pass value to image control

This is my first time to use asp.net. I just want to get an image name passed from url (by using request.querystring), and then display this image, when user click the image, I also display the mouse coordinate. But I just can not get it to work, please help. Thanks. The following is my code:

<script runat="server">
Sub getCoordinates(sender As Object, e As ImageClickEventArgs)
 mess.Text="Coordinates: " & e.x & ", " & e.y
End Sub
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 Dim imagename as String = Request.QueryString("name")
 Dim imagePath as String =Server.MapPath("/keller/portrait/" & imagename)
End Sub
</script>
<html>
<body>
<form runat="server">
<p>Click on the image:</p>
<asp:Image
runat="server"
ImageUrl="<%=iamgePath%>"
OnClick="getCoordinates"/>
<p><asp:label id="mess" runat="server"/></p>
</form>
</body>
</html>

Welcome to the ASP.NET Forums, lily1.

The following update to your code will correctly show the image passed in with the QueryString.

<%@. page language="VB" debug="true" %>
<html>
<head>
<title>This is main Page</title>
<script runat="server"
Sub getCoordinates(sender As Object, e As ImageClickEventArgs)
 mess.Text="Coordinates: " & e.x & ", " & e.y
End Sub
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 Dim imagename as String = Request.QueryString("name")
 Dim imagePath As String = Server.MapPath("/keller/portrait/" & imagename & ".gif")
 MyImage.ImageUrl = imagePath
End Sub
</script>
<html>
<body>
 <form runat="server">
 <p>Click on the image:</p>
 <asp:Image runat="server"
 id="MyImage"
 OnClick="getCoordinates" />
 <p><asp:label id="mess" runat="server" /></p>
 </form>
</body>
</html>

The only difference is that I gave the asp:Image control an ID, and used this ID in your Page_Load code to set its ImageUrl property.

For details of how to get your imagemap working, see the following tutorial:
ImageMap.NET

I hope this helps.
Thanks for your help. I tried your script, The picture can be displayed correctly now, but when i click the picture, I got javascript error, it seems that function 'getCoordinates' does not execute at server instead it tries to run at client side. Here is url of the page:http://user1046822.wx15.registeredsite.com/keller/imagecrop_coodinates.aspx?name=test.jpg . Could you please tell me what is the problem? Thanks again.
> Could you please tell me what is the problem?

You've defined the problem yourself ... that getCoordinates tries to run at the client-side, not at the server.

Please go through the article I provided above. That will explain how to send click coordinates back to your server-side code.

pass values

On my web page i'm passing in a value using request.querystring, but i need
this same value several other pages. How can I store this value and use it o
n my other pages to execute my SQL?
thxIn a session variable.
Eliyahu
"IGotYourDotNet" <IGotYourDotNet@.discussions.microsoft.com> wrote in message
news:C3EEF090-CC7C-4A13-83EF-C0D7A655B93E@.microsoft.com...
> On my web page i'm passing in a value using request.querystring, but i
need this same value several other pages. How can I store this value and use
it on my other pages to execute my SQL?
> thx
You say you're "passing in a value" - Where are you passing it from? Where
are you passing it to?
HTH,
Kevin Spencer
.Net Developer
Microsoft MVP
Big things are made up
of lots of little things.
"IGotYourDotNet" <IGotYourDotNet@.discussions.microsoft.com> wrote in message
news:C3EEF090-CC7C-4A13-83EF-C0D7A655B93E@.microsoft.com...
> On my web page i'm passing in a value using request.querystring, but i
need this same value several other pages. How can I store this value and use
it on my other pages to execute my SQL?
> thx
You can pass values between pages using a variety of methods - session
variables are common, as is using viewstate. I prefer to structure my code
really well and use properties via the refernce page directive. Theres a
small example below for you
Regards
John Timney
Microsoft Regional Director
Microsoft MVP
"IGotYourDotNet" <IGotYourDotNet@.discussions.microsoft.com> wrote in message
news:C3EEF090-CC7C-4A13-83EF-C0D7A655B93E@.microsoft.com...
> On my web page i'm passing in a value using request.querystring, but i
need this same value several other pages. How can I store this value and use
it on my other pages to execute my SQL?
> thx
PassingValuesPage.aspx
<%@. Page Language="VB" ClassName="FirstPageClass" %>
<html>
<head>
<script runat="server">
Public ReadOnly Property FirstName() As String
Get
' first is the name of a TextBox control.
Return first.Text
End Get
End Property
Public ReadOnly Property LastName() As String
Get
' last is the name of a TextBox control.
Return last.Text
End Get
End Property
Sub ButtonClicked(sender As Object, e As EventArgs)
Server.Transfer("ReceivingValuesPage.aspx")
End Sub
</script>
</head>
<body>
<form runat="server">
First Name:
<asp:TextBox id="first"
runat="server"/>
<br>
Last Name:
<asp:TextBox id="last"
runat="server"/>
<br>
<asp:Button
OnClick="ButtonClicked"
Text="Go to second page"
runat=server />
</form>
</body>
</html>
--recievingvalues.aspx
<%@. Page Language="VB" %>
<%@. Reference Page="passingValuesPage.aspx" %>
<html>
<head>
<script runat="server">
Dim fp As FirstPageClass
Sub Page_Load()
If Not IsPostBack Then
fp = CType(Context.Handler, FirstPageClass)
End If
End Sub
</script>
</head>
<body>
<form runat="server">
Hello <%=fp.FirstName%> <%=fp.LastName%>
</form>
</body>
</html>

passing a GUID in the querystring

I need to pass a GUID into a page via the QueryString. If I do:

Dim myGUID as GUID
GUID = Request.QueryString("myGUID")

It won't run, and says that a value type of string cannot be converted to a GUID. I can't retype myGUID as a string, because I use it in a SQL Server Database call...It yells at me if try to do a query with it in there.

Am I doing something wrong? or is there just no way to pass a GUID through the querystring?

ThanksIf you pass the value on the url it will be in a string format. The following worked for me. Maybe this will help.

select * from table1 where uniqueID = cast('{5BEEAA61-394B-44F6-9AC8-A6EA5FC99490}' as uniqueidentifier)
You need to do the following:

Dim MyGuid As Guid = New Guid(Request.QueryString("myGuid"))

passing a variable to new page

Hello
I am new to asp.net, please help.
I have link and this works fine

Add/Edit

In classic asp I would use

<% Request.form("tbName ") %>

or

<% Request("tbName") %>

Sometimes I would assign this value to a variable and use it anywhere on the page.
How do I do this or is there a better way to do it in .net.
TIA MichaelIn the adim_sCodeEdit.aspx file, you just do the same:

(In the code behind file)

Dim tbName as string = request.params("tbName")

...
And do the test, make sure you capture the right result:

 response.write(tbName)

Thanks for the quick reply le9569
My companies isp does not support code behind.
This is how I have it now and it works. I was not sure where to put the

 response.write(tbName)

to make it work, everyplace I tried gave me errors.
Thanks again

<%@. Page Language="vb" Debug="true" %>
<script runat="server">
 Sub Page_Load(Source as Object, E as EventArgs)
 Dim tbName as string = request.params("tbName")
 lbltbName.text = tbName
 End Sub
</script>
<html>
<head>
</head>
<body>
 <form runat="server">
 <asp:Label id="lbltbName" runat="server"></asp:Label>
 </form>
</body>
</html>