How to prevent asp.net ajax postback with JQuery?

Question

<script type="text/javascript" language="javascript">
    function pageLoad(sender, args) {
        $('#bvft').addClass("bvft");

        $('#new').live('click', function() {
            $('#bvft').removeClass("bvft");
            $('#bvft').show("slow");
        });

        $('.ddlFrTime').change(function() {
            var vFTime = $('.ddlFrTime').val();

            if (vFTime != "") {
                $('#bvft').removeClass("bvft");
                $('#bvft').show("slow");
            }
            else { alert("sorry"); }
        }); 
    }        
</script>

In $('#bvft'), I have one dropdownlist

<asp:DropDownList ID="ddlFrTime" runat="server" Width="250px" CssClass="ddlFrTime" AutoPostBack="true"
                                    OnSelectedIndexChanged="ddlFrTime_SelectedIndexChanged">
                                </asp:DropDownList>

$(#bvft) is div id. $('#new') is button id. When page load, I want to disable. It works perfect. When I click the button, $(#bvft) div will show. But the problem is (in div, I have dropdownlist) when I select dropdownlist, the postback will work. At this time div is automatically hide back. How to prevent for this. Actually I used function pageLoad() to prevent postback. But it's not working.

Answer 1

将下拉框的autopostback设置为false

Answer 2

Now I got an answer... I put some code after function pageLoad()... like this

function pageLoad(sender, args) {
        if (!args.get_isPartialLoad()) {
            $('#bvft').slideUp('slow');
        }
        else {
            $('#bvft').slideDown('slow');
        }
    }

It will work pretty... no problem for postback...