刷新后保持折叠状态
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【中文标题】刷新后保持折叠状态【英文标题】:Maintain colllapse-state after refresh 【发布时间】:2020-03-13 15:02:58 【问题描述】:在我的侧边栏中,我添加了一个折叠按钮来显示/隐藏表单。现在我想在刷新页面时保持折叠状态: 如果表单在刷新页面之前未折叠,则刷新后必须保持这种状态。
我认为我需要在 javascript 中使用 localStorage,但我实际上不知道如何使用它。
这是我的 html:
<!-- Sidebar -->
<ul class="sidebar navbar-nav">
<li class="nav-item active">
<a class="nav-link" data-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
<i class="fa fa-filter"></i>
<span>Search Filter</span>
</a>
</li>
</ul>
<!-- Form -->
<div class="collapse" id="collapseExample">
<form>
......
</form>
我只找到了一些代码,但它似乎对我不起作用..:
var shown = []
// On collapse
shown.remove($(this).attr('id'));
localStorage.setItem('shown', shown);
// On open
shown.push($(this).attr('id'));
localStorage.setItem('shown', shown);
// On page load
var shown = localStorage.getItem('shown');
for (var s in shown)
$('#collapseExample' + s).show();
感谢您的帮助!
【问题讨论】:
【参考方案1】:这是一个有效的 Bootstrap 4 折叠示例。与起始模板的主要区别在于,我将 jQuery 导入移至文件顶部,以便可以使用 document.load 函数。我已将 cmets 添加到代码中,但如果仍有不清楚的地方,请继续提问。请注意,我为历史 cmets 留下了 vanilla javascript 答案,以防它也对您有所帮助。
我从这里使用了起始页: https://getbootstrap.com/docs/4.0/getting-started/introduction/
这里的第一个折叠示例: https://getbootstrap.com/docs/4.0/components/collapse/
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8" />
<meta
name="viewport"
content="width=device-width, initial-scale=1, shrink-to-fit=no"
/>
<!-- Bootstrap CSS -->
<link
rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm"
crossorigin="anonymous"
/>
<title>Hello, world!</title>
<!-- jQuery -->
<script
src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"
></script>
<script>
$(function()
// store a reference to the collapse div so that
// we don't have to keep looking it up in the dom
const collapseExample = $("#collapseExample");
// register a callback function to the collapse div that
// will be called every time the collapse is opened.
collapseExample.on("shown.bs.collapse", function()
// since we know that that this function is called on
// open, we'll set the localStorage value to "show"
localStorage.setItem("collapseExample", "show");
);
// register a callback function to the collapse div that
// will be called every time the collapse is closed.
collapseExample.on("hidden.bs.collapse", function()
// since we know that that this function is called on
// open, we'll set the localStorage value to "hide"
localStorage.setItem("collapseExample", "hide");
);
// Since this function runs on page load (meaning only once), we can
// check the value of localStorage from here and then call the
// bootstrap collapse methods ourselves:
// Check the value of the localStorage item
const showExampleCollapse = localStorage.getItem("collapseExample");
// Manipulate the collapse based on the value of the localStorage item.
// Note that the value is determined by lines 36 or 44. If you change those,
// then make sure to check that the comparison on the next line is still valid.
if (showExampleCollapse === "show")
collapseExample.collapse("show");
else
collapseExample.collapse("hide");
);
</script>
</head>
<body>
<main>
<p>
<a
class="btn btn-primary"
data-toggle="collapse"
href="#collapseExample"
role="button"
aria-expanded="false"
aria-controls="collapseExample"
>
Link with href
</a>
<button
class="btn btn-primary"
type="button"
data-toggle="collapse"
data-target="#collapseExample"
aria-expanded="false"
aria-controls="collapseExample"
>
Button with data-target
</button>
</p>
<div class="collapse" id="collapseExample">
<div class="card card-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus
terry richardson ad squid. Nihil anim keffiyeh helvetica, craft beer
labore wes anderson cred nesciunt sapiente ea proident.
</div>
</div>
</main>
<!-- Optional JavaScript -->
<!-- Popper.js, then Bootstrap JS -->
<script
src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"
></script>
<script
src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"
></script>
</body>
</html>
结束引导回答
开始香草 JAVASCRIPT 答案
这是您似乎正在尝试做的一个基本的、独立的版本。它不漂亮,但希望它很清楚。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script>
function getCollapsed()
const state = localStorage.getItem('collapsed');
if(state === 'collapsed')
return true;
return false;
function getStatus()
const resultDiv = document.getElementById('result');
const isCollapsed = getCollapsed();
if(isCollapsed)
resultDiv.innerHTML = "collapsed";
else
resultDiv.innerHTML = "un-collapsed";
function toggleCollapse()
const isCollapsed = getCollapsed();
if(isCollapsed)
localStorage.setItem('collapsed', 'un-collapsed');
else
localStorage.setItem('collapsed', 'collapsed');
getStatus();
</script>
</head>
<body onload="getStatus()">
<div>
<button onclick="toggleCollapse()">Toggle Collapse</button>
</div>
<div id="result"></div>
</body>
</html>
【讨论】:
由于您似乎正在使用引导程序,我将在几分钟后使用引导程序折叠示例对其进行更新。 非常感谢!我将您的代码包含在我的代码中,仅将 id 从“result”调整为“collapseExample”。提交表单时知道使用 onclick="toggleCollapse()" 函数。但它仍然不起作用......你知道出了什么问题吗?非常感谢!!!! @alipfi:我将使用 bootstrap 4 中的默认启动器及其第一个折叠组件示例来编辑此答案。这个应该有更多帮助。我将把第一个留在帖子底部,但它们实际上是 2 个不同的答案。 您能帮我解决我的第二期问题吗? ***.com/questions/58876694/… 刷新页面时,我试图保存表单的复选框状态。我还没有找到合适的解决方案...提前感谢 @alipfi:当你有机会了解它为什么起作用时,请确保你花一些时间。然后你也可以帮助别人。以上是关于刷新后保持折叠状态的主要内容,如果未能解决你的问题,请参考以下文章
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