<!DOCTYPE html> <html lang="cs"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Test</title> <style type="text/css"> #output { border:2px solid black; padding:5px; } </style> </head> <body> <div id="output"> test </div> <input type="text" id="vstup"></input> <button onclick="akce()">Akce</button> <script> function akce(){ alert("neco se stalo") //document.getElementById('vstup') } </script> </body> </html>