javascript - Jquery event.preventDefault() 不工作

Question

我希望我的菜单在点击时显示和隐藏列表项，默认情况下它们是隐藏的。问题是我的菜单是在管理部分生成的，因此如果我在菜单选项中将特定链接的 URL 字段设置为空，它会自动将网站的 url 分配给它。所以当我点击它时，它会重新加载主页。

我想要的是，当我单击任何父 li 时，它应该停止生成默认事件，以便防止默认。但就我而言，它不起作用，它会在显示父项的列表项后重新加载页面。

这是一个 fiddle Fiddle

HTML

<div class="mega-col col-xs-12 col-sm-12 col-md-4" data-type="menu">
    <div class="mega-col-inner">
        <ul>
            <li class="parent dropdown-submenu mega-group"><a class="dropdown-toggle" data-toggle="dropdown" href=""><span class="menu-title">Massachusetts Stores</span><b class="caret"></b></a>
                <div class="dropdown-mega level2">
                    <div class="dropdown-menu-inner">
                        <div class="row">
                            <div class="col-sm-12 mega-col" data-colwidth="12" data-type="menu">
                                <div class="mega-col-inner">
                                    <ul>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=24"><span class="menu-title">Burlington Mall, MA</span></a>
                                        </li>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=25"><span class="menu-title">Burlington Mall, MA - Cart</span></a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </li>
            <li class="parent dropdown-submenu mega-group"><a class="dropdown-toggle" data-toggle="dropdown" href=""><span class="menu-title">New Jersey Stores</span><b class="caret"></b></a>
                <div class="dropdown-mega level2">
                    <div class="dropdown-menu-inner">
                        <div class="row">
                            <div class="col-sm-12 mega-col" data-colwidth="12" data-type="menu">
                                <div class="mega-col-inner">
                                    <ul>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=26"><span class="menu-title">Brunswick Square Mall, NJ</span></a>
                                        </li>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=30"><span class="menu-title">Garden State Plaza, NJ</span></a>
                                        </li>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=27"><span class="menu-title">Menlo Park Mall, NJ</span></a>
                                        </li>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=29"><span class="menu-title">Ocean County Mall, NJ</span></a>
                                        </li>
                                        <li class=" "><a href=""><span class="menu-title">Rockaway Townsquare, NJ</span></a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </li>
            <li class="parent dropdown-submenu mega-group"><a class="dropdown-toggle" data-toggle="dropdown" href=""><span class="menu-title">New York Stores</span><b class="caret"></b></a>
                <div class="dropdown-mega level2">
                    <div class="dropdown-menu-inner">
                        <div class="row">
                            <div class="col-sm-12 mega-col" data-colwidth="12" data-type="menu">
                                <div class="mega-col-inner">
                                    <ul>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=31"><span class="menu-title">Galleria at White Plains, NY</span></a>
                                        </li>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=42"><span class="menu-title">Manhattan, NY-Toys 'R' Us </span></a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </li>
            <li class="parent dropdown-submenu mega-group"><a class="dropdown-toggle" data-toggle="dropdown" href=""><span class="menu-title">North Carolina Stores</span><b class="caret"></b></a>
                <div class="dropdown-mega level2">
                    <div class="dropdown-menu-inner">
                        <div class="row">
                            <div class="col-sm-12 mega-col" data-colwidth="12" data-type="menu">
                                <div class="mega-col-inner">
                                    <ul>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=32"><span class="menu-title">CrabTree Valley, NC</span></a>
                                        </li>
                                        <li class=" "><a href="index.php?route=common/location_details&amp;loc_id=2"><span class="menu-title">Fayetteville, NC</span></a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </li>
        </ul>
    </div>
</div>

JS:

  $("#li_menu169 li.parent.dropdown-submenu.mega-group").click(function(event) {
    var id = $(this).prop('id');
    if (id == 'yes') {

        //i want to prevent
    } else {
        event.preventDefault();
        $(this).children('.dropdown-mega.level2').show();
        $(this).children('.dropdown-mega.level2').hide();
        //redirect
    }
});

Css

li.parent.dropdown-submenu.mega-group .dropdown-mega.level2 {
display: none;
}
li
 {
padding:10px;
position: relative;
margin:auto;
}

Answer 1

这是一个工作示例:http://jsfiddle.net/hk1w89zw/

不确定您试图通过 id prop 实现什么目标.一般来说，最好设置 onClick链接上的事件(<a> -标签)而不是 li .并使用以下 jQuery 代码:

$("li.parent.dropdown-submenu.mega-group > a").on('click', function(event) {
    event.preventDefault();
    $('.dropdown-mega.level2').hide();
    $(this).closest('.parent').find('.dropdown-mega.level2').show();
});