UI flicker when array is changed angular 11

Question

I am contacting an array on value updated by the server, but the UI template flicker on concat.. what should be done to avoid such a situation.

   @Input('companies')   set setCompanyArray(companies) {
     this.showNotFound = false;> 
     if (!companies) {
       return;
     }
     companies.map((company) => {
       company['searchFilter'] = this.lastSearchedText;
    });
    if (!this.companies) {
       this.companies = companies;
       return;
     }
     this.companies = this.companies.concat(companies);

munleashed · Accepted Answer · 2022-06-03 13:03:50Z

1

Each time you assign a new value to companies variable, you will see flickering because Angular is rendering the whole list again. You should add trackByFn to tell Angular whether to rerender the whole list or just new items.

 <li *ngFor="let company of companies;trackBy: trackByFn"></li>

  trackByFn(index, company: Company) {

    return company.id // or whatever is an unique identificator for a company
  }

answered Jun 3, 2022 at 13:03

munleashed

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1 Comment

SS_1528 Over a year ago

But I am not using this companies array in ngFor , I am using this to pass as data in angular-ng-autocomplete. can u suggest another way?

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