<?php
namespace App\Traits;
 
// To set $locale value of a model and translate all translatable attributes
trait AjaxResponse
{
    protected function success_response($data, $extra=null){
        $response = [
            'status' => 'success', 
            'data' => $data, 
            'extra' => $extra
        ];

        //header('Content-Type: application/json');
        //echo json_encode($response);
        //exit();
        return response()->json($response);
    }

    protected function fail_response($msg, $code=0){
        $response = [
            'status' => 'fail', 
            'code' => $code, 
            'message' => $msg
        ];

        //header('Content-Type: application/json');
        //echo json_encode($response);
        //exit();

        return response()->json($response);
    }

    protected function error_response($errors, $msg='網路錯誤'){
        $response = [
            'message' => $msg,
            'errors' => $errors
        ];

        return response()->json($response, 422);
    }

    protected function datatable_response($total, $filtered_total, $data=[], $draw=0){
        $out = array();
        $out['draw'] = $draw;
        $out['recordsTotal'] = $total;
        $out['recordsFiltered'] = $filtered_total;
        $out['data'] = $data;
     
        return response()->json($out);
    }
}

Javascript

$.ajax({
	type: 'post',
	url: base_url + 'member/signup_save',
	data: params,
	dataType: 'json',
	success: function(data){
		if(typeof data.status == 'undefined'){
			alert(data);
		}else if(data.status == 'fail'){
			alert(data.message);
		}else{
			//console.log(data);
			alert('新增成功');
		}
	},
	error: function(data){
		var errors = data.responseJSON;
		show_response_error(errors);
	}
});