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VisualizaçõesManage Edits on FileUpload Control
I have a product page. I want to add my product to my database and I want also to update my product. I have a problem with images. When I insert the product everithing is ok.. In my aspx page I have this code:
<span>
<asp:FileUpload ID="files" runat="server" AllowMultiple="true" />
</span>
<div runat="server" id="previewImages"></div>
and when I save my product, in code behind I have this code:
string filenm = string.Empty;
HttpFileCollection fileCollection = Request.Files;
for (int i = 0; i < fileCollection.Count; i++)
{
HttpPostedFile uploadfile = fileCollection[i];
if (uploadfile.ContentLength > 0)
{
string filename = uploadfile.FileName;
System.IO.Directory.CreateDirectory(Server.MapPath("immScarpe/" + txtStyle.Text));
file.SaveAs(Server.MapPath("immScarpe/" + txtStyle.Text + "/") + fileName);
//this is pseudo-code
INSERT INTO PRODUCT_IMM (IdProduct, Path) VALUES (Id, "immScarpe/" + txtStyle.Text + "/" + fileName)
}
}
Now, the problem is that I can EDIT the saved product. When I click the edit button for a product, I have to load all it's data and let the user modify them. Also the images.
the main question is: How can I load the saved images in asp:FileUpload control?
Another thing I would like to do is to show images previews...in insert and in edit.
An Example of what I want to do is the thing that amazon does
but, if it's possible with only one FileUpload with AllowMultiple = true
I am willing to use other technologies like javascript, jquery and Ajax if it's necessary
3 Respostas
Responde à pergunta0
Show Images Preview - Insert
<script src="jquery-1.10.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
function ShowpImagePreview(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$('#previewImage').attr('src', e.target.result);
}
reader.readAsDataURL(input.files[0]);
}
}
</script>
<asp:Image ID="previewImage" runat="server" />
<asp:FileUpload ID="FileUpload1" runat="server" onchange="ShowpImagePreview(this);" />
0
Here is a very basic example as to how you can handle images after they have been send to the server. In this snippet the filename of the image is fixed, but it should be enough to give you push in the right direction.
protected void Page_Load(object sender, EventArgs e)
{
//check if the file exists and show
if (File.Exists(Server.MapPath("testImage.jpg")))
{
setImage("/testImage.jpg");
}
}
//upload a new image
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
try
{
FileUpload1.SaveAs(Server.MapPath("testImage.jpg"));
setImage("/testImage.jpg");
}
catch
{
//error writing file
}
}
}
//delete the image
protected void LinkButton1_Click(object sender, EventArgs e)
{
try
{
File.Delete(Server.MapPath("testImage.jpg"));
LinkButton1.Visible = false;
Image1.Visible = false;
}
catch
{
//error deleteing file
}
}
//set the image and show the delete link
private void setImage(string image)
{
Image1.ImageUrl = "/testImage.jpg";
Image1.Visible = true;
LinkButton1.Visible = true;
}
ASPX
<asp:Image ID="Image1" runat="server" Visible="false" />
<br />
<asp:LinkButton ID="LinkButton1" runat="server" Visible="false" OnClick="LinkButton1_Click">Delete image</asp:LinkButton>
<br />
<br />
<asp:FileUpload ID="FileUpload1" runat="server" />
<br />
<asp:Button ID="Button1" runat="server" Text="Upload" OnClick="Button1_Click" />
0
For displaying images to GridView from disk
Now you have the images shown, you want to have some replace or delete functionality on the images. You need to convert your field on the GridView for image to Template Field. You can do this by clicking on the source view of your ASPX page and replacing your ImageField or BoundField (whichever field you used in displaying the image).
See the design of the GridView on the question:
How to display image inside gridview template field without using handler class?
The way to bind the image source is in the answers in that question.
To have a delete or replace functionality, you can include a LinkButton control inside your TemplateField below the tag that displays the image.
You can set the LinkButton's CommandName property to 'Delete' or 'Replace' then on your .vb or .cs file, find the 'RowCommand' event for your GridView.
It goes something like (pseudo code only)
Protected Sub GridView_RowCommand(ByVal sender As Object, ByVal e As System.GridViewCommandEventArgs) Handles GridView.RowCommand
If e.CommandName = 'Delete' Then
'Place your delete query for your image record on the database here..
'Place your delete file from disk code here..
End If
End Sub
More info on GridView RowCommand Event