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我不断收到以下控制台错误:尝试差异''的错误。只有阵列和iterables允许
Error trying to diff 'Paul'. Only arrays and iterables are allowed
HTML:
<fieldset class="one-quarter sm-padding">
<label>Occupation</label>
<select name="occupations"
[(ngModel)]="occupations"
(ngModelChange)="showValuePromptText('Occupation', $event)">
<option *ngFor="let occupation of occupations"
[value]="occupation">
{{occupation}}
</option>
</select>
</fieldset>
TS:
import { Component } from '@angular/core';
import { PromptService } from '../../services/prompt.service';
import { IPromptText } from "../../models/IPromptText";
@Component({
selector: 'fact-find',
templateUrl: './factfind.component.html',
styleUrls: ['./factfind.component.css'],
providers: [PromptService]
})
export class FactFindComponent {
promptTexts: IPromptText[];
currentPromptText : string;
showDefaultPromptText(fieldName: string) {
if (fieldName != null) {
this.promptService.fetchPrompts(fieldName, '').subscribe(
(data) => this.currentPromptText = data
);
}
}
showValuePromptText(fieldName: string, fieldValue: string) {
if (fieldValue != null) {
this.promptService.fetchPrompts(fieldName, fieldValue).subscribe(
(data) => this.currentPromptText = data
);
}
}
occupations: string[] = ["John", "Paul", "George", "Ringo"];
}
如果有人可以提供一些线索点亮我如何解决这个问题将不胜感激。