PHP within JavaScript

Question

I have the following code:

  private function html_Headers()
    {
        $data = '
        <!DOCTYPE HTML>
        <head>
    <script type="text/javascript">
    function getOptions(chosen){
    var selbox = document.myform.selectport;
  selbox.options.length = 0;
  if (chosen == "1") {
    selbox.options[selbox.options.length] = new Option("-----------------","0");
    }


    }
    </script>

    </head>';

I'm trying to run some php mysql queries within the getOptions() JS function. I tried writing tags but it didn't work. Does anyone see the problem here? Note that this is within a PHP class file.

I've spotted the problem: Your code is incomplete. Also.. You cannot directly run any serverside code (PHP) within a HTML document (JS), without sending a request to the server. — Rob W
– Rob W, Commented Oct 6, 2011 at 20:36
maybe this is what you are looking for : stackoverflow.com/questions/6786640/… — tereško
– tereško, Commented Oct 6, 2011 at 20:47

GNi33 · Accepted Answer · 2011-10-06 20:43:05Z

JavaScript is executed on the client, while PHP is interpreted on the server. That means: when the javascript is executed, your code is running already on the client side and PHP - Code is going to be pretty useless.

What you can do, is calling an PHP-file with a function over an AJAX-Call and parse the result back to the client. After this, you can do anything with the returned data, but you'll have to do it within JavaScript.

For AJAX-Calls, I usually use jQuery, because the calls are easy and browser differences are handled already for you.

$.ajax({
  type: "POST",         // POST or GET
  url: "query.php",     // the php-file, including your mysql query
  data: "name=John&location=Boston",  //data sent to the server (in this case as post-param)
  success: function(data){
    //function executed, when the call succeeds. variable data is the data returned from your php
  }
});

Of course, you can make AJAX-Calls without using jQuery, maybe you should have a look at quirksmode.org

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