Question

我写了一个rails表单，它工作正常，直到我添加了一个javascript。此javascript汇总了用户输入的字段值，并将其保存在总字段中，因此用户无需手动累计它。

这是我的代码：

<script type="text/javascript">
  function findTotal(){
    console.log("this is working")
      var arr = document.getElementsByName('qty');
      var tot=0;
      for(var i=0;i<arr.length;i++){
          if(parseInt(arr[i].value))
              tot += parseInt(arr[i].value);
      }
      document.getElementById('total').value = tot;
  }
</script>
<%= bootstrap_form_for(@payment) do |f| %>
  <div class="field">
    <%= f.text_field :student_id,label: "Admission Number of Student" %>
  </div>
  <div class="field">
    <%= f.number_field :tuition_fee , onblur: "findTotal()", id: "qty1", name: "qty" %>
  </div>
  <div class="field">
    <%= f.number_field :fine, onblur: "findTotal()", id: "qty2", name: "qty" %>
  </div>
  <div class="field">
    <%= f.number_field :previous_books, onblur: "findTotal()", id: "qty3", name: "qty" %>
  </div>
  <div class="field">
    <%= f.number_field :annual_fund, onblur: "findTotal()", id: "qty4", name: "qty" %>
  </div>
  <div class="field">
    <%= f.hidden_field :total, name: "total",  id: "total" %>
  </div>
  <div class="actions">
    <%= f.submit  class: "btn btn-success" %>
  </div>
<% end %>

现在，当我填写表单时，该功能正常工作，并且提交按钮也会创建记录，但在这些数字字段中输入的所有值都不会存储在数据库中，并且显示为nil。如果我从数字字段中删除它，这些工作正常。知道我做错了什么吗？谢谢。编辑：这是我的参数：

   private
    # Use callbacks to share common setup or constraints between actions.
    def set_payment
      @payment = Payment.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def payment_params
      params.require(:payment).permit(:student_id, :section_id, :year, :month, :date, :payment_mode, :tuition_fee, :fine, :previous_books, :annual_fund, :total)
    end
end

和相关的控制器方法：

  def create
    @payment = Payment.new(payment_params)
    @payment.student_id = Student.find_by_admission_number(@payment.student_id).id
    @payment.section_id = Student.find(@payment.student_id).section_id

    respond_to do |format|
      if @payment.save
        format.html { redirect_to new_payment_path, notice: 'Payment Record was successfully created.' }
        format.json { render :show, status: :created, location: @payment }
      else
        format.html { render :new }
        format.json { render json: @payment.errors, status: :unprocessable_entity }
      end
    end
  end

Answer 1

问题是您要覆盖'name'属性。它们应该像，例如：name="payment[fines]"。因此，当您提交时，它会生成以下对象：

Parameters=> { payment => { fines: value} }

这是在您的控制器（payment_params）

中指出的

rails - 添加JavaScript函数以形成字段而不保存数据库中的字段值

1 个答案: