我有一个 FormGroup,其中包含三个 FormControl 字段和一个 FormArray 字段,如下图所示。要求是从用户处获取经理名称,一旦按下添加按钮,经理详细信息应显示在表中。表中提供了删除按钮,当按下删除按钮时,应从表和列表中删除管理器。提交表单后,应保存经理列表。除了 formArray 逻辑之外,一切正常。
我尝试在网上找到解决方案(遵循各种链接:- https://alligator.io/angular/reactive-forms-formarray-dynamic-fields/ , Angular 4 Form FormArray Add a Button to add or delete a form input row ),但没有多大帮助。关于如何在formGroup中存储formArray的资料并不多。请提出建议。
下面是我的代码,请看一下:-
<强>1。 manager-create-modal.component.html
<div>
<form [formGroup]="createForm" (ngSubmit)="onFormCreation()">
<div class="row">
<div class="column">
<div class="form-inline">
<div class="form-group">
<label for="remote_access_method">Remote Access Method: <font color="orange"> *</font> </label>
<input type="text" size='38' class="form-control" formControlName="remote_access_method" >
</div>
</div>
<br>
<div class="form-inline">
<div class="form-group">
<label for="status">Current Status: <font color="orange"> *</font> </label>
<input type="text" size='38' class="form-control" formControlName="status">
</div>
</div>
<br>
<div class="form-inline">
<div class="form-group">
<label for="secregid">Registration ID:<font color="orange"> *</font> </label>
<input type="text" size='38' class="form-control" formControlName="secregid">
</div>
</div>
<br><br>
<div class="form-inline">
<div class="form-group">
<br><br>
<div formArrayName="manager_formArray">
Enter name: <input type="text" class="form-control" formControlName="MgrName" size='50' >
<button type="button" class="btn btn-primary btn-sm" (click)="addPM()">Add</button>
<br><br>
<table class="table table-hover">
<tr><th>#</th><th>Manager Name</th><th>Remove</th></tr>
<tr *ngFor="let pm of createForm.get('manager_formArray').value; let id = index">
<td>{{id+1}}</td>
<td>{{pm.MgrName}}</td>
<td>
<span class="table-remove">
<button type="button" class="btn btn-primary btn-sm" (click)="removeMgr(id)">Remove</button>
</span>
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
<br>
</div>
<br><br>
<div class="form-group">
<button class="btn btn-primary">Submit</button>
</div>
</form>
</div>
<强>2。 manager-create-modal.component.ts
import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder, FormArray, FormControl, Validators } from '@angular/forms';
@Component({
selector: 'app-manager-create-modal',
templateUrl: './manager-create-modal.component.html',
styleUrls: ['./manager-create-modal.component.css']
})
export class ManagerCreateModalComponent implements OnInit {
createForm: FormGroup;
manager_formArray: FormArray;
remote_access_method: FormControl;
status: FormControl;
secregid: FormControl;
constructor(private formBuilder: FormBuilder) { }
createFormControls(){
this.remote_access_method = new FormControl('');
this.status = new FormControl('');
this.secregid = new FormControl('');
this.manager_formArray = new FormArray([ this.createItem() ]);
}
createItem(): FormGroup {
return this.formBuilder.group({
MgrName: ''
});
}
createFormVariables(){
this.createForm = new FormGroup({
remote_access_method : this.remote_access_method,
status : this.status,
secregid : this.secregid,
manager_formArray: this.manager_formArray,
})
}
ngOnInit() {
this.createFormControls();
this.createFormVariables();
}
addPM(mgr: any): void {
console.log("inside addPM");
this.manager_formArray.push(this.formBuilder.group({MgrName:''}));
console.log("list after addition:"+this.manager_formArray.value);
for(let i = 0; i < this.manager_formArray.length; i++) {
console.log(this.manager_formArray.at(i).value);
}
}
get managerFormArray() {
return this.manager_formArray.get('MgrName') as FormArray;
}
onFormCreation(){
console.log("success")
}
}
经理姓名未显示在表格中,我不断收到以下错误:-
ERROR Error: Cannot find control with path: 'manager_formArray -> MgrName' at _throwError (forms.js:1731) at setUpControl (forms.js:1639) at FormGroupDirective.push../node_modules/@angular/forms/fesm5/forms.js.FormGroupDirective.addControl (forms.js:4456) at FormControlName.push../node_modules/@angular/forms/fesm5/forms.js.FormControlName._setUpControl (forms.js:4961) at FormControlName.push../node_modules/@angular/forms/fesm5/forms.js.FormControlName.ngOnChanges (forms.js:4911) at checkAndUpdateDirectiveInline (core.js:9031) at checkAndUpdateNodeInline (core.js:10299) at checkAndUpdateNode (core.js:10261) at debugCheckAndUpdateNode (core.js:10894) at debugCheckDirectivesFn (core.js:10854) inside addPM manager-create-modal.component.ts:50 list after addition:[object Object],[object Object] manager-create-modal.component.ts:53 {MgrName: ""} manager-create-modal.component.ts:53 {MgrName: ""}
我什至不明白为什么元素没有添加到manager_formArray中。请帮帮我。
最佳答案
您有一些问题。首先,最好移动输入,增加更多 FormGroup
发送至您的FormArray
<div formArrayName="manager_formArray">
之外- 元素。我创建了一个新的 FormControl this.mgrNameInput = new FormControl('');
因此(请参阅 StackBlitz 了解更多详细信息)。
当您按 Add
时,您还需要将消息添加到新条目中。 -按钮,调用addPM()
-方法:
addPM(){ // removed the argument, using the controller inside the method instead.
this.manager_formArray.push(this.formBuilder.group({MgrName:this.mgrNameInput.value}));
this.mgrNameInput.reset(); // reset the input field.
}
我还在删除条目时添加了删除方法。
removeMgr(index: number){
this.manager_formArray.removeAt(index);
}
请检查StackBlitz完整示例
关于html - 无法在 FormGroup 中存储动态 FormArray,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53563159/