Javascript Angular 2导出类:需要声明或语句
我正试着把我的头绕在棱角分明的方向上。在我的代码示例中,我试图模拟ngIf功能。所以我有一个app.mycustomdirective.ts文件:Javascript Angular 2导出类:需要声明或语句,javascript,angular,angular2-directives,Javascript,Angular,Angular2 Directives,我正试着把我的头绕在棱角分明的方向上。在我的代码示例中,我试图模拟ngIf功能。所以我有一个app.mycustomdirective.ts文件: import { Directive, Input, TemplateRef, ViewContainerRef } from '@angular/core'; @Directive({ selector: '[my-custom-if]' }) export class MyCustomIfDirective { construct
import { Directive, Input, TemplateRef, ViewContainerRef } from '@angular/core';
@Directive({
selector: '[my-custom-if]'
})
export class MyCustomIfDirective {
constructor(
private templateRef: TemplateRef<any>,
private viewContainer: ViewContainerRef) { }
@Input() set my-custom-if(condition: boolean) {
if (condition) {
this.viewContainer.createEmbeddedView(this.templateRef);
} else {
this.viewContainer.clear();
}
}
}
最后,我将其添加到我的组件中:
import { Component } from '@angular/core';
@Component({
selector: 'my-app',
template: `<h2 *my-custom-if="condition">Hello {{name}}</h2>
<button (click)="condition = !condition">Click</button>`,
})
export class AppComponent {
name = 'Angular';
condition = false;
}
我不知道发生了什么。有人有线索吗?错误来自以下方面:
@Input() set my-custom-if(condition: boolean) { // error
^ ^ ^
你可以试试这个:
@Input() myCustomIf: boolean;
init () {
if (this.myCustomIf) {
// your code here
}
}
然后将this.init调用到构造函数中
按此步骤进行操作。函数名中不能有“-”
@Input() set my-custom-if(condition: boolean) { // error
^ ^ ^
@Input() myCustomIf: boolean;
init () {
if (this.myCustomIf) {
// your code here
}
}