这个Jquery脚本出了什么问题？

Trying to populate a drop down list for cities once a user makes a selection for the state using Jquery/Ajax functionality

HTML Form has...

  <?php $allRegions = Region::newInstance()->getStatesByCountry('US'); ?>



     <select name="regionId" id="regionId">

     <?php foreach($allRegions as $region) { ?>
     <option value="<?php echo $region['value'] ; ?>"><?php echo $region['name'] ; ?></option>
     <?php } ?>
     </select> 

       <select name="cityId" id="cityId">Choose a city</select>     

Jquery code...

    $(document).ready(function(){



  $("#regionId").change( function() {

  var regionId = $(this).val();

  var url = '<?php echo site_base_url(true)."?page=ajax&action=cities&regionId="; ?>' + regionId;

  $.ajax({
  type: "GET"
  url: url,
  dataType: 'json',
  success: function(msg){
  if (msg != ”){
  $("#cityId").html(msg).show();

  }

  }
  });
  });
  });
  </script>

The issue is that on selecting a region the cities drop down select doesn't get populated ... can't figure it out.. any help is appreciated.

One problem is that you have a strange quote character:

if (msg != ”){

You probably mean this:

if (msg != ''){

and another problem is:

  type: "GET"

that should be:

  type: "GET",

Not to be rude, but your code is very nested, and unecessary complicated. Fix all the mentions above from the others, and also this:

 <?PHP
 foreach($allRegions as $region) {
 <option value="<?php echo $region['value'];" . "><" . echo $region['name']; .
 "</option>" } ?>
 </select>