HtmlInputFile Control

Definition and Usage

The HtmlInputFile control is used to control an <input type="file"> element. In HTML, this element is used to upload a file to the server.

Properties

Property	Description
Accept	List of acceptable MIME types
id	A unique id for the control
MaxLength	The maximum number of characters allowed in this element
PostedFile	Gets access to the posted file
runat	Specifies that the control is a server control. Must be set to "server"
Size	The width of the element

Example 1

In the following example we declare one HtmlInputFile control, one HtmlInputButton control, and three HtmlGeneric controls in an .aspx file (remember to embed the controls inside an HtmlForm control). When the submit button is triggered, the submit subroutine is executed. The file name and file type are displayed on the page, while the file itself is uploaded to the c directory on the server:

<script runat="server">
  Sub submit(Sender as Object, e as EventArgs)
    fname.InnerHtml=MyFile.PostedFile.FileName
    clength.InnerHtml=MyFile.PostedFile.ContentLength
    MyFile.PostedFile.SaveAs("c:\uploadfile.txt")
  End Sub
</script>

<html>
<body>
<form action="ex_htmlinputfile.aspx" method="post"
enctype="multipart/form-data" runat="server">
<p>
Select file to upload to server:
<input id="MyFile" type="file" size="40" runat="server"> 
</p>
<p>
<input type="submit" value="Upload!" OnServerclick="submit"
runat="server">
</p>
<p>
<div id="FileDetails" runat="server">
  FileName: <span id="fname" runat="server"/><br />
  ContentLength: <span id="clength" runat="server"/> bytes
</div>
</p>
</form>
</body>
</html>

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