Angular 如何在从下拉列表中选择自定义选项后启用输入文本框?
JSON数据Angular 如何在从下拉列表中选择自定义选项后启用输入文本框?,angular,typescript,angular-material,angular5,Angular,Typescript,Angular Material,Angular5,JSON数据 loginValue: any[] = [ { value: 'col-1', viewValue: 'facebook' }, { value: 'col-2', viewValue: 'google' }, { value: 'col-1', viewValue: 'Custom' } ]; HTML {{loginvalue.viewValue}} 您需要的是模型绑定到变量:[(ngModel)]=“selectedValue”并在禁用属性中
loginValue: any[] = [
{ value: 'col-1', viewValue: 'facebook' },
{ value: 'col-2', viewValue: 'google' },
{ value: 'col-1', viewValue: 'Custom' }
];
HTML
{{loginvalue.viewValue}}
您需要的是模型绑定到变量:[(ngModel)]=“selectedValue”
并在禁用属性中使用该变量。然后像这样检查禁用属性
[disabled]="selectedValue.viewValue!=='Custom'"
请注意:[value]=“loginvalue”
检查示例,您将找到ngmodel示例
这是我更改的代码
<mat-form-field>
<mat-select placeholder="login Value" [(ngModel)]="selectedValue" [disabled]="isDisabled1">
<mat-option *ngFor="let loginvalue of loginValue" [value]="loginvalue">
{{loginvalue.viewValue}}
</mat-option>
</mat-select>
</mat-form-field>
<div class="col-md-2">
<mat-form-field class="Custom">
<input matInput placeholder="Enter Custom Value" [disabled]="selectedValue.viewValue!=='Custom'">
</mat-form-field>
</div>
{{loginvalue.viewValue}}
您可以尝试使用反应式表单,方法是订阅所选选项,并操作启用/禁用输入控件 TS:
changeState() {
this.form.get('logintype').valueChanges
.subscribe(res => {
if (res === "Custom") { this.form.get('customInput').enable() }
else { this.form.get('customInput').disable() }
});
}
<form [formGroup]="form">
<mat-form-field>
<mat-select formControlName="logintype" placeholder="Select an option" (selectionChange)="changeState()">
<mat-option *ngFor="let option of loginValue" [value]="option.viewValue">
{{ option.viewValue }}
</mat-option>
</mat-select>
</mat-form-field>
<mat-form-field>
<input matInput formControlName="customInput" type="text">
</mat-form-field>
</form>
HTML:
changeState() {
this.form.get('logintype').valueChanges
.subscribe(res => {
if (res === "Custom") { this.form.get('customInput').enable() }
else { this.form.get('customInput').disable() }
});
}
<form [formGroup]="form">
<mat-form-field>
<mat-select formControlName="logintype" placeholder="Select an option" (selectionChange)="changeState()">
<mat-option *ngFor="let option of loginValue" [value]="option.viewValue">
{{ option.viewValue }}
</mat-option>
</mat-select>
</mat-form-field>
<mat-form-field>
<input matInput formControlName="customInput" type="text">
</mat-form-field>
</form>
{{option.viewValue}}
下面是@shreBatale上的示例代码,很抱歉,我没有正确保存stackblitz,新的更改使其更加简单,请检查OutError错误:formControlName必须与父formGroup指令一起使用。您需要添加一个formGroup指令并向其传递一个现有的formGroup实例(您可以在类中创建一个)。@您可以编辑stackblitz并告诉我问题出在哪里吗?我想您需要在构造函数中初始化fromControlName