Does php+javascript work this way?

[mike12255]

<javascript>

 

<php code inside javascript>

 

</javascript>

 

<php>

 

</php>

 

What I am asking is if the php code inside the javascript function will be executed only when the javascript function is called even though the page is already loaded?

[PFMaBiSmAd]

Nope.

 

The php code is executed on the web server when the page is requested. Only the output from the php code would exist inside the javascript when the javascript is executed in the browser.

 

What exact problem are you trying to solve?

 

[mike12255]

I want to auto populate a select field based on the option chosen from the select field above it.

[joe92]

You would use ajax for this.

[mike12255]

i tried (http://www.phpfreaks.com/forums/index.php?topic=345067.0) but I couldnt get it to work.

[joe92]

This is a fairly OK tutorial on GET and POST requests via ajax:

 

http://www.javascriptkit.com/dhtmltutors/ajaxgetpost.shtml

 

You would make the ajax call from your javascript to go to xyz.php script. In there you grab what you sent and then treat it like any other php script doing mysql querys, for loops etc.. At the end of the php echo what you need to return and that will be the responseText in the javascript. Using this responseText, manipulate the page using javascript to show what you need to show.