代码美化部分————导航栏的active

对于导航栏来说，当选定在某个功能部分时，当前模块会有高亮显示。

查看main-nav.php中有管导航栏的代码

<div class="collapse navbar-collapse" id="navbarSupportedContent">
		<ul class="nav nav-pills main-nav mr-auto">
			<li class="nav-item <?php echo Algo::isPrefix($_SERVER['REQUEST_URI'], '/contest'); ?>"><a class="nav-link" href="<?= HTML::url('/contests') ?>"><span class="glyphicon glyphicon-stats"></span> <?= UOJLocale::get('contests') ?></a></li>
			<li class="nav-item <?php echo Algo::isPrefix($_SERVER['REQUEST_URI'], '/problem'); ?>"><a class="nav-link" href="<?= HTML::url('/problems') ?>"><span class="glyphicon glyphicon-list-alt"></span> <?= UOJLocale::get('problems') ?></a></li>
			<li class="nav-item <?php echo Algo::isPrefix($_SERVER['REQUEST_URI'], '/submission'); ?>"><a class="nav-link" href="<?= HTML::url('/submissions') ?>"><span class="glyphicon glyphicon-tasks"></span> <?= UOJLocale::get('submissions') ?></a></li>
			<li class="nav-item <?php echo Algo::isPrefix($_SERVER['REQUEST_URI'], '/blog'); ?>"><a class="nav-link" href="<?= HTML::blog_list_url() ?>"><span class="glyphicon glyphicon-edit"></span> <?= UOJLocale::get('blogs') ?></a></li>
			<li class="nav-item <?php echo Algo::isPrefix($_SERVER['REQUEST_URI'], '/faq'); ?>"><a class="nav-link" href="<?= HTML::url('/faq') ?>"><span class="glyphicon glyphicon-info-sign"></span> <?= UOJLocale::get('help') ?></a></li>
		</ul>
	</div>

首先，对于高亮部分，使用class = active的标签进行使用。查询当前路由信息的字符串前缀是否和给出的字符串相同。具体代码如下：

class Algo {
    public static function isPrefix($strA, $strB) {
        $prefix = substr($strA, 0, strlen($strB));
        if (strcmp($prefix, $strB) === 0) {
            return 'active';
        } else {
            return '';
        }
    }
}

对于class = active，采用如下css代码去渲染

# 颜色，圆角设置
ul.main-nav>li.active {
    background-color: lightblue;
    border-radius: 10px;
}

# 字体设置
ul.main-nav>li.active>a {
    color: white;
}

ul.main-nav>li>a {
    color: black;
}

form {
    justify-content: space-evenly;
}

注意，该代码存放在hakuro-nav.css文件中，必须在header中放在最后一个去渲染。