How do I pass form data to PHP and return a json string to Javascript?

Solution:

In the radio button on click event place a javascript function that will perform an XMLHttpRequest to the php page and have the PHP page echo some JSON content that can be decoded in the return of the XHR in Javascript.

Example of such

Solution:

May this can help you. I think that you must do an Ajax request

$.ajax({
    method: "POST",
    url: "some.php",
    data: { name: "John", location: "Boston" }
})
.done(function( data) {
    alert( "Data Saved: " + data);
});
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You send data to server form your form (here sent arename andlocation). You read this data with javascript with OnSelect and transfert it to your PHP code and, You get back data from server into your JavaScript code and you can do what you want with it. Sorry if my solution use JQuery, it is better for cross-browser with less code writing !

Solution:

You could use this line to parse an array into json and use it later in javascript:

json_encode($rows); //format array named $rows into json data
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More info: http://php.net/manual/en/function.json-encode.php