coffeescript で、formのajax送信

xxxx.coffee.js

  init_like_button: ->
    forms = $(".new_article_user")
    forms.submit (ev,f) =>
      ev.preventDefault()
      form = $(ev.target)
      num = form.parent().parent().find($(".num"))[0].textContent
      $.post form.attr("action"),form.serialize()
        ,(data) =>
		      if form.find(".submit_button").length == 0
		        form.find(".no_submit_button")[0].className = "submit_button"
		        form.parent().parent().find($(".num"))[0].textContent = parseInt(num)-1
		      else
		        form.find(".submit_button")[0].className = "no_submit_button"
		        form.parent().parent().find($(".num"))[0].textContent = parseInt(num)+1

ある一定の条件を確認してから、送信したい場合。
例：特定のinput form にカーソルがある場合で場合分け

xxxx.coffee.js

  init_submit_form: =>
    form = $("#spot_create_form")
    form.bind "submit",(ev) =>
      now_focus = $(":focus").attr("id")
      if now_focus is "search_location"
        #特定の処理
        return false
      else
        return true