如何使用Drupal 7返回并获取JSON数据

Question

card.module

drupal_add_js('jQuery(document).ready(function () {

  currentRequest = $.ajax({
  timeout:0,
  cache: false,
  url: pageUrl,
  dataType: "json",
  type: "GET",
  success: function(data){
  $("#edit-field-currency-type-und-0-value").val(data.currency);

  }

});

ajax request module

$items['mccurr/%'] = array(
'title' => '', 
'page callback' => 'ajax_currency_type', 
'access arguments' => array('access content'), 
'page arguments' => array(1),
'type' => MENU_SUGGESTED_ITEM,
);

function ajax_currency_type($ccode){
 drupal_add_http_header('Content-Type', 'application/javascript; utf-8');
$query = "SELECT countries_country.currency 
        FROM countries_country
        WHERE countries_country.iso2 = '".$ccode."'";
$data = db_query($query);

return  drupal_json_encod($data);
}

Is this way correct to return the json data else how can i get the return data back in my car.module.

Thank You

Answer 1

In your page callback function, print the drupal_json_encode 'd string instead of return ing it.

print drupal_json_encode($data);
exit;

Note that you module has security problems that you might need to understand first.

<?php
$items['mccurr/%'] = array(
  'title' => '', 
  'page callback' => 'ajax_currency_type', 
  'access arguments' => array('access content'), 
  'page arguments' => array(1),
  'type' => MENU_SUGGESTED_ITEM,
);

function ajax_currency_type($ccode){
  drupal_add_http_header('Content-Type', 'application/javascript; utf-8');
  $query = 'SELECT currency FROM countries_country WHERE countries_country.iso2 = :code'; // doesn't matter multi lines 
  $data = db_query($query, array(':code' => $ccode)); // Parameters, baby!
  // You will probably need to fetchAllAssoc() or something to get the data in the desired format. Also try to send proper headers on empty results, etc
  print  drupal_json_encode($data);
  exit;
}

With this code, your module will print the json encoded string and no other HTML will be in the output. Note that this is no the best way to do this. See the menu router definition of system/ajax path and pay attention to delivery callback there.