删除课程后如何找回课程？

Question

我有一个带右侧箭头的下拉菜单，单击该菜单时该箭头应该向下。但是当您再次单击菜单时，它不会返回。您可以在下图中看到示例：

当您不单击任何内容时：

https://i.gyazo.com/b7cec5471aa9beff1611421e3ff36747.png

当您单击任何内容时：

https://i.gyazo.com/5744d2459c19d2f9a490a5fe337b4ec8.png

当您单击同一项目时（箭头不会向后移动）

https://i.gyazo.com/b324f91d673e8ad98645f9be95298a30.png

我的Jquery代码：

// menu toggle
    jQuery(".advanced-sidebar-nav").on(
        "click",
        ".advanced-sidebar-nav-toggle",
        function(e) {
            e.preventDefault();


            jQuery(".advanced-sidebar-nav-menu-open").each(
                function() {
                    $(this).removeClass("advanced-sidebar-nav-menu-open").siblings("ul").slideUp(300);
                    $(this).children(".advanced-sidebar-nav-toggle-open").removeClass("advanced-sidebar-nav-toggle-open");
                }
            );

            jQuery(this).toggleClass("advanced-sidebar-nav-toggle-open");

            if(jQuery(this).hasClass("advanced-sidebar-nav-toggle-open")) {
                jQuery(this)
                      .parent("a")
                      .addClass("advanced-sidebar-nav-menu-open")
                      .siblings("ul")
                      .slideDown(300);

                  } else {
                    jQuery(this)
                      .parent("a")
                      .removeClass("advanced-sidebar-nav-menu-open")
                      .siblings("ul")
                      .slideUp(300);
                  }
        }
    );

HTML代码：

<div class="advanced-sidebar-nav advanced-sidebar-nav-default"><ul id="menu-sidebar-menu" class="advanced-sidebar-menu"><li id="menu-item-4701" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-4701"><a href="#">Laptops<span class="advanced-sidebar-nav-toggle"></span></a>
<ul class="sub-menu">
    <li id="menu-item-4696" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4696"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/laptops/i3/" style="padding-left:40px !important">i3</a></li>
    <li id="menu-item-4697" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4697"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/laptops/i5/" style="padding-left:40px !important">i5</a></li>
    <li id="menu-item-4698" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4698"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/laptops/i7/" style="padding-left:40px !important">i7</a></li>
    <li id="menu-item-4695" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4695"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/laptops/game-laptops/" style="padding-left:40px !important">Game laptops</a></li>
</ul>
</li>
<li id="menu-item-4703" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-4703"><a href="#">Computers<span class="advanced-sidebar-nav-toggle"></span></a>
<ul class="sub-menu">
    <li id="menu-item-4709" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4709"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/computers/tower/" style="padding-left:40px !important">Tower</a></li>
    <li id="menu-item-4710" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4710"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/computers/workstation/" style="padding-left:40px !important">Workstation</a></li>
    <li id="menu-item-4708" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4708"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/computers/game-computers/" style="padding-left:40px !important">Game computers</a></li>
</ul>
</li>
<li id="menu-item-4704" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-4704"><a href="#">Monitoren<span class="advanced-sidebar-nav-toggle"></span></a>
<ul class="sub-menu">
    <li id="menu-item-4712" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4712"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/monitoren/19/" style="padding-left:40px !important">19″</a></li>
    <li id="menu-item-4713" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4713"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/monitoren/22/" style="padding-left:40px !important">22″</a></li>
    <li id="menu-item-4714" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4714"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/monitoren/24/" style="padding-left:40px !important">24″</a></li>
    <li id="menu-item-4715" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4715"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/monitoren/27/" style="padding-left:40px !important">27″</a></li>
    <li id="menu-item-4716" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4716"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/monitoren/32/" style="padding-left:40px !important">32″</a></li>
</ul>
</li>
<li id="menu-item-4705" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-4705"><a href="#">Netwerkapparatuur<span class="advanced-sidebar-nav-toggle"></span></a>
<ul class="sub-menu">
    <li id="menu-item-4721" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4721"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/netwerkapparatuur/switchers/" style="padding-left:40px !important">Switchers</a></li>
    <li id="menu-item-4718" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4718"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/netwerkapparatuur/nas/" style="padding-left:40px !important">Nas</a></li>
    <li id="menu-item-4722" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4722"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/netwerkapparatuur/thin-clients/" style="padding-left:40px !important">Thin clients</a></li>
    <li id="menu-item-4717" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4717"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/netwerkapparatuur/accespoints/" style="padding-left:40px !important">Access Points</a></li>
    <li id="menu-item-4719" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4719"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/netwerkapparatuur/repeaters/" style="padding-left:40px !important">Repeaters</a></li>
    <li id="menu-item-4720" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4720"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/netwerkapparatuur/routers/" style="padding-left:40px !important">Routers</a></li>
</ul>
</li>
<li id="menu-item-4706" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-4706"><a href="#">Hard Drive<span class="advanced-sidebar-nav-toggle"></span></a>
<ul class="sub-menu">
    <li id="menu-item-4725" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4725"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/hard-drive/ssd-drive/" style="padding-left:40px !important">SSD Drive</a></li>
    <li id="menu-item-4726" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4726"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/hard-drive/ssd-m-2/" style="padding-left:40px !important">SSD M.2</a></li>
    <li id="menu-item-4727" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4727"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/hard-drive/ssd-msata/" style="padding-left:40px !important">SSD Msata</a></li>
    <li id="menu-item-4723" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4723"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/hard-drive/sata-2-5/" style="padding-left:40px !important">Sata 2.5″</a></li>
    <li id="menu-item-4724" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4724"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/hard-drive/sata-3-5/" style="padding-left:40px !important">Sata 3.5″</a></li>
</ul>
</li>
<li id="menu-item-4707" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-4707"><a href="#">Accessoires<span class="advanced-sidebar-nav-toggle"></span></a>
<ul class="sub-menu">
    <li id="menu-item-4729" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4729"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/accessoires/kabels/" style="padding-left:40px !important">Kabels</a></li>
    <li id="menu-item-4728" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4728"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/accessoires/adapters/" style="padding-left:40px !important">Adapters</a></li>
    <li id="menu-item-4730" class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-4730"><a href="http://projecten.jumsum.nl/adtcomputers/product-category/accessoires/memory/" style="padding-left:40px !important">Memory</a></li>
</ul>
</li>
</ul></div>

Answer 1

之所以发生这种情况，是因为您每次单击都删除了所有-open类，然后立即将其添加到当前元素中。因此，下一次将是相同的-删除+添加，因此每次单击将添加-open类。要解决此问题，您不应使用以下内容删除活动元素的-open类：

        const self = this;

        jQuery(".advanced-sidebar-nav-menu-open").each(
            function() {
                $(this).removeClass("advanced-sidebar-nav-menu-open").siblings("ul").slideUp(300);
                $(this).children(".advanced-sidebar-nav-toggle-open").not(self).removeClass("advanced-sidebar-nav-toggle-open");
            }
        );