How Can I Display Real-time Streaming Data from a Flask Endpoint in a Web Page?

Display Streaming Data from Flask in Real Time

In Flask, it's possible to stream data to a web page using a dedicated endpoint. While this allows real-time data transmission, figuring out how to incorporate this data into a dynamic HTML page can be challenging. This brief guide explores solutions for visually displaying streamed data on a web page.

Limitations of Template Injection

Unlike static data, streamed data cannot be directly injected into an HTML template on the server side. This is because templates are rendered once on the server and sent as a complete document to the client. Therefore, any updates to the streamed data won't reflect in the page.

JavaScript Streaming

One approach is to stream the data via JavaScript using XMLHttpRequest. In this scenario, the browser fetches data from the streaming endpoint periodically, interprets the message format, and updates the DOM accordingly. This allows for real-time updates of specific sections of the page.

Here's an example HTML fragment utilizing JavaScript to handle streamed data:

<p>Latest Output: <span></span></p>

iFrames and Stream Rendering

Another option is to utilize an iframe. By pointing the iframe to the streaming endpoint, you create a separate document that receives the streamed content. While this is effective, styling the iframe and incorporating it into the main page may present challenges.

In the iframe approach, the main page HTML would include the following:

<p>All Output: <iframe src="streaming_endpoint"></iframe></p>

Ultimately, the best solution for displaying streaming data depends on the specific requirements of your application. JavaScript streaming provides real-time updates and flexibility, while iframes are suitable for rendering HTML content without the risk of modifying the main page layout. Consider both approaches and choose the one that best meets your project's needs.

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