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  • UpdatePanel and JQuery Plugin CQ

    Supported by Nova Outsourcing

     

    UpdatePanel is the powerful utility in Microsoft Asp.net family for asynchronous posback. JQuery is the popular framework to facilitate coding in the client end. When the two work together, issues occur.

    We normally code with JQuery plugin similar to the code below.

    <script type="text/javascript">
        $(document).ready(function () {
            //jMP3 init
            $(".mp3player").jmp3({
                showfilename: "false",
                backcolor: "000000",
                forecolor: "00ff00",
                 30,
                showdownload: "true"
                });
            });
        };
    </script>
    

    But if the code is in as UpdatePanel, as the following structure, the issue will happen.

    image

    You will find the JQuery Plugin only works when the page is first loaded. The JQuery Plugin disappears immediately when any asynchronous postback occurs.

    It is because that $(document).ready(…) only work when the whole document of the page is loaded. When the content is partially loaded by the asynchronous postback, it doesn’t work. So the JQuery Plugin is not applied to the elements.

    To address the issue, we would ask ScriptManager for help. The ScriptManager has the following events in client end.

    PageRequestManager.beginRequest before the asynchronous postback happen
    PageRequestManager.pageLoading after the beginRequest but before the content in the UpdatePanel is updated
    PageRequestManager.pageLoaded after the document in the page is loaded and after the content in the UpdatePanel is updated

    So we replace the $(document).ready(…) with the following code.

    <script type="text/javascript">
        Sys.Application.add_init(app_init);
        function app_init() {
            var prm = Sys.WebForms.PageRequestManager.getInstance();
            prm.add_pageLoaded(function () {
                $(".mp3player").jmp3({
                    showfilename: "false",
                    backcolor: "000000",
                    forecolor: "00ff00",
                     30,
                    showdownload: "true"
                });
            });
        };
    </script>
    

    Then the UpdatePanel and JQuery Plugin work together.

    Supported by Nova Outsourcing

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  • 原文地址:https://www.cnblogs.com/czy/p/2696021.html
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