Implementation of async also not working angular2+ - node.js

Question

I have made a function in my angular2+ component and the output comes first and the function runs later and hence the appropriate output which i want comes later. The function passes a variable parameter along with the http request to the back-end NodeJS. And returns the result. I want to find its length which i am able to retrieve. However, i want to call this parameter more than once by passing multiple parameters. So i defined it as Asynchronous function. The code is as -
app.component.ts
// Function 1
getNodesCount() {
console.log("INSIDE getNodesCount()")
if (this.selectedAPIName.length == 1) {
this.nodesObjQ1 = {
'relationObj': this.menuItem,
'nodeValue1': this.selectedAPIName[0]
}
this.callFunctionCount(this.nodesObjQ1).then((rs: any[])
=> {
this.nodesObjL1 = rs;
});
console.log("this.nodesObjL1 =", this.nodesObjL1)
}
}
//Function 2
async callFunctionCount(trueNodesObject) {
console.log("nodesObj =", trueNodesObject);
await new Promise(next => {
this.http.get("http://localhost:3003/seekExtraction/nodesObj/" +
JSON.stringify(trueNodesObject))
.map(Response => Response)
.catch((err) => {
console.log("err =", err)
return Observable.throw(err);
})
.subscribe((res: Response) => {
console.log("XXXXXXXXXXXX Response on /seekExtraction",
res);
this.nodesInfo = res;
this.nodesLength = this.nodesInfo.records.length
next()
})
});
console.log("return this.nodesLength =", this.nodesLength)
return this.nodesLength;
}
Major Outputs -
this.nodesObjL1 = undefined
return this.nodesLength = 2
Please help to retrieve this value -
this.nodesObjL1
after this value
this.nodesInfo.records.length= 2

Answer 1

actual minimal example would have helped ensure clean code... but give this a go...
getData = function (trueNodesObject) {
return new promise((resolve, reject) => {
this.http.get("http://localhost:3003/seekExtraction/nodesObj/" +
JSON.stringify(trueNodesObject))
.map(Response => Response)
.catch((err) => {
console.log("err =", err)
return Observable.throw(err);
reject(err);
})
.subscribe((res: Response) => {
console.log("XXXXXXXXXXXX Response on /seekExtraction",
res);
this.nodesInfo = res;
this.nodesLength = this.nodesInfo.records.length
resolve(this.nodesLength);
next()
});
})
}
async function callFunctionCount(trueNodesObject) {
console.log("nodesObj =", trueNodesObject);
const someVal = await getData(trueNodesObject);
console.log("return this.nodesLength =", someVal)
}