Kód v HTML :
<!DOCTYPE html> <html><head> <script type="text/javascript"> checked = false; function checkedAll () { if (checked == false) { checked = true; } else { checked = false; } for (var i = 0; i < document.getElementById('my').elements.length; i++) { document.getElementById('my').elements[i].checked = checked; } } </script> <title>Označiť / odznačiť všetky checkboxy</title> </head> <body> <form id='my' action='/nejakaAkcia' > <input type='checkbox' name='ch1' value='1'/>Vyber 1<br/> <input type='checkbox' name='ch2' value='2'/>Vyber 2<br/> <input type='checkbox' name='ch3' value='3'/>Vyber 3<br/> <input type='checkbox' name='ch3' value='4'/>Vyber 4<br/> <br/> <input type='button' name='CheckAll' value='Check All' onClick='checkedAll();'/> </form> </body> </html>