Textbox updated by another textbox data

[Scope72]

I have 2 textboxes (txtPrice, txtPercent).  What I need to do, is update the txtPrice box without submitting the page/form. 

 

When the txtPercent is changed, I would like to call a function which would then take the txtPrice value and multiply it by txtPercent and add that back into the txtPrice.  Then I need to update the txtPrice box without submitting the page.

 

<td align="right"><?php print "Price" ?>:</td><td><input type="text" name="txtPrice" size="15" value="<?php print $txtPrice?>"  />

<td align="right"><?php print "Percent" ?>:</td><td><input type="text" name="txtPercent" onChange="updatePrice()" size="15" value="<?php print $txtPercent?>"  />

 

function updatePrice(txtPrice, txtPercent){

       

        var newPrice;     

        newPrice = (txtPrice * txtPercent) + txtPrice; 

        document.GetElementById('txtPrice').value = newPrice   

}

 

Thanks in advance for any help.

[xyph]

You want JavaScript for this.

 

PHP is purely server-side. If you want server-side interaction, a client must submit information.

[Scope72]

Would you know of any good examples that would show how to do this?

[xyph]

http://homepage.ntlworld.com/kayseycarvey/variables3.html

[Scope72]

Thank you for your help.  With the website and a little more digging I was able to get it to work.

[xyph]

Perfect, glad you could get this cleaned up on your own