我正在尝试创建一个重置过滤器按钮，重置下拉框而不重新加载页面。
重置过滤器按钮设法将下拉框重置为默认值而不重新加载页面，但重置下拉框后，下拉框中的html不再起作用。
的index.php
<button style="width: 100%; height: 40px" name="resetFilter" id="resetFilter">Reset filters</button>
<section class="main2">
<div class="wrapper-demo2">
<div id="dd2" class="wrapper-dropdown-2" tabindex="1">
<span class="transport">Select mode of transport</span>
<ul class="dropdownTransport" tabindex="1">
<li value="Driving"><a href="#">Driving</a></li>
<li value="Transit"><a href="#">Transit</a></li>
</ul>
</div>
</div>
</section>
<script src="js/dropdown2.js"></script>
<script src="js/index.js"></script>
index.js
$(function(e) {
$('#resetFilter').click(function(e) {
var dropdownClone2 = $(".wrapper-demo2").clone();
$(".wrapper-demo2").html(dropdownClone2);
e.preventDefault();
});
dropdown2.js
function DropDown2(el) {
this.dd = el;
this.placeholder = this.dd.children('span.transport');
this.opts = this.dd.find('ul.dropdownTransport > li');
this.val = '';
this.index = -1;
this.initEvents();
}
DropDown2.prototype = {
initEvents : function() {
var obj = this;
obj.dd.on('click', function(event){
$(this).toggleClass('active');
return false;
});
obj.opts.on('click',function(){
var opt = $(this);
obj.val = opt.text();
obj.index = opt.index();
obj.placeholder.text('Option: ' + obj.val);
});
},
getValue : function() {
return this.val;
},
getIndex : function() {
return this.index;
}
}
$(function() {
var dd2 = new DropDown2( $('#dd2') );
$(document).click(function() {
// all dropdowns
$('.wrapper-dropdown-2').removeClass('active');
});
});
首先，将data-initial-value添加到dd2对象中以重置跨度：
<div id="dd2" class="wrapper-dropdown-2" tabindex="1" data-initial-value="Select mode of transport">
克隆下拉列表时，将删除所有侦听器。所以你必须再次初始化，并克隆孩子们：
$('#resetFilter').click(function(e) {
var dropdownClone2 = $('.wrapper-demo2').children().clone();
$(".wrapper-demo2").html(dropdownClone2);
new DropDown2( $('#dd2') ); // initialize the new DropDown
e.preventDefault();
});
在DropDown构造函数中：
function DropDown2(el) {
this.dd = el;
this.placeholder = this.dd.children('span.transport');
this.placeholder.html(this.dd.attr("data-initial-value"));
这是完整的HTML / JS（全部在一个文件中）：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Test</title>
<script src="jquery.min.js"></script>
</head>
<body>
<button style="width: 100%; height: 40px" name="resetFilter" id="resetFilter">Reset filters</button>
<section class="main2">
<div class="wrapper-demo2">
<div id="dd2" class="wrapper-dropdown-2" tabindex="1" data-initial-value="Select mode of transport">
<span class="transport">Select mode of transport</span>
<ul class="dropdownTransport" tabindex="1">
<li value="Driving"><a href="#">Driving</a></li>
<li value="Transit"><a href="#">Transit</a></li>
</ul>
</div>
</div>
</section>
<script type="text/javascript">
/*<![CDATA[*/
$(function(e) {
$('#resetFilter').click(function(e) {
var dropdownClone2 = $('.wrapper-demo2').children().clone();
$(".wrapper-demo2").html(dropdownClone2);
var dd2 = new DropDown2( $('#dd2') );
e.preventDefault();
});
});
function DropDown2(el) {
this.dd = el;
this.placeholder = this.dd.children('span.transport');
this.placeholder.html(this.dd.attr("data-initial-value"));
this.opts = this.dd.find('ul.dropdownTransport > li');
this.opts.removeClass("selected"); // <<<< NEW
this.val = '';
this.index = -1;
this.initEvents();
}
DropDown2.prototype = {
initEvents : function() {
var obj = this;
obj.dd.on('click', function(event){
$(this).toggleClass('active');
return false;
});
obj.opts.on('click',function(){
var opt = $(this);
obj.val = opt.text();
obj.index = opt.index();
obj.placeholder.text('Option: ' + obj.val);
obj.opts.removeClass("selected"); // <<<< NEW
opt.addClass("selected"); // <<<< NEW
});
},
getValue : function() {
return this.val;
},
getIndex : function() {
return this.index;
}
}
$(function() {
var dd2 = new DropDown2( $('#dd2') );
$(document).click(function() {
// all dropdowns
$('.wrapper-dropdown-2').removeClass('active');
});
});
/*]]>*/
</script>
</body>
</html>