javascript - 如何从 Angular 中的 foreach 循环返回数组数据

Question

我正在循环嵌套对象以获取一些数据。这是可行的，但我似乎无法返回数据并在其他地方使用它。

我尝试过将循环放入 promise 中，但也无济于事。我做错了什么？

data: any = {
    '1234': {
        url: 'https://example1.com/',
        path: 'uploads',
        link: 'https://example1.com/uploads',
    },
    '5678': {
        url: 'https://example2.com/',
        path: 'uploads',
        link: 'https://example2.com/uploads',
    }
}


onSubmit(formData) {

    this.formdata = formData;

    Object.keys(this.data).forEach(key => {
        if (key == this.formdata.pin) {
            const url = this.data[key].url;
            // have also tried this.url to no avail
        }
    });

    // says undefined
    console.log(url);

    // set up headers, etc...

    // I need to use here
    this.http.post(url, body, head)
    ...
}

Answer 1

onSubmit(formData) {

this.formdata = formData;
let url; // Define here so that its accessible
Object.keys(this.data).forEach(key => {
    if (key === this.formdata.pin) {
         url = this.data[key].url;
        // have also tried this.url to no avail
    }
});

// Now url is in scope
console.log(url);

    ...
}