RXJS and Ionic- Sequencial Subscriptions Waiting on User Action





.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}







1












$begingroup$


In an Ionic App a user can open a new browser via "inAppBrowser". I'm trying to get the stats of the user before they go into to the inAppBrowser, get the stats again when browser closes, and then run a function to compare the before and after.



What I have right now is working but I feel like I'm not doing it the proper RXJS way and I want to make sure I do this right. Is this a case for using MergeMap or is that making it needlessly complicated? Do I need to worry about possible race conditions?



Code Snippet:



let previousStats = 

this.reloadStats(user)
.pipe(
first(), // getting only the first because I dont want this to update
tap(val => {
previousStats = val //setting the stats before the user leaves
})
)
.subscribe()

const browser = this.inAppBrowser.create(user.url) //user opens a browser

this.subscriptionUserUrl = browser.on('exit') // user closes the browser
.switchMap(() => this.reloadStats(user)) // get the most latest stats
.subscribe(currentStats =>{
this.handleBrowserExit(previousStats, currentStats) // do the comparison
})









share|improve this question







New contributor




gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$



















    1












    $begingroup$


    In an Ionic App a user can open a new browser via "inAppBrowser". I'm trying to get the stats of the user before they go into to the inAppBrowser, get the stats again when browser closes, and then run a function to compare the before and after.



    What I have right now is working but I feel like I'm not doing it the proper RXJS way and I want to make sure I do this right. Is this a case for using MergeMap or is that making it needlessly complicated? Do I need to worry about possible race conditions?



    Code Snippet:



    let previousStats = 

    this.reloadStats(user)
    .pipe(
    first(), // getting only the first because I dont want this to update
    tap(val => {
    previousStats = val //setting the stats before the user leaves
    })
    )
    .subscribe()

    const browser = this.inAppBrowser.create(user.url) //user opens a browser

    this.subscriptionUserUrl = browser.on('exit') // user closes the browser
    .switchMap(() => this.reloadStats(user)) // get the most latest stats
    .subscribe(currentStats =>{
    this.handleBrowserExit(previousStats, currentStats) // do the comparison
    })









    share|improve this question







    New contributor




    gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.







    $endgroup$















      1












      1








      1





      $begingroup$


      In an Ionic App a user can open a new browser via "inAppBrowser". I'm trying to get the stats of the user before they go into to the inAppBrowser, get the stats again when browser closes, and then run a function to compare the before and after.



      What I have right now is working but I feel like I'm not doing it the proper RXJS way and I want to make sure I do this right. Is this a case for using MergeMap or is that making it needlessly complicated? Do I need to worry about possible race conditions?



      Code Snippet:



      let previousStats = 

      this.reloadStats(user)
      .pipe(
      first(), // getting only the first because I dont want this to update
      tap(val => {
      previousStats = val //setting the stats before the user leaves
      })
      )
      .subscribe()

      const browser = this.inAppBrowser.create(user.url) //user opens a browser

      this.subscriptionUserUrl = browser.on('exit') // user closes the browser
      .switchMap(() => this.reloadStats(user)) // get the most latest stats
      .subscribe(currentStats =>{
      this.handleBrowserExit(previousStats, currentStats) // do the comparison
      })









      share|improve this question







      New contributor




      gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.







      $endgroup$




      In an Ionic App a user can open a new browser via "inAppBrowser". I'm trying to get the stats of the user before they go into to the inAppBrowser, get the stats again when browser closes, and then run a function to compare the before and after.



      What I have right now is working but I feel like I'm not doing it the proper RXJS way and I want to make sure I do this right. Is this a case for using MergeMap or is that making it needlessly complicated? Do I need to worry about possible race conditions?



      Code Snippet:



      let previousStats = 

      this.reloadStats(user)
      .pipe(
      first(), // getting only the first because I dont want this to update
      tap(val => {
      previousStats = val //setting the stats before the user leaves
      })
      )
      .subscribe()

      const browser = this.inAppBrowser.create(user.url) //user opens a browser

      this.subscriptionUserUrl = browser.on('exit') // user closes the browser
      .switchMap(() => this.reloadStats(user)) // get the most latest stats
      .subscribe(currentStats =>{
      this.handleBrowserExit(previousStats, currentStats) // do the comparison
      })






      typescript observer-pattern rxjs






      share|improve this question







      New contributor




      gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






      New contributor




      gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked 3 hours ago









      gv0000gv0000

      1061




      1061




      New contributor




      gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      gv0000 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















          0






          active

          oldest

          votes












          Your Answer





          StackExchange.ifUsing("editor", function () {
          return StackExchange.using("mathjaxEditing", function () {
          StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
          StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
          });
          });
          }, "mathjax-editing");

          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "196"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: false,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: null,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });






          gv0000 is a new contributor. Be nice, and check out our Code of Conduct.










          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fcodereview.stackexchange.com%2fquestions%2f217224%2frxjs-and-ionic-sequencial-subscriptions-waiting-on-user-action%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          gv0000 is a new contributor. Be nice, and check out our Code of Conduct.










          draft saved

          draft discarded


















          gv0000 is a new contributor. Be nice, and check out our Code of Conduct.













          gv0000 is a new contributor. Be nice, and check out our Code of Conduct.












          gv0000 is a new contributor. Be nice, and check out our Code of Conduct.
















          Thanks for contributing an answer to Code Review Stack Exchange!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          Use MathJax to format equations. MathJax reference.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fcodereview.stackexchange.com%2fquestions%2f217224%2frxjs-and-ionic-sequencial-subscriptions-waiting-on-user-action%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          Terni

          A new problem with tex4ht and tikz

          Sun Ra