"Creating a custom input tag in Rails that triggers an event when the value is changed

Is there a more efficient way to trigger events when the value of an input tag changes (i.e., whenever a character is entered or deleted) and display these values in the controller without relying on ajax?

Currently, my approach involves implementing a JavaScript snippet that uses addEventListener to monitor changes in the input element (see here) and then makes an ajax call to a Rails controller to update the value of the input tag. However, using ajax seems overly complicated compared to a more native solution in Rails, which I have been unable to locate.

javascriptruby-on-railsajaxdom-events

Answer №1

If you find yourself needing to communicate from the browser to the server (no matter the programming language) without reloading the page, utilizing Ajax is the recommended approach. Nowadays, another option is using fetch, which functions in a similar way.

If you require every key press to be transmitted to the server (specifically to the controller), you can implement a keyup event listener. Within this event listener function, you can initiate an Ajax/fetch request to the designated endpoint and retrieve relevant data from the controller.

It's crucial to include a timestamp in your requests and ensure that these timestamps are echoed back in the responses as well. In many cases like these, distinguishing between new and outdated data is important, especially if a user is typing rapidly. Due to network latency, responses may not always be received in the same order as the requests were sent.

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