如何从选定的 li 中获取值?
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【中文标题】如何从选定的 li 中获取值?【英文标题】:How to get the value from a selected li? 【发布时间】:2018-02-28 23:23:48 【问题描述】:我从 CodePen 复制了一个水平选择菜单,这里是 source code
结果如下:
var btn = document.querySelector("button")
var dropdown = document.querySelector(".dropdown-options")
var optionLinks = document.querySelectorAll(".option a")
console.log(optionLinks)
btn.addEventListener("click", function(e)
e.preventDefault()
console.log("btn")
dropdown.classList.toggle("open")
);
var clickFn = function(e)
e.preventDefault()
dropdown.classList.remove("open")
btn.innerhtml = this.text
var activeLink = document.querySelector(".option .active")
if (activeLink)
activeLink.classList.remove("active")
this.classList.add("active")
for (var i = 0; i < optionLinks.length; i++)
optionLinks[i].addEventListener("mousedown", clickFn, false)
.container
max-width: 500px;
margin-top: 10px;
margin-left: 0px;
.container button
position: relative;
background: none;
border: none;
outline: none;
font-size: 16px;
border-bottom: 2px solid #9b9b9b;
padding-bottom: 8px;
min-width: 150px;
text-align: left;
outline: none;
cursor: pointer;
z-index: 2;
.container button:after
content: '▾';
position: absolute;
right: 0px;
top: 0%;
color: rgb(142, 142, 142);
.container .dropdown
position: relative;
.container .dropdown .dropdown-options
list-style: none;
margin: 0;
padding: 0;
background: white;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.24);
display: inline-block;
position: absolute;
left: 0;
bottom: 0;
opacity: 0;
-webkit-transform: scale(0.8) translate3d(-20px, 0px, 0);
transform: scale(0.8) translate3d(-20px, 0px, 0);
-webkit-transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), -webkit-transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), -webkit-transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75), -webkit-transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
-webkit-transform-origin: 0 100%;
transform-origin: 0 100%;
z-index: 1;
.container .dropdown .dropdown-options.open
opacity: 1;
-webkit-transform: scale(1) translate3d(0, 0, 0);
transform: scale(1) translate3d(0, 0, 0);
z-index: 5;
.container .dropdown .dropdown-options li
display: inline-block;
.container .dropdown .dropdown-options li a
text-decoration: none;
display: inline-block;
padding: 10px 16px;
color: #2975DA;
.container .dropdown .dropdown-options li a:hover
color: #2269c7;
.container .dropdown .dropdown-options li a.active
border-bottom: 2px solid #9b9b9b;
color: #9b9b9b;
.container .dropdown .dropdown-options li a.active:hover
color: #9b9b9b;
<div class="container">
<div class="dropdown">
<button>Type</button>
<ul class="dropdown-options">
<li class="option">
<a href="#">A</a>
</li>
<li class="option">
<a href="#">B</a>
</li>
<li class="option">
<a href="#">C</a>
</li>
<li class="option">
<a href="#">D</a>
</li>
</ul>
</div>
</div>
在提交此表单之前,我不知道如何获取selected li
。这不是<select>
,我在表单中使用此菜单,有没有一种简单的方法可以使用javascript
获取li
的选定值?
【问题讨论】:
你是“a”键卡住还是什么? 代码是一个菜单而不是一个下拉菜单,并且在这个网站上有一个确切的答案,你应该刚刚搜索而不那么懒惰。 How to get the innerHTML of selectable jquery element?的可能重复 【参考方案1】:这里有一个解决方案https://jsfiddle.net/9Lk8vwvL/
var btn = document.querySelector("button")
var dropdown = document.querySelector(".dropdown-options")
var optionLinks = document.querySelectorAll(".option a")
btn.addEventListener("click", function(e)
e.preventDefault()
dropdown.classList.toggle("open")
);
var clickFn = function(e)
console.log(e.target.innerText);
e.preventDefault()
dropdown.classList.remove("open")
btn.innerHTML = this.text
var activeLink = document.querySelector(".option .active")
if (activeLink)
activeLink.classList.remove("active")
this.classList.add("active")
for (var i = 0; i < optionLinks.length; i++)
optionLinks[i].addEventListener("mousedown", clickFn, false)
.container
max-width: 500px;
margin-top: 10px;
margin-left: 0px;
.container button
position: relative;
background: none;
border: none;
outline: none;
font-size: 16px;
border-bottom: 2px solid #9b9b9b;
padding-bottom: 8px;
min-width: 150px;
text-align: left;
outline: none;
cursor: pointer;
z-index: 2;
.container button:after
content: '▾';
position: absolute;
right: 0px;
top: 0%;
color: rgb(142, 142, 142);
.container .dropdown
position: relative;
.container .dropdown .dropdown-options
list-style: none;
margin: 0;
padding: 0;
background: white;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.24);
display: inline-block;
position: absolute;
left: 0;
bottom: 0;
opacity: 0;
-webkit-transform: scale(0.8) translate3d(-20px, 0px, 0);
transform: scale(0.8) translate3d(-20px, 0px, 0);
-webkit-transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), -webkit-transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), -webkit-transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
transition: opacity 0.1s cubic-bezier(0.5, 2, 0.5, 0.75), transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75), -webkit-transform 0.3s cubic-bezier(0.5, 2, 0.5, 0.75);
-webkit-transform-origin: 0 100%;
transform-origin: 0 100%;
z-index: 1;
.container .dropdown .dropdown-options.open
opacity: 1;
-webkit-transform: scale(1) translate3d(0, 0, 0);
transform: scale(1) translate3d(0, 0, 0);
z-index: 5;
.container .dropdown .dropdown-options li
display: inline-block;
.container .dropdown .dropdown-options li a
text-decoration: none;
display: inline-block;
padding: 10px 16px;
color: #2975DA;
.container .dropdown .dropdown-options li a:hover
color: #2269c7;
.container .dropdown .dropdown-options li a.active
border-bottom: 2px solid #9b9b9b;
color: #9b9b9b;
.container .dropdown .dropdown-options li a.active:hover
color: #9b9b9b;
<div class="container">
<div class="dropdown">
<button>Type</button>
<ul class="dropdown-options">
<li class="option">
<a href="#">A</a>
</li>
<li class="option">
<a href="#">B</a>
</li>
<li class="option">
<a href="#">C</a>
</li>
<li class="option">
<a href="#">D</a>
</li>
</ul>
</div>
</div>
由于你在clickFn
方法中有事件,你可以使用console.log(e.target.innerText);
希望这将帮助您获得选定的li
值。
【讨论】:
【参考方案2】:在您的 clickFn
函数中,您已经将所选链接设置为 button
innerHTML - btn.innerHTML = this.text;
button
的默认文本是 Type
。您可以在表单提交期间检查按钮文本,例如:
if (btn.innerText === "Type")
//Option not selected - Alert user
else
//Option selected - Validate other fields
【讨论】:
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