FormArray不会打印在我的反应表单上

Question

我从Angular开始，在表单中设置FormArray非常困难。总之，我所做的是：

• 创建两个表单：main(valForm(和另一个动态创建的表单(holidaysForm(
• 将第二个表单的值复制到数组中
• 将数组的值加载到FormArray中

遵循代码：

.ts

let group = {}
this.holidaysForm = new FormGroup(group);
this.valForm = fb.group({
dentistId: [null, Validators.required],
initialHour: [null, Validators.required],
endHour: [null, Validators.required],
numberOfHolidays: [null],
appointmentsInterval: [null, Validators.required],
year: [null, Validators.required],
workDays: this.buildDays(),
holidays: this.buildHolidays()
});
buildDays() {
const values = this.workDays.map(v => new FormControl(false));    
return this.fb.array(values);
}
buildHolidays() {
if (typeof this.valForm !== 'undefined') {
let teste = Object.assign({}, this.holidaysForm.value);
this.holidays = new Array();
Object.values(teste).forEach((v) => {
this.holidays.push(v);
})
console.log(this.holidays);
const values = this.holidays.map((v)=> new FormControl(v));      
return this.fb.array(values);
}
}
dynamicForm(val) {
if (val > 365) {
val = 365;
this.valForm.patchValue({
numberOfHolidays: 365
})
}
const val_plus_one = parseInt(val) + 1
let i: number = val_plus_one;
if (i < this.oldNumber) {
do {
this.holidaysForm.get('holiday' + i.toString()).setValue(null);
this.holidaysForm.removeControl('holiday' + i.toString());
i++
} while (i <= this.oldNumber)
}
const numbers = Array(val).fill(val, 0, 365).map((_, idx) => idx + 1)
numbers.forEach((num) => {
const fc = new FormControl('', FormValidations.Calendar(this.valForm.get('year').value));
this.holidaysForm.addControl('holiday' + num.toString(), fc)
})
this.numberOfHolidays = numbers;
this.oldNumber = val;
}

.html

<div class="col-md-4 mda-form-group">
<input class="mda-form-control" type="number" min="0" max="365"
formControlName="numberOfHolidays"
(change)="dynamicForm(valForm.get('numberOfHolidays').value)" />
<label>Total de Feriados</label>
</div>
<div [formGroup]="holidaysForm">
<div class="mda-form-group" *ngFor="let num of numberOfHolidays">
<input class="mda-form-control" type="date" formControlName="holiday{{num}}" />
<label>Feriado {{num}}</label>
<app-error-msg [control]="holidaysForm.get('holiday'+num)" label="Feriado">
</app-error-msg>
</div>
</div>

理论上，代码运行良好，没有错误，问题是结果总是这样：

主窗体

Valores: 
{
"dentistId": null,
"initialHour": null,
"endHour": null,
"numberOfHolidays": 3,
"appointmentsInterval": null,
"year": null,
"workDays": [
false,
false,
false,
false,
false,
false,
false
],
"holidays": null
}

假日表格

{
"holiday1": "2020-01-01",
"holiday2": "2020-03-01",
"holiday3": "2020-02-01"
}

有人知道我可能做错了什么吗？谢天谢地，

Answer 1

问题似乎是，在将值放入holidaysForm之前，您正在使用它。因此，在创建要循环以创建数组的对象时，该对象将没有属性。

buildHolidays() {
if (typeof this.valForm !== 'undefined') {
let teste = Object.assign({}, this.holidaysForm.value);   // this line
this.holidays = new Array();
Object.values(teste).forEach((v) => {
this.holidays.push(v);
})
console.log(this.holidays);
const values = this.holidays.map((v)=> new FormControl(v));      
return this.fb.array(values);
}

}

我想知道如何在这个方法中使用值，使其全部工作。请记住，您总是可以在通过group.addControl('controlName', myFormArray);创建原始表单组后添加一个formArray

祝你好运，一如既往快乐编码