Prevent duplicate submissions in JSP

STRUTS2 itself provides a duplicate-submit check mechanism, but I don't want to pop up an error page, but instead do nothing, just commit once

1. Set a variable, set a variable, only allowed to submit once.

<script type="text/javascript">
function checkSubmit() {
　if (checkSubmitFlg == true) {
　　return false;
　}
　checkSubmitFlg = true;
　return true;
}
</script>

<form onsubmit="return checkSubmit();" method="post">

Method 1 is effective on IE6 and Firefox.

2. How to disable a button

Because our server is too slow, let the button dimmed, give users a better experience

<script type="text/javascript">
function disableSubmit(form) {
　var elements = form.elements;
　for (var i = 0; i < elements.length; i++) {
　　if (elements[i].type == 'submit') {
　　　 elements[i].disabled = true;
　　}
　}
}
</script>

<form name="form1" onsubmit="setTimeout('disableSubmit(form1)',100) return checkSubmit();" method="post">

Disabling immediately causes the button's individual action setting to expire, so add a delay

Method 2 is effective in IE6. Firefox is not valid for unknown reason. But it's the second insurance anyway, it doesn't matter.