'Graz'],
+    },
+    {
+      name: 'USA',
+      autocomplete: [
+        'San Francisco',
+        'Los Angeles',
+        'New York',
+        { name: 'Custom', suggestions: [] },
+      ],
+    },
+    {
+      name: 'Requests per minute',
+      range: {
+        operators: {
+          range: true,
+          equal: true,
+          greaterThanEqual: true,
+          lessThanEqual: true,
+        },
+        unit: 's',
+      },
+    },
+  ],
+};
+
+const DATA = [TEST_DATA, TEST_DATA_2];
+
 @Component({
   selector: 'dt-e2e-filter-field',
   templateUrl: './filter-field.html',
 })
 export class DtE2EFilterField {
-  _dataSource = new DtFilterFieldDefaultDataSource<any>(TEST_DATA);
+  _dataSource = new DtFilterFieldDefaultDataSource<
+    DtFilterFieldDefaultDataSourceType
+  >(DATA[0]);
+
+  @ViewChild(DtFilterField, { static: true }) _filterfield: DtFilterField<
+    DtFilterFieldDefaultDataSourceType
+  >;
+
+  switchToDatasource(targetIndex: number): void {
+    this._dataSource = new DtFilterFieldDefaultDataSource<
+      DtFilterFieldDefaultDataSourceType
+    >(DATA[targetIndex]);
+  }
+
+  constructor(private _changeDetectorRef: ChangeDetectorRef) {}
+
+  setupSecondTestScenario(): void {
+    this._dataSource = new DtFilterFieldDefaultDataSource(DATA[1]);
+    const linzFilter = [
+      DATA[1].autocomplete[0],
+      DATA[1].autocomplete[0].autocomplete![0],
+    ];
+
+    this._filterfield.filters = [linzFilter];
+    this._filterfield.currentTags.subscribe(() => {
+      const linzTag = this._filterfield.getTagForFilter(linzFilter);
+      if (linzTag) {
+        linzTag.editable = false;
+        linzTag.deletable = false;
+        this._changeDetectorRef.markForCheck();
+      }
+    });
+  }
 }

components/filter-field/src/filter-field.html

@@ -20,7 +20,8 @@
     variant="secondary"
     class="dt-filter-field-clear-all-button"
     (click)="_clearAll()"
-    *ngIf="_showClearAll"
+    *ngIf="clearAllLabel"
+    [class.dt-filter-field-clear-all-button-hidden]="!_showClearAll"
   >{{clearAllLabel}}</button>
 
   <div class="dt-filter-field-infix">

components/filter-field/src/filter-field.scss

@@ -110,6 +110,11 @@ button.dt-filter-field-clear-all-button {
   margin-left: 8px;
 }
 
+button.dt-filter-field-clear-all-button-hidden {
+  visibility: hidden;
+  position: absolute;
+}
+
 // We need to double the class to get a better specificity
 // than the original autocomplete panel selector
 ::ng-deep .dt-autocomplete-panel.dt-filter-field-panel.dt-filter-field-panel {

components/filter-field/src/filter-field.spec.ts

@@ -1611,7 +1611,8 @@ describe('DtFilterField', () => {
     });
 
     it('should not display the clear all button if no filters are set', () => {
-      expect(getClearAll(fixture)).toBeNull();
+      // Check if the clear all is initially not visible.
+      expect(isClearAllVisible(fixture)).toBe(false);
 
       const autocompleteFilter = [
         TEST_DATA_EDITMODE.autocomplete[0],
@@ -1622,7 +1623,8 @@ describe('DtFilterField', () => {
       filterField.filters = [autocompleteFilter];
       fixture.detectChanges();
 
-      expect(getClearAll(fixture)).not.toBeNull();
+      // After setting the filters, there should be a clear all button visible.
+      expect(isClearAllVisible(fixture)).toBe(true);
     });
 
     // the user is in the edit mode of a filter
@@ -1641,7 +1643,7 @@ describe('DtFilterField', () => {
       zone.simulateZoneExit();
       fixture.detectChanges();
 
-      expect(getClearAll(fixture)).toBeNull();
+      expect(isClearAllVisible(fixture)).toBe(false);
     });
 
     // the user is in the edit mode of a filter
@@ -1664,7 +1666,7 @@ describe('DtFilterField', () => {
       const autOption = options[0];
       autOption.click();
 
-      expect(getClearAll(fixture)).toBeNull();
+      expect(isClearAllVisible(fixture)).toBe(false);
     });
 
     it('should not display the clear all button if no label is provided', () => {
@@ -1678,7 +1680,7 @@ describe('DtFilterField', () => {
       fixture.componentInstance.clearAllLabel = '';
       fixture.detectChanges();
 
-      expect(getClearAll(fixture)).toBeNull();
+      expect(isClearAllVisible(fixture)).toBe(false);
     });
 
     it('should reset the entire filter field', () => {
@@ -2094,20 +2096,28 @@ function getTagButtons(
   return { label, deleteButton };
 }
 
-// tslint:disable-next-line:no-any
 function getInput(fixture: ComponentFixture<any>): HTMLInputElement {
   return fixture.debugElement.query(By.css('.dt-filter-field-input'))
     .nativeElement;
 }
 
-// tslint:disable-next-line:no-any
+/** Get the clearAll button. */
 function getClearAll(fixture: ComponentFixture<any>): HTMLButtonElement | null {
   const dbgEl = fixture.debugElement.query(
     By.css('.dt-filter-field-clear-all-button'),
   );
   return dbgEl ? dbgEl.nativeElement : null;
 }
 
+/** Get the clearAll button and evaluate if it is visible or not. */
+function isClearAllVisible(fixture: ComponentFixture<any>): boolean {
+  const clearAll = getClearAll(fixture);
+  return (
+    clearAll !== null &&
+    !clearAll.classList.contains('dt-filter-field-clear-all-button-hidden')
+  );
+}
+
 @Component({
   selector: 'test-app',
   template: `