Positioning AJAX ModalPopupExtender in the center of the screen problem

Question 1

Positioning AJAX ModalPopupExtender in the center of the screen problem

asp.net css ajax ajaxcontroltoolkit modalpopupextender

dani · Aug 28, 2009 · Viewed 48.2k times · Source

Answer

Answer

Modal popup panel is given an absolute position. So it needs to be inside an element which has a non-static position. In this case, I want it to be centred on the page, so I have put it inside an element (in this case an UpdatePanel but it doesn't matter what kind of element it is) which has an inline style of position:fixed;left:0;top:0.

<asp:UpdatePanel ID="updProductPopup" runat="server" style="position:fixed;left:0;top:0;">
<contenttemplate>

    <act:ModalPopupExtender ID="mpeProduct" runat="server" BackgroundCssClass="modalPopupBackground" BehaviorID="behaviourModalPopup" OkControlID="btnMpClose" PopupControlID="pnlModalPopup" PopupDragHandleControlID="pnlMpHandle" TargetControlID="btnMpHidden">
    </act:ModalPopupExtender>

    <!-- pnlModalPopup MUST have inline style display:none -->
    <asp:Panel ID="pnlModalPopup" runat="server" CssClass="modalPopup" style="display:none;">
        <asp:Panel runat="server" ID="pnlMpHandle" CssClass="modalPopupDragHandle">
            Panel Header
        </asp:Panel>
        <asp:Panel runat="server" ID="pnlMpContent">Here's my content</asp:Panel>
        <p class="modalPopupClose">
            <a id="btnMpClose" href="#" class="custom-button">Close</a>
        </p>
    </asp:Panel>
    <asp:Button ID="btnMpHidden" runat="server" Text="Button" CssClass="modalPopupHiddenButton" />

</contenttemplate>

I know the original question is quite old, but I spent a lot of time looking for the answer to this problem without finding it, and this question is comes up quite highly on Google, so hopefully this will save someone else some time.

Question 2

I have problem with positioning ModalPopupExtender in the center of the screen when it's PopupDragHandleControlID property is set (without this property it works fine ).

ModalPopupExtender is not positioned in the center of the screen. I thinks what causes the problem is the page's CSS layout cause when i disable it, popup positioned in the center of the screen (I don't understand why page's css affects ModalPopupExtender only when it's PopupDragHandleControlID property is set )

Thepage:

<!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 runat="server">
    <title>Untitled Page</title>
    <link href="layout.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <div id="header">
    </div>

     <div id="container">
       <div id="center" class="column">                    

          <div id="centercolcontent" class="centercolcontent">    
            <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>


        <asp:UpdatePanel ID="UpdatePanel1" runat="server" >
            <ContentTemplate>
                <asp:Button ID="btnShowPopup" runat="server" Text="Open" />   
                <asp:Panel ID="pnlUploader" runat="server" CssClass="pnlUploader"   style="display: none;">
                    <cc1:ModalPopupExtender ID="mdlPopup1" runat="server" TargetControlID="btnShowPopup"
                                PopupControlID="pnlUploader" CancelControlID="btnCancel"
                                BackgroundCssClass="modalBackground"
                                PopupDragHandleControlID="pnlUploader" RepositionMode="RepositionOnWindowResize"   />
                    <div id="pnlDragMe" class="pnlDragMe">
                        Image Uploader
                     </div>     

                     <div class="upload" id="upload">             
                         <div id="status" class="info">
                           Please select a file to upload
                         </div>
                        <div class="commands">      
                         <asp:Button ID="btnUpload" runat="server"  Text="Upload" 
                             OnClientClick="javascript:onUploadClick()" />
                         <asp:Button ID="btnCancel" runat="server" Text="Cancel" />
                      </div>        
                   </div>                                      
                </asp:Panel>    

            </ContentTemplate>   
         </asp:UpdatePanel>
          </div>

       </div>

      </div>               
      <div id="left" class="column">
      </div>

      <div id="right" class="column">                        
      </div>          

    <div id="footer">

    </div>




    </div>
    </form>
</body>

</html>

The CSS:

body
{
    min-width: 630px; 
}

#container
{
    padding-left: 200px; 
    padding-right: 150px; 
}

#container .column
{
    position: relative;
    float: left;
}

#center
{
    padding: 0px 0px; 
    width: 100%;
}

#left
{
    width: 200px; 
    padding: 0 0px 0 0; 
    right: 200px;
    margin-left: -100%;
}

#right
{
    width: 130px;
    padding: 0 10px; 
    margin-right: -100%;
}

#footer
{
    clear: both;
}


* html #left
{
    left: 150px; /* RC fullwidth */
}

/*** Equal-height Columns ***/

#container
{
    overflow: hidden;
}

#container .column
{
    padding-bottom: 1001em; /* X + padding-bottom */
    margin-bottom: -1000em; /* X */
}



* html body
{
    overflow: hidden;
}

* html #footer-wrapper
{
    float: left;
    position: relative;
    width: 100%;
    padding-bottom: 10010px;
    margin-bottom: -10000px;
    background: #FFF; /*** Same as body background ***/
}



body
{
    margin: 0;
    padding: 0;
}

#header, #footer
{
    font-size: large;
    text-align: center;
    padding: 0.3em 0;
}

#left
{
    /*background: #66F;*/
}

#center
{
    background: #DDD;
}



.modalBackground
{
    background-color: Gray;
    filter: alpha(opacity=70);
    opacity: 0.7;
}

Positioning AJAX ModalPopupExtender in the center of the screen problem

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