Drupal 7 における jQuery

Drupal 7 では jQuery の振る舞いがちょっと Drupal 6 のそれとは異なるようで、少し手こずりました。

まず、通常 Drupal.behaviors で jQuery の全コードを囲むと思いますが、Drupal 6 では


Drupal.behaviors.module_name = function(context) {
  your code goes here...
};

となっていたことと思いますが、Drupal 7 では


Drupal.behaviors.module_name = {
  attache: function(context) {
    your code goes here...
  }
};

という風に変わります(参照:Converthing 6x modules to 7.x - Changed Drupal.behaviors ...

また、通常 jQuery では、以下のように $(ドルサイン)を使ってコマンドを書き始めます。


$(document).ready(function() {
  alert("Hello World");
};

しかし、Drupal 7 に含まれる jQuery では、この $ マークで jQuery コマンドを書き始めるということができないようです。

この問題を解決するには2通りの方法があります。1つ目は、$ の代わりに jQuery という文字列を用いるというものです。


jQuery(document).ready(function() {
  alert("Hello World");
};

もう一つは、以下のように jQuery のコード全体を囲う、というものです。(参考:Converting 6.x modules to 7.x - JavaScript should be compatible with other libraries than jQuery


(function($) {
  $(document).ready(function() {
    alert('Hello World.');
  })
})(jQuery)

以上をまとめると、Drupal 7 向けに jQuery を使うには、以下のようにするのが基本、と言えそうです。(コメント文からした3行は任意に書き換える)


Drupal.behaviors.your_module = {
  attach: function(context) {
    (function($) {
      // your code goes here ...
      $(document).ready(function() {
        alert('Hello World.');
      })
    })(jQuery)
  }
}

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