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[英]I can use an interface in the html component but not in the typescript
[英]TypeScript can't manage to use dictionary interface
我對 TypeScript 比較陌生,它一直抱怨變量的類型為“未知”,所以我決定創建一個接口來解決這個問題。 但我無法找到有效的解決方案。 這是我到目前為止所帶來的:
我想使用的數據來自 json,看起來像這個數據。json,這個 json 被簡化了很多:
{
"userName":"usernamedummy",
"projects":{
"key1":{
"projname":"dummyname0",
"layers":{
"keyinside1":{
"layername":"dummylayername0",
}
}
},
"key2":{
"projname":"dummyname",
"layers":{
"keyinside2":{
"layername":"dummylayername"
}
}
}
}
我的主要組件如下所示:
import { Component, Input, Output, EventEmitter } from '@angular/core';
import data from './data.json';
export interface Project {
[key: string]: {
projname: string;
layers: {
[key: string]: {
layername: string;
};
};
};
}
@Component({
selector: 'app-layers',
templateUrl: './layers.component.html',
styleUrls: ['./layers.component.less'],
})
export class LayersComponent {
layerListSource: Project;
constructor() {
this.layerListSource = data.projects;
}
}
並使用另一個組件執行 *ngFor,如下所示:
<li *ngFor="let project of layerListSource| keyvalue">
<app-layer-dropdown [project]="project"></app-layer-dropdown>
</li>
在另一個組件中,它看起來像這樣:
import { Component, Input, OnInit } from '@angular/core';
import { Project } from '../layers.component';
@Component({
selector: 'app-layer-dropdown',
templateUrl: './layer-dropdown.component.html',
styleUrls: ['./layer-dropdown.component.less'],
})
export class LayerDropdownComponent implements OnInit {
@Input() project!: Project;
open: boolean;
constructor() {
this.open = false;
}
ngOnInit(): void {
console.log(this.project)
}
}
KeyValuePipe 將您的列表轉換為鍵/值對,因此您需要綁定到該值:
<li *ngFor="let project of layerListSource| keyvalue">
<app-layer-dropdown [project]="project.value"></app-layer-dropdown>
</li>
請參閱https://angular.io/api/common/KeyValuePipe以供參考。
[編輯] 另外,在您的圖層組件中,您可能必須更改接口,因為您綁定的不是字典,而是字典的值:
export interface LayerDict {
[key: string]: {
layername: string;
};
}
export interface Project {
projname: string;
layers: LayerDict;
}
export interface ProjectDict {
[key: string]: Project ;
}
// LayersComponent
layerListSource: ProjectDict;
// LayerDropdownComponent
@Input() project!: Project;
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