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[英]Angular2 Reactive forms - Set default value for form input field (input type=file)?
[英]How to patch or set value for particular input field in angular reactive forms
处理最初数据为空的反应性嵌套表单,因为数据来自对话框中的某些字段(当对话框关闭时)。
当数据可用而不导致表单重置时,我需要为表单的特定字段设置值。
这是有效载荷结构
data = {
name: "",
imagesList: [
{
imagePath: "",
imageDescription: [
{
language: "",
text: ""
}
]
},
],
}
对应的FormArray结构体供参考
在下面的代码中,** openImagesDialog()** 函数在对话框关闭后订阅时接收来自可观察响应的数据。
openImagesDialog(){
this.companyNewsDialogServiceService.imagesListDataRecieved.subscribe(res => {
console.log("imagetest",res)
this.modalResponseData = res
this.imageFilePath = this.modalResponseData.data.filepath
this.imageDescText = this.modalResponseData.data.text
this.imageFileName = this.modalResponseData.data.filename
console.log("imagedata", this.imageFilePath)
console.log("imageDescText", this.imageDescText)
this.data.imagesList.forEach(x => {
x.imagePath = this.imageFilePath
x.imageDescription.forEach(y => {
y.text = this.imageDescText
})
})
this.createAppForm = this.setFormGroup(this.data);
console.log("image-form-data", this.createAppForm.value)
})
this.companyNewsDialogServiceService.confirmImagesListDialog({
title: 'Images List',
description: 'Images List Description',
imageSrc: "",
modalFormData: this.companyNewsDialogServiceService.recivedFormData,
showText: true
});
}
下面的代码用于根据有效负载形成嵌套表单结构,其中我将 setFormGroup() 函数分配给 createAppForm (formgroup),例如 this.createAppForm = this.setFormGroup(this.data); 在构造函数内部
表格结构代码
get imagesListFormData(){
return <FormArray>this.createAppForm.get('imagesList')
}
getImageDescriptionFormData(index: number){
return <FormArray>this.imagesListFormData.at(index).get('imageDescription');
}
setImageDescription(data: any = null){
data = data || { language: null, text: null };
return this.fb.group({
language: [this.selectedLanguage, Validators.required],
text: [this.imageDescText, Validators.required],
});
}
setImagesList(data: any = null) {
data = data || { assetType: null, assetLink: null, filePath: null, description: null };
return this.fb.group({
imagePath: [this.imageFilePath, Validators.required],
imageDescription: this.fb.array(
data.imageDescription
? data.imageDescription.map((x: any) => this.setImageDescription(x))
: []
)
}
);
}
setFormGroup(data: any = null) {
// debugger
data = data || {imagesList: null};
return this.fb.group({
name: [''],
imagesList: this.fb.array(
data.imagesList ? data.imagesList.map((x: any) => this.setImagesList(x)): []
)
});
}
createCompanyNews(){
const formData = this.createAppForm.getRawValue();
console.log(formData)
let payload = formData
this.createCompanyNewsService.CreateCompanyNews(payload).subscribe((res: any) => {
console.log(res)
})
}
selectLanguage(language : any){
this.selectedLanguage = language;
console.log(this.selectedLanguage)
}
下面的代码是在** openImagesDialog()** 函数中订阅的服务文件,用于从下面的代码中接收数据
export class CompanyNewsDialogServiceService {
recivedFormData: any;
imagesListDataRecieved: Subject<CompanyNewsDialogServiceService> = new Subject();
constructor(private dialog : MatDialog) { }
confirmImagesListDialog(data: ConfirmDialogData) {
return this.dialog.open(UploadFileDialogComponent, {data}).afterClosed().subscribe(res =>{
this.recivedFormData = res;
console.log('formdata',this.recivedFormData)
this.imagesListDataRecieved.next(res) ;
});
}
}
目前我正在再次设置表单,因为数据来自对话框,由于表单重置,导致表单名称字段之前输入的数据丢失。 我知道那是错误的
我需要将 openImagesDialog() 函数内的值修补或设置为仅在有效负载的字段下方,我分别在 openImagesDialog() 函数内获取这些字段的数据。
最初,这些字段下方为空。 对话框关闭后,这些字段的数据来自对话框。
imagePath, imageDescription -> imagesList 数组的文本字段**
您可以根据您在以下函数中提供的有效负载结构设置值。 这不会创建表单重置并将值分配给各个字段的值。
从下次开始,尝试简单地回答这个问题,这个问题还不够简洁,无法回答您的结构。
openImagesDialog(){
this.companyNewsDialogServiceService.imagesListDataRecieved.subscribe(res => {
console.log("imagetest",res)
this.modalResponseData = res
this.imageFilePath = this.modalResponseData.data.filepath
this.imageDescText = this.modalResponseData.data.text
this.imageFileName = this.modalResponseData.data.filename
let getImagesList = <FormArray>this.createAppForm.get('imagesList')
console.log("imageListControl", getImagesList)
console.log("image",getImagesList.value)
getImagesList.value.forEach( (x: any) => {
x.imagePath = this.imageFilePath
x.imageDescription.forEach( (y: any) => {
y.text = this.imageDescText
})
})
})
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