如何使用 ngFor 从 Angular 中的数组对象访问键值
How to access key values from array object in Angular with ngFor
每次单击模块扩展面板时,都会对 API 进行 HTTP 调用,以获取特定模块可用的所有公司。
<mat-accordion *ngIf="modules">
<mat-expansion-panel *ngFor="let module of modules">
<mat-expansion-panel-header (click)="availableCompanies(module.module_name)">
<mat-panel-title>
{{module.module_name}}
</mat-panel-title>
</mat-expansion-panel-header>
HTTP 响应(可用公司):
{
"message": "Retrieved companies available to module",
"data": [
{ "co_code": "123", "name": "Company A" },
{ "co_code": "456", "name": "Company B" },
{ "co_code": "789", "name": "Company C" }
]
}
我的问题:
在每个模块扩展面板中,我想将可用的公司显示为清单。但是我无法访问对象的键值并迭代每个复选框。到目前为止,这是我尝试过的方法:
<mat-list dense>
<mat-list-item *ngFor="let vertical of companies | keys">
<mat-checkbox *ngFor="let company of companies[vertical]">
{{company.name}}
</mat-checkbox>
</mat-list-item>
</mat-list>
我想也许我需要改变我使用键管道或 ngFor 的方式?任何帮助或想法都会很棒,谢谢 :)
额外信息:
这是list.component.ts:
export class listComponent implements OnInit {
@Input() modules: Module[];
@Input() companies: Company[] = [];
constructor(
private rs: RecipientService, // has getAvailableCompanies http method
) { }
ngOnInit() {
}
availableCompanies(vertical: string) {
this.rs.getAvailableCompanies(this.recipient.email_address, vertical).subscribe(res => {
this.companies[vertical] = res;
console.log(res);
console.log(this.companies);
});
}
}
console.log(res):
(3) [
{ "co_code": "123", "name": "Company A" },
{ "co_code": "456", "name": "Company B" },
{ "co_code": "789", "name": "Company C" }
]
console.log(this.companies)
跟踪 modules/verticals 的点击次数。
如果扩展了两个模块(credit_cards 和存款),this.companies 存储 module_names(键)和每个可用的公司数组:
[credit_cards: Array(3), deposits: Array(4)]
您正在尝试使用 keyvalue
但语法错误,
你需要使用 keyvalue
而不是 keys
除非你有自定义管道声明。
<mat-list dense>
<mat-list-item *ngFor="let vertical of companies | keyvalue">
<mat-checkbox *ngFor="let company of companies[vertical]">
{{company.name}}
</mat-checkbox>
</mat-list-item>
</mat-list>
每次单击模块扩展面板时,都会对 API 进行 HTTP 调用,以获取特定模块可用的所有公司。
<mat-accordion *ngIf="modules">
<mat-expansion-panel *ngFor="let module of modules">
<mat-expansion-panel-header (click)="availableCompanies(module.module_name)">
<mat-panel-title>
{{module.module_name}}
</mat-panel-title>
</mat-expansion-panel-header>
HTTP 响应(可用公司):
{
"message": "Retrieved companies available to module",
"data": [
{ "co_code": "123", "name": "Company A" },
{ "co_code": "456", "name": "Company B" },
{ "co_code": "789", "name": "Company C" }
]
}
我的问题:
在每个模块扩展面板中,我想将可用的公司显示为清单。但是我无法访问对象的键值并迭代每个复选框。到目前为止,这是我尝试过的方法:
<mat-list dense>
<mat-list-item *ngFor="let vertical of companies | keys">
<mat-checkbox *ngFor="let company of companies[vertical]">
{{company.name}}
</mat-checkbox>
</mat-list-item>
</mat-list>
我想也许我需要改变我使用键管道或 ngFor 的方式?任何帮助或想法都会很棒,谢谢 :)
额外信息:
这是list.component.ts:
export class listComponent implements OnInit {
@Input() modules: Module[];
@Input() companies: Company[] = [];
constructor(
private rs: RecipientService, // has getAvailableCompanies http method
) { }
ngOnInit() {
}
availableCompanies(vertical: string) {
this.rs.getAvailableCompanies(this.recipient.email_address, vertical).subscribe(res => {
this.companies[vertical] = res;
console.log(res);
console.log(this.companies);
});
}
}
console.log(res):
(3) [
{ "co_code": "123", "name": "Company A" },
{ "co_code": "456", "name": "Company B" },
{ "co_code": "789", "name": "Company C" }
]
console.log(this.companies) 跟踪 modules/verticals 的点击次数。 如果扩展了两个模块(credit_cards 和存款),this.companies 存储 module_names(键)和每个可用的公司数组:
[credit_cards: Array(3), deposits: Array(4)]
您正在尝试使用 keyvalue
但语法错误,
你需要使用 keyvalue
而不是 keys
除非你有自定义管道声明。
<mat-list dense>
<mat-list-item *ngFor="let vertical of companies | keyvalue">
<mat-checkbox *ngFor="let company of companies[vertical]">
{{company.name}}
</mat-checkbox>
</mat-list-item>
</mat-list>