当我通过 Javascript 更改 ID 的 CSS 类时，我的 jQuery 导航栏没有反映更改..？答案

【问题标题】：When I alter an ID's CSS class via Javascript, my jQuery nav bar doesn't reflect the change..?当我通过 Javascript 更改 ID 的 CSS 类时，我的 jQuery 导航栏没有反映更改..？
【发布时间】：2010-08-25 03:10:27
【问题描述】：

我在它自己的文件 nav_bar.shtml 中有一个单独的主导航栏，所有其他页面都包含该导航栏。这个菜单栏是一个 jQuery 菜单栏（ApyCom 是销售这些导航栏的公司的名称）。导航栏上的项目如何确定它是否处于活动状态（从而突出显示它以便用户知道）是通过列表项目上的 class="current" 来确定的。这是我可以做的——我可以使用 JavaScript 更改列表项的类属性。我在 JavaScript 中有一个 switch 语句，它通过在 window.onload 函数中使用 window.location.href 来确定要使哪个列表项的类成为“当前”。所有这一切都很好。当我导航到另一个页面时，正确的列表项的类被设为“当前”。

这就是问题所在——即使正确列表项上的类设置为“当前”，它也不会反映在 UI 上。当需要突出显示“联系我”按钮时，主页按钮仍然突出显示（并且应该，因为该列表项的类设置为“当前”。我在想的是，页面中的某些内容可能加载得太晚了，太早等，我不知道为什么它不起作用！！请帮助！！！

具体来说，在“功能”下，单击“1”。现在，在视频下，单击“2”。这些是我用来尝试使其正常工作的测试页面。请注意，点击 Videos -> '2'，'Features' 按钮仍然是灰色的。

这是我的 nav_bar.shtml 页面上的 window.onload JavaScript 函数。请记住，这在更改类名方面做了它应该做的事情，我在 Firebug 中进一步验证了这一点。

        <script type="text/javascript">

            window.onload = function () {
                function change(id, newClass) {
                    identity = document.getElementById(id);
                    identity.className = newClass;
                }

                switch (window.location.href) {
                    case "http://www.grinderschool.com/mikemarks/1.shtml":
                        change('features', 'current');
                        change('videos', '');
                        break;
                    case "http://www.grinderschool.com/mikemarks/2.shtml":
            change('features', '');
                        change('videos', 'current');
                        break;

                }
            }
        </script>

当我点击功能下拉菜单中的“1”时，Firebug 显示：

<div id="menu" class="js-active">
    <ul class="menu">
        <li id="features" class="current"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Features</span></a>
            <div style="visibility: hidden;"><ul>
                <li><a href="http://www.grinderschool.com/"><span style="color: rgb(255, 255, 255);">Home</span></a></li>
                <li><a href="http://www.grinderschool.com/grinderschool-poker-strategy-podcasts.php"><span style="color: rgb(255, 255, 255);">Podcasts</span></a></li>

                        <li><a href="http://www.grinderschool.com/mikemarks/1.shtml"><span style="color: rgb(255, 255, 255);">1</span></a></li>

                <li><a href="http://www.grinderschool.com/grinderschool-low-stakes-poker-strategy-articles.shtml"><span style="color: rgb(255, 255, 255);">Articles</span></a></li>
                <li><a href="http://www.grinderschool.com/grinderschool-low-stakes-poker-strategy-private-coaching.shtml"><span style="color: rgb(255, 255, 255);">Coaching</span></a></li>
                <li><a href="http://www.grinderschool.com/phpBB3/"><span style="color: rgb(255, 255, 255);">Forum</span></a></li>
                <li><a href="http://www.grinderschool.com/grinderschool-tournament-series.php"><span style="color: rgb(255, 255, 255);">GTS</span></a></li>
            </ul></div>
        </li>
        <li id="videos" class=""><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Videos</span></a>
            <div style="visibility: hidden;"><ul>
                <li><a href="http://www.grinderschool.com/sample-poker-videos/"><span style="color: rgb(255, 255, 255);">Sample Videos</span></a></li>

                        <li><a );="" current="" ,="" videos="" change(="" href="http://www.grinderschool.com/mikemarks/2.shtml"><span style="color: rgb(255, 255, 255);">2</span></a></li>

                <li><a href="http://www.grinderschool.com/how-to-master/"><span style="color: rgb(255, 255, 255);">How To Master Series</span></a></li>
                <li><a href="http://www.grinderschool.com/grinderschool-poker-strategy-video-listings.php"><span style="color: rgb(255, 255, 255);">Search/Listings</span></a></li>
                <li><a href="http://www.grinderschool.com/calendar.php"><span style="color: rgb(255, 255, 255);">Schedule</span></a></li>
                <li><a href="http://www.grinderschool.com/about-grinderschool-low-stakes-poker-strategy-videos-and-coaching.shtml"><span style="color: rgb(255, 255, 255);">Instructors</span></a></li>
            </ul></div>
        </li>
        <li id="aboutus"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">About Us</span></a>
            <div style="visibility: hidden;"><ul>
                <li><a href="http://www.grinderschool.com/about-grinderschool-low-stakes-poker-strategy-videos-and-coaching.shtml"><span style="color: rgb(255, 255, 255);">Our Team</span></a></li>
                <li><a href="http://www.grinderschool.com/testimonials/"><span style="color: rgb(255, 255, 255);">Testimonials</span></a></li>
                <li><a href="http://www.grinderschool.com/reviews/"><span style="color: rgb(255, 255, 255);">Reviews</span></a></li>

                        <li><a href="http://www.grinderschool.com/mikemarks/3.shtml"><span style="color: rgb(255, 255, 255);">3</span></a></li>

                <li><a href="http://www.grinderschool.com/newsletters/"><span style="color: rgb(255, 255, 255);">Newsletters</span></a></li>
                <li><a href="http://www.grinderschool.com/advertise-with-grinderschool.shtml"><span style="color: rgb(255, 255, 255);">Advertise</span></a></li>
                <li><a href="http://www.grinderschool.com/contact-us/ "><span style="color: rgb(255, 255, 255);">Contact Us</span></a></li>
            </ul></div>
        </li>
        <li id="subscribe"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Subscribe</span></a>
            <div style="visibility: hidden;"><ul>
                <li><a href="http://www.grinderschool.com/grinderschool-poker-stratey-site-subscription-plans.shtml"><span style="color: rgb(255, 255, 255);">Subscription Plans</span></a></li>
                <li><a href="http://www.grinderschool.com/subscribe/"><span style="color: rgb(255, 255, 255);">Sign Up</span></a></li>
            </ul></div>
        </li>
        <li id="tools"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Tools</span></a>
            <div style="visibility: hidden;"><ul>
                <li><a href="http://www.grinderschool.com/tools/hand-history-converter/"><span style="color: rgb(255, 255, 255);">Hand History Converter</span></a></li>
                <li><a href="http://poker-tools.flopturnriver.com/Tournament-Hand-History-Converter.php"><span style="color: rgb(255, 255, 255);">Tournament Trimmer</span></a></li>
                <li><a href="http://www.grinderschool.com/images/range_chart.png"><span style="color: rgb(255, 255, 255);">Glitlr Short-Stacking Spreadsheet</span></a></li>
                <li><a href="http://www.grinderschool.com/poker-tools/"><span style="color: rgb(255, 255, 255);">Other Programs</span></a></li>
                <li><a href="http://www.cafepress.com/Grinderschool/"><span style="color: rgb(255, 255, 255);">Store</span></a></li>
            </ul></div>
        </li>
        <li id="freemembership"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Free Membership</span></a>
            <div style="visibility: hidden;"><ul>
                <li><a href="http://www.grinderschool.com/grinderschool-rakeback-program.php"><span style="color: rgb(255, 255, 255);">Rakeback</span></a></li>
                <li><a href="http://www.grinderschool.com/grinderschool-prop-player-program.php"><span style="color: rgb(255, 255, 255);">Propping</span></a></li>
                <li><a href="http://www.grinderschool.com/grinderschool-low-stakes-bonus-grind4free-titan-poker.shtml"><span style="color: rgb(255, 255, 255);">Titan Poker</span></a></li>
                <li><a href="http://www.grinderschool.com/grinderschool-free-membership.shtml"><span style="color: rgb(255, 255, 255);">And More!</span></a></li>
            </ul></div>
        </li>

    <li class="back" style="left: 236px; width: 122px; display: block;"><div class="left"></div></li></ul>
</div>

当我从视频下拉菜单中点击“2”时，Firebug 显示：

<div id="menu" class="js-active">
<ul class="menu">
    <li id="features" class=""><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Features</span></a>
        <div style="visibility: hidden;"><ul>
            <li><a href="http://www.grinderschool.com/"><span style="color: rgb(255, 255, 255);">Home</span></a></li>
            <li><a href="http://www.grinderschool.com/grinderschool-poker-strategy-podcasts.php"><span style="color: rgb(255, 255, 255);">Podcasts</span></a></li>

                    <li><a href="http://www.grinderschool.com/mikemarks/1.shtml"><span style="color: rgb(255, 255, 255);">1</span></a></li>

            <li><a href="http://www.grinderschool.com/grinderschool-low-stakes-poker-strategy-articles.shtml"><span style="color: rgb(255, 255, 255);">Articles</span></a></li>
            <li><a href="http://www.grinderschool.com/grinderschool-low-stakes-poker-strategy-private-coaching.shtml"><span style="color: rgb(255, 255, 255);">Coaching</span></a></li>
            <li><a href="http://www.grinderschool.com/phpBB3/"><span style="color: rgb(255, 255, 255);">Forum</span></a></li>
            <li><a href="http://www.grinderschool.com/grinderschool-tournament-series.php"><span style="color: rgb(255, 255, 255);">GTS</span></a></li>
        </ul></div>
    </li>
    <li id="videos" class="current"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Videos</span></a>
        <div style="visibility: hidden;"><ul>
            <li><a href="http://www.grinderschool.com/sample-poker-videos/"><span style="color: rgb(255, 255, 255);">Sample Videos</span></a></li>

                    <li><a );="" current="" ,="" videos="" change(="" href="http://www.grinderschool.com/mikemarks/2.shtml"><span style="color: rgb(255, 255, 255);">2</span></a></li>

            <li><a href="http://www.grinderschool.com/how-to-master/"><span style="color: rgb(255, 255, 255);">How To Master Series</span></a></li>
            <li><a href="http://www.grinderschool.com/grinderschool-poker-strategy-video-listings.php"><span style="color: rgb(255, 255, 255);">Search/Listings</span></a></li>
            <li><a href="http://www.grinderschool.com/calendar.php"><span style="color: rgb(255, 255, 255);">Schedule</span></a></li>
            <li><a href="http://www.grinderschool.com/about-grinderschool-low-stakes-poker-strategy-videos-and-coaching.shtml"><span style="color: rgb(255, 255, 255);">Instructors</span></a></li>
        </ul></div>
    </li>
    <li id="aboutus"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">About Us</span></a>
        <div style="visibility: hidden; height: 195px; overflow: hidden;"><ul>
            <li><a href="http://www.grinderschool.com/about-grinderschool-low-stakes-poker-strategy-videos-and-coaching.shtml"><span style="color: rgb(255, 255, 255);">Our Team</span></a></li>
            <li><a href="http://www.grinderschool.com/testimonials/"><span style="color: rgb(255, 255, 255);">Testimonials</span></a></li>
            <li><a href="http://www.grinderschool.com/reviews/"><span style="color: rgb(255, 255, 255);">Reviews</span></a></li>

                    <li><a href="http://www.grinderschool.com/mikemarks/3.shtml"><span style="color: rgb(255, 255, 255);">3</span></a></li>

            <li><a href="http://www.grinderschool.com/newsletters/"><span style="color: rgb(255, 255, 255);">Newsletters</span></a></li>
            <li><a href="http://www.grinderschool.com/advertise-with-grinderschool.shtml"><span style="color: rgb(255, 255, 255);">Advertise</span></a></li>
            <li><a href="http://www.grinderschool.com/contact-us/ "><span style="color: rgb(255, 255, 255);">Contact Us</span></a></li>
        </ul></div>
    </li>
    <li id="subscribe"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Subscribe</span></a>
        <div style="visibility: hidden; height: 70px; overflow: hidden;"><ul>
            <li><a href="http://www.grinderschool.com/grinderschool-poker-stratey-site-subscription-plans.shtml"><span style="color: rgb(255, 255, 255);">Subscription Plans</span></a></li>
            <li><a href="http://www.grinderschool.com/subscribe/"><span style="color: rgb(255, 255, 255);">Sign Up</span></a></li>
        </ul></div>
    </li>
    <li id="tools"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Tools</span></a>
        <div style="visibility: hidden; height: 170px; overflow: hidden;"><ul>
            <li><a href="http://www.grinderschool.com/tools/hand-history-converter/"><span style="color: rgb(255, 255, 255);">Hand History Converter</span></a></li>
            <li><a href="http://poker-tools.flopturnriver.com/Tournament-Hand-History-Converter.php"><span style="color: rgb(255, 255, 255);">Tournament Trimmer</span></a></li>
            <li><a href="http://www.grinderschool.com/images/range_chart.png"><span style="color: rgb(255, 255, 255);">Glitlr Short-Stacking Spreadsheet</span></a></li>
            <li><a href="http://www.grinderschool.com/poker-tools/"><span style="color: rgb(255, 255, 255);">Other Programs</span></a></li>
            <li><a href="http://www.cafepress.com/Grinderschool/"><span style="color: rgb(255, 255, 255);">Store</span></a></li>
        </ul></div>
    </li>
    <li id="freemembership"><a class="parent" href="http://www.grinderschool.com/" style="background: none repeat scroll 0% 0% transparent;"><span style="background: none repeat scroll 0% 0% transparent; color: rgb(255, 255, 255);">Free Membership</span></a>
        <div style="visibility: hidden; height: 120px; overflow: hidden;"><ul>
            <li><a href="http://www.grinderschool.com/grinderschool-rakeback-program.php"><span style="color: rgb(255, 255, 255);">Rakeback</span></a></li>
            <li><a href="http://www.grinderschool.com/grinderschool-prop-player-program.php"><span style="color: rgb(255, 255, 255);">Propping</span></a></li>
            <li><a href="http://www.grinderschool.com/grinderschool-low-stakes-bonus-grind4free-titan-poker.shtml"><span style="color: rgb(255, 255, 255);">Titan Poker</span></a></li>
            <li><a href="http://www.grinderschool.com/grinderschool-free-membership.shtml"><span style="color: rgb(255, 255, 255);">And More!</span></a></li>
        </ul></div>
    </li>

<li class="back" style="left: 236px; width: 122px; display: block; overflow: hidden;"><div class="left"></div></li></ul>

请注意“当前”已正确应用。

【问题讨论】：

您应该在此处粘贴您的 JavaScript 代码，这样我们就不必寻找它了。
什么是 Firebug 节目？你使用什么 CSS 规则？问题的最小再现将非常有用。 - fwiw - 1 没有在grinderschool.com/mikemarks/1.shtml AFAICT (firebug) 上获得当前课程
当你使用 jQuery 时，我添加了一个使用 jQuery 的解决方案。

标签： javascript jquery css

【解决方案1】：

试试这个调整...

    <script type="text/javascript">

        function change(id, newClass) {
            // using jQuery

            // Remove the "current" class from all elements
            $("."+newClass).removeClass(newClass);

            // Add the "current" class to the selected item
            $("#"+id).addClass(newClass);
        }

        window.onload = function () {
            switch (window.location.href) {
                case "http://www.grinderschool.com/mikemarks/1.shtml":
                    change('features', 'current');
                    change('videos', '');
                    break;
                case "http://www.grinderschool.com/mikemarks/2.shtml":
        change('features', '');
                    change('videos', 'current');
                    break;

            }
        }
    </script>

【讨论】：