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Listing 5.6 Adding the SlickUpload HTTP handler and HTTP module
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<httpHandlers> <add path="SlickUpload.axd" verb="GET,HEAD,POST,DEBUG" type="Krystalware.SlickUpload.SlickUploadHandler, Krystalware.SlickUpload" /> </httpHandlers> <httpModules> <add name="HttpUploadModule" type="Krystalware.SlickUpload.HttpUploadModule, Krystalware.SlickUpload"/> </httpModules>
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We may have more or fewer handlers and modules, but we need to add the custom IHttpHandler, which configures the HTTP handler, and IHttpModule, which configures the HTTP module, to the end of the list. Note that if you re running under IIS 7, these declarations will need to be moved under the system.webServer/handlers and system.webServer/modules sections of Web.config, respectively. With SlickUpload referenced and configured in our Web.config file, we can now create a controller and view to allow the user to upload files. We ll create a screen to upload files, with the Index action displaying a simple form. The controller in listing 5.7 merely returns a ViewResult.
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Listing 5.7 The UploadController s Index action
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public class UploadController : Controller { public ActionResult Index() { return View(); }
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SlickUpload uses a traditional web control to process file uploads. But because we can still use web controls in an MVC application, the SlickUpload control won t pose a problem for us. SlickUpload also supports additional configuration options that enable MVC scenarios, such as hosting in a nonserver control form tag. In listing 5.8, we see the Index that s used to build the upload form. The view includes a form tag and the SlickUpload control.
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Listing 5.8 The Index view using the SlickUpload web control
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<% using (Html.BeginForm( Builds form "UploadResult", element "Upload", FormMethod.Post, new { id = "uploadForm", enctype = "multipart/form-data" })) { %> <kw:SlickUpload ID="SlickUpload1" runat="server" UploadFormId="uploadForm" MaxFiles="1"
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Configures SlickUpload control
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The SlickUpload component
ShowDuringUploadElements="cancelButton" HideDuringUploadElements="uploadButton"> <DownlevelSelectorTemplate> <input type="file" /> Defines up- and </DownlevelSelectorTemplate> down-level <UplevelSelectorTemplate> templates <input type="button" value="Add File" /> </UplevelSelectorTemplate> <FileTemplate> <kw:FileListRemoveLink runat="server"> [x] remove</kw:FileListRemoveLink> <kw:FileListFileName runat="server" /> <kw:FileListValidationMessage runat="server" ForeColor="Red" /> </FileTemplate> <ProgressTemplate> <table width="99%"><tr><td> <p>Upload Progress:</p> <div class="progressBorder"> <kw:UploadProgressBarElement runat="server" CssClass="progressBar"/> <div class="progressValue"> <kw:UploadProgressElement runat="server" Element="PercentCompleteText"> (calculating) </kw:UploadProgressElement> </div> </div> </td></tr></table> </ProgressTemplate> </kw:SlickUpload> <hr /> <p> Defines submit <input type="submit" value="Upload" button id="uploadButton" /> </p> <% } %>
To build our file upload form in listing 5.8, we first need to build the outermost form HTML tags with the Html.BeginForm method B. The target will be the UploadResult action of the Upload controller, which will be the action redirected to after the upload is complete. To ensure our form works correctly with the browser and the SlickUpload control, we give the form a unique ID and set the encoding to "multipart/formdata". Next, we add the SlickUpload control C, matching the upload form ID to the form tag s ID and setting the maximum number of uploaded files to 1. The control allows adding multiple files, but we ll restrict the number of files for this example. The next two configuration properties match up to a cancel button (which we leave off) and the upload button. The values match up to HTML element identifiers because our input button for initiating the upload has an ID of "uploadButton" too E. With the control configured, we supply a set of templates for the file selector, file template, and progress template. To support older browsers, we configure both the downlevel and up-level D file templates. Older browsers are presented with the normal file
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The Upload Files screen showing the file selector template
input, whereas newer browsers are presented with a simple button. Figure 5.3 shows the site displaying the file selector template. Once the user chooses a file, the file template is shown for each file. In this example, we include the name of the file and a remove link. If we allowed multiple file uploads, the user could remove a file from the list before uploading the entire group of files. Because we only allow one file, the Add File button is hidden once a file is chosen, as shown in figure 5.4.
The Upload Files screen showing the file listing template
The SlickUpload component
Finally, we configure the upload progress template, which is shown to users after they click the Upload button. We display a progress bar using the supplied SlickUpload controls. If we wanted, though, we could show much more information, including the file count, current file being uploaded, upload speed, and time remaining. Our site, in figure 5.5, shows the progress bar and percentage complete.
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