如果我选中一个复选框,则下拉列表应仅显示在该列表旁边,而是显示在其下的所有其他列表中.
这是我用html代码的css
.sub-nav { display: none; }
input[type=checkbox]:checked + label ~ .sub-nav { display: inline; }<html>
<body>
<input type="checkbox" name="lingue" value="ing" id="ing"><label for="ing">Inglese</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
<br>
<input type="checkbox" name="lingue" value="ted" id="ted"><label for="ted">Tedesco</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
<br>
<input type="checkbox" name="lingue" value="fra" id="fra"><label for="fra">Francese</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
<br>
<input type="checkbox" name="lingue" value="spa" id="spa"><label for="spa">Spagnolo</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
</body>
</html>你应该使用直接相邻的兄弟选择器(+)而不是一般的兄弟选择器(~)
.sub-nav { display: none; }
input[type=checkbox]:checked + label + .sub-nav { display: inline; }<html>
<body>
<input type="checkbox" name="lingue" value="ing" id="ing"><label for="ing">Inglese</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
<br>
<input type="checkbox" name="lingue" value="ted" id="ted"><label for="ted">Tedesco</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
<br>
<input type="checkbox" name="lingue" value="fra" id="fra"><label for="fra">Francese</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
<br>
<input type="checkbox" name="lingue" value="spa" id="spa"><label for="spa">Spagnolo</label> 
<select class="sub-nav">
<option value="ott">Ottimo</option>
<option value="buo">Buono</option>
<option value="suff">Sufficente</option>
<option value="scol">Scolastico</option>
<option value="pess">Pessimo</option>
</select>
</body>
</html>