本文介绍了发送同步请求角度 6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
我想在 angular 6 中发送同步请求这个嵌套的 for 循环.所有的 for 循环都必须等待对方的响应.请在 https://stackblitz.com
i want to send synchrouns request this nested for loop in angular 6. it all for loop must wait each other response. Please give some example in https://stackblitz.com
protected plateInfo(debug = true) {
for (let i = 0; i < 8; i++) {
for (let k = 0; k < 8; k++) {
if (k % 2 !== 0) {
for (let threshBlock = 21; threshBlock < 31; threshBlock++) {
if (threshBlock % 2 !== 0) {
for (let treshWeight = 5; treshWeight < 19; treshWeight++) {
if (treshWeight % 2 !== 0) {
this.getPLateInfo.getInfoPlate({
qausLast: i,
qausParam: k,
treshBlock: threshBlock,
treshWeight: treshWeight
}).subscribe(_data => {
this.result.push(_data)
_data.input1 = i
_data.input2 = k
})
}
}
}
}
}
}
}
}
推荐答案
你需要的是一个
concatMap 不会订阅下一个 observable，直到上一个完成，
from([your source array])
.pipe(
concatMap(
(item in your array) => {
return this.getPLateInfo.getInfoPlate(....
}
)
)
.subscribe(
(received data from your api call) => {
process received data here...
}
);
从以下位置导入它们:
import { from } from 'rxjs';
import { concatMap } from 'rxjs/operators';
有关 concatMap 的更多信息此处.
More info on concatMap here.
这是一个有效的stackblitz
你原来的plateInfo"函数会进行1000多次api调用，希望你知道你在做什么.
Your original "plateInfo" function will make more than 1000 api calls, I hope you know what you are doing.
无论如何，我不得不限制数组中的项目数量以保持 stackblitz 站点的响应.
Anyway, I had to limit the number of items in the array to keep stackblitz site responsive.
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