PrimeNG表格过滤器:无法设置未定义的属性(设置’filters’)

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英文:

PrimeNG Table filter: Cannot set properties of undefined (setting 'filters')

问题

我需要保存 primeng 表格的过滤状态。我将状态保存到服务中,这方面没有问题。我也从服务中接收数据,并在控制台中显示它们,一切都正常。

但是当我尝试将当前的过滤状态更改为从服务中接收到的状态时,出现了错误。

ERROR TypeError: Cannot set properties of undefined (setting 'filters')

Component.ts

ngOnInit(): void {
  const savedFilters = this.fundingService.getDataState();
  console.log("savedFilters: ", savedFilters); // 一切正常
  if (savedFilters){
    this.dt.filters = savedFilters; // 出错
  }
}

seeDetailedData(id: string) {
  const filters: FilterMetadata[] | FilterMetadata = this.dt.filters;
  this.fundingService.setDataState(filters);
  this.router.navigate(['test', id]);
}

Component.html

<p-table #dt [value]="data" [paginator]="data.length > 10" [rows]="10" [globalFilterFields]="['name', 'surname']" (sortFunction)="sortPool($event)" [customSort]="true">
  <!-- ... -->
</p-table>

Service.ts

private state: any = {};

getDataState(): any {
  return this.state;
}

setDataState(newState: any) {
  this.state = newState;
}
英文:

I need to save the filtering state of the primeng table. I save the state to the service, there is no problem with that. I also receive data from the service, I display them in the console, everything is fine.
But when I try to change the current filtering state to the one I received from the service, I get an error.

ERROR TypeError: Cannot set properties of undefined (setting &#39;filters&#39;)

Component.ts

  ngOnInit(): void {
    const savedFilters = this.fundingService.getDataState();
    console.log(&quot;savedFilters: &quot;, savedFilters); // all is good
    if (savedFilters){
      this.dt.filters = savedFilters; //error
    }
  }

  seeDetailedData(id: string) {
    const filters: FilterMetadata[] | FilterMetadata = this.dt.filters;
    this.fundingService.setDataState(filters);
    this.router.navigate([&#39;test&#39;, id]);
  }

Component.html

&lt;p-table #dt [value]=&quot;data&quot; [paginator]=&quot;data.length &gt; 10&quot; [rows]=&quot;10&quot; [globalFilterFields]=&quot;[&#39;name&#39;, &#39;surname&#39;]&quot; (sortFunction)=&quot;sortPool($event)&quot; [customSort]=&quot;true&quot;&gt;
 &lt;!-- ... --&gt;
&lt;/p-table&gt;

Service.ts

  private state: any = {};

  getDataState(): any {
    return this.state;
  }

  setDataState(newState: any) {
    this.state = newState;
  }

答案1

得分: 1

过滤器状态的赋值应该在 ngAfterViewInit 中实现,而不是在 ngOnInit 中。

Component.ts

  ngAfterViewInit(): void {
    const savedFilters = this.fundingService.getDataState();
    console.log("savedFilters: ", savedFilters);
    if (savedFilters){
      this.dt.filters = savedFilters;
    }
  }

我认为这与 ViewChild 只有在指令在组件模板中初始化后才可访问有关,而 ngAfterViewInit 在初始化后立即调用。

英文:

Filter state assignment should be implemented in ngAfterViewInit instead of ngOnInit

Component.ts

  ngAfterViewInit(): void {
    const savedFilters = this.fundingService.getDataState();
    console.log(&quot;savedFilters: &quot;, savedFilters);
    if (savedFilters){
      this.dt.filters = savedFilters;
    }
  }

I think this is related to the fact that ViewChild becomes accessible only after the directive is initialized in the component template, and ngAfterViewInit is called right after its initialization.

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  • 本文由 发表于 2023年8月8日 22:44:25
  • 转载请务必保留本文链接:https://go.coder-hub.com/76860672.html
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