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Version Q2 2011 released 07/12/2011
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Upload / Accessibility




Accessibility validation

Validate with WAVE

WAVE is a free web accessibility evaluation tool, which checks for compliance issues with many of the Section 508 and WCAG guidelines. Have in mind that only humans can determine whether a web page is accessible - the above validation link is provided for the sake of completeness.


  • Keep in mind:

    • When using access key functionality the AccessKey property of RadUpload control should be set to a capital letter.
    • Notice that in Opera browser to focus file input you need to Tab twice. This apply only in case when using RadUpload control without checkboxes.

    AccessKey = "P"

    Note: The largest allowed combined file size for upload in this example is 100MB. This is specified by the maxRequestLength="102400" set in Web.config file. If you attempt to upload files with total size greater that 100MB you will get "Page Not Found" error. For more information about uploading large files visit the help article Uploading Large Files

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page Language="vb" CodeFile="DefaultVB.aspx.vb" AutoEventWireup="true" Inherits="Telerik.Web.Examples.Upload.IntegratedValidation.DefaultVB" %>

    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="qsf" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/tr/xhtml11/dtd/xhtml11.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head id="Head1" runat="server">
        <qsf:HeadTag runat="server" ID="Headtag1"></qsf:HeadTag>
    </head>
    <body class="BODY">
        <form runat="server" id="mainForm" method="post">
        <telerik:RadScriptManager ID="ScriptManager1" runat="server">
        </telerik:RadScriptManager>
        <qsf:Header runat="server" ID="Header1" NavigationLanguage="VB"></qsf:Header>
        <telerik:RadUpload runat="server" ID="RadUpload" OnClientAdded="keyboardSupport" AccessKey="P">
        </telerik:RadUpload>
        <br />
        <telerik:RadButton runat="server" ID="RadButton" Text="Submit">
        </telerik:RadButton>
        <br />
        <br />
        <div style="padding-top: 15px;">
            <h3>
                Accessibility validation</h3>
            <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">Validate with WAVE</asp:LinkButton>
            <p>
                WAVE is a free web accessibility evaluation tool, which checks for compliance issues
                with many of the Section 508 and WCAG guidelines. Have in mind that only humans
                can determine whether a web page is accessible - the above validation link is provided
                for the sake of completeness.</p>
        </div>
        <qsf:Footer runat="server" ID="Footer1"></qsf:Footer>
        </form>
        <script type="text/javascript">

            $ = $telerik.$;

            // keyboardSupport() method activates focusing with TAB key
            function keyboardSupport(sender, args) {
                var $fileInput = $(args._fileInputField);

                var $fakeInput = $fileInput.nextAll("input[class='ruFakeInput']");
                var $selectButton = $fileInput.nextAll("input[class='ruButton ruBrowse']");
                $fakeInput.attr("tabindex", "-1");
                $selectButton.attr("tabindex", "-1");

                $fileInput.focus(function (e) {
                    $selectButton.css("border", "1px dotted");
                });

                $fileInput.blur(function (e) {
                    $selectButton.css("border", "0px");
                });

                if (navigator.userAgent.indexOf("MSIE") != -1) {
                    $fileInput.keydown(function (e) {
                        if (e.keyCode == Sys.UI.Key.enter) {
                            e.preventDefault();
                            $fileInput.click();
                        }
                        if (e.keyCode == Sys.UI.Key.tab && e.shiftKey == false) {
                            $fakeInput.focus();
                        }
                        if (e.keyCode == Sys.UI.Key.tab && e.shiftKey == true) {
                            var $checkbox = $(".ruCheck", args.get_row());
                            if ($checkbox[0] != undefined) {
                                e.preventDefault();
                                $checkbox.focus();
                            }
                            else {
                                $fileInput.parent().focus();
                            }
                        }
                    });
                }

                if ($telerik.isOpera) {
                    var $checkbox = $(".ruCheck", args.get_row());
                    var $fileInputRow = $("input[type='file']", args.get_row());
                    var upload = $find("<%=RadUpload.ClientID %>");
                    var accesskey = upload._accessKey;

                    var $fileInputs = $("input[type='file']:first", $get("<%=RadUpload.ClientID%>"));

                    // attach accesskey to the first file input because it is not possible to determine with javascript when the accesskey is pressed
                    if ($fileInputs.length == 1) {
                        $fileInputs.attr("accesskey", accesskey);
                    }

                    // to focus file input into Opera need to Tab twice
                    // the following code simulates double Tabbing
                    if ($checkbox != undefined) {
                        $checkbox.keydown(function (e) {
                            if (e.keyCode == Sys.UI.Key.tab) {
                                e.preventDefault();
                                $fileInputRow.focus();
                            }
                        });

                    }
                }
            }

            // the following methods are listening for keyboard combination which is equal to accesskey combination and simulate it's behaviour - focus the element
            $(document).keydown(function (e) {
                var accesskey = $find("<%=RadUpload.ClientID%>")._accessKey;

                if ($telerik.isFirefox) {
                    if (e.altKey == true && e.shiftKey == true && e.which == accesskey.charCodeAt()) {
                        focusOnFirstInput();
                    }
                }

                if ($telerik.isChrome || $telerik.isSafari || $telerik.isIE) {
                    if (e.altKey == true && e.which == accesskey.charCodeAt()) {
                        focusOnFirstInput();
                    }
                }
            });

            function focusOnFirstInput() {
                var firstInput = $("input[type='file']", $get("<%=RadUpload.ClientID%>"))[0];
                if (firstInput != undefined) {
                    firstInput.focus();
                }
            }

        </script>
    </body>
    </html>

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