我正在为表单构建自定义下拉元素，现在正在更改在这里找到的代码：https://codepen.io/qwertie/pen/QBYMdZ
我希望li项水平占据它们所需的空间。
如果我将width的{{1}}手动设置为.cb-item，则可以正常工作，但是我希望它可以自动缩放。
我尝试在200px上设置display: inline-block和display: flex。我使用了.cb-item中的所有值，但无法使用下拉菜单中的项目来使用每个justify-content项目内容的宽度。
我该怎么办？
CSS
liHTML
/* ------------------------------------------ */
/* ----- combobox / dropdown list styling */
/* ------------------------------------------ */
.less-sticky {
border-radius: 10px;
background-color: red !important;
max-height: 200px;
margin-top: 7px;
background-color: rgb(255, 255, 255);
border-bottom-left-radius: 3px;
border-bottom-right-radius: 3px;
z-index: 10;
overflow-y: scroll !important;
overflow-x: hidden !important;
border-width: 0px 1px 1px;
border-style: solid solid solid;
border-color: rgb(220, 220, 220) rgb(220, 220, 220) rgb(220, 220, 220);
}
.dropdown {
/* "relative" and "inline-block" (or just "block") are needed
here so that "absolute" works correctly in children */
position: relative;
display: inline-block;
}
.dropdown > *:last-child {
/* Using `display:block` here has two desirable effects:
(1) Accessibility: it lets input widgets in the dropdown to
be selected with the tab key when the dropdown is closed.
(2) It lets the opacity transition work.
But it also makes the contents visible, which is undesirable
before the list drops down. To compensate, use `opacity: 0`
and disable mouse pointer events. Another side effect is that
the user can select and copy the contents of the hidden list,
but don't worry, the selected content is invisible. */
display: block;
opacity: 0;
pointer-events: none;
transition: 0.4s; /* fade out */
position: absolute;
left: 0;
top: 100%;
border: 1px solid #888;
background-color: #fff;
box-shadow: 1px 2px 4px 1px #666;
box-shadow: 1px 2px 4px 1px #4448;
z-index: 9999;
min-width: 100%;
box-sizing: border-box;
}
/* List of situations in which to show the dropdown list.
- Focus dropdown or non-last child of it => show last-child
- Focus .downarrow of combobox => show last-child
- Stay open for focus in last child, unless .less-sticky
- .sticky last child stays open on hover
- .less-sticky stays open on hover, ignores focus in last-child */
.dropdown:focus > *:last-child,
.dropdown > *:focus ~ *:last-child,
.dropdown > .less-sticky:last-child:hover {
display: block;
opacity: 1;
transition: 0.15s;
pointer-events: auto;
}
/* detect Edge/IE and behave if though less-sticky is on for all
dropdowns (otherwise links won't be clickable) */
@supports (-ms-ime-align:auto) {
.dropdown > *:last-child:hover {
display: block;
opacity: 1;
pointer-events: auto;
}
}
/* detect IE and do the same thing. */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
.dropdown > *:last-child:hover {
display: block;
opacity: 1;
pointer-events: auto;
}
}
.dropdown:not(.sticky) > *:not(:last-child):focus,
.dropdown:focus {
pointer-events: none; /* Causes second click to close */
}
.downarrow:focus {
outline: 2px solid #8BF; /* Edge/IE can't do outline transparency */
outline: 2px solid #48F8;
}
/* ------------------------------------------ */
/* ----- Styling for examples */
/* ------------------------------------------ */
.cb-item {
display: block;
margin: 0px;
padding: 2px;
color: #000;
}
.cb-item:hover, .cb-item:hover > a:visited {
color: #fff;
background-color: #88f;
}
答案 0 :(得分：2)
尝试添加此
ul{
width: max-content;
margin:0;
padding:0;
}
max-content给出孩子最大宽度的宽度
/* ------------------------------------------ */
/* ----- combobox / dropdown list styling */
/* ------------------------------------------ */
.less-sticky {
border-radius: 10px;
background-color: red !important;
max-height: 200px;
margin-top: 7px;
background-color: rgb(255, 255, 255);
border-bottom-left-radius: 3px;
border-bottom-right-radius: 3px;
z-index: 10;
overflow-y: scroll !important;
overflow-x: hidden !important;
border-width: 0px 1px 1px;
border-style: solid solid solid;
border-color: rgb(220, 220, 220) rgb(220, 220, 220) rgb(220, 220, 220);
}
.dropdown {
/* "relative" and "inline-block" (or just "block") are needed
here so that "absolute" works correctly in children */
position: relative;
display: inline-block;
}
.dropdown > *:last-child {
/* Using `display:block` here has two desirable effects:
(1) Accessibility: it lets input widgets in the dropdown to
be selected with the tab key when the dropdown is closed.
(2) It lets the opacity transition work.
But it also makes the contents visible, which is undesirable
before the list drops down. To compensate, use `opacity: 0`
and disable mouse pointer events. Another side effect is that
the user can select and copy the contents of the hidden list,
but don't worry, the selected content is invisible. */
display: block;
opacity: 0;
pointer-events: none;
transition: 0.4s; /* fade out */
position: absolute;
left: 0;
top: 100%;
border: 1px solid #888;
background-color: #fff;
box-shadow: 1px 2px 4px 1px #666;
box-shadow: 1px 2px 4px 1px #4448;
z-index: 9999;
min-width: 100%;
box-sizing: border-box;
}
/* List of situations in which to show the dropdown list.
- Focus dropdown or non-last child of it => show last-child
- Focus .downarrow of combobox => show last-child
- Stay open for focus in last child, unless .less-sticky
- .sticky last child stays open on hover
- .less-sticky stays open on hover, ignores focus in last-child */
.dropdown:focus > *:last-child,
.dropdown > *:focus ~ *:last-child,
.dropdown > .less-sticky:last-child:hover {
display: block;
opacity: 1;
transition: 0.15s;
pointer-events: auto;
}
/* detect Edge/IE and behave if though less-sticky is on for all
dropdowns (otherwise links won't be clickable) */
@supports (-ms-ime-align:auto) {
.dropdown > *:last-child:hover {
display: block;
opacity: 1;
pointer-events: auto;
}
}
/* detect IE and do the same thing. */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
.dropdown > *:last-child:hover {
display: block;
opacity: 1;
pointer-events: auto;
}
}
.dropdown:not(.sticky) > *:not(:last-child):focus,
.dropdown:focus {
pointer-events: none; /* Causes second click to close */
}
.downarrow:focus {
outline: 2px solid #8BF; /* Edge/IE can't do outline transparency */
outline: 2px solid #48F8;
}
/* ------------------------------------------ */
/* ----- Styling for examples */
/* ------------------------------------------ */
.cb-item {
display: block;
margin: 0px;
padding: 2px;
color: #000;
}
.cb-item:hover, .cb-item:hover > a:visited {
color: #fff;
background-color: #88f;
}
ul{
width: max-content;
margin:0;
padding:0;
}<div class="dropdown">
<span tabindex="0">dropdown menu V</span>
<div class="less-sticky">
<ul>
<li class="cb-item"><a href="http://yes.net">home page</a></li>
<li class="cb-item"><a href="http://test.net">My home page</a></li>
<li class="cb-item"><a href="#">Stay on this page</a></li>
<li class="cb-item"><a href="#">Stay on this page</a></li>
<li class="cb-item"><a href="#">Stay on this page</a></li>
<li class="cb-item"><a href="#">Stay on this page</a></li>
<li class="cb-item"><a href="#">Stay on this page</a></li>
<li class="cb-item"><a href="#">Stay on this page</a></li>
<li class="cb-item"><a href="#">fd gddsfgpage</a></li>
<li class="cb-item"><a href="#">457567456756 757this page</a></li>
<li class="cb-item"><a href="#">Stay on this page</a></li>
</ul>
</div>
</div>
答案 1 :(得分：0)
首先，您必须设置以下顺序： 删除左侧的填充空间：
.less-sticky ul {
padding-left:0;
}
然后
.cb-item {
min-width: 200px;
}
将最小宽度添加到指定项目的宽度，然后必须调整下拉包装器： 来自
.dropdown > *:last-child {
min-width: 100%;
}
到
.dropdown > *:last-child {
width: auto;
}
标准宽度是自动的，但是您必须按照跨浏览器支持的顺序进行设置。 主容器中始终应包含通用代码，因此请从主容器中删除最小宽度，然后将其添加到希望产生效果的项目中，然后将其添加至cb-item。 宽度与最小或最大宽度之间存在一些细微差异，因此它们可能会导致一些错误。 我在Codepen内尝试了您的代码，因此效果很好，请在需要时提出任何问题。 希望这有道理。
答案 2 :(得分：0)
尝试一下：https://jsfiddle.net/samjco/paxfv1jt/74/
CSS：
.dd-box{
border: 1px solid;
padding: 10px 0 10px 8px;
margin: 0 !important;
border-radius: 3px;
width: 182px !important;
display: block;
z-index: 10;
cursor: pointer;
}
.plus{
float: right;
margin-right: 14px;
vertical-align: middle;
}
.less-sticky {
border-radius: 0px 0px 3px 3px;
margin-top: -2px;
z-index: 0;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown > *:last-child {
display: block;
opacity: 0;
pointer-events: none;
transition: 0.4s;
position: absolute;
left: 0;
top: 100%;
border: 1px solid #888;
border-top: 0px;
background-color: #fff;
box-shadow: 2px 10px 10px -5px #4444444a;
min-width: 100%;
box-sizing: border-box;
}
.dropdown:focus > *:last-child,
.dropdown > *:focus ~ *:last-child,
.dropdown > .less-sticky:last-child:hover {
display: block;
opacity: 1;
transition: 0.15s;
pointer-events: auto;
}
@supports (-ms-ime-align:auto) {
.dropdown > *:last-child:hover {
display: block;
opacity: 1;
pointer-events: auto;
}
}
/* detect IE and do the same thing. */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
.dropdown > *:last-child:hover {
display: block;
opacity: 1;
pointer-events: auto;
}
}
.dropdown:not(.sticky) > *:not(:last-child):focus,
.dropdown:focus {
pointer-events: none; /* Causes second click to close */
}
.downarrow:focus {
outline: 2px solid #8BF;
outline: 2px solid #48F8;
}
.cb-item {
display: block;
margin: 0px;
color: #000;
width: 190px;
text-align: center;
}
a.cb-item {
color: #000;
}
.cb-item:hover, .cb-item:hover > a:visited {
color: #fff;
background-color: #eee;
}
.cb-item-a{
padding: 10px 20px;
border-top: 1px solid;
display: block;
color: #000;
text-decoration: none;
}
ul{
width: max-content;
margin:0;
padding:0;
}
HTML：
<div class="dropdown">
<div class="dd-box" tabindex="0">Select Status <span class="plus"> + </span></div>
<div class="less-sticky">
<ul>
<li class="cb-item"><a class="cb-item-a" href="#">Open</a></li>
<li class="cb-item"><a class="cb-item-a" href="#">Revised</a></li>
<li class="cb-item"><a class="cb-item-a" href="#">In Review</a></li>
<li class="cb-item"><a class="cb-item-a" href="#">Complete</a></li>
<li class="cb-item"><a class="cb-item-a" href="#">Ready</a></li>
<li class="cb-item"><a class="cb-item-a" href="#">Assigned</a></li>
<li class="cb-item"><a class="cb-item-a" href="#">Working</a></li>
</ul>
</div>
</div>