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styling_spec.ts
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styling_spec.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {CommonModule} from '@angular/common';
import {Component, ComponentFactoryResolver, ComponentRef, Directive, ElementRef, HostBinding, Input, NgModule, Renderer2, ViewChild, ViewContainerRef} from '@angular/core';
import {bypassSanitizationTrustStyle} from '@angular/core/src/sanitization/bypass';
import {ngDevModeResetPerfCounters} from '@angular/core/src/util/ng_dev_mode';
import {TestBed} from '@angular/core/testing';
import {getElementClasses, getElementStyles, getSortedClassName, getSortedStyle} from '@angular/core/testing/src/styling';
import {By, DomSanitizer, SafeStyle} from '@angular/platform-browser';
import {expect} from '@angular/platform-browser/testing/src/matchers';
import {ivyEnabled, modifiedInIvy, onlyInIvy} from '@angular/private/testing';
describe('styling', () => {
beforeEach(ngDevModeResetPerfCounters);
describe('apply in prioritization order', () => {
it('should perform static bindings', () => {
@Component({template: `<div class="STATIC" style="color: blue"></div>`})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
const [staticDiv] = fixture.nativeElement.querySelectorAll('div');
expect(getSortedClassName(staticDiv)).toEqual('STATIC');
expect(getSortedStyle(staticDiv)).toEqual('color: blue;');
});
it('should perform prop bindings', () => {
@Component({
template: `<div [class.dynamic]="true"
[style.color]="'blue'"
[style.width.px]="100"></div>`
})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(getSortedClassName(div)).toEqual('dynamic');
expect(getSortedStyle(div)).toEqual('color: blue; width: 100px;');
});
onlyInIvy('style merging is ivy only feature').it('should perform map bindings', () => {
@Component({
template: `<div [class]="{dynamic: true}"
[style]="{color: 'blue', width: '100px'}"></div>`
})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(getSortedClassName(div)).toEqual('dynamic');
expect(getSortedStyle(div)).toEqual('color: blue; width: 100px;');
});
onlyInIvy('style merging is ivy only feature')
.it('should perform interpolation bindings', () => {
@Component({
// TODO(misko): change `style-x` to `style` once #34202 lands
template: `<div class="static {{'dynamic'}}"
style.color="blu{{'e'}}"
style-x="width: {{'100'}}px"></div>`
})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(getSortedClassName(div)).toEqual('dynamic static');
expect(getSortedStyle(div)).toEqual('color: blue;');
});
onlyInIvy('style merging is ivy only feature').it('should support hostBindings', () => {
@Component({
template:
`<div my-host-bindings-2 my-host-bindings-1 class="STATIC" style="color: blue"></div>`
})
class Cmp {
}
@Directive({
selector: '[my-host-bindings-1]',
host: {'class': 'HOST_STATIC_1', 'style': 'font-family: "c1"'}
})
class Dir1 {
}
@Directive({
selector: '[my-host-bindings-2]',
host: {'class': 'HOST_STATIC_2', 'style': 'font-family: "c2"'}
})
class Dir2 {
}
TestBed.configureTestingModule({
declarations: [
// Order of directives in the template does not matter.
// Order of declarations matters as it determines the relative priority for overrides.
Dir1,
Dir2,
// Even thought component is at the end, it will still have lowest priority because
// components are special that way.
Cmp,
]
});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(getSortedClassName(div)).toEqual('HOST_STATIC_1 HOST_STATIC_2 STATIC');
expect(getSortedStyle(div)).toEqual('color: blue; font-family: c2;');
});
it('should support hostBindings inheritance', () => {
@Component({template: `<div my-host-bindings class="STATIC" style="color: blue;"></div>`})
class Cmp {
}
@Directive({host: {'class': 'SUPER_STATIC', 'style': 'font-family: "super"; width: "1px";'}})
class SuperDir {
}
@Directive({
selector: '[my-host-bindings]',
host: {'class': 'HOST_STATIC', 'style': 'font-family: "host font"'}
})
class Dir extends SuperDir {
}
TestBed.configureTestingModule({declarations: [Cmp, Dir]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(getSortedClassName(div))
.toEqual(ivyEnabled ? 'HOST_STATIC STATIC SUPER_STATIC' : 'HOST_STATIC STATIC');
// Browsers keep the '"' around the font name, but Domino removes it some we do search and
// replace. Yes we could do `replace(/"/g, '')` but that fails on android.
expect(getSortedStyle(div).replace('"', '').replace('"', ''))
.toEqual(
ivyEnabled ? 'color: blue; font-family: host font; width: 1px;' :
'color: blue; font-family: host font;');
});
onlyInIvy('style merging is ivy only feature')
.it('should apply template classes in correct order', () => {
@Component({
template: `
<div class="STATIC DELETE_MAP_A DELETE_PROP_B"
[class]="{foo: true, DELETE_MAP_A: false}"
[class.bar]="true"
[class.DELETE_PROP_B]="false"></div>
`
})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const classDiv = fixture.nativeElement.querySelector('div');
expect(getSortedClassName(classDiv)).toEqual('STATIC bar foo');
});
onlyInIvy('style merging is ivy only feature')
.it('should apply template styles in correct order', () => {
@Component({
template: `
<div style="width: 100px; height: 200px: color: red; background-color: yellow"
[style]="{width: '110px', height: null}"
[style.color]=" 'blue' "
[style.height.px]="undefined"></div>
`
})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const styleDiv = fixture.nativeElement.querySelector('div');
expect(getSortedStyle(styleDiv))
.toEqual('background-color: yellow; color: blue; width: 110px;');
});
it('should work with ngClass/ngStyle', () => {
@Component(
{template: `<div [ngClass]="['dynamic']" [ngStyle]="{'font-family': 'dynamic'}"></div>`})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(getSortedClassName(div)).toEqual('dynamic');
expect(getSortedStyle(div)).toEqual('font-family: dynamic;');
});
});
describe('css variables', () => {
onlyInIvy('css variables').it('should support css variables', () => {
// This test only works in browsers which support CSS variables.
if (!(typeof getComputedStyle !== 'undefined' && typeof CSS !== 'undefined' &&
typeof CSS.supports !== 'undefined' && CSS.supports('color', 'var(--fake-var)')))
return;
@Component({
template: `
<div [style.--my-var]=" '100px' ">
<span style="width: var(--my-var)">CONTENT</span>
</div>`
})
class Cmp {
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
// document.body.appendChild(fixture.nativeElement);
fixture.detectChanges();
const span = fixture.nativeElement.querySelector('span') as HTMLElement;
expect(getComputedStyle(span).getPropertyValue('width')).toEqual('100px');
});
});
modifiedInIvy('shadow bindings include static portion')
.it('should bind [class] as input to directive', () => {
// VE Behavior https://stackblitz.com/edit/angular-cycpsf
// IVY behavior is slightly different see next test with same name.
@Component({
template: `
<div class="s1" [class]=" 'd1' " dir-shadows-class-input></div>
<div class="s2 {{'d2'}}" dir-shadows-class-input></div>
`
})
class Cmp {
}
@Directive({selector: '[dir-shadows-class-input]'})
class DirectiveShadowsClassInput {
constructor(private elementRef: ElementRef) {}
@Input('class')
set klass(value: string) {
this.elementRef.nativeElement.setAttribute('shadow-class', value);
}
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveShadowsClassInput]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const [div1, div2] = fixture.nativeElement.querySelectorAll('div');
// Static value `class="s1"` is always written to the DOM.
expect(div1.className).toEqual('s1');
// VE passes the dynamic portion of `class` to the directive.
expect(div1.getAttribute('shadow-class')).toEqual('d1');
// Interpolation `class="s2 {{'d2'}}"` does not have a static portion and so no value is
// written to DOM.
expect(div2.className).toEqual('');
expect(div2.getAttribute('shadow-class')).toEqual('s2 d2');
});
onlyInIvy('shadow bindings include static portion')
.it('should bind [class] as input to directive', () => {
// VE Behavior https://stackblitz.com/edit/angular-cycpsf
// IVY behavior is slightly different see next test with same name.
@Component({
template: `
<div class="s1" [class]=" 'd1' " dir-shadows-class-input></div>
<div class="s2 {{'d2'}}" dir-shadows-class-input></div>
`
})
class Cmp {
}
@Directive({selector: '[dir-shadows-class-input]'})
class DirectiveShadowsClassInput {
constructor(private elementRef: ElementRef) {}
@Input('class')
set klass(value: string) {
this.elementRef.nativeElement.setAttribute('shadow-class', value);
}
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveShadowsClassInput]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const [div1, div2] = fixture.nativeElement.querySelectorAll('div');
// Static value `class="s1"` is always written to the DOM.
expect(div1.className).toEqual('s1');
// VE has weird behavior where it calls the @Input('class') with either `class="static` or
// `[class]="dynamic"` but never both. This is determined at compile time. Due to locality
// we don't know if `[class]` is coming if we see `class` only. So we need to combine the
// static and dynamic parte. This results in slightly different calling sequence, but should
// result in the same final DOM.
expect(div1.getAttribute('shadow-class')).toEqual('s1 d1');
expect(div2.className).toEqual('');
expect(div2.getAttribute('shadow-class')).toEqual('s2 d2');
});
onlyInIvy('shadow bindings include static portion')
.it('should bind [class] as input to directive when both static and falsy dynamic values are present',
() => {
@Component({
template: `
<div class="s1" [class]="classBinding" dir-shadows-class-input></div>
`
})
class Cmp {
classBinding: any = undefined;
}
@Directive({selector: '[dir-shadows-class-input]'})
class DirectiveShadowsClassInput {
constructor(private elementRef: ElementRef) {}
@Input('class')
set klass(value: string) {
this.elementRef.nativeElement.setAttribute('shadow-class', value);
}
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveShadowsClassInput]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(div.className).toEqual('s1');
expect(div.getAttribute('shadow-class')).toEqual('s1');
fixture.componentInstance.classBinding = null;
fixture.detectChanges();
expect(div.className).toEqual('s1');
expect(div.getAttribute('shadow-class')).toEqual('s1');
fixture.componentInstance.classBinding = false;
fixture.detectChanges();
expect(div.className).toEqual('s1');
expect(div.getAttribute('shadow-class')).toEqual('s1');
fixture.componentInstance.classBinding = {toString: () => 'd1'};
fixture.detectChanges();
expect(div.className).toEqual('s1');
expect(div.getAttribute('shadow-class')).toEqual('s1 d1');
});
modifiedInIvy('shadow bindings include static portion')
.it('should bind [style] as input to directive', () => {
// VE Behavior https://stackblitz.com/edit/angular-cycpsf
@Component({
template: `
<div style="color: red;" [style]=" 'width: 100px;' " dir-shadows-style-input></div>
`
})
class Cmp {
}
@Directive({selector: '[dir-shadows-style-input]'})
class DirectiveShadowsClassInput {
constructor(private elementRef: ElementRef) {}
@Input('style')
set style(value: string) {
this.elementRef.nativeElement.setAttribute('shadow-style', value);
}
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveShadowsClassInput]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(div.style.cssText).toEqual('color: red;');
// VE has weird behavior where it calls the @Input('class') with either `class="static` or
// `[class]="dynamic"` but never both. This is determined at compile time. Due to locality
// we
// don't know if `[class]` is coming if we see `class` only. So we need to combine the two
// This results in slightly different calling sequence, but should result in the same final
// DOM.
expect(div.getAttribute('shadow-style')).toEqual('width: 100px;');
});
onlyInIvy('shadow bindings include static portion')
.it('should bind [style] as input to directive', () => {
// VE Behavior https://stackblitz.com/edit/angular-cycpsf
@Component({
template: `
<div style="color: red;" [style]=" 'width: 100px;' " dir-shadows-style-input></div>
`
})
class Cmp {
}
@Directive({selector: '[dir-shadows-style-input]'})
class DirectiveShadowsClassInput {
constructor(private elementRef: ElementRef) {}
@Input('style')
set style(value: string) {
this.elementRef.nativeElement.setAttribute('shadow-style', value);
}
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveShadowsClassInput]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(div.style.cssText).toEqual('color: red;');
// VE has weird behavior where it calls the @Input('class') with either `class="static` or
// `[class]="dynamic"` but never both. This is determined at compile time. Due to locality
// we
// don't know if `[class]` is coming if we see `class` only. So we need to combine the two
// This results in slightly different calling sequence, but should result in the same final
// DOM.
expect(div.getAttribute('shadow-style')).toEqual('color: red; width: 100px;');
});
it('should prevent circular ExpressionChangedAfterItHasBeenCheckedError on shadow inputs', () => {
@Component({template: `<div class="s1" dir-shadows-class-input></div>`})
class Cmp {
}
@Directive({selector: '[dir-shadows-class-input]'})
class DirectiveShadowsClassInput {
@Input('class')
klass: string|undefined;
@HostBinding('class')
get hostClasses() { return `${this.klass} SUFFIX`; }
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveShadowsClassInput]});
const fixture = TestBed.createComponent(Cmp);
expect(() => fixture.detectChanges()).not.toThrow();
const div = fixture.nativeElement.querySelector('div');
expect(div.className).toEqual('s1 SUFFIX');
});
it('should recover from exceptions', () => {
@Component({
template: `
<div [id]="maybeThrow(id)">
<span my-dir [class]="maybeThrow(klass)" [class.foo]="maybeThrow(foo)"></span>
</div>
`
})
class Cmp {
id = 'throw_id';
klass: string|string[] = 'throw_klass';
foo = `throw_foo`;
maybeThrow(value: any) {
if (typeof value === 'string' && value.indexOf('throw') === 0) {
throw new Error(value);
}
return value;
}
}
let myDirHostBinding = false;
@Directive({selector: '[my-dir]'})
class MyDirective {
@HostBinding('class.myDir')
get myDir(): boolean {
if (myDirHostBinding === false) {
throw new Error('class.myDir');
}
return myDirHostBinding;
}
}
TestBed.configureTestingModule({declarations: [Cmp, MyDirective]});
const fixture = TestBed.createComponent(Cmp);
const cmp = fixture.componentInstance;
const div = fixture.nativeElement.querySelector('div');
const span = fixture.nativeElement.querySelector('span');
expect(() => fixture.detectChanges()).toThrowError(/throw_id/);
expect(div.id).toBeFalsy();
expectClass(span).toEqual({});
cmp.id = 'myId';
expect(() => fixture.detectChanges()).toThrowError(/throw_klass/);
expect(div.id).toEqual('myId');
expectClass(span).toEqual({});
cmp.klass = ['BAR'];
expect(() => fixture.detectChanges()).toThrowError(/throw_foo/);
expect(div.id).toEqual('myId');
expectClass(span).toEqual(ivyEnabled ? {BAR: true} : {});
cmp.foo = 'foo';
expect(() => fixture.detectChanges()).toThrowError(/class.myDir/);
expect(div.id).toEqual('myId');
expectClass(span).toEqual(ivyEnabled ? {BAR: true, foo: true} : {});
myDirHostBinding = true;
fixture.detectChanges();
expect(div.id).toEqual('myId');
expectClass(span).toEqual({BAR: true, foo: true, myDir: true});
});
it('should render inline style and class attribute values on the element before a directive is instantiated',
() => {
@Component({
template: `
<div directive-expecting-styling style="width:200px" class="abc xyz"></div>
`
})
class Cmp {
}
@Directive({selector: '[directive-expecting-styling]'})
class DirectiveExpectingStyling {
constructor(elm: ElementRef) {
const native = elm.nativeElement;
native.setAttribute('data-captured-width', native.style.width);
native.setAttribute('data-captured-classes', native.className);
}
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveExpectingStyling]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const element = fixture.nativeElement.querySelector('div');
expect(element.style.width).toEqual('200px');
expect(element.getAttribute('data-captured-width')).toEqual('200px');
expect(element.className.trim()).toEqual('abc xyz');
expect(element.getAttribute('data-captured-classes')).toEqual('abc xyz');
});
it('should only render the same initial styling values once before a directive runs', () => {
@Component({
template: `
<div directive-expecting-styling style="width:200px" class="abc"></div>
`
})
class Cmp {
}
@Directive({selector: '[directive-expecting-styling]'})
class DirectiveExpectingStyling {
constructor(elm: ElementRef) {
const native = elm.nativeElement;
native.style.width = '300px';
native.classList.remove('abc');
}
}
TestBed.configureTestingModule({declarations: [Cmp, DirectiveExpectingStyling]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const element = fixture.nativeElement.querySelector('div');
expect(element.style.width).toEqual('300px');
expect(element.classList.contains('abc')).toBeFalsy();
});
it('should ensure that static classes are assigned to ng-container elements and picked up for content projection',
() => {
@Component({
template: `
<project>
outer
<ng-container class="inner">
inner
</ng-container>
</project>
`
})
class MyApp {
}
@Component({
selector: 'project',
template: `
<div class="outer-area">
<ng-content></ng-content>
</div>
<div class="inner-area">
<ng-content select=".inner"></ng-content>
</div>
`
})
class ProjectCmp {
}
TestBed.configureTestingModule({declarations: [MyApp, ProjectCmp]});
const fixture = TestBed.createComponent(MyApp);
const element = fixture.nativeElement;
fixture.detectChanges();
const inner = element.querySelector('.inner-area');
expect(inner.textContent.trim()).toEqual('inner');
const outer = element.querySelector('.outer-area');
expect(outer.textContent.trim()).toEqual('outer');
});
it('should render initial styling for repeated nodes that a component host', () => {
@Component({
selector: '[comp]',
template: '',
})
class Comp {
}
@Component({
template: `
<ng-template ngFor [ngForOf]="items" let-item>
<p comp class="a">A</p>
</ng-template>
`
})
class App {
items = [1, 2, 3];
}
TestBed.configureTestingModule({
declarations: [App, Comp],
});
const fixture = TestBed.createComponent(App);
fixture.detectChanges();
expect(fixture.debugElement.queryAll(By.css('.a')).length).toBe(3);
});
it('should do nothing for empty style bindings', () => {
@Component({template: '<div [style.color]></div>'})
class App {
}
TestBed.configureTestingModule({declarations: [App]});
const fixture = TestBed.createComponent(App);
fixture.detectChanges();
expect(fixture.nativeElement.innerHTML).toBe('<div></div>');
});
it('should do nothing for empty class bindings', () => {
@Component({template: '<div [class.is-open]></div>'})
class App {
}
TestBed.configureTestingModule({declarations: [App]});
const fixture = TestBed.createComponent(App);
fixture.detectChanges();
expect(fixture.nativeElement.innerHTML).toBe('<div></div>');
});
it('should be able to bind zero', () => {
@Component({template: '<div #div [style.opacity]="opacity"></div>'})
class App {
@ViewChild('div') div !: ElementRef<HTMLElement>;
opacity = 0;
}
TestBed.configureTestingModule({declarations: [App]});
const fixture = TestBed.createComponent(App);
fixture.detectChanges();
expect(fixture.componentInstance.div.nativeElement.style.opacity).toBe('0');
});
it('should be able to bind a SafeValue to backgroundImage', () => {
@Component({template: '<div [style.backgroundImage]="image"></div>'})
class Cmp {
image !: SafeStyle;
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
const sanitizer: DomSanitizer = TestBed.inject(DomSanitizer);
fixture.componentInstance.image = sanitizer.bypassSecurityTrustStyle('url("#test")');
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div') as HTMLDivElement;
expect(div.style.backgroundImage).toBe('url("#test")');
onlyInIvy('perf counters').expectPerfCounters({
rendererSetStyle: 1,
tNode: 3,
});
});
it('should not write to the native element if a directive shadows the class input', () => {
// This ex is a bit contrived. In real apps, you might have a shared class that is extended
// both by components with host elements and by directives on template nodes. In that case, the
// host styles for the template directives should just be ignored.
@Directive({selector: 'ng-template[styleDir]', host: {'[style.display]': 'display'}})
class StyleDir {
display = 'block';
}
@Component({selector: 'app-comp', template: `<ng-template styleDir></ng-template>`})
class MyApp {
}
TestBed.configureTestingModule({declarations: [MyApp, StyleDir]});
TestBed.createComponent(MyApp).detectChanges();
});
it('should be able to bind a SafeValue to clip-path', () => {
@Component({template: '<div [style.clip-path]="path"></div>'})
class Cmp {
path !: SafeStyle;
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
const sanitizer: DomSanitizer = TestBed.inject(DomSanitizer);
fixture.componentInstance.path = sanitizer.bypassSecurityTrustStyle('url("#test")');
fixture.detectChanges();
const html = fixture.nativeElement.innerHTML;
// Note that check the raw HTML, because (at the time of writing) the Node-based renderer
// that we use to run tests doesn't support `clip-path` in `CSSStyleDeclaration`.
expect(html).toMatch(/style=["|']clip-path:\s*url\(.*#test.*\)/);
});
it('should support interpolations inside a class binding', () => {
@Component({
template: `
<div class="a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g{{seven}}h{{eight}}i{{nine}}j"></div>
<div class="a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g{{seven}}h{{eight}}i"></div>
<div class="a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g{{seven}}h"></div>
<div class="a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g"></div>
<div class="a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f"></div>
<div class="a{{one}}b{{two}}c{{three}}d{{four}}e"></div>
<div class="a{{one}}b{{two}}c{{three}}d"></div>
<div class="a{{one}}b{{two}}c"></div>
<div class="a{{one}}b"></div>
<div class="{{one}}"></div>
`
})
class Cmp {
one = '1';
two = '2';
three = '3';
four = '4';
five = '5';
six = '6';
seven = '7';
eight = '8';
nine = '9';
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
const instance = fixture.componentInstance;
fixture.detectChanges();
const divs = fixture.nativeElement.querySelectorAll('div');
expect(divs[0].getAttribute('class')).toBe('a1b2c3d4e5f6g7h8i9j');
expect(divs[1].getAttribute('class')).toBe('a1b2c3d4e5f6g7h8i');
expect(divs[2].getAttribute('class')).toBe('a1b2c3d4e5f6g7h');
expect(divs[3].getAttribute('class')).toBe('a1b2c3d4e5f6g');
expect(divs[4].getAttribute('class')).toBe('a1b2c3d4e5f');
expect(divs[5].getAttribute('class')).toBe('a1b2c3d4e');
expect(divs[6].getAttribute('class')).toBe('a1b2c3d');
expect(divs[7].getAttribute('class')).toBe('a1b2c');
expect(divs[8].getAttribute('class')).toBe('a1b');
expect(divs[9].getAttribute('class')).toBe('1');
instance.one = instance.two = instance.three = instance.four = instance.five = instance.six =
instance.seven = instance.eight = instance.nine = '';
fixture.detectChanges();
expect(divs[0].getAttribute('class')).toBe('abcdefghij');
expect(divs[1].getAttribute('class')).toBe('abcdefghi');
expect(divs[2].getAttribute('class')).toBe('abcdefgh');
expect(divs[3].getAttribute('class')).toBe('abcdefg');
expect(divs[4].getAttribute('class')).toBe('abcdef');
expect(divs[5].getAttribute('class')).toBe('abcde');
expect(divs[6].getAttribute('class')).toBe('abcd');
expect(divs[7].getAttribute('class')).toBe('abc');
expect(divs[8].getAttribute('class')).toBe('ab');
expect(divs[9].getAttribute('class')).toBeFalsy();
});
onlyInIvy('only Ivy supports style interpolation')
.it('should support interpolations inside a style binding', () => {
@Component({
template: `
<div style="content: "a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g{{seven}}h{{eight}}i{{nine}}j""></div>
<div style="content: "a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g{{seven}}h{{eight}}i""></div>
<div style="content: "a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g{{seven}}h""></div>
<div style="content: "a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f{{six}}g""></div>
<div style="content: "a{{one}}b{{two}}c{{three}}d{{four}}e{{five}}f""></div>
<div style="content: "a{{one}}b{{two}}c{{three}}d{{four}}e""></div>
<div style="content: "a{{one}}b{{two}}c{{three}}d""></div>
<div style="content: "a{{one}}b{{two}}c""></div>
<div style="content: "a{{one}}b""></div>
<div style="{{self}}"></div>
`
})
class Cmp {
self = 'content: "self"';
one = '1';
two = '2';
three = '3';
four = '4';
five = '5';
six = '6';
seven = '7';
eight = '8';
nine = '9';
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
const instance = fixture.componentInstance;
fixture.detectChanges();
const divs = fixture.nativeElement.querySelectorAll('div');
expect(divs[0].style.getPropertyValue('content')).toBe('"a1b2c3d4e5f6g7h8i9j"');
expect(divs[1].style.getPropertyValue('content')).toBe('"a1b2c3d4e5f6g7h8i"');
expect(divs[2].style.getPropertyValue('content')).toBe('"a1b2c3d4e5f6g7h"');
expect(divs[3].style.getPropertyValue('content')).toBe('"a1b2c3d4e5f6g"');
expect(divs[4].style.getPropertyValue('content')).toBe('"a1b2c3d4e5f"');
expect(divs[5].style.getPropertyValue('content')).toBe('"a1b2c3d4e"');
expect(divs[6].style.getPropertyValue('content')).toBe('"a1b2c3d"');
expect(divs[7].style.getPropertyValue('content')).toBe('"a1b2c"');
expect(divs[8].style.getPropertyValue('content')).toBe('"a1b"');
expect(divs[9].style.getPropertyValue('content')).toBe('"self"');
instance.one = instance.two = instance.three = instance.four = instance.five =
instance.six = instance.seven = instance.eight = instance.nine = instance.self = '';
fixture.detectChanges();
expect(divs[0].style.getPropertyValue('content')).toBe('"abcdefghij"');
expect(divs[1].style.getPropertyValue('content')).toBe('"abcdefghi"');
expect(divs[2].style.getPropertyValue('content')).toBe('"abcdefgh"');
expect(divs[3].style.getPropertyValue('content')).toBe('"abcdefg"');
expect(divs[4].style.getPropertyValue('content')).toBe('"abcdef"');
expect(divs[5].style.getPropertyValue('content')).toBe('"abcde"');
expect(divs[6].style.getPropertyValue('content')).toBe('"abcd"');
expect(divs[7].style.getPropertyValue('content')).toBe('"abc"');
expect(divs[8].style.getPropertyValue('content')).toBe('"ab"');
expect(divs[9].style.getPropertyValue('content')).toBeFalsy();
});
it('should support interpolations inside a class binding when other classes are present', () => {
@Component({template: '<div class="zero i-{{one}} {{two}} three"></div>'})
class Cmp {
one = 'one';
two = 'two';
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const classList = fixture.nativeElement.querySelector('div').classList;
expect(classList).toContain('zero');
expect(classList).toContain('i-one');
expect(classList).toContain('two');
expect(classList).toContain('three');
fixture.componentInstance.one = fixture.componentInstance.two = '';
fixture.detectChanges();
expect(classList).toContain('zero');
expect(classList).toContain('i-');
expect(classList).toContain('three');
expect(classList).not.toContain('i-one');
expect(classList).not.toContain('two');
});
it('should support interpolations inside a style property binding', () => {
@Component({
template: `
<div style.font-family="f{{one}}{{two}}{{three}}{{four}}{{five}}{{six}}{{seven}}{{eight}}{{nine}}"></div>
<div style.font-family="f{{one}}{{two}}{{three}}{{four}}{{five}}{{six}}{{seven}}{{eight}}"></div>
<div style.font-family="f{{one}}{{two}}{{three}}{{four}}{{five}}{{six}}{{seven}}"></div>
<div style.font-family="f{{one}}{{two}}{{three}}{{four}}{{five}}{{six}}"></div>
<div style.font-family="f{{one}}{{two}}{{three}}{{four}}{{five}}"></div>
<div style.font-family="f{{one}}{{two}}{{three}}{{four}}"></div>
<div style.font-family="f{{one}}{{two}}{{three}}"></div>
<div style.font-family="f{{one}}{{two}}"></div>
<div style.font-family="f{{one}}"></div>
<div style.width="{{singleBinding}}"></div>
`
})
class Cmp {
singleBinding: string|null = '1337px';
one = 1;
two = 2;
three = 3;
four = 4;
five = 5;
six = 6;
seven = 7;
eight = 8;
nine = 9;
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
const instance = fixture.componentInstance;
fixture.detectChanges();
const divs: NodeListOf<HTMLElement> = fixture.nativeElement.querySelectorAll('div');
expect(divs[0].style.fontFamily).toBe('f123456789');
expect(divs[1].style.fontFamily).toBe('f12345678');
expect(divs[2].style.fontFamily).toBe('f1234567');
expect(divs[3].style.fontFamily).toBe('f123456');
expect(divs[4].style.fontFamily).toBe('f12345');
expect(divs[5].style.fontFamily).toBe('f1234');
expect(divs[6].style.fontFamily).toBe('f123');
expect(divs[7].style.fontFamily).toBe('f12');
expect(divs[8].style.fontFamily).toBe('f1');
expect(divs[9].style.width).toBe('1337px');
instance.singleBinding = null;
instance.one = instance.two = instance.three = instance.four = instance.five = instance.six =
instance.seven = instance.eight = instance.nine = 1;
fixture.detectChanges();
expect(divs[0].style.fontFamily).toBe('f111111111');
expect(divs[1].style.fontFamily).toBe('f11111111');
expect(divs[2].style.fontFamily).toBe('f1111111');
expect(divs[3].style.fontFamily).toBe('f111111');
expect(divs[4].style.fontFamily).toBe('f11111');
expect(divs[5].style.fontFamily).toBe('f1111');
expect(divs[6].style.fontFamily).toBe('f111');
expect(divs[7].style.fontFamily).toBe('f11');
expect(divs[8].style.fontFamily).toBe('f1');
expect(divs[9].style.width).toBeFalsy();
});
it('should support interpolations when a style property has a unit suffix', () => {
@Component({template: '<div style.width.px="{{one}}{{three}}{{three}}7"></div>'})
class Cmp {
one = 1;
three = 3;
}
TestBed.configureTestingModule({declarations: [Cmp]});
const fixture = TestBed.createComponent(Cmp);
fixture.detectChanges();
const div = fixture.nativeElement.querySelector('div');
expect(div.style.width).toBe('1337px');
fixture.componentInstance.one = 2;
fixture.componentInstance.three = 6;
fixture.detectChanges();
expect(div.style.width).toBe('2667px');
});
it('should not write to a `class` input binding in the event that there is no static class value',
() => {
let capturedClassBindingCount = 0;
let capturedClassBindingValue: string|null|undefined = undefined;
let capturedMyClassBindingCount = 0;
let capturedMyClassBindingValue: string|null|undefined = undefined;
@Component({template: '<div [class]="c" [my-class-dir]="x"></div>'})
class Cmp {
c: any = null;
x = 'foo';
}
@Directive({selector: '[my-class-dir]'})
class MyClassDir {
@Input('class')
set classVal(v: string) {
capturedClassBindingCount++;
capturedClassBindingValue = v;
}
@Input('my-class-dir')