Get a value from an input in JavaScript and use it in Java

Question

I work on an application and I want to connect the front end (JavaScript) with the back end (Java). I have an input in HTML. When a user inputs something, by clicking on a button, I want to get that value in Java, so I can perform some actions on it. How can I do this? Thank you!

<input type="text" id="input" placeholder="Input...">
<button type="button" id="button" onclick="loadResults()">Search</button>

You have to serialize the content you want to send (usually JSON, but it could also be something else) and then send it to the backend by using XMLHttpRequest or any wrapper that your framework provides — Guerric P
– Guerric P, Commented Dec 14, 2020 at 18:33

Gustavo Freire · Accepted Answer · 2020-12-14 18:37:38Z

1

the easiest way I can see is getting the value from the input using the id property, like so:

const inputValue = document.getElementById("input").value

and then it is expected that you have some kind of API setup on your java backend, if so you can use the fetch built in function to make a HTTP request to you java backend https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API

answered Dec 14, 2020 at 18:37

Gustavo Freire

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