问题描述
https://stackblitz.com/edit/angular-ivy-dynamicfrm1?file=angular.json
我正在尝试根据下拉值的变化动态添加/删除控件 但由于某些原因,验证未触发并且表单提交按钮未禁用
有人可以看看吗?
<form [formGroup]="dynamicForm">
<select formControlName="selectCtrl">
<option>Select</option>
<option value="add"> Add Mandatory TextBox</option>
<option value="remove"> Remove Mandatory TextBox </option>
<option> Some Input</option>
</select>
<div *ngIf="showDfield">
<input formControlName="dynamicTextControl"
type="text">
</div>
<div>
<button type="sumit"
class="btn btn-primary"
[disabled]="!dynamicForm.valid">Submit</button>
</div>
</form>
addDynamicForm() {
console.log("addDynamicForm ");
let dCtrl = new FormControl("dynamicTextControl");
this.dynamicGroup.addControl("dynamicTextControl",dCtrl);
dCtrl.setValidators(Validators.required);
dCtrl.updateValueAndValidity();
}
removeDynamicForm() {
this.dynamicGroup.removeControl("dynamicTextControl");
}
解决方法
在堆叠闪电战中,您有一个在代码背后定义的嵌套表单组,但没有模板。更新模板以匹配定义表单的方式后,有效性将正确更新。
这是您在Stackblitz中定义表单的方式:
this.dynamicForm = this.fb.group({
selectCtrl: "Select",dynamicGroup: this.fb.group({}) //this is where you are adding the dynamic control
});
您的函数将控件附加到子组
addDynamicForm() {
console.log("addDynamicForm ");
let dCtrl = new FormControl("dynamicTextControl");
//right here is where you append to the sub-group
this.dynamicGroup.addControl("dynamicTextControl",dCtrl);
dCtrl.setValidators(Validators.required);
dCtrl.updateValueAndValidity();
}
以下是更正后的模板以及forked stackblitz:
<form [formGroup]="dynamicForm">
<select formControlName="selectCtrl" >
<option>Select</option>
<option value="add" > Add Mandatory TextBox</option>
<option value="remove"> Remove Mandatory TextBox </option>
<option> Some Input</option>
</select>
<!-- here's your nested group! -->
<div [formGroup]="dynamicGroup">
<div *ngIf="showDfield">
<input formControlName="dynamicTextControl" type="text" >
</div>
</div>
<div>
<button type="sumit" class="btn btn-primary" [disabled]="!dynamicForm.valid" >Submit</button>
</div>
</form>