In IE, when bind two "change" events to a textbox, and the first event will change the value of the textbox (e.g. toUpper, formatDate), then the second event will be fired twice.

Test code:

<input name="str1" id="str1" value="str1">
<script>
function toUpper() {
    document.getElementById("str1").value =
        document.getElementById("str1").value.toUpperCase();
}
function changeTest() {
    alert(1);
}
jQuery("#str1").bind("change", toUpper);
jQuery("#str1").bind("change", changeTest);
</script>

Test result:

• In IE(both IE6 and IE8), when input "abc" into str1, "1" will be alerted twice.

• In Firefox, it is OK, only alert once.