无法使用primeng 虚拟滚动延迟加载(Unable to use primeng <p>

我想实现一个大的数据集与primeng延迟加载<p-datatable> 。我所做的一切记录在官方网站上，但我不能使它工作。

该onLazyLoad回调在装载表的时间只运行一次。如预期它不会在每个滚动触发。

<div style="max-height:300px; border:1px solid black;overflow-y:auto">
      <p-dataTable #pocListref [value]="data" rowHover="true" [(selection)] = "selectedData" scrollable="true" scrollHeight="200px" [rows]="4"
      [style]="{'margin-top':'30px'}"  [paginator]="true" [rowsPerPageOptions]="[5,10,20]"
        [lazy]="true" [totalRecords]="totalRecords" (onLazyLoad)="lazyLoad($event)">
        <p-column header="Id">
        <ng-template pTemplate="body" let-index="rowIndex">
            {{index}}
        </ng-template>
        </p-column>
        <p-column  selectionMode="multiple" [style]="{'width':'5%'}"></p-column>
        <p-column field="name" header="Name"[sortable]="true"></p-column>
        <p-column field="age" header="Age" [sortable]="true"></p-column>
        <p-column field="company" header="Company" [sortable]="true"></p-column>
      </p-dataTable>
  </div>

同样的工作正常的分页程序执行。我注意到，它与分页程序只能如果我不使用virtualScroll属性，这是有道理的，但不知何故virtualScroll不作出滚动任何影响。

我知道已经有一个类似的问题，但它仍然回答。

有人曾经使用虚拟滚动成功地延迟加载。任何建议将是有益的。

Answer 1:

尝试像这样我的例子：

这是我没有分页程序和使用virtualScroll更新代码

<p-dataTable [value]="resultsArr" scrollable="true" scrollHeight="100px" [rows]="4" virtualScroll="virtualScroll" [style]="{'margin-top':'30px'}" [lazy]="true" [totalRecords]="results.length" (onLazyLoad)="lazyLoad($event)">
<p-column header="Id">
<ng-template pTemplate="body" let-index="rowIndex">
    {{index}}
</ng-template>
</p-column>
<p-column  selectionMode="multiple" [style]="{'width':'5%'}"></p-column>
<p-column field="name" header="Name"[sortable]="true"></p-column>
<p-column field="age" header="Age" [sortable]="true"></p-column>
<p-column field="company" header="Company" [sortable]="true"></p-column>
</p-dataTable>

component.ts

export class Component {
    private results: Array<any> = []; // have 15+ objects in this array
    private resultsArr: Array<any> = [];

constructor() {
    this.results = [{
        name: "david",
        age: 26,
        company: "XYz Company"
    }, {
        name: "david",
        age: 26,
        company: "XYz Company"
    }, {
        name: "david",
        age: 26,
        company: "XYz Company"
    }, {
        name: "david",
        age: 26,
        company: "XYz Company"
    }, {
        name: "david",
        age: 26,
        company: "XYz Company"
    }, {
        name: "david",
        age: 26,
        company: "XYz Company"
    }]
}

    lazyLoad(event: any) {
        setTimeout(() => {
            if (this.results) {
                this.resultsArr = this.results.slice(event.first, (event.first + event.rows));
            }
        }, 250);
    }
}

component.html

<p-dataTable [value]="resultsArr" [lazy]="true" [totalRecords]="results.length" [responsive]="true"
             [paginator]="true" (onLazyLoad)="lazyLoad($event)" [rows]="5" [filterDelay]="500"
             [rowsPerPageOptions]="[5,10,20]" sortField="first_name" [sortOrder]="1">
  <p-column field="id" header="#" [sortable]="true" styleClass="columnId" [filter]="true"></p-column>
  <p-column field="first_name" header="First Name" [sortable]="true"></p-column>
  <p-column field="last_name" header="Last Name" [sortable]="true"></p-column>
</p-dataTable>