function calls in php

Anon

Can we call php functions in events of html document objects. I want to show some value in second text box in onblur event of first text box.But the function body has to be in PHP.

<?
function calc($a)
{
echo "ttt";
}
echo "<FORM NAME=\"test\" ACTION=\"TEST1.PHP\" METHOD=\"POST\">";
echo "<INPUT TYPE=\"TEXT\" NAME=\"one\">";
echo "<INPUT TYPE=\"TEXT\" NAME=\"two\" onfocus=echo \"hhh\";>";
echo "</form>";
?>
What is mistake in this code?
Please mail me.

mithril

Suman,

I'm not really sure where the calc() method comes into your example, but the "onfocus echo" bit is doomed to failure. PHP is a server-side tech. and requires the browser to be refreshed to display new information. This is because the PHP code needs to be interpreted by the interpreter on the server.

The form is trying to make the browser interpret a PHP echo statment as a JavaScript function or statement. Since PHP isn't JavaScript, JavaScript is logically throwing an error. If you're intending on trying to call the calc() method with onfocus, that's also not going to work unless calc() is a JavaScript function.
To use calc() in PHP, you need to call and use it in the body of the script which is passed to the interpreter on the server. As far as the the browser is concerned, calc() doesn't exist since it (the browser) never gets to see the PHP code, only the HTML output resulting from the PHP code.

Does this answer your question?

Geoff A. Virgo

Anon

Actually my situation is this.
I have 2 input text boxes. Second text box will have data acording to the first text box. So after moving from first text box (may be Onblur), second text box will have data from database in reference to data of first text box. How can I achieve that?
Waiting for help

mithril

Suman

To achieve it using PHP only, your user must submit the form with the first box so PHP can process it and return the form with the second box filled. JavaScript tricks like OnFocus, OnBlur, etc. will never work since they don't actually submit anything to the server, 'tis the nature of the beast🙂 You may be able to do it using a combination of JavaScript and PHP, but you'd have to make the JavaScript do the talking to the database needed to get the value for the second box. I'm pretty sure that JavaScript doesn't do databases🙂. HTH.

Cheers,

Geoff A. Virgo