Handling Image Input

Handling Image Input

• As you saw earlier, it is very easy to use the NAME value of an HTML SUBMIT button to determine which action to perform in a script. Thus, we typically see code as follows:

  if (delete button ne "")
    {
    do something
    }
  

• In other words, if the user has clicked the delete button (and the delete button has been assigned the VALUE), we will perform a deletion. If however, some other button is pressed, the VALUE of the delete button will be null and the action will not be performed.

• However, what if the user clicked an INPUT TYPE = "image" button?

• In this case, we will use similar logic...

  if ($form_data{'delete_image.y'} > 0)
    {
    do something
    }
  

• As you can see, the script checks to see if the y coordinate has been assigned a value (meaning the user clicked on it) and if so, performs an action.

Additional Resources:

• Perl
• Perl Resources
• Instant Web Scripts With CGI

Non-Parsed Header Scripts
Table of Contents
Debugging CGI Scripts