返回多个对象 Angular 2 表单

Question

我是角度 2 的新手。上传两个或多个文档时，它会列在模板中。列出的文档的每一行都有用于输入其他信息的输入槽。提交时，仅在文档列表的最后一行中输入的值将作为对象返回。我希望返回在文档列表中输入的所有行的值。下面是我的代码

模板

<h1 class="separator">Manage Documents</h1>
<!-- in transit -->
<div class="row">
<div class="col-xs-2">
<input type="file" id="uploadFile" style="display: none" (change)='onClickUploadDocument($event)' multiple>
<label for="uploadFile"  class="btn btn-primary">Upload Documents</label>
</div>
<div class="col-xs-6">
<input type="button" value="Select Truck To Send Document" class="btn btn-primary" data-toggle="modal" data-target="#selectTruck">
</div>
</div>

<table cellpadding="4" class="grid" >
<thead><tr><th>Document Name</th><th>Document ID</th><th>Document Type</th><th>Source</th>
<th>Document Date</th><th>Trip ID</th><th>Notes</th><th>Action</th></tr></thead>
<form [ngFormModel]="myform" (ngSubmit)="onSubmit(myform.value)">
<tbody *ngFor="let file of files">
    <tr > 
    <td class="form-group" >{{file.name}}</td>
    <td class="form-group"><input type="text" class="form-control"  ngControl="documentId" #documentId="ngForm"></td>
    <td class="form-group"><input type="text" class="form-control" ngControl="type" #type="ngForm"></td>
    <td class="form-group"><input type="text" class="form-control" ngControl="source" #source="ngForm"></td>
    <td class="form-group"><input type="date" class="form-control" ngControl="date" #date="ngForm"></td>
    <td class="form-group"><input type="text" class="form-control" ngControl="tripId" #tripId="ngForm"></td>
    <td class="form-group"><input type="text" class="form-control" ngControl="notes" #notes="ngForm"></td>
        <td class="form-group">
            <a (click)="remove(file)"><span class="glyphicon glyphicon-remove" aria-hidden="true"></span></a> 
        </td>
    </tr>
</tbody>
</table>
<!-- save button -->
<button type="submit" class="form-group" class="btn  btn-primary " >Save</button>
</form>

元件

 import {Component, OnInit, OnChanges} from '@angular/core';
    import {NgClass, FORM_DIRECTIVES, Control, ControlGroup, FormBuilder } from '@angular/common';
    import {ROUTER_DIRECTIVES} from '@angular/router-deprecated';
    import {FleetService} from '../../fleet/fleetControlPanel/fleetControlPanelService';
    import {DocumentManagementService} from './documentManagementService';
    @Component({
        selector: 'documentManagement',
        templateUrl: 'app/dashboard/features/documents/documentManagement/documentManagementTemplate.html',
        directives: [ROUTER_DIRECTIVES, NgClass, FORM_DIRECTIVES ]
    })
    export class DocumentManagementComponent implements OnInit, OnChanges {
        myform: ControlGroup;
        file: any[];
        files: any[] = [];
        trucks: any[];
        errorMessage: any;
        checked: boolean ;
        // constructor to loop the products in product service file and disply in html
        constructor(private _fleetService: FleetService, private _documentManagementService: DocumentManagementService,
          _formBuilder:  FormBuilder){
            this.myform = _formBuilder.group({
                'documentId': [],
                'type': [],
                'source': [],
                'date': [],
                'tripId': [],
                'notes': []
            })
        }
        ngOnInit(): void {
        }
        ngOnChanges(): void {
        }
        onClickUploadDocument(event){
            console.log("clicked")
            let fileList: FileList = event.target.files;
        console.log("file: ",fileList);
        for (let i = 0; i < fileList.length; i++) {
            var files = fileList[i];
             console.log("files are: ",files);
             this.files.push(files);
        } 
        }
        remove(file: any){
             console.log("delete file:..", file)
              var index = this.files.indexOf(file);
            this.files.splice(index, 1)
            console.log("total files in list:..", this.files)
         }
        onSubmit (documents: any) {
             console.log("returned objects are:..", documents)
        }
    }

有人可以帮我如何返回为所有文档输入槽输入的值吗？谢谢。

Answer 1

每一行绑定到同一个控件实例。您需要改为将每个实例绑定到它们自己的实例。

<tbody *ngFor="let file of files let i=index">
    <tr > 
    <td>{{file.name}}</td>
    <td><input type="text" ngControl="documentId{{i}}" #documentId="ngForm"></td>
    <td><input type="text" ngControl="type{{i}}" #type="ngForm"></td>
    <td><input type="text" ngControl="source{{i}}" #source="ngForm"></td>
    <td><input type="date" ngControl="date{{i}}" #date="ngForm"></td>
    <td><input type="text" ngControl="tripId{{i}}" #tripId="ngForm"></td>
    <td><input type="text"ngControl="notes{{i}}" #notes="ngForm"></td>
        <td>
            <a (click)="remove(file)"><span class="glyphicon glyphicon-remove" aria-hidden="true"></span></a> 
        </td>
    </tr>
</tbody>

       this.myform = _formBuilder.group({
       })
       this.files.forEach((f, i) => {
            this.myForm.addControl('documentId' + i, new Control()),
            this.myForm.addControl('type' + i, new Control()),
            this.myForm.addControl('source' + i, new Control()),
            this.myForm.addControl('date' + i, new Control()),
            this.myForm.addControl('tripId' + i, new Control()),
            this.myForm.addControl('notes' + i, new Control()),
       })

更新this.files（添加或删除项目）时，还需要更新this.form。

您可以考虑将每一行包装在组件中，并将其用作控件以使代码更简单。组件需要实现ControlValueAccessor如在为自定义控件实现值访问器时未从事件中的模型获取更新值中所示