如何使用javascript删除上一个元素

在检查ff元件时，显示：

<div class="col-md-9" style="padding-top:7px;">
<%= week_calendar number_of_weeks: 4, events: @food_plans do |date, food_plans| %>
  <%= date.day %>
  <%= link_to '+', food_plans_path(abc: date),:method=> :post,:style=>"color:black;visibility:visible;float:right;font-weight:700;font-size:17px;",:class=>"linkplus"%>
  <% food_plans.each do |food_plan| %>
  <%if food_plan!=nil%>
  <%= link_to 'x', food_plan,:style=>"color:black;visibility:visible;float:right;font-weight:700;font-size:14px;",:class=>"linkx", method: :delete, data: { confirm: 'Are you sure?' } %>
  <%end%>
  <div >
  <!-- Displays proper collection select-->
  <%if food_plan.meal==nil%>
  <%=collection_select(:post, :food_plan_id, Meal.all, :name, :name, {prompt: '---'}, {:id=>"fsel", :onchange=>"window.location='#{meal_select_path(food_plan.id)}?meal=' + this.value"})%>
  <%else%>
  <%=collection_select(:post, :food_plan_id, Meal.all, :name, :name, {selected: food_plan.meal}, {:id=>"fsel", :onchange=>"window.location='#{meal_select_path(food_plan.id)}?meal=' + this.value"})%>
  <%end%>

  </div>
  <%end%>
<% end %>
</div>

我只想删除

linkplus

前面的

linkx

显示的代码删除

linkplus

元素之前或之后的元素，而不是这些元素本身

以下是如何完成您在上述引用声明中提出的要求：

<a style="color:black;visibility:visible;float:right;font-weight:700;font-size:17px;" class="linkplus" rel="nofollow" data-method="post" href="/food_plans?abc=2016-05-09">+</a>
<a style="color:black;visibility:visible;float:right;font-weight:700;font-size:14px;" class="linkx" data-confirm="Are you sure?" rel="nofollow" data-method="delete" href="/food_plans/7">x</a>

---

您确定

$（'.linkplus'）

有上一个元素吗？也许您可以为此添加html。请显示生成的html，而不是服务器端代码。您发布的代码将删除以前的元素，前提是它有一个。您可以（也应该）通过首先运行

console.log（$（'.linkplus'）.prev（）.length）来调试它

在其中放置一个断点，然后在控制台中尝试$（'.linkplus'）.prev（），查看它返回的内容。在html中，第一个

标记是

linkplus

，因此它没有前面的元素。因此，

.prev（）.remove（）

没有做任何事情，这与预期相符。您能否指出这是否回答了您的问题？

<script type="text/javascript">
    $(document).ready(function(){
        $('.linkplus').prev().remove();
    });
</script>

<%= link_to '+', food_plans_path(abc: date),:method=> :post,:style=>"color:black;visibility:visible;float:right;font-weight:700;font-size:17px;",:class=>"linkplus"%>

<div class="col-md-9" style="padding-top:7px;">
<%= week_calendar number_of_weeks: 4, events: @food_plans do |date, food_plans| %>
  <%= date.day %>
  <%= link_to '+', food_plans_path(abc: date),:method=> :post,:style=>"color:black;visibility:visible;float:right;font-weight:700;font-size:17px;",:class=>"linkplus"%>
  <% food_plans.each do |food_plan| %>
  <%if food_plan!=nil%>
  <%= link_to 'x', food_plan,:style=>"color:black;visibility:visible;float:right;font-weight:700;font-size:14px;",:class=>"linkx", method: :delete, data: { confirm: 'Are you sure?' } %>
  <%end%>
  <div >
  <!-- Displays proper collection select-->
  <%if food_plan.meal==nil%>
  <%=collection_select(:post, :food_plan_id, Meal.all, :name, :name, {prompt: '---'}, {:id=>"fsel", :onchange=>"window.location='#{meal_select_path(food_plan.id)}?meal=' + this.value"})%>
  <%else%>
  <%=collection_select(:post, :food_plan_id, Meal.all, :name, :name, {selected: food_plan.meal}, {:id=>"fsel", :onchange=>"window.location='#{meal_select_path(food_plan.id)}?meal=' + this.value"})%>
  <%end%>

  </div>
  <%end%>
<% end %>
</div>

<a style="color:black;visibility:visible;float:right;font-weight:700;font-size:17px;" class="linkplus" rel="nofollow" data-method="post" href="/food_plans?abc=2016-05-09">+</a>
<a style="color:black;visibility:visible;float:right;font-weight:700;font-size:14px;" class="linkx" data-confirm="Are you sure?" rel="nofollow" data-method="delete" href="/food_plans/7">x</a>

$('.linkx').prev('.linkplus').remove();