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<!DOCTYPE html> <html> <body> <p>Please input a number between 5 and 10:</p> <input id="demo" type="text"> <button type="button" onclick="myFunction()">Test Input</button> <p id="message"></p> <script> function myFunction() { var message, x; message = document.getElementById("message"); message.innerHTML = ""; x = document.getElementById("demo").value; try { if(x == "") throw "empty"; if(isNaN(x)) throw "not a number"; x = Number(x); if(x < 5) throw "too low"; if(x > 10) throw "too high"; } catch(err) { message.innerHTML = "Input is " + err; } } </script> </body> </html>