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[Angular] Angular 17 series (eighteen) ForkJoin waits for multiple HTTP parallel requests

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Posted on 6/10/2024 2:38:10 PM | | | |
Requirements: Angular interface data may need to come from multiple interfaces, and multiple interfaces can send HTTP requests together if they allow parallel requestsWait for the interface that takes the longest time to complete the request before displaying the interface。 Use ForkJoin to wait for all requests to complete.

ForkJoin in Angular is an operator used to execute multiple observables in parallel. It passes multiple Observables in as arguments and issues an array when all Observables are complete that contains the latest value emitted by each Observable.

The advantage of ForkJoin is that it can process multiple Observables simultaneously and return results when they are all complete. This is useful for situations where multiple data sources need to be fetched simultaneously, improving the performance and responsiveness of the application.

ForkJoin's application scenarios include, but are not limited to:

  • Request multiple APIs in parallel: When you need to obtain data from multiple APIs, you can use ForkJoin to initiate multiple requests at the same time and process the returned data after all requests are completed.
  • Merging of multiple data sources: When you need to fetch data from multiple data sources and merge them into a single result, you can use ForkJoin to handle the operation of fetching data in parallel.
  • Parallel execution of multiple tasks: When multiple tasks need to be executed simultaneously and move on to the next step after they are all completed, ForkJoin can be used to manage the parallel execution of tasks.


First, use ASP.NET Core to create two new test interfaces, the code is as follows:


Before using ForkJoin, the code was as follows:

The renderings are as follows:



After using ForkJoin, the code is as follows:

The renderings are as follows:



(End)





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