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<%= observe_form :date_range_filter,
:frequency=>0.5,
:update=>'perfomance',
:url=>{:action=>'filter_date_range'},
:before => "startLoad('perfomance');",
:complete => "stopLoad('perfomance');" %>
我有兩個領域:date_after和date_beforeRuby on Rails:如何讓observe_form在更新之前等待兩個字段被填充?
我怎麼觀察者等到都有數據?