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form_for remote:true の時にajax:failure、ajax:loadingがコールされない

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ハマりまくって時間を食ってしまったが、ようするにイベントの名前が違うらしい。この名前変更っていつ起きたものなのだろうか。読んだ資料が古かったんだろう。

http://stackoverflow.com/questions/6004189/rails-remote-form-callback-ajaxloading-does-not-fire-others-do
によるとajax:[jqueryでのイベント名]っぽい。実際のソースをたぐってみると下記のように書いてあった。

       options = {
          type: method || 'GET', data: data, dataType: dataType,
          // stopping the "ajax:beforeSend" event will cancel the ajax request
          beforeSend: function(xhr, settings) {
            if (settings.dataType === undefined) {
              xhr.setRequestHeader('accept', '*/*;q=0.5, ' + settings.accepts.script);
            }
            return rails.fire(element, 'ajax:beforeSend', [xhr, settings]);
          },
          success: function(data, status, xhr) {
            element.trigger('ajax:success', [data, status, xhr]);
          },
          complete: function(xhr, status) {
            element.trigger('ajax:complete', [xhr, status]);
          },
          error: function(xhr, status, error) {
            element.trigger('ajax:error', [xhr, status, error]);
          },
          crossDomain: crossDomain
        };
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