Angular 8 "TypeError: Cannot read property 'length' of undefined"

Question

当我想 return Angular 中数组的长度时遇到问题，控制台中出现消息 "TypeError: Cannot read property 'length' of undefined"。

  count: number = this.organismesFinanceurs.length;
  organismesFinanceurs: OrganismeFinanceur[];
  config: any = {
    itemsPerPage: 7,
    currentPage: 1,
    totalItems: this.count,
  };

ngOnInit() {
   this.serviceHttp2.getAllOrganismes().subscribe(resp => (this.organismesFinanceurs = resp));
}

Array OrganismeFinanceur[]如下：

[
{
  "code": "ASS. NAT.",
  "libelleCourt": "FSS ASSEMBLEE NATIONALE",
  "libelleLong": "FONDS DE SECURITE SOCIALE DE L ASSEMBLEE NATIONALE ET DU PERSONNEL"
},
{
  "code": "AUTRE REG.",
  "libelleCourt": "AUTRE REGIME SPECIAL",
  "libelleLong": "AUTRE REGIME SPECIAL"
},
{
  "code": "BANQ.DE FR",
  "libelleCourt": "BANQUE DE FRANCE",
  "libelleLong": "BANQUE DE FRANCE"
},]

Answer 1

试试 organismesFinanceurs: OrganismeFinanceur[] = [];

Angular 8 "TypeError: Cannot read property 'length' of undefined"

Angular 8 "TypeError: Cannot read property 'length' of undefined"

tabs

angular