Скачать или смотреть How to Fix mainWindow Not Receiving Data in Electron JS

Learn how to resolve the issue of `mainWindow` not receiving data in your Electron JS application, ensuring smooth data integration between the main and renderer processes.
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This video is based on the question https://stackoverflow.com/q/63743655/ asked by the user 'Sairaj K' ( https://stackoverflow.com/u/11842349/ ) and on the answer https://stackoverflow.com/a/63745334/ provided by the user 'tpikachu' ( https://stackoverflow.com/u/10909844/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the mainWindow Not Receiving Data Issue in Electron JS

Creating a responsive and interactive Electron application can sometimes come with its set of challenges, particularly when it comes to sending data between the main process and the renderer process. One common issue developers encounter is the mainWindow not receiving data as expected. In this guide, we will break down how to address this problem effectively, using a simple example from a todo application.

The Problem

You may have built an Electron application where the intention is to send a list of todos from the main process to the renderer process once the window has fully loaded. However, despite logging the todos successfully in the console, they do not appear in the DOM. This can be confusing, and understanding why this happens is key.

Here’s the scenario: You have the following pieces of code where you're trying to send data from your main.js file to your index.html file but it seems the data transfer is failing.

Solution Breakdown

Understanding dom-ready Event

In your implementation, you’re using the dom-ready event to send data. It’s important to recognize that:

dom-ready is an event that doesn't exist on the BrowserWindow object but is actually an event on the webContents object.

Here’s the crucial part of the code you provided:

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

Correcting the Code

To ensure that the mainWindow sends the todos only when the DOM is fully loaded, you should use mainWindow.webContents.once('dom-ready', ...) instead. Here’s the corrected code:

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

Detailed Steps

Modify your main.js file:

Change the listener from mainWindow.once to mainWindow.webContents.once to correctly establish the event listener when the DOM is ready.

Update the Renderer Code:

Ensure that you are correctly listening for the received todos in your index.html. You already have this setup mostly right:

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

Conclusion

With this correction in place, your Electron application should now successfully transfer the todos from the main process to the renderer process once the DOM is fully loaded. Make sure that you test this thoroughly, and check your console logs to confirm that the data transfer is happening as expected.

By following these guidelines, you can avoid common pitfalls in Electron and ensure a seamless flow of data between your processes. Happy coding!