codice:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Esempio</title>
<script type="text/javascript">
function onsubmitForm () {
var aHideEl = document.getElementsByClassName("test_box");
for (var nLen = aHideEl.length, nIdx = 0; nIdx < nLen; nIdx++) {
aHideEl[nIdx].style.setProperty("display", "none");
}
document.getElementById("loading").style.removeProperty("display");
}
onload = function () {
document.getElementById("loading").style.setProperty("display", "none");
};
</script>
</head>
<body>
<div class="test_box"><form method="post" onsubmit="onsubmitForm();">
<input type="submit" id="submit" name="submit" value="Invia">
</form></div>
<div id="loading">Div da nascondere al caricamento</div>
</body>
</html>