我想将我的枚举显示为字符串,但它显示为数字。
我从Web服务接收json对象并将其映射到我的typescript对象
getProperties(): Observable<Property[]> {
return this.http.get<Property[]>(this.getallagentsproperties + '1');
}
export enum LetType {
Notspecified = 0,
LongTerm = 1,
ShortTerm = 2,
Commercial = 4
}
export class Property {
...other stuff...
letType: LetType;
...other stuff...
}
我的组件拨打电话并将其添加到相关属性
import { Component, OnInit } from '@angular/core';
import { Property } from './Property';
import { PropertyService } from '../properties.service';
@Component({
selector: 'app-properties',
templateUrl: './properties.component.html',
})
export class PropertiesComponent implements OnInit {
properties: Property[];
constructor(private propertyService: PropertyService) { }
ngOnInit() {
this.getProperties()
}
getProperties(): void {
this.propertyService.getProperties()
.subscribe(p => this.properties = p);
}
}
当我在模板中显示{{property.letType}}
时显示:
4
我希望它显示商业
我尝试按照我添加的模板中找到的答案here
{{LetType[property.letType]}}
在我的Componant中我添加了
LetType = this.LetType;
但我总是在控制台中得到以下错误
无法读取未定义的属性'4'
我做错了什么?
答案 0 :(得分:5)
您无需在此处创建管道。这是我的答案。
let-type.enum.ts
export enum LetType{
Type1 = 1,
Type2 = 2,
Type3 = 3,
Type4 = 4
}
property.model.ts
export interface Property{
...other stuff...
letType: LetType;
...other stuff...
}
properties.component.ts
import { Component, OnInit } from '@angular/core';
import { Property} from './property.model';
import { LetType} from './let-type.enum';
import { PropertyService } from '../properties.service';
@Component({
selector: 'app-properties',
templateUrl: './properties.component.html',
})
export class PropertiesComponent implements OnInit {
properties: Property[] = [];
LetType = LetType;
constructor(private propertyService: PropertyService) { }
ngOnInit() {
this.getProperties();
}
getProperties() {
this.propertyService.getProperties().subscribe(result => {
this.properties = result
});
}
}
然后在您的html中
<ng-container matColumnDef="columnName">
<th mat-header-cell *matHeaderCellDef >Types</th>
<td mat-cell *matCellDef="let element">{{LetType[element.letType]}}</td>
</ng-container>
答案 1 :(得分:2)
您可以在不使用管道的情况下执行此操作:
LetType : typeof
LetType = LetType ;
,并在html页面中:
<td mat-cell *matCellDef="let element">{{LetType[element.letType]}}</td>
和以前一样。
答案 2 :(得分:0)
感谢@Harry Ninh的评论,我能够解决我的问题。
{{property.letType}}
显示0
我希望它显示My Enum Value
注意:我没有在我的问题中要求拆分框,但是我已经提供了这个,因为我觉得很多人将枚举显示为字符串值可能会发现它很有用
步骤1在组件中添加所需的枚举(在我的情况下为LetType)
import { Component, OnInit, Type } from '@angular/core';
import { Property, LetType} from './Property';
import { PropertyService } from '../properties.service';
@Component({
selector: 'app-properties',
templateUrl: './properties.component.html',
})
export class PropertiesComponent implements OnInit {
properties: Property[];
LetType = LetType;
constructor(private propertyService: PropertyService) { }
ngOnInit() {
this.getProperties();
}
getProperties(): void {
this.propertyService.getProperties()
.subscribe(p => this.properties = p);
}
}
步骤2创建自定义管道以将您的号码转换为字符串
import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
name: 'eNumAsString'
})
export class ENumAsStringPipe implements PipeTransform {
transform(value: number, enumType: any): any {
return enumType[value].split(/(?=[A-Z])/).join().replace(",", " ");;
}
}
步骤3将管道添加到表格
...other html table tags...
<td>{{property.letType | eNumAsString:LetType}}</td>
...other html table tags...