JSFiddle - React, Tailwind, and code Playground

HTML

<input type="number" id="value" />
<button onclick="check()">test</button>
<p id="pValue">
</p>

JavaScript

var myVar;


check = function(){
    myVar = document.getElementById("value").value;

    myVar = (myVar == parseInt(myVar) ? myVar : false); //to check if variable is an integer and not float
    if ( myVar >= 25 && myVar <= 28){
        document.getElementById("pValue").innerHTML = "true";
    }else{
        document.getElementById("pValue").innerHTML = "false";
    }
}