Displaying an Alertbox from PHP Controller class

Currently I’m using CodeIgniter and in my controller I have placed a check in the controller. Basically checking if the value of a particular field is 0 or not. Now if it is 0, I want to display an alert popup via my controller. To do this I’ve tried the following code:

public function status($status){ 
        foreach($this->input->post('id') as $key => $id):
            $check_emirate = $this->listings_model->check_emirate($id);
            if($check_emirate->emirate == 0){
                echo "<script>alert('This card was not approved.');</script>";
            $data=array('status'=>$status);  $updated=$this->listings_model->update($data,array(),$id); 
    return true;

Now it is entering my if condition, but it doesnt show me the popup.

This is the AJAX call I’m making to enable this function:

$(".status").click(function(e) { chagestatus($(this)); }

function chagestatus(obj){ 
  if($('.chkbx').is(':checked') == true){
      type: "post",
      dataType: "json",
      url: "<?php echo site_url('listings/status'); ?>/"+obj.data('val'),
      data: $(".chkbx:checked").serialize(),
      success: function(result) {}

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