从下拉列表中选择"OTHERS"选项,创建文本字段Ruby on Rails-4.2 [英] Select 'OTHERS' option from drop down list creating text field Ruby on Rails - 4.2
问题描述
_form.html.erb
_form.html.erb
<div class="form-group">
<%= f.label :description %><br>
<%= f.select(:description, options_for_select([['', ''],['METRO', 'METRO'], ['BUS', 'BUS'], ['TAXI', 'TAXI'], ['OTHERS', 'OTHERS']]), {}, {class: "form-control", id: "expense_description"}) %>
<br>
<div id="otherDesc">
<%= f.text_field :description_other, class: "form-control" %>
</div>
</div>
index.html.erb
index.html.erb
<% @expenses.each do |expense| %>
<tr class="tr-<%= cycle('odd', 'even') %>">
<td class="col-1"><%= (expense.description_other.present? ? expense.description_other : expense.description) %></td>
</tr>
<% end %>
expenses_controller.rb
expenses_controller.rb
class ExpensesController < ApplicationController
before_action :set_expense, only: [:show, :edit, :update, :destroy]
# GET /expenses
# GET /expenses.json
def index
@expenses = Expense.all
end
# GET /expenses/1
# GET /expenses/1.json
def show
end
# GET /expenses/new
def new
if Expense.last.present?
@expense = Expense.last.dup
else
@expense = Expense.new
end
end
# GET /expenses/1/edit
def edit
end
# POST /expenses
# POST /expenses.json
def create
@expense = Expense.new(expense_params)
respond_to do |format|
if @expense.save
format.html { redirect_to @expense, notice: 'Expense was successfully created.' }
format.json { render :show, status: :created, location: @expense }
else
format.html { render :new }
format.json { render json: @expense.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /expenses/1
# PATCH/PUT /expenses/1.json
def update
respond_to do |format|
if @expense.update(expense_params)
format.html { redirect_to @expense, notice: 'Expense was successfully updated.' }
format.json { render :show, status: :ok, location: @expense }
else
format.html { render :edit }
format.json { render json: @expense.errors, status: :unprocessable_entity }
end
end
end
# DELETE /expenses/1
# DELETE /expenses/1.json
def destroy
@expense.destroy
respond_to do |format|
format.html { redirect_to expenses_url, notice: 'Expense was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_expense
@expense = Expense.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def expense_params
params.require(:expense).permit(:description, :description_other)
end
end
expense.js
expense.js
$(document).ready(function () {
$('#expense_description').on('change',function(){
var selectedValue = $(this).val();
selectedValue == "OTHERS" ? $("#otherDesc").show() : $("#otherDesc").hide()
});
});
general.scss
general.scss
#otherDesc {
display:none;
}
一切正常,除了我的索引页面外,在该页面上我获得了"OTHERS"选定选项的两个值,即"OTHERS + MY OWN description".例如,在图像中为OTHERS WHITE GLUE.但是我只想用白胶做为描述.
Everything works fine except my index page where I get two values for 'OTHERS' selected option as OTHERS + MY OWN DESCRIPTION. For example in the image it is OTHERS WHITE GLUE. But I would like to have only WHITE GLUE as the description.
请在附件中找到图片以供参考.
Please find attached the image for your reference.
我已经尽力了,但是无法获得想要的结果.
I have tried too hard but unable to get the desired result.
任何建议都是最欢迎的.
Any suggestions are most welcome.
谢谢.
推荐答案
找到了-有时候我有点盲目...
Found it - I'm kind of blind sometimes...
index.html.erb
<td class="col-1"><%= expense.description %> <%= link_to expense.description_other,{}, {:style => 'color: #CC3366'} %></td>
您那里有两个<%= ... %>
...
You've got two <%= ... %>
's in there ...
<%= expense.description %>
然后
<%= link_to expense.description_other,{}, {:style => 'color: #CC3366'} %>
选择了OTHER
后,使用if条件语句(我们讨论过的<expression> ? <if true do this happens>: <if false this happens>
三元运算符,条件语句必须在一个<%= ... %>
块中包含两个语句)来获取第一个语句.
Get ride of the first one when OTHER
is selected, using an if conditional(the trinary operator we talked about <expression> ? <if true do this happens>: <if false this happens>
The conditional would have to contain both statements inside one <%= ... %>
block.
此外,您在这里遇到问题...应该有某种条件...可能是||=
&放下Expense.new或Expense.last.dup
Also, you have an issue here ... should have a conditional of some sort ... probably the ||=
& drop the Expense.new or the Expense.last.dup
def new
@expense = Expense.new
@expense = Expense.last.dup
end
这篇关于从下拉列表中选择"OTHERS"选项,创建文本字段Ruby on Rails-4.2的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!