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Learn to implement communication between a host website and an iframe in Angular 9 using RxJS. Discover how to wait for a message event effectively with our step-by-step guide.
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Mastering Angular 9 and RxJS: How to Wait for a Response After postMessage

In modern web development, communication between different components often requires seamless message passing. This can be especially crucial when dealing with iframes and postMessage in Angular applications. If you’re new to RxJS and looking to implement effective communication between a host website and an iframe, you're in the right place! In this post, we’ll explore how to wait for a response after sending a message using postMessage.

The Problem

One-way communication via postMessage can be limiting when you need to receive a response from the iframe after sending a message. The challenge lies in how to wait for that response effectively. As a developer, you might find yourself asking, “How can I implement a function that sends a message and waits for a response?” This query discusses how to achieve that using RxJS in Angular 9.

Understanding the Solution

To solve this problem, it is important to leverage RxJS observables, allowing you to handle events asynchronously. Let's break this down step-by-step:

Step 1: Install RxJS

Ensure you have RxJS installed in your Angular project. Usually, it comes by default with Angular, but always good to check! You can verify by looking into your package.json, or simply install it using:

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Step 2: Setting up the Send Function

You will need to implement a send(message) function to invoke postMessage, which sends the message to the iframe. Here’s a basic example:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Creating the sendAndWait Function

The next step is to create the sendAndWait function. We’ll use RxJS’s capabilities here to listen for the message event and handle it appropriately.

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Using Async-Await with Promises

To make it easier to handle asynchronous code, you can opt for returning a Promise, so it works well with async/await. Here’s how you can create an async version of sendAndWait:

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Step 5: Implementation Example

You can now call the sendAndWait function and capture the response as follows:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By utilizing the power of RxJS observables along with Angular's capabilities, you can effectively create a communication channel between a host website and an iframe that waits for a message event. This approach not only streamlines the process but also enhances the user experience by ensuring that responses are handled gracefully.

Now you have a clear path to implement your messaging system. With these expert tips, you can simplify your coding and robustly handle communication between iframes in Angular 9.

If you found this post helpful or have further questions, feel free to reach out or leave a comment below! Happy Coding!