选择其所属的元素

Question

在".bar "中有单选按钮，我在 "div class='selected-item'"中显示所选的输入单选值，名称值必须全部相同，每个.bar中的选择，应该写在".selected-item "本身，当我在第一个".bar "中选择时，第二个".bar "的值也会改变，我如何解决这个问题？

$('.bar input[name="exa"]').on('change', function() {
	var selectedprice = $('.bar input[name=exa]:checked').val();
	$( ".selected-item b" ).text( selectedprice );
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="bar">
	<h2>This is first bar. class name "bar"</h2>
	<div class="selected-item">Selected İtem: <b>130</b></div>
	<label>
		<input type="radio" name="exa" value="130" />
		130
	</label>
	<label>
		<input type="radio" name="exa" value="140" />
		140
	</label>
	<label>
		<input type="radio" name="exa" value="150" />
		150
	</label>
	<label>
		<input type="radio" name="exa" value="160" />
		160
	</label>
</div>

<div class="bar">
	<h2>This is second bar. Class name "bar" again.</h2>
	<div class="selected-item">Selected İtem: <b>130</b></div>
	<label>
		<input type="radio" name="exa" value="150" />
		130
	</label>
	<label>
		<input type="radio" name="exa" value="140" />
		140
	</label>
	<label>
		<input type="radio" name="exa" value="150" />
		150
	</label>
	<label>
		<input type="radio" name="exa" value="160" />
		160
	</label>
</div>

Answer 1

你可以使用jquery的 closest 它将在DOM中向上寻找选择器。然后使用 FIND 向下搜索DOM中相应的字段。

$('.bar input[name="exa"]').on('change', function() {
	var selectedprice = $(this).closest(".bar").find('input[name=exa]:checked').val();
	$(this).closest(".bar").find( ".selected-item b" ).text( selectedprice );
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="bar">
	<h2>This is first bar. class name "bar"</h2>
	<div class="selected-item">Selected İtem: <b>130</b></div>
	<label>
		<input type="radio" name="exa" value="130" />
		130
	</label>
	<label>
		<input type="radio" name="exa" value="140" />
		140
	</label>
	<label>
		<input type="radio" name="exa" value="150" />
		150
	</label>
	<label>
		<input type="radio" name="exa" value="160" />
		160
	</label>
</div>

<div class="bar">
	<h2>This is second bar. Class name "bar" again.</h2>
	<div class="selected-item">Selected İtem: <b>130</b></div>
	<label>
		<input type="radio" name="exa" value="130" />
		130
	</label>
	<label>
		<input type="radio" name="exa" value="140" />
		140
	</label>
	<label>
		<input type="radio" name="exa" value="150" />
		150
	</label>
	<label>
		<input type="radio" name="exa" value="160" />
		160
	</label>
</div>