无法获取未定义或空引用的属性"0" [英] Unable to get property '0' of undefined or null reference

问题描述

我收到以下错误，该错误仅在IE/Edge中显示.

I am getting the following error which shows up in IE/Edge only.

Unable to get propety '0' of undefined or null reference

我通过以下方式使用RxJ的可观察对象:

I am using RxJs observables in the following manner:

getVersions(): void {
  this.databaseService.getProductVersions().subscribe(
    (versions) => this.processVersions(versions),
    (error) => console.error(error)
  );
}

，并且在Chrome/Firefox中可以正常运行. productVersions看起来像这样:

and in Chrome/Firefox this works without errors. productVersions looks like this:

getProductVersions(): Observable<any[]> {
    let options = this.header();
    let url: string = this.baseUrl + 'admin/version/searchall';
    return this.http.get(url, options).map(
        response => response.json(),
        error => console.log(error)
    );
}

我不正确地使用Observable吗?我应该取消订阅吗? (我的api调用是有限的，因此从我阅读的内容中取消订阅是没有必要的.)

Am I using the Observable incorrectly. Should I be unsubscribing? (My api call is finite so from what I've read unsubscribing is not necessary).

推荐答案

我认为我已经排除了我正在使用的第3方库.但是我发现它正在那里发生.因此，不是我的代码导致了此问题.感谢@Martin和@Jakub的帮助.多亏了您，我至少现在正确地使用了map/catch方法.

I thought I had ruled out the 3rd party library I was using. But I found that it was happening there. So it was not my code causing the issue. Thanks @Martin and @Jakub for your help. I am at least now using the map/catch methods correctly thanks to you.

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