我有一个看起来像这样的表单：
@H_502_2@<form class="row" name="powerPlantSearchForm" (ngSubmit)="f.valid && searchPowerPlants()" #f="ngForm" novalidate>
<div class="form-group col-xs-3" >
<label for="powerPlantName">PowerPlant Name</label>
<input type="text" class="form-control-small" [ngClass]="{ 'has-error': f.submitted && !powerPlantName.valid }" name="powerPlantName" [(ngModel)]="model.powerPlantName" #powerPlantName="ngModel" />
</div>
<div class="form-group col-xs-3" >
<label for="powerPlantType">PowerPlant Type</label>
<select class="form-control" [(ngModel)]="model.powerPlantType" name="powerPlantType">
<option value="" disabled>--Select Type--</option>
<option [ngValue]="powerPlantType" *ngFor="let powerPlantType of powerPlantTypes">
{{ powerPlantType }}
</option>
</select>
</div>
<div class="form-group col-xs-3" >
<label for="organizationName">Organization Name</label>
<input type="text" class="form-control-small" name="powerPlantOrganization" [(ngModel)]="model.powerPlantOrg" #organizationName="ngModel" />
</div>
<div class="form-group col-xs-3" >
<label for="powerPlantStatus">PowerPlant Active Status</label>
<select class="form-control" [(ngModel)]="model.powerPlantStatus" name="powerPlantStatus">
<option value="" disabled>--Select Status--</option>
<option [ngValue]="powerPlantStatus" *ngFor="let powerPlantStatus of powerPlantStatuses">
{{ powerPlantStatus }}
</option>
</select>
</div>
<div class="form-group col-md-3 col-xs-4">
<button [disabled]="loading" class="btn btn-primary">Search</button>
<img *ngIf="loading" src="data:image/gif;base64,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" />
</div>
<div class="form-group col-md-3 col-xs-3">
<button class="btn btn-primary" (click)="f.reset()">Reset</button>
</div>
</form>
布局如下所示：
单击“重置”按钮时,下拉列表的默认值将消失 – 如下图所示.
即使在按下重置按钮后,如何确保保留默认值？
有任何想法吗？
解决方法
在id = -1的元素列表中有一个额外的值
@H_502_2@types:any[]=[
{id:-1,Name:'Select One'},{id:1,Name:'abc'},{id:2,Name:'abdfsdgsc'}
];
HTML看起来像
@H_502_2@<select [(ngModel)]="selectedElement.id"> <option *ngFor="let type of types" [ngValue]="type.id"> {{type.Name}}</option> </select>重置时
@H_502_2@reset(){ this.selectedElement = {id:-1,Name:'Select One'}; }