在我的Ruby on Rails应用程序中，我有汽车价格表。该表具有以下输入：
我有以下HTML代码（我将其转换为HAML以便更具可读性）
%table.table.table-striped.table-bordered
%thead
%tr
%th
Od [Liczba dni]
%th
Do [Liczba dni]
%th
Cena netto
%th
Cena brutto
%th
%tbody#prices
%tr.nested-fields
%td
.form-group.integer.optional.car_prices_from_days
%input#car_prices_attributes_0_from_days.numeric.integer.optional.form-control.form-control{name: "car[prices_attributes][0][from_days]", step: "1", type: "number", value: "1"}/
%td
.form-group.integer.optional.car_prices_to_days
%input#car_prices_attributes_0_to_days.numeric.integer.optional.form-control.form-control{name: "car[prices_attributes][0][to_days]", step: "1", type: "number", value: "12"}/
%td
.form-group.string.optional.car_prices_netto_price
%input#car_prices_attributes_0_netto_price.string.optional.form-control{min: "0", name: "car[prices_attributes][0][netto_price]", type: "text", value: "123,00"}/
%td.brutto
.form-group.string.optional.car_prices_brutto_price
%input#car_prices_attributes_0_brutto_price.string.optional.form-control{min: "0", name: "car[prices_attributes][0][brutto_price]", type: "text", value: "151,29"}/
%td.remove
%input#car_prices_attributes_0__destroy{name: "car[prices_attributes][0][_destroy]", type: "hidden", value: "213"}/
%a.delete.remove_fields.existing{href: "#", style: "display: none;"}
%span.glyphicon.glyphicon-remove
%input#car_prices_attributes_0_id{name: "car[prices_attributes][0][id]", type: "hidden", value: "213"}/
%tr.nested-fields
%td
.form-group.integer.optional.car_prices_from_days
%input#car_prices_attributes_1406871212209_from_days.numeric.integer.optional.form-control.form-control{name: "car[prices_attributes][1406871212209][from_days]", step: "1", type: "number"}/
%td
.form-group.integer.optional.car_prices_to_days
%input#car_prices_attributes_1406871212209_to_days.numeric.integer.optional.form-control.form-control{name: "car[prices_attributes][1406871212209][to_days]", step: "1", type: "number"}/
%td
.form-group.string.optional.car_prices_netto_price
%input#car_prices_attributes_1406871212209_netto_price.string.optional.form-control{min: "0", name: "car[prices_attributes][1406871212209][netto_price]", type: "text", value: "0,00"}/
%td.brutto
.form-group.string.optional.car_prices_brutto_price
%input#car_prices_attributes_1406871212209_brutto_price.string.optional.form-control{min: "0", name: "car[prices_attributes][1406871212209][brutto_price]", type: "text", value: "0,00"}/
%td.remove
%input#car_prices_attributes_1406871212209__destroy{name: "car[prices_attributes][1406871212209][_destroy]", type: "hidden", value: "false"}/
%a.delete.remove_fields.dynamic{href: "#"}
%span.glyphicon.glyphicon-remove
现在我想建立这样的功能：
我会非常感谢任何帮助，因为我已经卡住了......
我的代码：
$("input#car_prices_attributes_0_netto_price").change ->
value = (@.value * 0.23)
brutto = $("input#car_prices_attributes_0_netto_price").closest($('[id*="brutto_price"]'))
brutto.val(value)
我只是尝试在netto_price输入时执行此操作，以便在netto_price_input更改时更新brutto_price输入。但我对这个最接近的方法有疑问。它无法正常工作。
编辑： 任何人都可以根据netto_price输入值修改我的代码来设置brutto_price输入值吗？
答案 0 :(得分：1)
以下是您的答案，您需要向td和netto字段的父brutto添加课程，如代码所示。
%table.table.table-striped.table-bordered
%thead
%tr
%th Od [Liczba dni]
%th Do [Liczba dni]
%th Cena netto
%th Cena brutto
%th
%tbody#prices
%tr.nested-fields
%td
.form-group.integer.optional.car_prices_from_days
%input#car_prices_attributes_0_from_days.numeric.integer.optional.form-control.form-control{class: "/>{name:"}>/
[prices_attributes][0][from_days] ", step: "1 ", type: "number ", value: "1 "}/
%td
.form-group.integer.optional.car_prices_to_days
%input.numeric.integer.optional.form-control.form-control{id: "car_prices_attributes_0_to_days "}>/
{name: "car[prices_attributes][0][to_days] ", step: "1 ", type: "number ", value: "12 "}/
%td.netto
.form-group.string.optional.car_prices_netto_price
%input.string.optional.form-control{id: "car_prices_attributes_0_netto_price "}>/
{min: "0 ", name: "car[prices_attributes][0][netto_price] ", type: "text ", value: "123,00 "}/
%td.brutto
.form-group.string.optional.car_prices_brutto_price
%input.string.optional.form-control{id: "car_prices_attributes_0_brutto_price "}>/
{min: "0 ", name: "car[prices_attributes][0][brutto_price] ", type: "text ", value: "151,29 "}/
%td.remove
%input{id: "car_prices_attributes_0__destroy "}>/
{name: "car[prices_attributes][0][_destroy] ", type: "hidden ", value: "213 "}/
%a.delete.remove_fields.existing
{href: "# ", style: "display: none; "}
%span.glyphicon.glyphicon-remove
= succeed "{name:" do
%input{id: "car_prices_attributes_0_id "}/
%tr.nested-fields
%td
.form-group.integer.optional.car_prices_from_days
%input.numeric.integer.optional.form-control.form-control{id: "car_prices_attributes_1406871212209_from_days "}>/
{name: "car[prices_attributes][1406871212209][from_days] ", step: "1 ", type: "number "}/
%td
.form-group.integer.optional.car_prices_to_days
%input.numeric.integer.optional.form-control.form-control{id: "car_prices_attributes_1406871212209_to_days "}>/
{name: "car[prices_attributes][1406871212209][to_days] ", step: "1 ", type: "number "}/
%td.netto
.form-group.string.optional.car_prices_netto_price
%input.string.optional.form-control{id: "car_prices_attributes_1406871212209_netto_price "}>/
{min: "0 ", name: "car[prices_attributes][1406871212209][netto_price] ", type: "text ", value: "0,00 "}/
%td.brutto
.form-group.string.optional.car_prices_brutto_price
%input.string.optional.form-control{id: "car_prices_attributes_1406871212209_brutto_price "}>/
{min: "0 ", name: "car[prices_attributes][1406871212209][brutto_price] ", type: "text ", value: "0,00 "}/
%td.remove
%input{id: "car_prices_attributes_1406871212209__destroy "}>/
{name: "car[prices_attributes][1406871212209][_destroy] ", type: "hidden ", value: "false "}/
%a.delete.remove_fields.dynamic
{href: "# "}
%span.glyphicon.glyphicon-remove
之后添加这样的咖啡代码：
$ ->
$(".netto input").change ->
netto_price = @value
value = ((netto_price * 0.23) + netto_price)
brutto = $(this).closest(".nested-fields").find(".brutto input")
brutto.val value
$(".brutto input").change ->
brutto_price = @value
value = (brutto_price - (brutto_price * 0.23))
netto = $(this).closest(".nested-fields").find(".netto input")
netto.val value
工作fiddle