JSFiddle - React, Tailwind, and code Playground

HTML

App Store crawler
<br>
<br>GET:
<br>
<br>
<form id="get_form" name="get_form" method="GET" action="" onSubmit="this.action=get_action();">App_store:
    <select name "app_store">
        <option value="play">Google Play</option>
        <option value="itunes">Apple iTunes</option>
    </select>
    <br>Package_name:
    <input type="text" name="package_name">
    <br>
    <br>
    <input type="submit" value="Submit">
</form>
<br>
<br>
<br>POST:
<br>
<br>
<form id="post" action="http://localhost:8080/update" method="POST">Enter JSON:
    <br>
    <textarea rows="20" cols="50" name="json_data"></textarea>
    <br>
    <input type="submit" value="Submit">

JavaScript

function get_action() {
        var url = "localhost:8080/crawl/play/fi/";
        url.concat("", document.get_form.package_name.value);
        var xhr = new XMLHttpRequest();
        xhr.open("GET", url, true);

    }