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PHP Tutorials - Supporting Hidden Form Fields

By: FYICenter.com

(Continued from previous topic...)

How To Support Hidden Form Fields?

Hidden fields are special fields in a form that are not shown on the Web page. But when the form is submitted, values specified in the hidden fields are also submitted to the Web server. A hidden field can be specified with the <INPUT TYPE=HIDDEN ...> tag. The PHP script below shows you a good example:

<?php
  print("<html><form action=processing_forms.php method=post>");
  print("<input type=hidden name=module value=FAQ>\n");
  print("<table><tr><td colspan=2>Please enter and submit your"
    ." comments about FYICenter.com:</td></tr>");
  print("<tr><td>Your Name:</td>"
    ."<td><input type=text name=name></td></tr>\n");
  print("<tr><td>Comments:</td>"
    ."<td><input type=text name=comment size=40>"
    ."</td></tr>\n");
  print("<tr><td colspan=2>"
    .'<input type=submit name=submit value="Submit">'
    ."<td></tr></table>\n");
  print("</form></html>\n");
?>

If you submit this form, you will get something like this:

Number of values: 4
  module = FAQ
  name = Peter
  comment = Thanks for the good tips.
  submit = Submit

(Continued on next topic...)

  1. How To Create a Web Form?
  2. What Are Form Input HTML Tags?
  3. How To Generate a Form?
  4. Where Is the Submitted Form Data Stored?
  5. How To Retrieve the Submitted Form Data?
  6. What Happens If an Expected Input Field Was Not Submitted?
  7. How To Avoid the Undefined Index Error?
  8. How To List All Values of Submitted Fields?
  9. What Are Input Values of SELECT Tags?
  10. How To Specify Input Values for Radio Buttons?
  11. How To Specify Input Values for Checkboxes?
  12. How To Retrieve Input Values for Checkboxes Properly?
  13. How To Supply Default Values for Text Fields?
  14. How To Remove Slashes on Submitted Input Values?
  15. How To Support Multiple Submit Buttons?
  16. How To Support Hidden Form Fields?
  17. How To Generate and Process a Form with the Same Script?
  18. How To Submit Values without Using a Form?
  19. How To Retrieve the Original Query String?
  20. How To Protect Special Characters in Query String?
  21. How To Support Multiple-Page Forms?

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