我有一个FormGroup,它具有三个FormControl字段和一个FormArray字段,如下图所示。要求是从用户那里获取经理名称,然后按下添加按钮,经理详细信息应显示在表中。在表中提供了一个删除按钮,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formArray逻辑外,其他一切都正常。
我试图在线解决此问题(以下各种链接:-https://alligator.io/angular/reactive-forms-formarray-dynamic-fields/, Angular 4 Form FormArray Add a Button to add or delete a form input row),但并没有太大帮助。关于如何在formGroup中存储formArray的材料并不多。请提出建议。
下面是我的代码,请看一下:-
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>
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")
}
}
表中未显示经理姓名,并且我不断出现以下错误:-
错误错误:找不到路径为'manager_formArray->的控件 setUpControl的_throwError(forms.js:1731)的“ MgrName” (forms.js:1639)在 FormGroupDirective.push ../ node_modules/@angular/forms/fesm5/forms.js.FormGroupDirective.addControl (forms.js:4456)在 FormControlName.push ../ node_modules/@angular/forms/fesm5/forms.js.FormControlName._setUpControl (forms.js:4961)在 FormControlName.push ../ node_modules/@angular/forms/fesm5/forms.js.FormControlName.ngOnChanges (forms.js:4911)位于checkAndUpdateDirectiveInline(core.js:9031) 在checkAndUpdateNodeInline(core.js:10299)在 在debugCheckAndUpdateNode上检查checkAndUpdateNode(core.js:10261) (core.js:10894)位于debugCheckDirectivesFn(core.js:10854) addPM manager-create-modal.component.ts:50之后的列表 另外:[对象对象],[对象对象] 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被添加到manager_formArray中。请帮帮我。
答案 0 :(得分:3)
您遇到了一些问题。首先,最好将Input添加到FormGroup
-元素之外的FormArray
中,向您的<div formArrayName="manager_formArray">
添加更多this.mgrNameInput = new FormControl('');
。因此,我创建了一个新的FormControl Add
(有关更多详细信息,请参见StackBlitz)。
当您按下addPM()
按钮并调用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.
}
方法时,还需要将消息添加到新条目中:
removeMgr(index: number){
this.manager_formArray.removeAt(index);
}
在删除条目时,我还添加了删除方法。
export interface Bar {
A?: string;
B: number; // int32
C: string; // date-time
Baz?: Baz;
}
export interface Baz {
D: number; // decimal
Color: Color;
}
/**
*
*/
export type Color = 0 | 1 | 2;
请检查StackBlitz以获取完整示例