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我创建了一个 Angular 6 项目,我在其中获取一个嵌套的公司对象,该对象包含多个地址以显示在视图中。我想每个子视图只显示其中两个,并使用分页来显示其余部分。我使用 ngx-pagination 和响应式表单。

但不幸的是,分页不能正常工作。它只显示前两个地址(如果“pageSize”= 2),当我单击分页控件时没有任何变化。只有“currentPage”(p - 在我的情况下)的值会发生变化。

如果我检查我的公司对象,它会填充该公司的所有现有地址,但我不会让它们消失。

我究竟做错了什么?

如果我更改“itmesPerPage”退出地址的数量,我可以显示所有这些地址 - 就是这样。

为了测试我使用了“拼接管”,但效果是一样的。我只能显示第一个地址,而永远不会——例如——最后一个。

如果我在视图中“检查”我的元素并单击控件,则可以识别页面更改但没有任何更改。

这是我的“公司详细信息组件”,用于创建抽象控件并从服务器加载数据:

ngOnInit() {

 this.companyDetailForm = this.formBuilder.group({
      id: [null],
      companyName: [''],
      middleName: [''],
      lastName: [''],
      created: [null],
      status: [''],
      isDeleted: [null],
      contactAddresses: this.formBuilder.array([
        this.addContactAddressFormGroup()
      ])
});
//Load the data
this.route.data.subscribe(data => {
  this.company = data['company']; // 'company' = name (..resolve: {company: ...) from route path in routes.ts
  this.companyDetailForm.patchValue({
   id: this.company.id,
   companyName: this.company.companyName,
   middleName: this.company.middleName,
   lastName: this.company.lastName,
   created: this.company.created,
   status: this.company.status,
   isDeleted: this.company.isDeleted,
   contactAddresses: this.company.contactAddresses
  });

  this.companyDetailForm.setControl('contactAddresses',
                                        this.setExistingContactAddresses(this.company.contactAddresses) );

  });

}

// initialize Form
addContactAddressFormGroup(): FormGroup {
return this.formBuilder.group({
  contactId: [null],
  addressId: [null],
  line1: ['Test'],
  line2: ['Test2'],
  line3: ['Test3'],
  city: [''],
  region: [''],
  postalCode: [''],
  country: [''],
  created: [''],
  status: [''],
  isDeleted: [null],
  addressType: [''],
});

}

setExistingContactAddresses(conAddSets: ContactAddress[]): FormArray {
const conAddFormArray = new FormArray([]);
conAddSets.forEach(cas => {
  conAddFormArray.push(this.formBuilder.group({
    line1: cas.line1,
    line2: cas.line2,
    line3: cas.line3,
    postalCode: cas.postalCode,
    city: cas.city,
    region: cas.region,
    country: cas.country
  }));
});
console.log(this.companyDetailForm);
return conAddFormArray;

}

视图的相关部分,魔法应该发生的地方:

…………

<div class col-sm-8>
        <div class="tab-panel">
            <tabset class="company-tabset">
                <tab heading="Addresses">
                  <div class="card-deck" style="width: auto">
                  <div formArrayName="contactAddresses"  *ngFor="let contactAddress of companyDetailForm['controls']['contactAddresses']['controls'] | paginate: { itemsPerPage: pageSize, currentPage: p } ; let i = index" >
                    <div [formGroupName]="i">
                      <div class="card">
                        <div class="card-header">

                        </div>
                        <div class="card-body" >
                          <div class="card-text">
                              <div class="form-group" aria-autocomplete="none">
                                  <strong><label for="line1">Street</label></strong>
                                  <input class="form-control" type="text" id="line1" formControlName="line1">
                                  <input class="form-control" type="text" id="line2" formControlName="line2">
                                  <input class="form-control" type="text" id="line3" formControlName="line3">
                              </div>
                              <div class="form-group" aria-autocomplete="none">
                                  <strong><label for="postalCode">Zip - City - Region</label></strong>
                                  <input class="form-control" type="text" id="postalCode" formControlName="postalCode">
                                  <input class="form-control" type="text" id="city" formControlName="city">
                                  <input class="form-control" type="text" id="region" formControlName="region">
                              </div>
                              <div class="form-group" aria-autocomplete="none">
                                  <strong><label for="country">Country</label></strong>
                                  <input class="form-control" type="text" id="country" formControlName="country">
                              </div>

                          </div>
                        </div>
                      </div>


                    </div>                                           

                  </div>                  

                  </div>

                  <div class="text-center mt-4">
                    <pagination-controls (pageChange)="p = $event" autoHide="true"></pagination-controls>
                    {{p}}
                  </div>                                           


                </tab>

我是角度的新手,任何帮助将不胜感激。

非常感谢提前汤姆

4

2 回答 2

1

In your html template, when you paginate contactAddresses, you get indexes i as [0,1],[0,1] and so on. But the angular form indexes are still going [0,1,2,3,4...n]. That's probably the problem.

Create a function, that dynamically generates index for instance generateIndex(i), that returns i + pageSize * pageIndex.

于 2019-07-29T12:46:48.117 回答
1

我遇到过同样的问题。表单控件未更新,因为等于i的formGroupName在不同页面上始终相同。对于第 1 页,索引是 1 和 2,对于第 2 页,又是 1 和 2。这是因为我们在 formArray 的分页部分循环。为了解决这个问题,我创建了一个从 pageSize、currentPage 和项目索引创建索引的函数。

接下来是思路:

  fieldGlobalIndex(index) {
    return this.pageSize * (this.currentPage - 1) + index;
  }

然后只需替换:

 [formGroupName]="i" -> [formGroupName]="fieldGlobalIndex(i)"

希望这会有所帮助。

于 2019-12-19T16:52:26.207 回答