如何在jQuery中设置下一个元素值

Question

我有一个按钮，在单击事件上我需要设置下一个输入隐藏类型元素的值。我正在尝试下面的代码 -

<span id="clear_promotion_brand_search" class="myButtonClass"><i class="fa fa-times"></i></span>
<span id="error_brand" class="show-error-msg"></span>
<input type="hidden" name="promotion_brand_id" value="" data-id="brand" class="search-id is-validate form-fields-value">

$(document).on('click','.myButtonClass',function(e){
  console.log($(this).closest(".search-id").length); // returning 0
  console.log($(this).next(".search-id").val()); // returning undefined
  if($(this).next(".search-id").length){
    var myval = $(this).next(".search-id").find('input[type=hidden]').val();
    console.log('Val -'+myval);
  }
});

我做错了什么？

Answer 1

您可以使用nextUntil 和next 来获取所需的输入值，如下代码所示

$(function(){
  $(document).on('click','.myButtonClass',function(e){
    var input = $(this).nextUntil(".search-id").next();
    console.log(input.length);
    console.log("value = " + $(input).val());
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<span id="clear_promotion_brand_search" class="myButtonClass">Button<i class="fa fa-times"></i></span>
<span id="error_brand" class="show-error-msg">Error</span>
<input type="hidden" name="promotion_brand_id" value="Test Value" data-id="brand" class="search-id is-validate form-fields-value">

或者您可以将nextAll 与:first 选择器一起使用

 $(function(){
      $(document).on('click','.myButtonClass',function(e){
        var input = $(this).nextAll(".search-id:first");
        console.log(input.length);
        console.log("value = " + $(input).val());
      });
    });

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <span id="clear_promotion_brand_search" class="myButtonClass">Button<i class="fa fa-times"></i></span>
    <span id="error_brand" class="show-error-msg">Error</span>
    <input type="hidden" name="promotion_brand_id" value="Test Value" data-id="brand" class="search-id is-validate form-fields-value">

Answer 2

您的 .next() 元素实际上是 HTML 代码中的下一个元素，因此在您的情况下它是 <span id="error_brand" class="show-error-msg"></span>

我修改了你的代码。 .find() 也排除了当前元素。因此，如果您在要查找的元素上运行它，它将找不到它。

我稍微更新了你的 sn-p，只是添加了一个真正的按钮和一些内容。除此之外都是一样的。

$(document).on('click','.myButtonClass',function(e){
  e.preventDefault();
  if($(this).next().next().length){
    var myval = $(this).next().next().val();
    console.log('Val -'+myval);
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button type="button" id="clear_promotion_brand_search" class="myButtonClass">Click me!<i class="fa fa-times"></i></button>
<span id="error_brand" class="show-error-msg"></span>
<input type="hidden" name="promotion_brand_id" value="testvalue" data-id="brand" class="search-id is-validate form-fields-value">

Answer 3

使用siblings() 代替next()。

在工作代码下运行-

$(document).on('click','.myButtonClass',function(e){
  console.log($(this).closest(".search-id").length); // returning 0
  console.log($(this).siblings("input:hidden.search-id").val()); // returning undefined
  if($(this).siblings("input:hidden.search-id").length){
    var myval = $(this).siblings("input:hidden.search-id").val();
    console.log('Val -'+myval);
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<span id="clear_promotion_brand_search" class="myButtonClass">Click Here<i class="fa fa-times"></i></span>
<span id="error_brand" class="show-error-msg"></span>
<input type="hidden" name="promotion_brand_id" value="Hidden Input Value" data-id="brand" class="search-id is-validate form-fields-value">

Answer 4

你可以使用$(this).next().next()函数来查找输入框。

$(document).ready(function(){
   $(".myButtonClass").on('click',function(){
      $(this).next().next().val('Hello World')
   })
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<span id="clear_promotion_brand_search" class="myButtonClass"><i class="fa fa-times">click me</i></span>
<span id="error_brand" class="show-error-msg"></span>
<input type="hidden" name="promotion_brand_id" value="" data-id="brand" class="search-id is-validate form-fields-value">