单击以关闭移动设备上的jQuery下拉菜单，同时保留其他行为 [英] Click to close jQuery dropdown menu on mobile devices while retaining other behavior

问题描述

我有一个非常简单的jQuery下拉菜单，其中的链接具有通常的ul/li列表排列方式.下拉菜单的代码如下:

I have a pretty simple jQuery dropdown menu with links in the usual ul/li list arrangement. The code for the dropdown is as follows:

$('body').ready(function() {
      if(screen.width <= 720) {
          $('.dropdown').hover(function() { $(this).find('.subMenu').toggle(); });
          $('.dropdown').click(function() { if( $('this').css('display') != 'none') {
              $('this').toggle();
              }
          });
      }
      else
      {
          $('.dropdown').hover(
              function() { $(this).stop(true,true).find('.subMenu').slideDown("fast"); },
              function() { $(this).stop(true,true).find('.subMenu').hide(); } 
          );
      }
  });

在移动设备上(忽略720宽度，仅用于测试)，我想实现以下功能:

On mobile devices (ignore the 720 width, it's just for testing right now), I would like to achieve the following functionality:

• 用户点击带有下拉菜单的链接>如果打开菜单，则将其关闭

• User taps link with a dropdown menu > If menu is open, close it

当另一个菜单已经打开时，用户点击链接>关闭上一个菜单，打开当前菜单

User taps link while another menu is already open > Close previous menu, open current menu

我发现悬停功能实际上可以处理#2和#3，但是我不知道如何使#1正常工作.我可以肯定地说，我知道为什么要这样做

I found that the hover function actually handles #2 and #3, but I can't figure out how to get #1 working. I'm fairly certain that I know why this particular attempt

$('.dropdown').click(function() { if( $('this').css('display') != 'none') {
      $('this').toggle();
      }
});

失败.我猜想单击(在这种情况下为点击)会触发悬停事件，该事件似乎优先，因此显示菜单而不是隐藏菜单.

fails. I'm guessing that the click (or tap, in this case) triggers the hover event, which seems to take precedence and therefore displays the menu, instead of hiding it.

如何在移动设备上使用它?

How can I get this working on mobile devices?

我正在使用jQuery v1.7.2

I'm using jQuery v1.7.2

HTML列表结构如下所示，以防它对某人有所帮助(删节版):

HTML list structure is as follows, in case it helps someone (abridged version):

    <div id="navbar">
      <ul>
        <li class="dropdown"><a href="#">Link A</a></li>
        <li class="dropdown"><a href="#">Link B</a>
          <ul class="subMenu">
            <li><a href="#">Link 1</a></li>
            <li><a href="#">Link 2</a></li>
          </ul>
        </li>
      </ul>
    </div>

推荐答案

如果您使用的是jQuery 1.7+，请在此处尝试此演示

If you use jq 1.7+ then try this DEMO HERE http://jsfiddle.net/SCN5T/3/

$(function(){
    $(document).mousedown(function(){
         $('.dropdown .active').removeClass('active').children('ul').hide();
    })
    $('.dropdown').on('mousedown','.subMenu', function(e){
        e.stopPropagation();
        var elem = $(this);
        if(elem.is('.active')) {
            elem.children('ul').slideUp(150);
            elem.removeClass('active');
        } else {
             $('.dropdown .active').removeClass('active').children('ul').hide();
            elem.addClass('active').children('ul').slideDown(150);
        }
    });
    $('.subMenu').on('mousedown','ul', function(e){
        e.stopPropagation();
        alert('menu item clicked');
    });       
})

这篇关于单击以关闭移动设备上的jQuery下拉菜单，同时保留其他行为的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！