I have a form with 3 dropdowns - A, B, and C. When A changes, B should be updated with a new list of options and C should be cleared. When B changes, C should be updated with a new list of options.I have a form with 3 dropdowns - A, B, and C. W
阅读背景：
使用Ajax使用observe_field重新加载部分会触发多个事件
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