Question

我创建了一个自定义下拉列表，其中包含两个列表项，即预定义和自定义。问题是下拉列表中箭头的位置是固定的。当选择下拉列表中的第一个列表项时，它看起来不错，但是当选择第二个列表项时，它会在列表项和箭头之间显示太多的间隙。我希望根据所选的列表项调整箭头位置。这是我的代码。

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
function DropDown(el) {
    this.dd = el;
    this.opts = this.dd.find('ul.dropdown > li');
    this.initEvents();
}
DropDown.prototype = {
    initEvents : function() {
        var obj = this;

        obj.dd.on('click', function(event){
            $(this).toggleClass('active');
            event.stopPropagation();
        }); 

        obj.opts.on('click',function(){
            var opt = $(this);
            var orgVal = $("#ddtext").text();
            obj.val = opt.text();
            obj.index = opt.index();
            $("#ddtext").text(obj.val);
            opt.text(orgVal);
            $(this).css('wrapper-dropdown-7');

        });
    }
}
$(function() {

                var dd = new DropDown( $('#dd') );

                $(document).click(function() {
                    // all dropdowns
                    //$('.wrapper-dropdown-5').removeClass('active');
                });

            });

</script>
<style>
.wrapper-dropdown-5 {
    /* Size & position */
    position: relative;
    width: 144px;
    margin: 0 auto;


    /* Styles */
    background: #fff;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease-out;
}
.wrapper-dropdown-5:after { /* Little arrow */
    content: "";
    width: 0;
    height: 0;
    position: absolute;
    left: 150px;
    margin-top: -18px;
    border-width: 9px 9px 0 7px;
    border-style: solid;
    border-color: #067ab4 transparent;
}
.wrapper-dropdown-5 .dropdown {
    /* Size & position */
    position: absolute;
    top: 30%;
    left: -38;
    right: 0;

    /* Styles */

    list-style: none;
    transition: all 0.3s ease-out;

    /* Hiding */
    max-height: 0;
    overflow: hidden;
}
.wrapper-dropdown-5 .dropdown li a {
    display: block;
    text-decoration: none;
    color: #067ab4;
    padding: 0px 0;
    transition: all 0.3s ease-out; 
}
/* Hover state */
.wrapper-dropdown-5 .dropdown li:hover a {
    color: #57a9d9;
}
.wrapper-dropdown-5.active .dropdown {
    border-bottom: 0px solid rgba(0,0,0,0.2);
    max-height: 400px;
}
div#dd
{
color: #067ab4;
font: 30px tahoma;
display: inline-block;
margin-top: 45px;
}
div#textA
{
display: inline-block;
font: 30px tahoma;
padding-left: 20px;
margin-top: 45px;
}
div#textB
{
display: inline-block;
font: 30px tahoma;
padding-left: 40px;
margin-top: 45px;
}
span#ddtext
{
border-bottom: 1px solid #067ab4;
padding-bottom: 5px;
padding-left: 0px;
}
</style>
</head>
<body>   <div id="textA">I want to select a</div>
         <div id="dd" class="wrapper-dropdown-5" tabindex="1"><span id="ddtext">Predefined</span>
    <ul class="dropdown">
        <li><a href="#">Custom</a></li>
    </ul>
</div>
<div  id="textB">profile</div>
    </body>
   <html>

Answer 1

您只需要对CSS进行一些更改，这里有小提琴：http://jsfiddle.net/Ls6pb/1/

以下是我对CSS的编辑：

.wrapper-dropdown-5 {
    /* Size & position */
    position: relative;
    /*width: 144px;*/
    margin: 0 auto;


    /* Styles */
    background: #fff;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease-out;
}
span#ddtext:after{
    content:" ▾"
}
/* Little arrow .wrapper-dropdown-5:after { 
    content: "";
    width: 0;
    height: 0;
    position: absolute;
    left: 150px;
    margin-top: -18px;
    border-width: 9px 9px 0 7px;
    border-style: solid;
    border-color: #067ab4 transparent;
}*/
.wrapper-dropdown-5 .dropdown {
    /* Size & position */
    position: absolute;
    top: 30%;
    left: -38;
    right: 0;

    /* Styles */

    list-style: none;
    transition: all 0.3s ease-out;

    /* Hiding */
    max-height: 0;
    overflow: hidden;
}
.wrapper-dropdown-5 .dropdown li a {
    display: block;
    text-decoration: none;
    color: #067ab4;
    padding: 0px 0;
    transition: all 0.3s ease-out; 
}
/* Hover state */
.wrapper-dropdown-5 .dropdown li:hover a {
    color: #57a9d9;
}
.wrapper-dropdown-5.active .dropdown {
    border-bottom: 0px solid rgba(0,0,0,0.2);
    max-height: 400px;
}
div#dd
{
color: #067ab4;
font: 30px tahoma;
display: inline-block;
margin-top: 45px;
}
div#textA
{
display: inline-block;
font: 30px tahoma;
padding-left: 20px;
margin-top: 45px;
}
div#textB
{
display: inline-block;
font: 30px tahoma;
/*padding-left: 40px;*/
margin-top: 45px;
}
span#ddtext
{
border-bottom: 1px solid #067ab4;
padding-bottom: 5px;
padding-left: 0px;
}

将箭头定位在自定义下拉列表中

1 个答案: