Wrox Programmer Forums
VB.NET 2002/2003 Basics For coders who are new to Visual Basic, working in .NET versions 2002 or 2003 (1.0 and 1.1).
Welcome to the p2p.wrox.com Forums.

You are currently viewing the VB.NET 2002/2003 Basics section of the Wrox Programmer to Programmer discussions. This is a community of software programmers and website developers including Wrox book authors and readers. New member registration was closed in 2019. New posts were shut off and the site was archived into this static format as of October 1, 2020. If you require technical support for a Wrox book please contact http://hub.wiley.com
Old June 30th, 2004, 11:00 AM
Authorized User
Join Date: Aug 2003
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Default Image Map?

Is there a way I can make a large image map type object, with a grid overlay? I don't want to redirect to a lot of webpages, I just want to submit the grid location they click to one webpage, and call a function from there with the data (grid location) from the previous page. Any suggestions?

Old June 30th, 2004, 11:37 AM
planoie's Avatar
Friend of Wrox
Join Date: Aug 2003
Posts: 5,407
Thanks: 0
Thanked 16 Times in 16 Posts

The key is that you have to get the values from the x and y "sub" elements of the posted form values. When you have an image input field (let's call it "MyMap"), what gets submitted is actually two form fields: MyMap.x and MyMap.y. To be safe in .NET, you should construct the field names using the ClientID property of the InputImage control. Take a look at this example:


Here's the important code:

strXField = String.Format("{0}.x", ImageButton1.ClientID)
strYField = String.Format("{0}.y", ImageButton1.ClientID)
strX = Request.Form.Item(strXField)
strY = Request.Form.Item(strYField)

This will retrieve the coordinates of the mouse on the image. If you have an image that is some kind of grid, then you can just do some math based on the image size and returned coords to determine the grid location.
Old July 1st, 2004, 10:59 AM
Authorized User
Join Date: Aug 2003
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts

Thanks a lot, I'll try that out.

Similar Threads
Thread Thread Starter Forum Replies Last Post
Heat Map over Google Map ajit Javascript 0 March 7th, 2008 09:01 AM
Map image or make graphic button dvukovic VB How-To 2 May 19th, 2007 11:45 PM
Curious image map issue... can you help? BananaJim Javascript 2 November 29th, 2006 03:10 PM
Use Map/image maps teresagoh Javascript 4 February 11th, 2006 03:54 AM
Image Map Coords interrupt Javascript How-To 1 March 8th, 2005 09:59 AM

Powered by vBulletin®
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright (c) 2020 John Wiley & Sons, Inc.