kilbot

From what I can gather you wish to output some parameters and use them in you ajax call. The way most developers will do this is to create a global variable. For example, WordPress adds global variables ajaxurl, pagenow, adminpage etc to every WP Admin page. Cluttering the global namespace is also bad practice but it’s certainly better than overwriting a global function.

So you could do something like:

<script>
var polylang = {
  foo: 'bar',
  baz: true
};
</script>

These parameters will be attached to the global window so you can now access them from within your js function, eg:

(function($) {
  var data = {
    action: 'ajax_action',
    security: 'nonce',
    foo: polylang.baz ? polylang.foo : 'default';
  };
  $.post( ajaxurl, data, function( resp ) {
    alert( "Response: " + resp );
  });
})(jQuery);

As one last illustration of why overwriting the global jquery functions is bad practice please consider this situation: Another plugin author, let’s call him Leroy, has created a Super Awesome Plugin. Leroy also wants to add parameters to every ajax call so he uses $.ajaxPrefilter. Leroy uses admin_print_footer_scripts on every page, just like you do, except he uses priority 11, so his script executes just after yours. Now Leroy has overwritten your $.ajaxPrefilter. It’s not like WP filters where things get chained, Leroy has just stomped on your prefilter. Leroy is a c**t.