Ajax in JavaScript to pass to PHP

**blsn** · 01-07-2013 09:28 AM

I’m using radio buttons (‘countries’) to open dropdown-box of its corresponding ‘cities’.
The variable ‘radioPressed’ detects the selected radio button and I need to pass its value inside my JavaScript to a PHP, as follows:

Code:

<script>
  var radioPressed = 123;
  <?php $what_is_myVar = radioPressed ; ?>
</script>

Since the solution can be complicated, I would ask to receive an advice only regarding the main steps of how to pass the value of 'radioPressed' into $what_is_myVar

Thanks a lot for any assistance,

**cbVision** · 01-07-2013 10:07 AM

Here's an example. I've used "x" instead of radioPressed for the variable.

Code:

<!doctype html>

<html>
	<head>
		<meta http-equiv="content-type" content="text/html; charset=utf-8" />
		<title>Title</title>
		<meta name="language" content="en" />  
		<script type="text/javascript">
			//<![CDATA[  
				function passVariable(){
				
					// set your variable
					var x = '123';
					
					// get the current url and append your variable
					var url = document.location.href + '?x=' + x;
					
					// to prevent looping, check to make sure your current url contains a common string
					var exists = document.location.href.indexOf('?x=');
					if(exists < 0){
						// redirect passing your variable in
						window.location = url;
					}
					
				}
			//]]> 
		</script>
	</head>
	<body onload="passVariable()">
		<?php echo $_REQUEST['x']; ?>
	</body>
</html>

**blsn** · 01-07-2013 11:40 AM

Thanks very much for your professional reply, works perfect but I need to have the PHP variable inside JavaScript, because the PHP code for opening the dropdown-box of matching cities is inside the JavaScript (see below my working script):

Code:

<script type="text/javascript">
$(document).ready(function(){
  $('#locationTree input:radio').change(function() {
    var radioPressed = $('input:radio[name=Region]:checked').val();

    if(radioPressed == 123) {
      var listCities = $("select[name='City']");
      <?php View::newInstance()->_exportVariableToView(123); ?>
      		<?php while(has_list_cities()) { ?>
        	$("<option><?php echo list_city_name(); ?></option>").appendTo(listCities);
      <?php } ?>                
    } 

  });   
});
</script>

In the code above I need to use $_REQUEST['x'] as follows:
<?php View::newInstance()->_exportVariableToView($_REQUEST['x']); ?>

Is there any way to get the PHP variable inside JavaScript?

Your help is greatly appreciated,

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