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如何设置 html“选择”元素的选项样式?

[英]How to style the option of an html "select" element?

这是我的 HTML:

<select id="ddlProducts" name="ddProducts"> 
    <option>Product1 : Electronics </option>
    <option>Product2 : Sports </option>
</select>

我想将产品名称(即“Product1”、“Product2”等)设为粗体,并将其类别(即电子、体育等)设为斜体,仅使用 CSS。 我发现一个老问题提到使用 HTML 和 CSS 是不可能的,但希望现在有解决方案。

只有少数样式属性可以应用于<option>元素。

这是因为这种类型的元素是“替换元素”的一个示例。 它们依赖于操作系统,不是 HTML/浏览器的一部分。 它不能通过 CSS 设置样式。

有一些替换插件/库看起来像<select>但实际上由可以设置样式的常规 HTML 元素组成。

不,这是不可能的,因为这些元素的样式是由用户的操作系统处理的。 MSDN 将在这里回答您的问题

除了background-colorcolor ,通过选项元素的样式对象应用的样式设置被忽略。

您可以在某种程度上设置选项元素的样式。

使用* CSS 选择器,您可以为系统绘制的框内的选项设置样式。

例子:

#ddlProducts *
{
 border-radius: 15px;
 background-color: red;
}

看起来像这样:

在此处输入图像描述

我发现并使用了这个很好的例子来设置选择和选项的样式。你可以随心所欲地使用这个选择。这里是小提琴

 // Iterate over each select element $('select').each(function() { // Cache the number of options var $this = $(this), numberOfOptions = $(this).children('option').length; // Hides the select element $this.addClass('s-hidden'); // Wrap the select element in a div $this.wrap('<div class="select"></div>'); // Insert a styled div to sit over the top of the hidden select element $this.after('<div class="styledSelect"></div>'); // Cache the styled div var $styledSelect = $this.next('div.styledSelect'); // Show the first select option in the styled div $styledSelect.text($this.children('option').eq(0).text()); // Insert an unordered list after the styled div and also cache the list var $list = $('<ul />', { 'class': 'options' }).insertAfter($styledSelect); // Insert a list item into the unordered list for each select option for (var i = 0; i < numberOfOptions; i++) { $('<li />', { text: $this.children('option').eq(i).text(), rel: $this.children('option').eq(i).val() }).appendTo($list); } // Cache the list items var $listItems = $list.children('li'); // Show the unordered list when the styled div is clicked (also hides it if the div is clicked again) $styledSelect.click(function(e) { e.stopPropagation(); $('div.styledSelect.active').each(function() { $(this).removeClass('active').next('ul.options').hide(); }); $(this).toggleClass('active').next('ul.options').toggle(); }); // Hides the unordered list when a list item is clicked and updates the styled div to show the selected list item // Updates the select element to have the value of the equivalent option $listItems.click(function(e) { e.stopPropagation(); $styledSelect.text($(this).text()).removeClass('active'); $this.val($(this).attr('rel')); $list.hide(); /* alert($this.val()); Uncomment this for demonstration! */ }); // Hides the unordered list when clicking outside of it $(document).click(function() { $styledSelect.removeClass('active'); $list.hide(); }); });
 body { padding: 50px; background-color: white; } .s-hidden { visibility: hidden; padding-right: 10px; } .select { cursor: pointer; display: inline-block; position: relative; font: normal 11px/22px Arial, Sans-Serif; color: black; border: 1px solid #ccc; } .styledSelect { position: absolute; top: 0; right: 0; bottom: 0; left: 0; background-color: white; padding: 0 10px; font-weight: bold; } .styledSelect:after { content: ""; width: 0; height: 0; border: 5px solid transparent; border-color: black transparent transparent transparent; position: absolute; top: 9px; right: 6px; } .styledSelect:active, .styledSelect.active { background-color: #eee; } .options { display: none; position: absolute; top: 100%; right: 0; left: 0; z-index: 999; margin: 0 0; padding: 0 0; list-style: none; border: 1px solid #ccc; background-color: white; -webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2); -moz-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2); } .options li { padding: 0 6px; margin: 0 0; padding: 0 10px; } .options li:hover { background-color: #39f; color: white; }
 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <select id="selectbox1"> <option value="">Select an option&hellip;</option> <option value="aye">Aye</option> <option value="eh">Eh</option> <option value="ooh">Ooh</option> <option value="whoop">Whoop</option> </select> <select id="selectbox2"> <option value="">Month&hellip;</option> <option value="january">January</option> <option value="february">February</option> <option value="march">March</option> <option value="april">April</option> <option value="may">May</option> <option value="june">June</option> <option value="july">July</option> <option value="august">August</option> <option value="september">September</option> <option value="october">October</option> <option value="november">November</option> <option value="december">December</option> </select>

如果您使用的是 Bootstrap 和/或 jquery,这里有一些方法可以将<option><select>一起设置样式。 我知道这不是原始海报所要求的,但我认为我可以帮助其他偶然发现这个问题的人。

您仍然可以实现为每个<option>单独设置样式的目标,但可能还需要对<select>应用一些样式。 我最喜欢的是下面提到的“Bootstrap Select”库。


引导选择库 (jquery)

如果你已经在使用 bootstrap,你可以试试Bootstrap Select或者下面的库(因为它有一个 bootstrap 主题)。

请注意,您可以单独设置整个select元素或option元素的样式。

例子

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依赖项:需要jQuery v1.9.1+、 Bootstrap 、Bootstrap 的 dropdown.js 组件和 Bootstrap 的 CSS

兼容性:不确定,但 bootstrap 表示它“支持所有主要浏览器和平台的最新、稳定版本”

演示https ://developer.snapappointments.com/bootstrap-select/examples/

 .special { font-weight: bold !important; color: #fff !important; background: #bc0000 !important; text-transform: uppercase; }
 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <link href="https://stackpath.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" /> <link href="https://cdn.jsdelivr.net/npm/bootstrap-select@1.13.9/dist/css/bootstrap-select.min.css" rel="stylesheet" /> <script src="https://cdn.jsdelivr.net/npm/bootstrap-select@1.13.9/dist/js/bootstrap-select.min.js"></script> <select class="selectpicker"> <option>Mustard</option> <option class="special">Ketchup</option> <option style="background: #5cb85c; color: #fff;">Relish</option> </select>


选择2(JS库)

您可以使用一个名为Select2的库。

选择2

依赖项:库仅是 JS + CSS + HTML(不需要 JQuery)。

兼容性:IE 8+、Chrome 8+、Firefox 10+、Safari 3+、Opera 10.6+

演示https ://select2.org/getting-started/basic-usage

还有一个可用的引导主题

没有引导示例:

 $(function() { var $select = $('.select2'); $select.select2({ theme: 'paper' }); });
 <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.7/js/select2.min.js"></script> <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.7/css/select2.min.css" rel="stylesheet"/> <select class="select2 form-control" placeholder="Country"> <optgroup label="Alaskan/Hawaiian Time Zone"> <option value="AK">Alaska</option> <option value="HI">Hawaii</option> </optgroup> <optgroup label="Pacific Time Zone"> <option value="CA">California</option> <option value="NV">Nevada</option> <option value="OR">Oregon</option> <option value="WA">Washington</option> </optgroup> </select>

引导示例:

 $(function() { var $select = $('.select2'); $select.select2({ theme: 'paper' }); });
 <link href="https://cdnjs.cloudflare.com/ajax/libs/bootswatch/3.3.2/paper/bootstrap.css" rel="stylesheet"/> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.7/js/select2.min.js"></script> <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.7/css/select2.min.css" rel="stylesheet"/> <select class="select2 form-control" placeholder="Country"> <optgroup label="Alaskan/Hawaiian Time Zone"> <option value="AK">Alaska</option> <option value="HI">Hawaii</option> </optgroup> <optgroup label="Pacific Time Zone"> <option value="CA">California</option> <option value="NV">Nevada</option> <option value="OR">Oregon</option> <option value="WA">Washington</option> </optgroup> </select>


MDBootstrap ($ & Bootstrap & JQuery)

如果您有多余的钱,可以使用高级库MDBootstrap (这是一个完整的 UI Kit ,所以它不轻)

这允许您使用Material design为您的选择和选项元素设置样式。

在此处输入图像描述

有一个免费版本,但它不允许您使用漂亮的 Material 设计!

依赖项Bootstrap 4 、JQuery、

兼容性“支持所有主流浏览器和平台的最新、稳定版本。”

演示https ://mdbootstrap.com/docs/jquery/forms/select/#color

似乎我可以直接在 Chrome 或 Firefox 中为select设置 CSS。 下面提供的 CSS 和 HTML 代码:

 .boldoption { font-weight: bold; }
 <select> <option>Some normal-font option</option> <option>Another normal-font option</option> <option class="boldoption">Some bold option</option> </select>
Chrome 上的工作代码

Firefox 上的工作代码

Firefox 93 上的工作代码

如前所述,唯一的方法是使用替换<select>功能的插件。

jQuery 插件列表:http: //plugins.jquery.com/tag/select/

看一下使用Select2插件的示例:http: //jsfiddle.net/swsLokfj/23/

一些属性可以为<option>标签设置样式:

  • font-family
  • color
  • font-*
  • background-color

您还可以为单个<option>标签使用自定义字体,例如任何google 字体Material Icons或来自icomoon等的其他图标字体。 (这对于字体选择器等可能会派上用场)

考虑到这一点,您可以创建字体系列堆栈并在<option>标签中插入图标​​,例如。

    <select>
        <option style="font-family: 'Icons', 'Roboto', sans-serif;">a    ★★★</option>
        <option style="font-family: 'Icons', 'Roboto', sans-serif;">b    ★★★★</option>
    </select>

其中取自Icons ,其余取自Roboto

请注意,尽管自定义字体不适用于移动选择。

Bootstrap 允许您通过数据内容使用样式:

<select class="selectpicker">
  <option data-content="<span class='label label-success'>Relish</span>">Relish</option>
</select>

示例: https ://silviomoreto.github.io/bootstrap-select/examples/

实际上,您可以添加 :before 和 :after 并设置它们的样式。 至少它是一些东西

 option { font-size: 18px; background-color: #ffffff; } option:before { content: ">"; font-size: 20px; display: none; padding-right: 10px; padding-left: 5px; color: #fff; } option:hover:before { display: inline; }
 <select id="ddlProducts" name="ddProducts"> <option>Product1 : Electronics </option> <option>Product2 : Sports </option> </select>

即使没有太多要更改的属性,但您只能使用 css 实现以下样式:

在此处输入图像描述

 .options { border: 1px solid #e5e5e5; padding: 10px; } select { font-size: 14px; border: none; width: 100%; background: white; }
 <div class="options"> <select> <option value="">Apple</option> <option value="">Banana</option> <option value="">Orange</option> <option value="">Mango</option> </select> </div>

现在是 2017 年,可以针对特定的选择选项。 在我的项目中,我有一个带有class="variations"的表,选择选项位于表单元格td="value"中,并且选择的 ID 为select#pa_color option 元素也有一个类option="attached" (在其他类标签中)。 如果用户以批发客户身份登录,他们可以看到所有颜色选项。 但是零售客户不允许购买 2 个颜色选项,所以我禁用了它们

<option class="attached" disabled>color 1</option>
<option class="attached" disabled>color 2</option>

这需要一点逻辑,但这是我针对禁用选择选项的方式。

CSS

table.variations td.value select#pa_color option.attached:disabled {
display: none !important;
}

这样,我的颜色选项只对批发客户可见。

在这里留下一个快速的替代方案,使用表格上的类切换。 该行为与选择非常相似,但可以使用过渡、过滤器和颜色设置样式,每个子项都可以单独设置。

 function toggleSelect(){ if (store.classList[0] === "hidden"){ store.classList = "viewfull" } else { store.classList = "hidden" } }
 #store { overflow-y: scroll; max-height: 110px; max-width: 50% } .hidden { display: none } .viewfull { display: block } #store :nth-child(4) { background-color: lime; } span {font-size:2rem;cursor:pointer}
 <span onclick="toggleSelect()">⮋</span> <div id="store" class="hidden"> <ul><li><a href="#keylogger">keylogger</a></li><li><a href="#1526269343113">1526269343113</a></li><li><a href="#slow">slow</a></li><li><a href="#slow2">slow2</a></li><li><a href="#Benchmark">Benchmark</a></li><li><a href="#modal">modal</a></li><li><a href="#buma">buma</a></li><li><a href="#1526099371108">1526099371108</a></li><a href="#1526099371108o">1526099371108o</a></li><li><a href="#pwnClrB">pwnClrB</a></li><li><a href="#stars%20u">stars%20u</a></li><li><a href="#pwnClrC">pwnClrC</a></li><li><a href="#stars ">stars </a></li><li><a href="#wello">wello</a></li><li><a href="#equalizer">equalizer</a></li><li><a href="#pwnClrA">pwnClrA</a></li></ul> </div>

您可以使用内联样式将自定义样式添加到<option>标记。

例如: <option style="font-weight:bold;color:#09C;">Option 1</option>这将仅将样式应用于此特定的<option>元素。

然后,您可以使用一些 javascript 魔术将内联样式应用于<select>标记中的所有<option>元素,如下所示:

var select = $(document).getElementById('#select-element-id')

var option = select.children('#option-element-id')

option.css('font-weight', 'bold')

option.css('font-size', '24px')

您还可以使用<option value="" disabled> <br> </option>在选项之间添加换行符。

它肯定会奏效。 选择选项由操作系统而不是 html 呈现。 这就是 CSS 样式不起作用的原因,.. 通常option{font-size : value ; background-color:colorCode; border-radius:value; } option{font-size : value ; background-color:colorCode; border-radius:value; }
这会起作用,但我们不能自定义填充、边距等。

下面的代码 100% 用于自定义从这个示例中获取的选择标签

 var x, i, j, selElmnt, a, b, c; /*look for any elements with the class "custom-select":*/ x = document.getElementsByClassName("custom-select"); for (i = 0; i < x.length; i++) { selElmnt = x[i].getElementsByTagName("select")[0]; /*for each element, create a new DIV that will act as the selected item:*/ a = document.createElement("DIV"); a.setAttribute("class", "select-selected"); a.innerHTML = selElmnt.options[selElmnt.selectedIndex].innerHTML; x[i].appendChild(a); /*for each element, create a new DIV that will contain the option list:*/ b = document.createElement("DIV"); b.setAttribute("class", "select-items select-hide"); for (j = 1; j < selElmnt.length; j++) { /*for each option in the original select element, create a new DIV that will act as an option item:*/ c = document.createElement("DIV"); c.innerHTML = selElmnt.options[j].innerHTML; c.addEventListener("click", function(e) { /*when an item is clicked, update the original select box, and the selected item:*/ var y, i, k, s, h; s = this.parentNode.parentNode.getElementsByTagName("select")[0]; h = this.parentNode.previousSibling; for (i = 0; i < s.length; i++) { if (s.options[i].innerHTML == this.innerHTML) { s.selectedIndex = i; h.innerHTML = this.innerHTML; y = this.parentNode.getElementsByClassName("same-as-selected"); for (k = 0; k < y.length; k++) { y[k].removeAttribute("class"); } this.setAttribute("class", "same-as-selected"); break; } } h.click(); }); b.appendChild(c); } x[i].appendChild(b); a.addEventListener("click", function(e) { /*when the select box is clicked, close any other select boxes, and open/close the current select box:*/ e.stopPropagation(); closeAllSelect(this); this.nextSibling.classList.toggle("select-hide"); this.classList.toggle("select-arrow-active"); }); } function closeAllSelect(elmnt) { /*a function that will close all select boxes in the document, except the current select box:*/ var x, y, i, arrNo = []; x = document.getElementsByClassName("select-items"); y = document.getElementsByClassName("select-selected"); for (i = 0; i < y.length; i++) { if (elmnt == y[i]) { arrNo.push(i) } else { y[i].classList.remove("select-arrow-active"); } } for (i = 0; i < x.length; i++) { if (arrNo.indexOf(i)) { x[i].classList.add("select-hide"); } } } /*if the user clicks anywhere outside the select box, then close all select boxes:*/ document.addEventListener("click", closeAllSelect);
 /*the container must be positioned relative:*/ .custom-select { position: relative; font-family: Arial; } .custom-select select { display: none; /*hide original SELECT element:*/ } .select-selected { background-color: DodgerBlue; } /*style the arrow inside the select element:*/ .select-selected:after { position: absolute; content: ""; top: 14px; right: 10px; width: 0; height: 0; border: 6px solid transparent; border-color: #fff transparent transparent transparent; } /*point the arrow upwards when the select box is open (active):*/ .select-selected.select-arrow-active:after { border-color: transparent transparent #fff transparent; top: 7px; } /*style the items (options), including the selected item:*/ .select-items div,.select-selected { color: #ffffff; padding: 8px 16px; border: 1px solid transparent; border-color: transparent transparent rgba(0, 0, 0, 0.1) transparent; cursor: pointer; } /*style items (options):*/ .select-items { position: absolute; background-color: DodgerBlue; top: 100%; left: 0; right: 0; z-index: 99; } /*hide the items when the select box is closed:*/ .select-hide { display: none; } .select-items div:hover, .same-as-selected { background-color: rgba(0, 0, 0, 0.1); }
 <div class="custom-select" style="width:200px;"> <select> <option value="0">Select car:</option> <option value="1">Audi</option> <option value="2">BMW</option> <option value="3">Citroen</option> <option value="4">Ford</option> <option value="5">Honda</option> <option value="6">Jaguar</option> <option value="7">Land Rover</option> <option value="8">Mercedes</option> <option value="9">Mini</option> <option value="10">Nissan</option> <option value="11">Toyota</option> <option value="12">Volvo</option> </select> </div>

这是你要找的吗? 我用 jQuery 做到了!

运行代码片段

 $(".custom-select").each(function() { var classes = $(this).attr("class"), id = $(this).attr("id"), name = $(this).attr("name"); var template = '<div class="' + classes + '">'; template += '<span class="custom-select-trigger">' + $(this).attr("placeholder") + '</span>'; template += '<div class="custom-options">'; $(this).find("option").each(function() { template += '<span class="custom-option ' + $(this).attr("class") + '" data-value="' + $(this).attr("value") + '">' + $(this).html() + '</span>'; }); template += '</div></div>'; $(this).wrap('<div class="custom-select-wrapper"></div>'); $(this).hide(); $(this).after(template); }); $(".custom-option:first-of-type").hover(function() { $(this).parents(".custom-options").addClass("option-hover"); }, function() { $(this).parents(".custom-options").removeClass("option-hover"); }); $(".custom-select-trigger").on("click", function() { $('html').one('click',function() { $(".custom-select").removeClass("opened"); }); $(this).parents(".custom-select").toggleClass("opened"); event.stopPropagation(); }); $(".custom-option").on("click", function() { $(this).parents(".custom-select-wrapper").find("select").val($(this).data("value")); $(this).parents(".custom-options").find(".custom-option").removeClass("selection"); $(this).addClass("selection"); $(this).parents(".custom-select").removeClass("opened"); $(this).parents(".custom-select").find(".custom-select-trigger").text($(this).text()); });
 body { font-family: 'Roboto', sans-serif; } .custom-select-wrapper { position: relative; display: inline-block; user-select: none; } .custom-select-wrapper select { display: none; } .custom-select { position: relative; display: inline-block; } .custom-select-trigger { position: relative; display: block; width: 170px; padding: 0 84px 0 22px; font-size: 19px; font-weight: 300; color: #5f5f5f; line-height: 50px; background: #EAEAEA; border-radius: 4px; cursor: pointer; margin-left:20px; border: 1px solid #5f5f5f; transition: all 0.3s; } .custom-select-trigger:hover { background-color: #d9d9d9; transition: all 0.3s; } .custom-select-trigger:after { position: absolute; display: block; content: ''; width: 10px; height: 10px; top: 50%; right: 25px; margin-top: -3px; border-bottom: 1px solid #5f5f5f; border-right: 1px solid #5f5f5f; transform: rotate(45deg) translateY(-50%); transition: all 0.4s ease-in-out; transform-origin: 50% 0; } .custom-select.opened .custom-select-trigger:after { margin-top: 3px; transform: rotate(-135deg) translateY(-50%); } .custom-options { position: absolute; display: block; top: 100%; left: 0; right: 0; margin: 15px 0; border: 1px solid #b5b5b5; border-radius: 4px; box-sizing: border-box; box-shadow: 0 2px 1px rgba(0,0,0,.07); background: #fff; transition: all 0.4s ease-in-out; margin-left: 20px; opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(-15px); } .custom-select.opened .custom-options { opacity: 1; visibility: visible; pointer-events: all; transform: translateY(0); } .custom-options:before { position: absolute; display: block; content: ''; bottom: 100%; right: 25px; width: 7px; height: 7px; margin-bottom: -4px; border-top: 1px solid #b5b5b5; border-left: 1px solid #b5b5b5; background: #fff; transform: rotate(45deg); transition: all 0.4s ease-in-out; } .option-hover:before { background: #f9f9f9; } .custom-option { position: relative; display: block; padding: 0 22px; border-bottom: 1px solid #b5b5b5; font-size: 18px; font-weight: 600; color: #b5b5b5; line-height: 47px; cursor: pointer; transition: all 0.15s ease-in-out; } .custom-option:first-of-type { border-radius: 4px 4px 0 0; } .custom-option:last-of-type { border-bottom: 0; border-radius: 0 0 4px 4px; } .custom-option:hover, .custom-option.selection { background: #f2f0f0; }
 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <select name="sources" id="sources" class="custom-select sources" placeholder="My Categories"> <option value="categoryOne">Category 1</option> <option value="categoryTwo">Category 2</option> <option value="categoryThree">Category 3</option> <option value="categoryFour">Category 4</option> </select>

此元素由操作系统呈现,而不是 HTML。 它不能通过 CSS 设置样式。

 $(function() { var clicky; var t=0; $(document).mousedown(function(e) { clicky = $(e.target); }); $(document).mouseup(function(e) { clicky = null; }); $("select").focusout(function(e) { if (typeof clicky.attr('id') !== typeof undefined && clicky.attr('id') !== false) { $(this).parents().children("span.selected").html(clicky.html()); $(this).children('option[value="'+clicky.attr('id')+'"]').prop('selected', true); } $(this).parents().children("span.lists").html(''); }); $('select > option').text(function(i, text) { var attr = $(this).attr('selected'); if (typeof attr !== typeof undefined && attr !== false) { $(this).parents().parents().children("span.selected").html(text); } }); $("select").focusin(function(){ $(this).children('option').text(function(i, text) { $(this).parents().children("span.lists").append("<span class='item' id='"+$(this).attr('value')+"'>"+text+"</span>"); }); }); });
 select { width: 0px; height: 0px; overflow:hidden; outline: none; border: none; appearance:none; -moz-appearance: none; } label{ display: inline-block; padding: 5px 10px; position: relative; width: 100px; height: 20px; background-color:#ccc; } label .selected{ display: inline-block; overflow: hidden; width: 100%; height: 100%; } label span.lists{ width: 100%; display: inline-block; position: absolute; top: 100%; left: 0px; box-shadow: 0px 0px 2px 0px #ccc; background-color:#fff; z-index: 9; } label span.item{ display: inline-block; width: 100%; border-bottom: 1px solid #ccc; }
 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> </head> <body> <form action="?" method="GET"> <label><span class="selected">select..</span> <span class="lists"></span> <select name="test"> <option value="1">Lorem ipsum dolor sit amet, consectetur adipisicing elit.</option> <option value="2" selected>item 2</option> <option value="3">item 3</option> <option value="4">item 4</option> </select> </label><br> <label><span class="selected">select..</span> <span class="lists"></span> <select name="test2"> <option value="1">Lorem ipsum dolor sit amet, consectetur adipisicing elit.</option> <option value="2">item 2</option> <option value="3" selected>item 3</option> <option value="4">item 4</option> </select> </label><br> <button>Submit</button> </form> </body> </html>

试试这个可能对你有帮助

[ https://codepen.io/venu9l/pen/jeNXzY][1]

您可以添加一个类并给出 font-weight:700; 在选项中。 但是通过使用这个,所有的文本都会变成粗体。

下面代码的输出

这是一个用于样式选项和选择标签的 html css 代码。 选择的选项:背景和粗体 关闭后,它以斜体显示。

    <style>
        .mydropdown{
         border:none;
         border-bottom:2px dotted black;
         display:inline;max-width:20%;
         font-style: italic;
         font-weight: 600;
         cursor: pointer;  
    }
    .mydropdown:hover , .myoption:active , .myoption:checked{
         border:2px dotted green;
    }
    .myoption{
         font-style: normal;
    }
    .mydropdown .myoption:checked,
    .mydropdown .myoption:hover ,
    .mydropdown .myoption:active {
        font-style: italic;
        font-weight: 600;
     }
    </style>

 .options { border: 1px solid #e5e5e5; padding: 10px; } select { font-size: 14px; border: none; width: 100%; background: white; }
 <div class="options"> <select> <option value="">Apple</option> <option value="">Banana</option> <option value="">Orange</option> <option value="">Mango</option> </select> </div>

 var x, i, j, selElmnt, a, b, c; /*look for any elements with the class "custom-select":*/ x = document.getElementsByClassName("custom-select"); for (i = 0; i < x.length; i++) { selElmnt = x[i].getElementsByTagName("select")[0]; /*for each element, create a new DIV that will act as the selected item:*/ a = document.createElement("DIV"); a.setAttribute("class", "select-selected"); a.innerHTML = selElmnt.options[selElmnt.selectedIndex].innerHTML; x[i].appendChild(a); /*for each element, create a new DIV that will contain the option list:*/ b = document.createElement("DIV"); b.setAttribute("class", "select-items select-hide"); for (j = 1; j < selElmnt.length; j++) { /*for each option in the original select element, create a new DIV that will act as an option item:*/ c = document.createElement("DIV"); c.innerHTML = selElmnt.options[j].innerHTML; c.addEventListener("click", function(e) { /*when an item is clicked, update the original select box, and the selected item:*/ var y, i, k, s, h; s = this.parentNode.parentNode.getElementsByTagName("select")[0]; h = this.parentNode.previousSibling; for (i = 0; i < s.length; i++) { if (s.options[i].innerHTML == this.innerHTML) { s.selectedIndex = i; h.innerHTML = this.innerHTML; y = this.parentNode.getElementsByClassName("same-as-selected"); for (k = 0; k < y.length; k++) { y[k].removeAttribute("class"); } this.setAttribute("class", "same-as-selected"); break; } } h.click(); }); b.appendChild(c); } x[i].appendChild(b); a.addEventListener("click", function(e) { /*when the select box is clicked, close any other select boxes, and open/close the current select box:*/ e.stopPropagation(); closeAllSelect(this); this.nextSibling.classList.toggle("select-hide"); this.classList.toggle("select-arrow-active"); }); } function closeAllSelect(elmnt) { /*a function that will close all select boxes in the document, except the current select box:*/ var x, y, i, arrNo = []; x = document.getElementsByClassName("select-items"); y = document.getElementsByClassName("select-selected"); for (i = 0; i < y.length; i++) { if (elmnt == y[i]) { arrNo.push(i) } else { y[i].classList.remove("select-arrow-active"); } } for (i = 0; i < x.length; i++) { if (arrNo.indexOf(i)) { x[i].classList.add("select-hide"); } } } /*if the user clicks anywhere outside the select box, then close all select boxes:*/ document.addEventListener("click", closeAllSelect);
 /*the container must be positioned relative:*/ .custom-select { position: relative; font-family: Arial; } .custom-select select { display: none; /*hide original SELECT element:*/ } .select-selected { background-color: DodgerBlue; } /*style the arrow inside the select element:*/ .select-selected:after { position: absolute; content: ""; top: 14px; right: 10px; width: 0; height: 0; border: 6px solid transparent; border-color: #fff transparent transparent transparent; } /*point the arrow upwards when the select box is open (active):*/ .select-selected.select-arrow-active:after { border-color: transparent transparent #fff transparent; top: 7px; } /*style the items (options), including the selected item:*/ .select-items div,.select-selected { color: #ffffff; padding: 8px 16px; border: 1px solid transparent; border-color: transparent transparent rgba(0, 0, 0, 0.1) transparent; cursor: pointer; } /*style items (options):*/ .select-items { position: absolute; background-color: DodgerBlue; top: 100%; left: 0; right: 0; z-index: 99; } /*hide the items when the select box is closed:*/ .select-hide { display: none; } .select-items div:hover, .same-as-selected { background-color: rgba(0, 0, 0, 0.1); }
 <div class="custom-select" style="width:200px;"> <select> <option value="0">Select car:</option> <option value="1">Audi</option> <option value="2">BMW</option> <option value="3">Citroen</option> <option value="4">Ford</option> <option value="5">Honda</option> <option value="6">Jaguar</option> <option value="7">Land Rover</option> <option value="8">Mercedes</option> <option value="9">Mini</option> <option value="10">Nissan</option> <option value="11">Toyota</option> <option value="12">Volvo</option> </select> </div>

 (() => { const optionValues = document.querySelectorAll(".search-form__value"); const searchOptions = document.querySelector(".search-form__selector"); const dropdown = document.querySelector(".search-form__dropdown"); const input = document.getElementById("search-form-loc"); const selectorText = document.querySelector(".search-form__label--loc"); searchOptions.addEventListener("click", function () { dropdownHandler(); }); optionValues.forEach((option) => { option.addEventListener("click", function () { updateUI(input, selectorText, this); }); }); window.addEventListener("mouseup", function (event) { if (event.target != dropdown) { dropdown.classList.remove("search-form__dropdown--show"); } }); function dropdownHandler() { dropdown.classList.toggle("search-form__dropdown--show"); } function updateUI(input, selectorText, referedThis) { input.value = referedThis.textContent.trim(); selectorText.textContent = referedThis.textContent.trim(); dropdown.classList.remove("search-form__dropdown--show"); } })();
 /* CSS Reset Starts */ *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; } body { font-family: sans-serif; color: #777; background-color: slateblue !important; } /* CSS Reset Ends */ .search-form { display: flex; align-items: center; width: max-content; max-width: 700px; margin: 100px auto; background: #fff; } .search-form__label { margin-right: 40px; } .search-form__selector { display: flex; align-items: center; gap: 12px; cursor: pointer; font-size: 14px; padding: 12px 18px; background: #fff; position: relative; z-index: 1000; } .search-form__line { height: 100%; width: 1px; background: #777; margin-left: auto; } .search-form__icon { font-size: 24px; } /* Dropdown */ .search-form__dropdown { list-style: none; position: absolute; left: 0; top: 100%; box-shadow: 0 7px 30px -10px #96aa6480; width: 100%; min-width: max-content; transition: 0.4s; background-color: #fff; opacity: 0; visibility: hidden; z-index: 10; pointer-events: none; transform: translateY(20px); cursor: pointer; } .search-form__value { padding: 7px; } .search-form__value:hover { background: #0667d5; color: #fff; } .pos-rel { position: relative; } .search-form__dropdown--show { opacity: 1; visibility: visible; pointer-events: visible; -webkit-transform: translate(0); -ms-transform: translate(0); transform: translate(0); }
 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" /> </head> <body> <form class="search-form"> <input type="hidden" name="search-form-loc" id="search-form-loc" /> <div class="pos-rel"> <div class="search-form__selector"> <p class="search-form__label search-form__label--loc">Select From List</p> <div class="search-form__line">&nbsp;</div> <i class="fa fa-caret-down search-form__icon"></i> </div> <ul class="search-form__dropdown"> <li class="search-form__value" data-loc="search-form-loc">UK</li> <li class="search-form__value" data-loc="search-form-loc">Barcelona</li> <li class="search-form__value" data-loc="search-form-loc">Brazil</li> <li class="search-form__value" data-loc="search-form-loc">Hungary</li> </ul> </div> </form> </body> </html>

在此处输入图像描述

如果你不想涉及 JavaScript 试试这个:

select {
  margin-top: 2% !important;
  font-size: 19px !important;
  text-align: center !important;
  width: 25% !important;
  padding: 6px 12px !important;
}
option {
  min-height: 1.5rem !important;
  padding: 14px !important;
}

如上所述,这并不是真的可能; 但是,如果您只想在用户与字段进行交互之前为“选择产品...”选项设置样式的初始状态,则可以执行以下操作-

下面的示例将第一个选项设置为红色(实际上是全部样式),一旦用户交互,它将删除该选项(已设置value =“ defaultValue”)并删除应用于选择的类。 除了颜色以外,您还可以应用其他选项,但是它们只会影响更改后的字段,而不会影响列表视图。

的CSS

.default-value{
  color: red;
}

jQuery的

$("select").addClass('default-value');

$("select").bind("focus", function () {
  $(this).children('option[value="defaultValue"]').remove();
  $(this).removeClass('default-value');
});

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