Simple forms

PHP Lab #4: Simple forms

In Notepad, create a new HTML file called phplab4.html. Insert the following HTML code, which creates a form.

<HTML>
<HEAD>
<TITLE>PHP lab 4 </TITLE>
</HEAD>
<BODY>

<FORM ACTION="phplab4_result.php" METHOD="POST">
Enter a number: <BR>
<INPUT TYPE="TEXT" NAME="yournumber"><BR>
<INPUT TYPE="SUBMIT" VALUE="Go"><BR>
</FORM>

View phplab4.html in your web browser. You should see a spot for entering in a number, and a "Go" button.
Experiment with the above HTML by selectively removing lines and seeing what happens. Answer the following questions:
- Which line of HTML causes the "input box" to appear on your web page?
- Which line of HTML causes the "go button" to appear on your web page?
- Change the "Go" button so it instead says "Do it". What did you need to change? Change it back to "Go".
Type a number into the box, then click the "Go" button. You should receive an error message. Answer the following question:
- What kind of error message to you receive? Why?

Now create in Notepad a new file called "phplab4_result.php", and enter into it the following:


<HTML>
<HEAD>
<TITLE>PHP lab 4 results </TITLE>
</HEAD>

<BODY>
<?php
	print("Here is your number: $yournumber <BR>");
	$square = $yournumber*$yournumber;
	print("Here is your number squared: $square <BR>");
?>

</BODY>
</HTML>

Now try your phplab4.html web page again, type in a number, then click the "Go" button. If all goes correctly, you should see a new web page that does some calculations based on your numbers.
Here is a final exercise:
- Modify the form to ask for two numbers. Then modify phplab4_result.php to print out the product of the two numbers.

PHP Lab #4: Simple forms

Page by Michelle Phillips, Jeff Ondich, and Dave Musicant. Last updated 10.03.02