[英]Cannot set property 'elements' of undefined - Array in Angular
I got the following error with my code.我的代码出现以下错误。
"Cannot set property 'elements' of undefined"
“无法设置未定义的属性‘元素’”
Code looks like this:代码如下所示:
this.languages.forEach((value, index) => {
debugger
this.languageTableElement = { type: 'checkbox'}
this.languageTableRows[index].elements.push(this.languageTableElement)
})
The question is: How to define the elements
?问题是:如何定义
elements
?
Ok, i reconized how to do it, the answer is simple:好的,我重新了解了如何做到这一点,答案很简单:
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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