[英]Need help toggling dropdown menus using the same class (Javascript)
我正在嘗試使用類名“ .sub-menu-parent”使它適用於所有元素,但我只能使其在其第一個實例中起作用。
我嘗試過使用帶有parentClass索引的for循環,但是它似乎不起作用。 '.sub-menu-child'類也是如此。
<nav>
<div class="row">
<img src="resources/img/logos/HTH_Logo_1_2.png" alt="A logo that says 'hearts that heal'" class="logo">
<ul class="main-nav">
<li><a href="index.html">Home</a></li>
<li><a href="#" class="sub-menu--parent">About Us <i class="ion-android-arrow-dropdown"></i></a>
<ul class="drop-down-main sub-menu--child">
<li><a href="#">Who We Are</a></li>
<li><a href="#">Mission Statement</a></li>
<li><a href="#">Vision Statement</a></li>
<li><a href="#">Our Values</a></li>
<li><a href="#">Goals</a></li>
<li><a href="#">Objectives</a></li>
</ul>
</li>
<li><a href="#" class="sub-menu--parent">Photo Gallery <i class="ion-android-arrow-dropdown"></i></a>
<ul class="drop-down-main sub-menu--child">
<li><a href="#">Group Photos</a></li>
<li><a href="#">Retreat Photos</a></li>
<li><a href="#">Members Photos</a></li>
<li><a href="#">Honorary Members Photos</a></li>
<li><a href="#">Our Beloved Children</a></li>
<li><a href="#">Activities and Sponsorship Photos</a></li>
</ul>
</li>
<li><a href="contact.html">Contact</a></li>
</ul>
</div>
</nav>
/* ----- MAIN NAV ----- */
.main-nav {
float: right;
list-style-type: none;
margin-top: 32.5px;
}
.main-nav li {
display: inline;
text-align: center;
}
.main-nav li a:link,
.main-nav li a:visited {
text-decoration: none;
color: #fff;
padding: 5px 10px;
font-weight: 400;
font-size: 80%;
background-color: #c95a6c; /* #484066 */
border-top-left-radius: 10px;
border-top-right-radius: 10px;
}
.main-nav li a:hover,
.main-nav li a:active {
background-color: #fff;
color: #c95a6c;
}
/* ----- For colors ----- */
.main-nav-color:focus {
color: #c95a6c !important;
background-color: #fff !important; /* #484066 */
}
/* ----- NESTED NAV ----- */
.drop-down-main {
position: absolute;
z-index: 9990;
background-color: #fff;
display: none;
margin-top: 5px;
border: 1px solid #484066;
border-top: none;
}
.show {
display: block;
}
.drop-down-main li {
display: block;
text-align: left;
border-bottom: 1px solid #484066;
width: 100%;
}
.drop-down-main li a:link,
.drop-down-main li a:visited {
display: block;
text-decoration: none;
color: #c95a6c;
font-weight: 400;
font-size: 80%;
background: none; /* #484066 */
border-radius: 0;
padding: 5px 24px 5px 5px;
}
.drop-down-main li:hover,
.drop-down-main li:active {
background-color: #c95a6c;
}
.drop-down-main li a:hover,
.drop-down-main li a:active {
color: #fff;
}
.drop-down-main li:first-child {
margin-top: 10px;
border-top: 1px solid #484066;
}
.drop-down-main li:last-child {
border: none;
}
var menuToggle = (function() {
var DOMstrings = {
displayToggle: 'show',
dropParent: '.sub-menu--parent',
dropChild: '.sub-menu--child',
colorToggle: 'main-nav-color',
};
var parentClass = document.querySelector(DOMstrings.dropParent);
var childClass = document.querySelector(DOMstrings.dropChild);
parentClass.addEventListener('click', toggleDropdown, false);
function toggleDropdown() {
childClass.classList.toggle(DOMstrings.displayToggle);
parentClass.classList.toggle(DOMstrings.colorToggle);
};
window.addEventListener('click', function(event) {
if(event.target !== parentClass && event.target.parentNode !== parentClass) {
childClass.classList.remove(DOMstrings.displayToggle);
parentClass.classList.remove(DOMstrings.colorToggle);
}
});
})();
我也嘗試過使用querySelectorAll,但是似乎不能將classList方法與它一起使用。
您應該使用querySelectorAll
根據以下答案: 將事件偵聽器添加到基於類的DOM元素
document.querySelector('.class-name');
將僅選擇第一個具有class='class-name'
元素。 要將事件偵聽器添加到所有此類元素,請使用querySelectorAll()
然后在附加偵聽器的位置更新代碼。
var parentClasses = document.querySelectorAll(DOMstrings.dropParent);
for (var i = 0; i < parentClasses.length; i++) {
parentClasses[i].addEventListener('click', setupEventListener(parentClasses[i]), false);
}
function setupEventListener(element){
return function(){
toggleDropdown(element);
}
}
function toggleDropdown(element) {
// since `ul` is a sibling of `a`
element.nextElementSibling.classList.toggle(DOMstrings.displayToggle);
element.classList.toggle(DOMstrings.colorToggle);
};
我認為這應該適用於您當前的實現,但是其中不包含用於切換顯示的代碼。
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