Save as on change input file

Good morning,

I have a file named UploadIMG.aspx with some code html and UploadIMG.aspx.vb and this one empty.

The html and JS part it's something like this:

<div class="wrapper">
<h3>Click to add</h3>
</div>

$("h3").click(function () {
$(".wrapper").append("\
   <img id='uploadPreview1' width='200' height='100' /> \
   <input id='MyFile' class='inputImage' type='file' onchange='UploadImage();'/>");

});

http://ift.tt/1IgV1zC

I want to upload the image to my server whenever they change it on the input but without pressing any button.

I tried to save it with SaveAs but I don't know how to apply this to an onchange.

<script runat="server">
Sub UploadButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    If (MyFile.HasFile) Then
        Dim fileName As String = MyFile.FileName
        MyFile.PostedFile.SaveAs(Server.MapPath("~/img/") & MyFile.FileName)
    Else
    End If
End Sub

Can anyone help me? Thanks