RISOLTO qualcuno mi sa spiegare perchè se metto
window.onload=function(){
document.getElementById("somma").onclick = sommaNumeri(); funziona solo una volta
mentre
window.onload=function(){
document.getElementById("somma").onclick = sommaNumeri; funziona sempre?
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> 
<head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title>Calcolatrice</title> 
<script type="text/javascript" src="calcolatrice.js"></script>
 </head> 
<body> 
<input type="text" id="primoVal" value="0"/> 
<input type="text" id="secondoVal" value="0"/>
 <p id="ris"></p>
 <input type="button" id="somma" value="somma" onclick="sommaNumeri()"/> 
</body>
 </html>
codice:
var som=0; 
window.onload=function(){
 document.getElementById("somma").onclick = sommaNumeri;
 } 
function sommaNumeri(){
 var val1 = parseInt(document.getElementById("primoVal").value);
 var val2 = parseInt(document.getElementById("secondoVal").value);
 som=val1+val2; document.getElementById("ris").innerHTML=(som);
 }