在Angular 6中顺序执行http请求 [英] Execute http request sequentially in Angular 6
本文介绍了在Angular 6中顺序执行http请求的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要按顺序向服务器发送多个HTTP PUT请求(下一个请求仅在完成上一个请求后才启动,但请求的数目是固定的). 如果我使用下面的源代码,则将发送所有请求
I need to send multiple HTTP PUT request to server sequentially (after the next request is only started after completing the previous request, the number of request is not fixed). If I use the below source code, all request will be sent
`listURL.forEach(url => {
const req = new HttpRequest('PUT', url, formData, { reportProgress: true});
httpClient.request(req).subscribe(event=>{});
});`
反正有顺序执行请求吗?
Is there anyway to execute the requests sequentially?
推荐答案
如果您不熟悉rxjs,也许可以尝试以下方法?
If you are not familiar with rxjs, perhaps you can try the following?
let requests = listURL.map(url => new HttpRequest('PUT', url, formData, { reportProgress: true});
function do_seq(i) {
httpClient.request(requests[i]).subscribe(event => {
if (i < requests.length - 1) do_seq(i + 1);
});
}
do_seq(0);
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