[英]Does include or require refresh a page? Help on changing .active in nav-bar echoed by PHP
我有一个关于include的问题,关于require_once something.php
是否触发刷新? 似乎每个新的require
调用都会触发刷新。
实际上,我的实际问题有所不同,但它使我注意到了上述问题。 像我这样的初学者请多多包涵。
在Bootstrap 5 导航栏上,导航项有一个.active
以使其脱颖而出。 我想将.active
移动到点击的相关导航项并在 codepen 上尝试过。 该脚本工作正常,但在我的玩具网站上使用它时不起作用,其中导航栏 html 代码由 php 回显,具体取决于$isLoggedIn == true || false
$isLoggedIn == true || false
。
索引页由 header.php(导航栏所在)和 requestsPage.php(包括被请求的任何页面)组成。
当单击页眉上的页面时,会生成index.php?reqPage=SomePage
并通过require_once __DIR__."/pages/$reqPage.php";
包含在 index.php 中require_once __DIR__."/pages/$reqPage.php";
,从而重新加载页面(包括header.php文件),所以这些导航栏项目进行重新启动.active
在首页,而不是单击的项目。 每当我点击导航项目时,警报链接就会点击! 是先显示后加载文件! ,提示.active
已更改,然后重新加载导航栏。
请评论和/或建议如何使.active
工作。 我是 php 和后端的新手。
档案
index.php
header.php
js/header.js
pages/page1.php
pages/page2.php
pages/page3.php...
头文件
<html>
<head>
<!--bootstrap and jquery CDNs are here-->
<script src="js/header.js"></script> //for changing .active in nav-item
</head>
<body>
<?php //use php to echo out the nav-bar
if ($isLoggedIn) { //show bootstrap nav-bar for a logged-in user
echo "
<nav class='navbar navbar-expand-lg navbar-dark bg-primary'>
<div class='container'>
<a class='navbar-brand' href='#'>Trump</a>
<button class='navbar-toggler' type='button' data-bs-toggle='collapse' data-bs-target='#loggedInMenus'>
<span class='navbar-toggler-icon'></span>
</button>
<div class='collapse navbar-collapse' id='loggedInMenus'>
<ul class='navbar-nav'>
<li class='nav-item'>
<a class='nav-link active' href='index.php?reqPage=page1'>Home</a>
</li>
<li class='nav-item'>
<a class='nav-link' href='index.php?reqPage=page2'>Lions</a>
</li>
<li class='nav-item'>
<a class='nav-link' href='index.php?reqPage=page3'>Tigers</a>
</li>
</ul></div></div></nav>
";
} else { //show nav-bar for an unlogged-in visitor
echo "
<nav class='navbar navbar-expand-lg navbar-dark bg-primary'>
<div class='container'>
<a class='navbar-brand' href='#'>Trump</a>
<button class='navbar-toggler' type='button' data-bs-toggle='collapse' data-bs-target='#unloggedInMenus'>
<span class='navbar-toggler-icon'></span>
</button>
<div class='collapse navbar-collapse' id='unloggedInMenus'>
<ul class='navbar-nav'>
<li class='nav-item'>
<a class='nav-link active' href='page1.php'>Home</a>
</li>
<li class='nav-item'>
<a class='nav-link' href='index.php?reqPage=page4'>Dogs</a>
</li>
<li class='nav-item'>
<a class='nav-link' href='index.php?reqPage=page5'>Cats</a>
</li>
</ul></div></div></nav>
";
}
?>
索引.php
<?php
require_once __DIR__."/init.php"; //this contains $isLoggedIn
require_once __DIR__."/header.php"; //load the menus
$reqPage = isset($_REQUEST["reqPage"]) ? $_REQUEST["reqPage"] : null;
require_once __DIR__."/pages/$reqPage.php"; //load the requested page
头文件.js
$(document).ready(function(){
alert("document loaded!");
$(".nav-link").on("click", function() {
alert("Link clicked!");
$(".navbar-nav").find(".active").removeClass("active");
$(this).addClass("active");
}
);
});
这种方法纯粹使用 PHP 来实现在正确链接上设置“活动”类的目标。 我不知道你的网站是否是数据库驱动的,但为了简单起见,我使用一个数组来存储你的页面
<body>
<?php
// DON'T use php to echo out the nav-bar. Instead just close the PHP tag
$pagesArray = array('page1' => 'Home',
'page2' => 'title2',
'page3' => 'title3',
'page4' => 'Dogs',
'page5' => 'Cats');
if ($isLoggedIn) {
//show bootstrap nav-bar for a logged-in user
?>
<nav class='navbar navbar-expand-lg navbar-dark bg-primary'>
<div class='container'>
<a class='navbar-brand' href='#'>Trump</a>
<button class='navbar-toggler' type='button' data-bs-toggle='collapse' data-bs-target='#loggedInMenus'>
<span class='navbar-toggler-icon'></span>
</button>
<div class='collapse navbar-collapse' id='loggedInMenus'>
<ul class='navbar-nav'>
<?php
// Open PHP tag again
foreach($pagesArray AS $key => $value){
// Loop through your pages array (or sql loop, etc)
$active = "";
if ( stripos($reqPage, $key) !== FALSE) {
// if $key (page name) matches $reqPage make this link active
// if no match, $active remains empty, so when it is echo'ed,
// there is no class printed on the page for that anchor tag
$active = "class='active'";
}
echo "<li class='nav-item'>
<a class='nav-link' ".$active." href='index.php?reqPage=".$key."'>".$value."'</a>
</li>";
} // END while loop
// close PHP tag again
?>
</ul></div></div></nav>
<?php
} // END if logged in
?>
</body>
鉴于我的代码组织,其中导航栏位于header.php
并包含在index.php
,并且请求的页面变量$reqPage
仅驻留在index.php
,我无法在header.php
测试 $reqPage = $page 来识别选定的回显每个导航项之前的页面。
$page
在回显每个导航项之前存在于header.php
index.php
index.php
$reqPage
$page
和$reqPage
在不同的时间存在于不同的地方,并且不能在 echo out 之前进行测试,所以测试是否相等然后将.active
添加到 echo 中是行不通的相反,我回显了header.php
的导航栏,只识别请求的页面,然后使用 JS 在index.php
添加.active
。
头文件
<nav class='navbar bg-primary'>
<div class='container'>
<a class='navbar-brand' href='#'>Trump</a>
<button class='navbar-toggler' type='button' data-bs-toggle='collapse' data-bs-target='#menus'>
<span class='navbar-toggler-icon'></span>
</button>
<div class='collapse navbar-collapse' id='menus'>
<ul class='navbar-nav'>
<?php //php to dynamically echo out each navbar menu dependent on login
//array to contain nav-items for logged-in / unlogged-in users
$loggedInMenu = ["Home" => "home", "Lions" => "lions", "Tigers" => "tigers", "Log Out" => "logout"];
$unloggedInMenu = ["Home" => null, "Log In" => "login", "Sign Up" => "signup"];
//produce either Logged-in menus or Unlogged-in menus
if ($isLoggedIn) {
produceNavMenu($loggedInMenu);
} else {
produceNavMenu($unloggedInMenu);
}
//helper function to echo out the nav-menu by nav-items one by one
//@param $menu must be associative array having Title => reqPage
function produceNavMenu(array $menu) {
foreach($menu as $title => $page) {
echo "<li class='nav-item'>
<a class='nav-link' id='$page' href='index.php?reqPage=$page'>$title</a>
</li>";
}
}
?>
</ul></div></div></nav><!--end of navbar-->
索引.php
<?php
require_once __DIR__."/init.php"; //this contains $isLoggedIn
require_once __DIR__."/header.php"; //load the menus
$reqPage = isset($_REQUEST["reqPage"]) ? $_REQUEST["reqPage"] : null;
require_once __DIR__."/pages/$reqPage.php"; //load the requested page
?>
<script> //js to add .active to the relevant nav-item
$(document).ready( function() {
var reqPage = "<?php echo "$reqPage"; ?>"; //php var to js var
var activeID = "#"+reqPage; //html id
$(activeID).addClass("active"); //add .active to the requested page
});
</script>
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