這篇文章給大家分享的是有關(guān)Angular中模板語法有哪些的內(nèi)容。小編覺得挺實用的,因此分享給大家做個參考,一起跟隨小編過來看看吧。
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test-interpolation.component.ts
@Component({ selector: 'app-test-interpolation', templateUrl: './test-interpolation.component.html', styleUrls: ['./test-interpolation.component.css'] }) export class TestInterpolationComponent implements OnInit { title = '插值表達式'; constructor() { } ngOnInit() { } getValue(): string { return '值'; } }
test-interpolation.component.html
基插值語法歡迎來到 {{title}}!
2+2 = {{2 + 2}}
調(diào)用方法{{getValue()}}
test-template-variables.component.ts
@Component({ selector: 'app-test-template-variables', templateUrl: './test-template-variables.component.html', styleUrls: ['./test-template-variables.component.css'] }) export class TestTempRefVarComponent implements OnInit { constructor() { } ngOnInit() { } public saveValue(value: string): void { console.log(value); } }
test-template-variables.component.html
模板變量{{templateInput.value}}
值綁定:[]
test-value-bind.component.ts
@Component({ selector: 'app-test-value-bind', templateUrl: './test-value-bind.component.html', styleUrls: ['./test-value-bind.component.css'] }) export class TestValueBindComponent implements OnInit { public imgSrc = './assets/imgs/1.jpg'; constructor() { } ngOnInit() { } }
test-value-bind.component.html
單向值綁定
事件綁定:()
test-event-bind-component.ts
@Component({ selector: 'app-test-event-binding', templateUrl: './test-event-binding.component.html', styleUrls: ['./test-event-binding.component.css'] }) export class TestEventBindingComponent implements OnInit { constructor() { } ngOnInit() { } public btnClick(event: any): void { console.log(event + '測試事件綁定!'); } }
test-event-bind.component.html
事件綁定
雙向綁定:[()]
test-twoway-binding.component.ts
@Component({ selector: 'app-test-twoway-binding', templateUrl: './test-twoway-binding.component.html', styleUrls: ['./test-twoway-binding.component.css'] }) export class TestTwowayBindingComponent implements OnInit { public fontSizePx = 14; constructor() { } ngOnInit() { } }
test-twoway-binding.component.html
雙向綁定 Resizable Text
font-resizer.component.ts
@Component({ selector: 'app-font-resizer', templateUrl: './font-resizer.component.html', styleUrls: ['./font-resizer.component.css'] }) export class FontResizerComponent implements OnInit { @Input() size: number | string; @Output() sizeChange = new EventEmitter(); constructor() { } ngOnInit() { } decrement(): void { this.resize(-1); } increment(): void { this.resize(+1); } resize(delta: number) { this.size = Math.min(40, Math.max(8, +this.size + delta)); this.sizeChange.emit(this.size); } }
font-resizer.component.html
這是子組件
*ngIf
test-ng-if.component.ts
@Component({ selector: 'app-test-ng-if', templateUrl: './test-ng-if.component.html', styleUrls: ['./test-ng-if.component.css'] }) export class TestNgIfComponent implements OnInit { isShow = true; constructor() { } ngOnInit() { } }
test-ng-if.component.html
*ngIf的用法顯示內(nèi)容
*ngFor
test-ng-for.component.ts
@Component({ selector: 'app-test-ng-for', templateUrl: './test-ng-for.component.html', styleUrls: ['./test-ng-for.component.css'] }) export class TestNgForComponent implements OnInit { races = [ {name: 'star'}, {name: 'kevin'}, {name: 'kent'} ]; constructor() { } ngOnInit() { } }
test-ng-for.component.html
*ngFor用法名字列表
- {{i}}-{{name.name}}
ngSwitch
test-ng-switch.component.ts
@Component({ selector: 'app-test-ng-switch', templateUrl: './test-ng-switch.component.html', styleUrls: ['./test-ng-switch.component.css'] }) export class TestNgSwitchComponent implements OnInit { status = 1; constructor() { } ngOnInit() { } }
test-ng-switch.component.html
ngSwitch用法Good
Bad
Exception
HTML 屬性與 DOM 屬性關(guān)系
少量的 HTML 屬性與 DOM 屬性之間有著一對一的映射關(guān)系, 如 id;
有些 HTML 屬性沒有對應(yīng)的 DOM 屬性, 如 colspan;
有些 DOM 屬性沒有對應(yīng)的 HTML 屬性, 如 textContent;
就算名字相同, HTML 屬性和 DOM 屬性也不是同一樣東西;
HTML 屬性的值指定了初始值, DOM 屬性的值表示當前值; HTML 屬性的值不可改變, DOM 屬性的值可以改變。
模板綁定是通過 DOM 屬性和事件來工作的, 而不是 HTML 屬性。
注意:插值表達式與屬性綁定是同一個東西, 插值表達式屬于 DOM 屬性綁定。
NgClass
test-ng-class.component.ts
@Component({ selector: 'app-test-ng-class', templateUrl: './test-ng-class.component.html', styleUrls: ['./test-ng-class.component.scss'] }) export class TestNgClassComponent implements OnInit { public currentClasses: {}; public canSave = true; public isUnchanged = true; public isSpecial = true; constructor() { } ngOnInit() { this.currentClasses = { 'saveable': this.canSave, 'modified': this.isUnchanged, 'special': this.isSpecial }; } }
test-ng-class.component.html
NgClass用法設(shè)置多個樣式
test-ng-class.component.less
.saveable { font-size: 18px; } .modified { font-weight: bold; } .special { background-color: #ff3300; }
NgStyle
test-ng-style.component.ts
@Component({ selector: 'app-test-ng-style', templateUrl: './test-ng-style.component.html', styleUrls: ['./test-ng-style.component.css'] }) export class TestNgStyleComponent implements OnInit { currentStyles: { }; canSave = false; isUnchanged = false; isSpecial = false; constructor() { } ngOnInit() { this.currentStyles = { 'font-style': this.canSave ? 'italic' : 'normal', 'font-weight': !this.isUnchanged ? 'bold' : 'normal', 'font-size': this.isSpecial ? '36px' : '12px' }; } }
test-ng-style.component.html
NgStyle用法用NgStyle批量修改內(nèi)聯(lián)樣式!
NgModel
test-ng-model.component.ts
@Component({ selector: 'app-test-ng-model', templateUrl: './test-ng-model.component.html', styleUrls: ['./test-ng-model.component.css'] }) export class TestNgModelComponent implements OnInit { name = 'kevin'; constructor() { } ngOnInit() { } }
test-ng-model.component.html
NgModel的用法ngModel只能用在表單類的元素上面
管道
Angular 內(nèi)置的常用管道:
uppercase 與 lowercase
uppercase 將字母轉(zhuǎn)換成大寫 {{‘a(chǎn)aa’ | uppercase}}
lowercase 將字母轉(zhuǎn)換成小寫 {{‘BBB’ | lowercase}}
Date
{{ birthday | date: ‘yyyy-MM-dd HH:mm:ss’}}
number
{{ pi | number: ‘2.2-2’}}
2.2-2: 表示是保留 2 位整數(shù)和 2 位小數(shù)。
2-2: 表示最少 2 位小數(shù),最大 2 位小數(shù)。
示例
test-pipe.component.ts
@Component({ selector: 'app-test-pipe', templateUrl: './test-pipe.component.html', styleUrls: ['./test-pipe.component.css'] }) export class TestPipeComponent implements OnInit { currentTime: Date = new Date(); str = 'aaa'; money = 34.567; constructor() { } ngOnInit() { window.setInterval( () => { this.currentTime = new Date() } , 1000); } }
test-pipe.component.html
管道的用法{{ currentTime | date:'yyyy-MM-dd HH:mm:ss' }}{{ str | uppercase }}{{ money | number: '2.2-2' }}
非空斷言
test-not-null-assert.component.ts
@Component({ selector: 'app-test-safe-nav', templateUrl: './test-not-null-assert.component.html', styleUrls: ['./test-not-null-assert.component.css'] }) export class TestSafeNavComponent implements OnInit { public currentValue: any = null; constructor() { } ngOnInit() { } }
test-not-null-assert.component.html
安全取值名字:{{currentValue?.name}}
感謝各位的閱讀!關(guān)于“Angular中模板語法有哪些”這篇文章就分享到這里了,希望以上內(nèi)容可以對大家有一定的幫助,讓大家可以學到更多知識,如果覺得文章不錯,可以把它分享出去讓更多的人看到吧!