example.js

function billing() {
  $.getJSON( "/api", { 
      action: "get_billing",
  }).done(function( json ) {
      if (json['error']) {
         $.alert(json['error'], "Error");
      } else {
        $("#billing_dialog").html(json['data']).dialog({width:760,height:550,buttons: [
      		{
      			text: "Ok",
      			click: function() {
      				$( this ).dialog( "close" );
      			}
       		}]}).dialog("open");       
          if (ga) {
            ga('send', 'pageview', 'billing');      
          }  
       		    
      }
  }).fail(function( jqxhr, textStatus, error ) {
      var err = textStatus + ", " + error;
      console.log( "Request Failed: " + err );
  });
}