[英]Cannot set property 'elements' of undefined - Array in Angular
我的代碼出現以下錯誤。
“無法設置未定義的屬性‘元素’”
代碼如下所示:
this.languages.forEach((value, index) => {
debugger
this.languageTableElement = { type: 'checkbox'}
this.languageTableRows[index].elements.push(this.languageTableElement)
})
問題是:如何定義elements
?
好的,我重新了解了如何做到這一點,答案很簡單:
this.languageTableRows = [];
this.languages = await this.languageService.getAllLanguages().toPromise();
this.languages.forEach((value, index) => {
this.languageTableRows[index] = new TableRowModel;
this.languageTableRows[index].elements = [];
this.languageTableElement = { type: 'checkbox'}
this.languageTableRows[index].elements.push(this.languageTableElement)
})
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