Angular Don';如果FORMARY为空或未定义为被动形式,则不显示FORMARY
我刚开始学习Angular 4做我的第一个项目 我创建了一个反应式表单,以显示具有以下结构的表单:Angular Don';如果FORMARY为空或未定义为被动形式,则不显示FORMARY,angular,typescript,angular-reactive-forms,Angular,Typescript,Angular Reactive Forms,我刚开始学习Angular 4做我的第一个项目 我创建了一个反应式表单,以显示具有以下结构的表单: Form (FormGroup) | --> aggLevels (FormArray) | --> aggregationLevelName (FormControl? I show it in a label) | --> variableDataForLevel (FormArray)
Form (FormGroup)
|
--> aggLevels (FormArray)
|
--> aggregationLevelName (FormControl? I show it in a label)
|
--> variableDataForLevel (FormArray)
|
--> variableDataId (FormControl)
|
--> value (FormControl)
这是HTML组件:
<form [formGroup]="varDataForm" (ngSubmit)="onSubmit()" novalidate>
<div formArrayName="aggLevels"
*ngFor="let agLevel of varDataForm.get('aggLevels')?.controls; let aggLevelId = index;">
<div [formGroupName]="aggLevelId">
<label>{{agLevel?.get('aggregationLevelName')?.value}}</label>
<div formArrayName="variableDataForLevel"
*ngFor="let vardata of varDataForm.get('aggLevels')?.controls[0]?.get('variableDataForLevel')?.controls; let rowIndex = index;">
<div [formGroupName]="rowIndex">
<select formControlName="variableDataId">
<option *ngFor="let gs1 of gs1AIs" [value]="gs1.Id">{{gs1.description}}</option>
</select>
<input formControlName="value" placeholder="Valor">
<div class="error" *ngIf="vardata.get('value').hasError('required') && vardata.get('value').touched">
Obligatorio
</div>
</div>
</div>
</div>
</div>
</form>
但我还是有问题。FORMARYaggrevels
和variableDataForLevel
不是未定义的,因为当我创建它时,我引用了它
如果表格是空的,我怎么做才能不显示表格
我刚学过Angular,对如何修复它知之甚少
这是此组件的组件typescript类:
import { Component, Inject } from '@angular/core';
import { FormBuilder, FormGroup, FormArray, FormControl, Validators } from '@angular/forms';
import { Http, RequestOptions, Headers } from '@angular/http';
import { IProductionOrder } from '../../interfaces/productionorder.interface';
import { IAggLevel } from '../../interfaces/aglevel.interface';
import { IGS1 } from '../../interfaces/gs1.interface';
import { IVarData } from '../../interfaces/vardata.interface';
@Component({
selector: 'vardata',
templateUrl: './vardata.component.html'
})
export class VarDataComponent {
public productionorders: IProductionOrder[];
public gs1AIs: IGS1[];
public varDataForm: FormGroup = new FormGroup({});
public selectedProductionOrder: string;
constructor(private http: Http,
@Inject('BASE_URL') private baseUrl: string,
@Inject(FormBuilder) private fb: FormBuilder) {
this.selectedProductionOrder = '';
http.get(baseUrl + 'api/ProductionOrder/0').subscribe(result => {
this.productionorders = result.json() as IProductionOrder[];
console.log(this.productionorders);
}, error => console.error(error));
}
productionOrderChanges() {
if (this.selectedProductionOrder != '') {
let urlVarData: string = this.baseUrl + 'api/VariableData/' + this.selectedProductionOrder;
let urlAggLevel: string = this.baseUrl + 'api/AggregationLevelConfiguration/' + this.selectedProductionOrder;
this.http.get(urlAggLevel).subscribe(result => {
let aggLevels: IAggLevel[] = result.json() as IAggLevel[];
console.log('niveles');
console.log(aggLevels);
if ((aggLevels != null) && (aggLevels.length > 0)) {
this.http.get(urlVarData).subscribe(result => {
let varDatas: IVarData[] = result.json() as IVarData[];
console.log('variable data');
console.log(varDatas);
this.varDataForm = this.fb.group({
aggLevels: this.fb.array(this.createForm(aggLevels, varDatas))
});
}, error => console.error(error));
}
}, error => console.error(error));
}
else
this.varDataForm = new FormGroup({});
}
createForm(aggLevels: IAggLevel[], varDatas: IVarData[]): any[] {
let array: any[] = [];
for (let level of aggLevels) {
let group: FormGroup;
let varDataForLevel: IVarData[] =
varDatas.filter(v => v.aggregationLevelConfigurationId == level.aggregationLevelConfigurationId);
group = this.createFormGroupForLevel(level, varDataForLevel);
array.push(group);
}
return array;
}
createFormGroupForLevel(level: IAggLevel, varDatas: IVarData[]): FormGroup {
let group: FormGroup;
group = this.fb.group({
aggregationLevelName: level.name,
variableDataForLevel: this.fb.array(this.createVarDataControls(varDatas))
});
return group;
}
createVarDataControls(varData: IVarData[]): any[] {
let array: any[] = [];
for (let vData of varData) {
let group: FormGroup;
group = this.fb.group({
variableDataId: vData.variableDataId,
value: vData.value
});
array.push(group);
}
return array;
}
disableSubmit() {
return (!this.varDataForm.valid);
}
onSubmit() {
}
}
我认为问题在于:
createVarDataControls(varData: IVarData[]): any[] {
let array: any[] = [];
for (let vData of varData) {
let group: FormGroup;
group = this.fb.group({
variableDataId: vData.variableDataId,
value: vData.value
});
array.push(group);
}
return array;
}
如果varData
为空,它将返回一个Any[]
,但我不认为return这是一个错误,因为我不想在表单上显示空的内容
如果varData
为空,我编辑了方法createVarDataControls
以返回FormGroup
。这让我继续,但我不认为它回答了我的问题:
createVarDataControls(varData: IVarData[]): any[] {
let array: any[] = [];
if ((varData == null) || (varData.length == 0)) {
let group: FormGroup;
group = this.fb.group({
variableDataId: '',
value: ''
});
array.push(group);
}
else {
for (let vData of varData) {
let group: FormGroup;
group = this.fb.group({
variableDataId: vData.variableDataId,
value: vData.value
});
array.push(group);
}
}
return array;
}
有了它,我没有得到任何异常,但它显示了两个空控件,我不希望这样。这仅用于确定问题。我已找到问题。我想我的解决方案,如果它可以帮助别人 在第二个
FormArray
循环中:
<div formArrayName="variableDataForLevel"
*ngFor="let vardata of varDataForm.get('aggLevels')?.controls[0]?.get('variableDataForLevel')?.controls; let rowIndex = index;">
尝试失败,直到找到解决方案 能否在组件中初始化窗体及其控件的位置添加代码?thanks@amal我已经用我正在使用的Typescript类更新了这个问题。
<div formArrayName="variableDataForLevel"
*ngFor="let vardata of varDataForm.get('aggLevels')?.controls[0]?.get('variableDataForLevel')?.controls; let rowIndex = index;">
<div formArrayName="variableDataForLevel"
*ngFor="let vardata of agLevel.get('variableDataForLevel')?.controls; let rowIndex = index;">
createVarDataControls(varData: IVarData[]): any[] | undefined {
let array: any[] = [];
if ((varData == null) || (varData.length == 0)) {
return undefined;
}
else {
for (let vData of varData) {
let group: FormGroup;
group = this.fb.group({
aggregationLevelConfigurationId: vData.aggregationLevelConfigurationId,
productionOrderId: vData.productionOrderId,
variableDataId: vData.variableDataId,
value: vData.value
});
array.push(group);
}
return array;
}
}