Javascript 角度8组件未渲染
当前情景Javascript 角度8组件未渲染,javascript,angular,angular8,Javascript,Angular,Angular8,当前情景 带有文本框和文本区域的角度组件(角度8) 使用命令“build”生成的组件:“ng build--prod--output hashing=none”“(在package.json中) 然后将输出的min文件复制到另一个包含HTML文件的外部文件夹 使用生成的零部件标记显示零部件 问题 当“formControlName”用于绑定文本框的值时(在Angular项目中),角度组件未在HTML页面中呈现 如何使用“formGroup”和“formControlName”实现表单,然后
- 带有文本框和文本区域的角度组件(角度8)
- 使用命令“build”生成的组件:“ng build--prod--output hashing=none”“(在package.json中)
- 然后将输出的min文件复制到另一个包含HTML文件的外部文件夹
- 使用生成的零部件标记显示零部件
- 当“formControlName”用于绑定文本框的值时(在Angular项目中),角度组件未在HTML页面中呈现
- 如何使用“formGroup”和“formControlName”实现表单,然后应该能够在外部HTML文件中使用该组件
<--------html code-->
<div>
<form [formGroup]="generalRequestForm" (ngSubmit)="onSubmit()">
<div class="mb-15 form-group">
<select class="custom-select" formControlName="requests" id="requests" ngDefaultControl>
<option value="">Select Request Type</option>
<option *ngFor="let request of requests; let i = index" [value]="requests[i].id">
{{requests[i].name}}
</option>
</select>
</div>
<div class="mb-15 form-group">
<input type="text" class="form-control" placeholder="Item" formControlName="item" ngDefaultControl
autocomplete="off" />
<div *ngIf="invalidItem" class="error">This field cannot be empty.</div>
</div>
<div class="mb-15 form-group">
<textarea class="form-control comments" placeholder="Comments" formControlName="comments"
ngDefaultControl autocomplete="off"></textarea>
<div *ngIf="invalidComments" class="error">This field cannot be empty.</div>
</div>
<div class="row align-items-center remember"></div>
<div class="form-group">
<button class="btn float-right submit_btn">Submit</button>
<div *ngIf="invalidLogin" class="error">Invalid credentials.</div>
</div>
</form>
</div>
**<-------ts code------->**
export class GeneralRequestComponent implements OnInit {
generalRequestForm: FormGroup;
invalidLogin: boolean = false;
invalidItem: boolean = false;
submitSuccess: boolean = false;
invalidComments: boolean = false;
requests;
constructor(
private formBuilder: FormBuilder,
private router: Router,
private apiService: ApiService
) {
this.generalRequestForm = new FormGroup({
item: new FormControl('', Validators.required),
comments: new FormControl('', Validators.required),
requests: new FormControl('', Validators.required),
})
of(this.getRequestType()).subscribe(requests => {
this.requests = requests;
this.generalRequestForm.controls.requests.patchValue(this.requests[0].id);
});
}
onSubmit() {
console.log("item...", this.generalRequestForm)
if (!this.generalRequestForm.controls.item.value) {
this.invalidItem = true;
return;
}
else if (!this.generalRequestForm.controls.comments.value) {
this.invalidComments = true;
return;
}
else {
alert("Your response has been recorded. Administrator would reach you before the time.")
return;
}
if (this.generalRequestForm.invalid) {
return;
}
const loginPayload = {
item: this.generalRequestForm.controls.item.value,
comments: this.generalRequestForm.controls.comments.value
};
this.apiService.login(loginPayload).subscribe(data => {
if (data.status === 200) {
window.localStorage.setItem('token', data.token);
this.router.navigate(['home']);
} else {
this.invalidLogin = true;
alert(data.message);
}
});
}
ngOnInit() {
// window.localStorage.removeItem('token');
// this.generalRequestForm = this.formBuilder.group({
// item: ['', Validators.compose([Validators.required])],
// comments: ['', Validators.required],
// requests: ['', Validators.required]
// });
}
getRequestType() {
return [
{ id: '1', name: 'Parking Slot' },
{ id: '2', name: 'Meal Card' },
{ id: '3', name: 'Infopark Sticker' },
{ id: '4', name: 'Address Proof' },
{ id: '5', name: 'Form 16' },
{ id: '6', name: 'Time Entry' },
{ id: '7', name: 'Other Request' }
];
}
}
选择请求类型
{{请求[i].name}
此字段不能为空。
此字段不能为空。
提交
无效的凭据。
****
导出类GeneralRequestComponent实现OnInit{
generalRequestForm:FormGroup;
invalidLogin:boolean=false;
无效项:布尔值=假;
submitSuccess:boolean=false;
invalidComments:boolean=false;
请求;
建造师(
私有formBuilder:formBuilder,
专用路由器:路由器,
私人apiService:apiService
) {
this.generalRequestForm=新表单组({
项目:新FormControl(“”,需要验证器),
注释:新FormControl(“”,需要验证程序),
请求:新FormControl(“”,需要验证器),
})
of(this.getRequestType())。订阅(请求=>{
this.requests=请求;
this.generalRequestForm.controls.requests.patchValue(this.requests[0].id);
});
}
onSubmit(){
console.log(“项…”,this.generalRequestForm)
如果(!this.generalRequestForm.controls.item.value){
this.invalidItem=true;
返回;
}
如果(!this.generalRequestForm.controls.comments.value){
this.invalidComments=true;
返回;
}
否则{
警报(“您的响应已被记录。管理员会在时间之前到达您的。”)
返回;
}
if(this.generalRequestForm.invalid){
返回;
}
常量loginPayload={
项:this.generalRequestForm.controls.item.value,
注释:this.generalRequestForm.controls.comments.value
};
this.apiService.login(loginPayload).subscribe(数据=>{
如果(data.status==200){
window.localStorage.setItem('token',data.token);
this.router.navigate(['home']);
}否则{
this.invalidLogin=true;
警报(数据、消息);
}
});
}
恩戈尼尼特(){
//window.localStorage.removietem('token');
//this.generalRequestForm=this.formBuilder.group({
//项目:['',Validators.compose([Validators.required]),
//注释:['',验证器。必需],
//请求:['',验证器。必需]
// });
}
getRequestType(){
返回[
{id:'1',name:'Parking Slot'},
{id:'2',name:'餐卡'},
{id:'3',name:'Infopark贴纸'},
{id:'4',name:'Address-Proof'},
{id:'5',name:'Form 16'},
{id:'6',name:'Time Entry'},
{id:'7',name:'Other Request'}
];
}
}
您可能需要在typescript文件(.ts)中定义表单对象,然后将其绑定到html表单。这被称为“反应形式”,您可以从angular查看有关此主题的文档:
(它还包含一个示例,以进一步了解情况)请显示一些代码您正在查找角度元素。请参阅。@Riscie我已在问题中添加了代码。谢谢。表单对象已经存在于我的代码片段中。表单在同一应用程序中运行时已正确绑定。但问题是当我将该组件构建为自定义web组件并从另一个项目中使用时。