我无法使用Angular8使用角度材料选择形式动态显示数据。我的代码如下。
product.componet.html:
<form [formGroup]="productForm" (submit)="saveProduct($event)" novalidate>
<mat-form-field appearance="outline" class="col-lg-4 col-md-6 col-sm-12">
<mat-label>Product Name</mat-label>
<input matInput placeholder="Product Name" aria-label="Product Name" formControlName="Name" maxlength="70" required>
</mat-form-field>
<mat-form-field appearance="outline" class="col-lg-4 col-md-6 col-sm-12">
<mat-label>Gender</mat-label>
<mat-select
placeholder="Select Gender"
aria-label="Select Gender"
(selectionChange)="onGenderSelectionChanged($event)"
>
<mat-option *ngFor="let s of genders" [value]="s.Code">
<span *ngIf="!s.Code">
</span>
<span *ngIf="s.Code">
{{s.Name}}
</span>
</mat-option>
</mat-select>
</mat-form-field>
</form>
Product.componet.ts:
genders: any = [
'',
{
Code: "M",
Name: "Male"
},
{
Code: "F",
Name: "Female"
},
{
Code: "U",
Name: "Unisex"
}
];
this.productForm.setValue({
Name : String = 'Test product',
Gender: String = 'M(Male)'
})
我能够显示产品名称,但无法显示动态绑定的下拉值。我需要使用 Angular 8 动态显示下拉值。
发布的代码中很少有错误:
- 必须对
<mat-select>
控件的性别控制使用formControlName
:
前任:
Here
//////
<mat-select formControlName="Gender" placeholder="Select Gender" aria-label="Select Gender" (selectionChange)="onGenderSelectionChanged($event)">
<mat-option *ngFor="let s of genders" [value]="s.Code">
<span *ngIf="!s.Code"></span>
<span *ngIf="s.Code"> {{s.Name}}</span>
</mat-option>
</mat-select>
- 虽然为 FormGroup 设置值不需要指定数据类型,但
this.productForm.setValue({
Name : 'Test product',
Gender: 'M'
});
不是M(Male)
这与M
完全不同,您正在使用它来绑定 matselect 的值。
Working_Demo
不要选中尝试将值设置为 "
<span>
{{s.Name}}
</span>
而您的阵列为
genders: any = [
{
Code: "",
Name: ""
},
{
Code: "M",
Name: "Male"
},
{
Code: "F",
Name: "Female"
},
{
Code: "U",
Name: "Unisex"
}
];
设置垫子选择值
<mat-select placeholder="Select Gender" aria-label="Select Gender" (selectionChange)="onGenderSelectionChanged($event)" formControlName="Gender">
<mat-option *ngFor="let s of genders" [value]="s.Code">
<span *ngIf="!s.Code"></span>
<span *ngIf="s.Code">
{{s.Name}}
</span>
</mat-option>
</mat-select>
将表单控件名称添加到垫子选择标记
formControlName="Gender"