我可以在html选项中使用双行文本吗？怎么样？
不，浏览器不提供此格式化选项。
您可以使用<label>s的一些复选框伪装它，并将JS变成一个飞出菜单。
我知道这是一篇较老的帖子，但是我将其留给未来的其他任何人。
您不能将换行符格式化为选项;但是，您可以使用标题attibute来提供鼠标悬停工具提示以提供完整信息。在选项文本中使用短描述符，并在标题中给出完整的细节。
<option value="1" title="This is my lengthy explanation of what this selection really means, so since you only see 1 on the drop down list you really know that you're opting to elect me as King of Willywarts! Always be sure to read the fine print!">1</option>
如何将长文本放在另一个<option>正下方并禁用它？可能是某人的解决方法，所以发布在这里。
<select>
<option>My real option text</option>
<option disabled style="font-style:italic"> (...and my really really long option text that is basically a continuation of previous option)</option>
<option disabled style="font-style:italic"> (...and still continuing my previous option)</option>
<option>Another real option text</option>
</select>有点破解，但这会产生多行选择的效果，为你的多行输入灰色bgcolor，如果选择任何灰色文本，它会选择第一个分组。有点聪明我会说:)第一个选项还显示了如何为标题添加标题。
function SelectFirst(SelVal) {
var arrSelVal = SelVal.split(",")
if (arrSelVal.length > 1) {
Valuetoselect = arrSelVal[0];
document.getElementById("select1").value = Valuetoselect;
}
}<select name="select1" id="select1" onchange="SelectFirst(this.value)">
<option value="1" title="this is my long title for the yes option">Yes</option>
<option value="2">No</option>
<option value="2,1" style="background:#eeeeee"> This is my description for the no option</option>
<option value="2,2" style="background:#eeeeee"> This is line 2 for the no option</option>
<option value="3">Maybe</option>
<option value="3,1" style="background:#eeeeee"> This is my description for Maybe option</option>
<option value="3,2" style="background:#eeeeee"> This is line 2 for the Maybe option</option>
<option value="3,3" style="background:#eeeeee"> This is line 3 for the Maybe option</option>
</select>HTML代码
<section style="background-color:rgb(237.247.249);">
<h2>Test of select menu (SelectboxIt plugin)</h2>
<select name="select_this" id="testselectset">
<option value="01">Option 1</option>
<option value="02">Option 2</option>
<option value="03">Option 3</option>
<option value="04">Option 4</option>
<option value="05">Option 5</option>
<option value="06">Option 6</option>
<option value="07">Option 7 with a really, really long text line that we shall use in order to test the wrapping of text within an option or optgroup</option>
<option value="08">Option 8</option>
<option value="09">Option 9</option>
<option value="10">Option 10</option>
</select>
</section>
Javascript代码
$(function(){
$("#testselectset").selectBoxIt({
theme: "default",
defaultText: "Make a selection...",
autoWidth: false
});
});
CSS代码
.selectboxit-container .selectboxit, .selectboxit-container .selectboxit-options {
width: 400px; /* Width of the dropdown button */
border-radius:0;
max-height:100px;
}
.selectboxit-options .selectboxit-option .selectboxit-option-anchor {
white-space: normal;
min-height: 30px;
height: auto;
}
你必须添加一些Jquery库select Box Jquery CSS
请检查此链接JsFiddle Link
在所有浏览器上都不能完全运行（hr行部分），但这是解决方案：
<select name="selector">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
<option disabled><hr></option>
<option value="4">Option 4</option>
<option value="5">Option 5</option>
<option value="6">Option 6</option>
</select>相反，也许尝试用标记替换选择，例如
// Wrap any selects that should be replaced
$('select.replace').wrap('<div class="select-replacement-wrapper"></div>');
// Replace placeholder text with select's initial value
$('.select-replacement-wrapper').each(function() {
$(this).prepend('<a>' + $('select option:selected', this).text() + '</a>');
});
// Update placeholder text with updated select value
$('select.replace').change(function(event) {
$(this).siblings('a').text( $('option:selected', this).text() );
});/* Position relative, so that we can overlay the hidden select */
.select-replacement-wrapper {
position: relative;
border: 3px solid red; /* to show area */
width: 33%;
margin: 0 auto;
}
/* Only shows if JS is enabled */
.select-replacement-wrapper a {
/* display: none; */
/* Notice that we've centered this text -
you can do whatever you want, mulitple lines wrap, etc,
since this is not a select element' */
text-align: center;
display: block;
border: 1px solid blue;
}
select.replace {
position: absolute;
width: 100%;
height: 100%;
top: 0;
border: 1px solid green;
opacity: 0;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select id="dropdown" class="replace">
<option value="First">First</option>
<option value="Second" selected>Second, and this is a long line, just to show wrapping</option>
<option value="Third">Third</option>
</select>是的，通过使用css样式white-space：pre-wrap;在引导程序的.dropdown类中通过覆盖它。早先是白色空间：nowrap;所以它使下拉包裹成一行。预包装使其成为根据宽度。
如果您只想在下拉列表中使用换行符，请使用以下命令：
<option label="" value="" disabled=""> </option>