Question

我无法绑定其他组件的属性。我的代码有问题吗？

任何人都可以解释一下@Input（）装饰器的规则是什么？

这是我的例子

documentlist.component.ts

import { Component, OnInit, Input } from '@angular/core';
import { EntryService} from '../../entry.service'

import { Entry } from '../../entry.model';

@Component({
  selector: 'app-documentlist',
  templateUrl: './documentlist.component.html',
  styleUrls: ['./documentlist.component.css']
})
export class DocumentlistComponent implements OnInit {
    @Input() entry: Entry;
    dmsfile: Entry[];

    constructor(private entryService: EntryService) { 

    }

    ngOnInit() {
        this.entryService.getData().then(dmsfile => this.dmsfile = dmsfile);
    }
}

documentlist.component.html

<!-- start documnet list -->
<div class="documentlist">
  <div class="documentlist-container">
    <div class="panel panel-default">
      <!-- Default panel contents -->
      <div class="panel-heading clearfix">
        <span class="pull-left">Document list</span>
        <span class="btn btn-primary storage-new pull-right">
        New
        </span>
      </div>               
      <table class="table responsive table-striped">
       <thead>
          <tr>
            <th>Action</th>
            <th>DataID</th>
            <th>Storage ID</th>
            <th>Owner</th>
            <th>DocumentType</th>
            <th>Ref No.</th>
            <th>Status</th>
            <th>Created by</th>
            <th>CreatedDate</th>
            <th>Modified by</th>
            <th>ModifiedDate</th>
          </tr> 
        </thead> 
        <tbody> 
          <tr *ngFor="let documentlist of dmsfile" [entry]="documentlist">
            <td>
              <p>
                <span class="glyphicon glyphicon-trash"></span>
                <span class="glyphicon glyphicon-eye-open"></span> 
              </p> 
            </td> 
            <td *ngFor="let dataids of documentlist.dataid"><p>{{ dataids.id }}</p></td>
            <td *ngFor="let storageids of documentlist.storageid"><p>{{ storageids.id }}</p></td>
            <td *ngFor="let ownerids of documentlist.storageid"><p>{{ ownerids.ownerid }}</p></td>
            <td><p>{{ documentlist.documenttype }}</p></td>
            <td><p>{{ documentlist.documentreferenceno }}</p></td>
            <td><p>{{ documentlist.documentstate }}</p></td>
            <td><p>{{ documentlist.createdby }}</p></td>
            <td><p>{{ documentlist.createddate }}</p></td>
            <td><p>{{ documentlist.modifiedby }}</p></td>
            <td><p>{{ documentlist.modifieddate }}</p></td>
          </tr>
        </tbody> 
      </table>
    </div>
  </div>
</div>
<!-- end document list -->

entry.model.ts

export class Entry {
    dataid: [
        {
            dataid: [
                { 
                    id: number,
                    title: string,
                    comment: string,
                    releasedate: string,
                    releaseversion: string,
                    resourcetcode: string,
                    resourcetname: string,
                    createdby: string,
                    createddate: string
                }
            ],
            storageid: [
                {
                    id: number,
                    ownerid: number,
                    room: string,
                    cabinet: string,
                    bin: string,
                    description: string,
                    storagetype: string,
                    islock: boolean,
                    createdby: string,
                    createddate: string
                }
            ],
            documenttype: string,
            documentreferenceno: string,
            description: string,
            documentstate: string,
            profile: string,
            createdby: string,
            createddate: string,
            modifiedby: string,
            modifieddate: string
        }
    ]       
}

Answer 1

一般来说，有几种方法可以将数据从一个组件传递到另一个组件。您应该遵循的方法主要取决于组件之间的关系。

<强> @input（）

当组件之间存在父子关系时，例如：假设有两个组件TEMPSTLMNTMIDCOLECTION1和parent-component

现在在child-component的模板代码中，您的代码可能如下所示 -

parent-component

请注意， <div> <child-component [inputData]="inputData"> </child-component> </div>已传递到inputData。您可能已经猜到了 - 应该从child-component设置右侧inputData，parent-component表示它是one way data-binding。

[inputData]的组件类看起来像这样 -

parent-component

由于我们将export class ParentComponent { //more code here public inputData = "Input Value From Parent Component"; }作为inputData传递，因此我们必须在@Input()中掌握它：

child-component的组件类可能如下所示 -

child-component

现在，您可以在模板代码中显示import {Input, SimpleChanges, OnChanges} from '@angular/core'; //more import statements here export class ChildComponent{ @Input() inputData: any; public myInputData: any; ngOnChanges(changes : SimpleChanges){ if('inputData' in changes){ this.myInputData = changes['inputData'].currentValue; } } }，它将始终显示从myInputData

传递的更新值

根据组件之间的关系，还有其他方法可以将数据从一个组件传递到另一个组件，如 EventEmitter 和共享服务。

希望这有帮助。

角2 |我不能从另一个班级绑定财产

1 个答案: