Question
I'm trying to calculate factorial of a number in PHP. I've got two text boxes: 1) for number 2)for result(the factorial of the number)
When I click submit, I want the result in the textbox of result.How can I make it happen.
https://stackoverflow.com/questions/21404241
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Russian<html>
<title>Factorial</title>
<body>
<form name="f1" method="POST">
number :<input type="text" name="T1">
factorial :<input type="text" name="T2" >
<input type="submit" name="submit">
</body>
</html>
<?php
if(isset($_POST['submit']))
{
$num=$_POST['T1'];
$fact=1;
while($num>0)
{
$fact=$fact*$num;
$num--;
}
//code for writing result to the textbox.
}
?>
Solution
Try this:
<?php
if(isset($_POST['submit']))
{
$num=$_POST['T1'];
$fact=1;
while($num>0)
{
$fact=$fact*$num;
$num--;
}
//code for writing result to the textbox.
}
?>
<html>
<title>Factorial</title>
<body>
<form name="f1" method="POST">
number :<input type="text" name="T1" value="<?php isset($num) ? $num : ''?>">
factorial :<input type="text" name="T2" value="<?php isset($fact)? $fact : '';?>">
<input type="submit" name="submit">
</body>
</html>
OTHER TIPS
Do your PHP before the HTML, and then when you get to wherever you want to show it on the page, just add <?php echo $fact; ?>
So maybe something like
<div>
<?php echo $fact; ?>
</div>
Note value="<?php echo $fact; ?>" in factorial input
<?php
$fact ='';
if(isset($_POST['submit']))
{
$num=$_POST['T1'];
$fact=1;
while($num>0)
{
$fact=$fact*$num;
$num--;
}
}
?>
<html>
<title>Factorial</title>
<body>
<form name="f1" method="POST">
number :<input type="text" name="T1">
factorial :<input type="text" name="T2" value="<?php echo $fact; ?>" >
<input type="submit" name="submit">
</body>
</html>
try like this using jQuery call a method to do ur action
function fact(){
//do calculation
$('#id_of_txt_box').val('the value');
}
You can try out similar thing for javascript
You just have to add script tag after calculating factorial
Try this :
echo '<script type="text/javascript">
var s = document.getElementById("t2");
s.value = ' . $fact . ';
</script>';
"t2" is the id of the input element where you wish to put the calculated value.
add this code after calculating factorial within php tags
