Angular 按顺序获取不同指令的数组
我想按照模板中指定的顺序从视图(或内容)中获取一些指令 尝试1[]Angular 按顺序获取不同指令的数组,angular,Angular,我想按照模板中指定的顺序从视图(或内容)中获取一些指令 尝试1[] @指令({selector:'dir-1'})类Dir1{} @指令({selector:'dir-2'})类Dir2{} @指令({selector:'dir-3'})类Dir3{} @组成部分({ 选择器:“我的应用程序”, 模板:` `, }) 导出类应用程序{ @ViewChildren(Dir1)Dir1; @ViewChildren(Dir2)dir2s; @ViewChildren(Dir3)Dir3; ngAft
@指令({selector:'dir-1'})类Dir1{}
@指令({selector:'dir-2'})类Dir2{}
@指令({selector:'dir-3'})类Dir3{}
@组成部分({
选择器:“我的应用程序”,
模板:`
`,
})
导出类应用程序{
@ViewChildren(Dir1)Dir1;
@ViewChildren(Dir2)dir2s;
@ViewChildren(Dir3)Dir3;
ngAfterViewInit(){
console.log(this.dir1s、this.dir2s、this.dir3s);
}
}
通过简单地使用不同的指令,我失去了它们的顺序
尝试2[]
@指令({selector:'general'})类general{}
@指令({selector:'[specific-1]})类Specific1{}
@指令({selector:'[specific-2]})类Specific2{}
@指令({selector:'[specific-3]})类Specific3{}
@组成部分({
选择器:“我的应用程序”,
模板:`
`,
})
导出类应用程序{
@儿童(将军)将军;
ngAfterViewInit(){
console.log(this.generals);
}
}
通过使用“通用”选择器,我不再知道指令的类型,如文档所述
获取组件引用在角度上有点棘手
因此,您可以尝试以下技巧:
export abstract class BaseSpecific { }
const provideSpecific = (component: BaseSpecific) => {
return { provide: BaseSpecific, useExisting: forwardRef(() => component) };
};
@Directive({ selector: '[specific-1]', providers: [provideSpecific(Specific1)] }) export class Specific1 implements BaseSpecific { }
@Directive({ selector: '[specific-2]', providers: [provideSpecific(Specific2)] }) export class Specific2 implements BaseSpecific { }
@Directive({ selector: '[specific-3]', providers: [provideSpecific(Specific3)] }) export class Specific3 implements BaseSpecific { }
@Directive({ selector: 'general' })
export class General {
constructor(@Self() public specificClass: BaseSpecific) { }
}
@Component({
selector: 'my-app',
template: `
<general specific-1></general>
<general specific-2></general>
<general specific-3></general>
`
})
export class AppComponent {
@ViewChildren(General) generals: QueryList<General>;
ngAfterViewInit() {
console.log(this.generals.map(x => x.specificClass.constructor.name));
}
}
导出抽象类BaseSpecific{}
const provideSpecific=(组件:BaseSpecific)=>{
返回{provide:BaseSpecific,useExisting:forwardRef(()=>component)};
};
@指令({selector:'[specific-1]',providers:[providesspecific(Specific1)]})导出类Specific1实现BaseSpecific{}
@指令({selector:'[specific-2]',providers:[providesspecific(Specific2)]})导出类Specific2实现BaseSpecific{}
@指令({selector:'[specific-3]',providers:[providesspecific(specific 3)]})导出类specific 3实现BaseSpecific{}
@指令({selector:'general'})
出口类一般{
构造函数(@Self()public specific类:BaseSpecific){}
}
@组成部分({
选择器:“我的应用程序”,
模板:`
`
})
导出类AppComponent{
@查看儿童(一般)将军:QueryList;
ngAfterViewInit(){
log(this.generals.map(x=>x.specificClass.constructor.name));
}
}
是否要获取
Specific1、Specific2、Specific3
?是的,我希望生成的数组以正确的顺序包含特定类型的对象。
@Directive({selector: 'general'}) class General {}
@Directive({selector: '[specific-1]'}) class Specific1 {}
@Directive({selector: '[specific-2]'}) class Specific2 {}
@Directive({selector: '[specific-3]'}) class Specific3 {}
@Component({
selector: 'my-app',
template: `
<general specific-1></general>
<general specific-2></general>
<general specific-3></general>
`,
})
export class App {
@ViewChildren(General) generals;
ngAfterViewInit() {
console.log(this.generals);
}
}
export abstract class BaseSpecific { }
const provideSpecific = (component: BaseSpecific) => {
return { provide: BaseSpecific, useExisting: forwardRef(() => component) };
};
@Directive({ selector: '[specific-1]', providers: [provideSpecific(Specific1)] }) export class Specific1 implements BaseSpecific { }
@Directive({ selector: '[specific-2]', providers: [provideSpecific(Specific2)] }) export class Specific2 implements BaseSpecific { }
@Directive({ selector: '[specific-3]', providers: [provideSpecific(Specific3)] }) export class Specific3 implements BaseSpecific { }
@Directive({ selector: 'general' })
export class General {
constructor(@Self() public specificClass: BaseSpecific) { }
}
@Component({
selector: 'my-app',
template: `
<general specific-1></general>
<general specific-2></general>
<general specific-3></general>
`
})
export class AppComponent {
@ViewChildren(General) generals: QueryList<General>;
ngAfterViewInit() {
console.log(this.generals.map(x => x.specificClass.constructor.name));
}
}