JSFiddle - React, Tailwind, and code Playground

HTML

<form action="message.html" method="get" onsubmit="return is_checked()">
	<p>Please select some categories that you are interested in?</p>
	<input id="sports" type="checkbox" name="interests" value="sports">sports</input><br/>
	<input id="electronics" type="checkbox" name="interests" value="electronics">electronics</input><br/>
	<input id="tools" type="checkbox" name="interests" value="tools">tolls</input><br/>
	<input type="submit" value="submit"></input>
 </form>

JavaScript

function is_checked (){
				var sports =document.getElementById("sports").checked;
				var electronics =document.getElementById("electronics").checked;
				var tools =document.getElementById("tools").checked;
			if(sports==false && electronics==false tools==false){
				alert("Please check a category");
				return false;
			}else{
				return true;
			
			}
			
			}