Javascript 从JSON数据的嵌套表单数组填充表单控件中的值
formObj具有componentDetails对象的数组,而该对象又具有ComponentArray的嵌套数组Javascript 从JSON数据的嵌套表单数组填充表单控件中的值,javascript,json,angular,angular2-forms,angular4-forms,Javascript,Json,Angular,Angular2 Forms,Angular4 Forms,formObj具有componentDetails对象的数组,而该对象又具有ComponentArray的嵌套数组 export class FormViewComponent implements OnInit { public callbackForm: FormGroup; formObj = { "componentDetails": [{ "component": [{ "value":
export class FormViewComponent implements OnInit {
public callbackForm: FormGroup;
formObj = {
"componentDetails": [{
"component": [{
"value": "Choice 1"
}, {
"value": "Choice 2"
}],
"cpv": "",
"label": "Description of Problem",
"type": "radio",
"mandatory": true
}]
};
loadObservableForm() {
this.formService.getData(this.id)
.subscribe(
(formObj) => {
this.formObj = formObj;
this.callbackForm = this._formBuild.group({
componentDetails: this._formBuild.array([])
});
this.addComponentDetails();
},
(err) => console.error(err),
() => console.log('observable complete')
);
}
addComponentDetails() {
const control = <FormArray> this.callbackForm.controls.componentDetails;
this.formObj.componentDetails.forEach(x => {
control.push(this.addControl(x));
});
}
addControl(x) {
const group = this._formBuild.group({
label: x.label,
cpv: x.cpv,
type: x.type,
mandatory: x.mandatory,
component: this._formBuild.array([this.addOptions(x)])
});
return group;
}
addOptions(z) {
const control = < FormArray > z.component;
z.component.forEach(y => {
control.push(this.addOptionRow(y.value));
});
}
addOptionRow(value) {
return this._formBuild.group({
value: value
});
}
}
导出类FormViewComponent实现OnInit{
公共调用表单:FormGroup;
formObj={
“组件详细信息”:[{
“组成部分”:[{
“值”:“选择1”
}, {
“值”:“选择2”
}],
“cpv”:“,
“标签”:“问题说明”,
“类型”:“收音机”,
“强制”:正确
}]
};
loadobserveform(){
this.formService.getData(this.id)
.订阅(
(formObj)=>{
this.formObj=formObj;
this.callbackForm=this.\u formBuild.group({
componentDetails:this.\u formBuild.array([])
});
this.addComponentDetails();
},
(错误)=>控制台错误(错误),
()=>console.log('observable complete')
);
}
addComponentDetails(){
const control=this.callbackForm.controls.componentDetails;
this.formObj.componentDetails.forEach(x=>{
control.push(this.addControl(x));
});
}
addControl(x){
const group=this.\u formBuild.group({
标签:x.label,
cpv:x.cpv,
类型:x.type,
强制性:x.强制性,
组件:this.\u formBuild.array([this.addOptions(x)])
});
返回组;
}
添加选项(z){
常数控制=z分量;
z、 component.forEach(y=>{
control.push(this.addOptionRow(y.value));
});
}
addOptionRow(值){
返回此。\u formBuild.group({
价值:价值
});
}
}
模板HTML:
<form [formGroup]="callbackForm">
<div>
<div formArrayName="componentDetails">
<div *ngFor="let question of callbackForm.controls.componentDetails.controls; let i = index;" [formGroupName]="i">
<div class="row">
<div class="col-md-12 panel-group panel-group--compressed">
<div class="panel panel--default">
<fieldset>
<div class="row" *ngIf="question.controls.type.value === 'radio'">
<div class="col-md-12">
<p>{{ question.controls.label.value }}</p>
<div formArrayName="component">
<div *ngFor="let answer of question.controls.component.controls; let j = index" [formGroupName]="j">
<label class="radio radio--alt radio--stacked">
<input type="radio" name="radio-stacked">
<span class="radio__input"></span>
<span class="radio__label">{{ answer.value }}</span>
</label>
</div>
</div>
</div>
</div>
</fieldset>
</div>
</div>
</div>
</div>
</div>
</div>
</form>
{{question.controls.label.value}
{{answer.value}}
问题:
在组件模板HTML中,我无法获取{{answer.value}的值。我尝试了answer.controls.value.value和answer.controls.value。什么都没用。question.controls.component.controls返回[Object Object]在表单数组中调用
addOptions
时遇到问题:
component: this._formBuild.array([this.addOptions(x)])
把它放在下面,这样就行了。我从代码中省略了addOptions
和addOptionRow
,而是应用了addControl
中的逻辑:
addControl(x){
const group=this.\u formBuild.group({
标签:x.label,
cpv:x.cpv,
类型:x.type,
强制性:x.强制性,
组件:this.\u formBuild.array([])
});
const ctrl=group.controls.component作为FormArray;
x、 component.forEach(y=>{
ctrl.push(此.\u formBuild.group({
值:y.value
}))
})
返回组;
}
您的模板在其他方面是正确的,但要显示标签,请执行以下操作:
{{answer.value.value}
而不是
{{answer.value}
这是一篇关于“嵌套模型驱动表单”的好文章:有一些plunkr,您可以使用它来测试您需要的解决方案。您是否尝试过使用
返回组
而不是问题。推送(组)
在addOption
方法中?很抱歉,返回组不起作用:(这段代码真的起作用了吗?当我尝试它时,formarray是null
?我通过调用API.console.log(controls)将formObj作为JSON获取)inside addComponentDetails返回FormArray。我在问题中添加了FormArray的屏幕截图。我无法在{{callbackForm.value | json}中获取收音机的selectedValue(选项1或选项2)为了在表单提交时发送selectedValue,我使用stackblitz将selectedValue与formObj一起添加,以捕获无线电选择。不确定这是否正确?您好@AJT82,您能告诉我如何在表单提交时获取selectedValue吗?谢谢!