Unable to make a sequential service (HTTP) calls in Angular 5 by using Joins












-1














I had a Array with N number of objects. I want to make a service call sequentially. One response comes based on that i will make a another request. Please provide a better approach to handle this scenario through JOINS in Angular 5.










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    -1














    I had a Array with N number of objects. I want to make a service call sequentially. One response comes based on that i will make a another request. Please provide a better approach to handle this scenario through JOINS in Angular 5.










    share|improve this question

























      -1












      -1








      -1







      I had a Array with N number of objects. I want to make a service call sequentially. One response comes based on that i will make a another request. Please provide a better approach to handle this scenario through JOINS in Angular 5.










      share|improve this question













      I had a Array with N number of objects. I want to make a service call sequentially. One response comes based on that i will make a another request. Please provide a better approach to handle this scenario through JOINS in Angular 5.







      angular5






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      asked Nov 13 at 4:59









      siva.kumar

      94




      94
























          1 Answer
          1






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          oldest

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          0














          You can use switchMap for this.



          nestedCalls(user: any) {
          return this.http.get('YOUR_URL').pipe(
          switchMap(data => {

          const body = {
          // do your work woth data - first service object
          };

          return this.http.post('YOUR_URL', body);
          })
          )
          }


          Or you can do something like below also :



                 this.service.getData(id, (response) => {
          this.service.getInitiatedEntity(response.id).subscribe(
          (retData) => {
          // response - 1st service data
          // retData - 2nd service data
          }
          );
          });


          Hope this help.






          share|improve this answer





















          • nestedCalls(user: any) { return this.http.get('YOUR_URL').pipe( switchMap(data => { const body = { // do your work woth data - first service object }; return this.http.post('YOUR_URL', body); }) ) } This is for two service which you written. let suppose i had n number of objects in my array. i want to make a service call one after another sequentially. Once one response then only i will make another api call. Could please let me know i have any ideas regarding this.
            – siva.kumar
            Nov 14 at 6:13













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          1 Answer
          1






          active

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          active

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          0














          You can use switchMap for this.



          nestedCalls(user: any) {
          return this.http.get('YOUR_URL').pipe(
          switchMap(data => {

          const body = {
          // do your work woth data - first service object
          };

          return this.http.post('YOUR_URL', body);
          })
          )
          }


          Or you can do something like below also :



                 this.service.getData(id, (response) => {
          this.service.getInitiatedEntity(response.id).subscribe(
          (retData) => {
          // response - 1st service data
          // retData - 2nd service data
          }
          );
          });


          Hope this help.






          share|improve this answer





















          • nestedCalls(user: any) { return this.http.get('YOUR_URL').pipe( switchMap(data => { const body = { // do your work woth data - first service object }; return this.http.post('YOUR_URL', body); }) ) } This is for two service which you written. let suppose i had n number of objects in my array. i want to make a service call one after another sequentially. Once one response then only i will make another api call. Could please let me know i have any ideas regarding this.
            – siva.kumar
            Nov 14 at 6:13


















          0














          You can use switchMap for this.



          nestedCalls(user: any) {
          return this.http.get('YOUR_URL').pipe(
          switchMap(data => {

          const body = {
          // do your work woth data - first service object
          };

          return this.http.post('YOUR_URL', body);
          })
          )
          }


          Or you can do something like below also :



                 this.service.getData(id, (response) => {
          this.service.getInitiatedEntity(response.id).subscribe(
          (retData) => {
          // response - 1st service data
          // retData - 2nd service data
          }
          );
          });


          Hope this help.






          share|improve this answer





















          • nestedCalls(user: any) { return this.http.get('YOUR_URL').pipe( switchMap(data => { const body = { // do your work woth data - first service object }; return this.http.post('YOUR_URL', body); }) ) } This is for two service which you written. let suppose i had n number of objects in my array. i want to make a service call one after another sequentially. Once one response then only i will make another api call. Could please let me know i have any ideas regarding this.
            – siva.kumar
            Nov 14 at 6:13
















          0












          0








          0






          You can use switchMap for this.



          nestedCalls(user: any) {
          return this.http.get('YOUR_URL').pipe(
          switchMap(data => {

          const body = {
          // do your work woth data - first service object
          };

          return this.http.post('YOUR_URL', body);
          })
          )
          }


          Or you can do something like below also :



                 this.service.getData(id, (response) => {
          this.service.getInitiatedEntity(response.id).subscribe(
          (retData) => {
          // response - 1st service data
          // retData - 2nd service data
          }
          );
          });


          Hope this help.






          share|improve this answer












          You can use switchMap for this.



          nestedCalls(user: any) {
          return this.http.get('YOUR_URL').pipe(
          switchMap(data => {

          const body = {
          // do your work woth data - first service object
          };

          return this.http.post('YOUR_URL', body);
          })
          )
          }


          Or you can do something like below also :



                 this.service.getData(id, (response) => {
          this.service.getInitiatedEntity(response.id).subscribe(
          (retData) => {
          // response - 1st service data
          // retData - 2nd service data
          }
          );
          });


          Hope this help.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 13 at 5:37









          Vishw Patel

          36119




          36119












          • nestedCalls(user: any) { return this.http.get('YOUR_URL').pipe( switchMap(data => { const body = { // do your work woth data - first service object }; return this.http.post('YOUR_URL', body); }) ) } This is for two service which you written. let suppose i had n number of objects in my array. i want to make a service call one after another sequentially. Once one response then only i will make another api call. Could please let me know i have any ideas regarding this.
            – siva.kumar
            Nov 14 at 6:13




















          • nestedCalls(user: any) { return this.http.get('YOUR_URL').pipe( switchMap(data => { const body = { // do your work woth data - first service object }; return this.http.post('YOUR_URL', body); }) ) } This is for two service which you written. let suppose i had n number of objects in my array. i want to make a service call one after another sequentially. Once one response then only i will make another api call. Could please let me know i have any ideas regarding this.
            – siva.kumar
            Nov 14 at 6:13


















          nestedCalls(user: any) { return this.http.get('YOUR_URL').pipe( switchMap(data => { const body = { // do your work woth data - first service object }; return this.http.post('YOUR_URL', body); }) ) } This is for two service which you written. let suppose i had n number of objects in my array. i want to make a service call one after another sequentially. Once one response then only i will make another api call. Could please let me know i have any ideas regarding this.
          – siva.kumar
          Nov 14 at 6:13






          nestedCalls(user: any) { return this.http.get('YOUR_URL').pipe( switchMap(data => { const body = { // do your work woth data - first service object }; return this.http.post('YOUR_URL', body); }) ) } This is for two service which you written. let suppose i had n number of objects in my array. i want to make a service call one after another sequentially. Once one response then only i will make another api call. Could please let me know i have any ideas regarding this.
          – siva.kumar
          Nov 14 at 6:13




















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