在点击菜单栏上更改字体真棒图标
[英]Change font awesome icon on click menu bars
问题描述
https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_topnav
响应式视图菜单显示时，我想将fa-bars图标更改为fa-plus。 请帮我。 提前致谢。
检查以下代码段
function myFunction() { var x = document.getElementById("myTopnav"); if (x.className === "topnav") { x.className += " responsive"; } else { x.className = "topnav"; } }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; } .topnav { overflow: hidden; background-color: #333; } .topnav a { float: left; display: block; color: #f2f2f2; text-align: center; padding: 14px 16px; text-decoration: none; font-size: 17px; } .topnav a:hover { background-color: #ddd; color: black; } .active { background-color: #4CAF50; color: white; } .topnav .icon { display: none; } @media screen and (max-width: 600px) { .topnav a:not(:first-child) {display: none;} .topnav a.icon { float: right; display: block; } } @media screen and (max-width: 600px) { .topnav.responsive {position: relative;} .topnav.responsive .icon { position: absolute; right: 0; top: 0; } .topnav.responsive a { float: none; display: block; text-align: left; } }
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> </head> <body> <div class="topnav" id="myTopnav"> <a href="#home" class="active">Home</a> <a href="#news">News</a> <a href="#contact">Contact</a> <a href="#about">About</a> <a href="javascript:void(0);" class="icon" onclick="myFunction()"> <i class="fa fa-bars"></i> </a> </div> <div style="padding-left:16px"> <h2>Responsive Topnav Example</h2> <p>Resize the browser window to see how it works.</p> </div> </body> </html>
2 个解决方案
解决方案1
2 2018-05-17 05:17:38
相反， fa-bars在i标签中设置了fa-plus
<i class="fa fa-plus"></i>
你会在小屏幕上看到它
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> <style> body { margin: 0; font-family: Arial, Helvetica, sans-serif; } .topnav { overflow: hidden; background-color: #333; } .topnav a { float: left; display: block; color: #f2f2f2; text-align: center; padding: 14px 16px; text-decoration: none; font-size: 17px; } .topnav a:hover { background-color: #ddd; color: black; } .active { background-color: #4CAF50; color: white; } .topnav .icon { display: none; } @media screen and (max-width: 600px) { .topnav a:not(:first-child) {display: none;} .topnav a.icon { float: right; display: block; } } @media screen and (max-width: 600px) { .topnav.responsive {position: relative;} .topnav.responsive .icon { position: absolute; right: 0; top: 0; } .topnav.responsive a { float: none; display: block; text-align: left; } } </style> </head> <body> <div class="topnav" id="myTopnav"> <a href="#home" class="active">Home</a> <a href="#news">News</a> <a href="#contact">Contact</a> <a href="#about">About</a> <a href="javascript:void(0);" class="icon" onclick="myFunction()"> <i class="fa fa-plus"></i> </a> </div> <div style="padding-left:16px"> <h2>Responsive Topnav Example</h2> <p>Resize the browser window to see how it works.</p> </div> <script> function myFunction() { var x = document.getElementById("myTopnav"); if (x.className === "topnav") { x.className += " responsive"; } else { x.className = "topnav"; } } </script> </body> </html>
编辑您的评论：
单击“条”时，条变为fa-plus，表示将fa-bars切换为fa-plus
function myFunction() { var x = document.getElementById("myTopnav"); if (x.className === "topnav") { x.className += " responsive"; } else { x.className = "topnav"; } var icon=document.getElementsByClassName("fa-bars")[0]; if(icon){ icon.className = icon.className.replace("fa-bars", "fa-plus"); } else{ icon=document.getElementsByClassName("fa-plus")[0]; icon.className = icon.className.replace("fa-plus", "fa-bars"); } }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; } .topnav { overflow: hidden; background-color: #333; } .topnav a { float: left; display: block; color: #f2f2f2; text-align: center; padding: 14px 16px; text-decoration: none; font-size: 17px; } .topnav a:hover { background-color: #ddd; color: black; } .active { background-color: #4CAF50; color: white; } .topnav .icon { display: none; } @media screen and (max-width: 600px) { .topnav a:not(:first-child) {display: none;} .topnav a.icon { float: right; display: block; } } @media screen and (max-width: 600px) { .topnav.responsive {position: relative;} .topnav.responsive .icon { position: absolute; right: 0; top: 0; } .topnav.responsive a { float: none; display: block; text-align: left; } }
<meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> <body> <div class="topnav" id="myTopnav"> <a href="#home" class="active">Home</a> <a href="#news">News</a> <a href="#contact">Contact</a> <a href="#about">About</a> <a href="javascript:void(0);" class="icon" onclick="myFunction()"> <i class="fa fa-bars" id="icon"></i> </a> </div> <div style="padding-left:16px"> <h2>Responsive Topnav Example</h2> <p>Resize the browser window to see how it works.</p> </div> </body>
解决方案2
0 已采纳 2018-05-17 05:54:44
只需在i标签中切换类fa-bars和fa-plus
$(this).find('.fa').removeClass('fa-bars').addClass('fa-plus');
$(this).find('.fa').removeClass('fa-plus').addClass('fa-bars');
我稍微更改了您的html代码。 您正在从html调用js函数。 我更改了我添加的jquery代码，该代码侦听标签的click事件。
检查以下工作片段
$(document).ready(function(){ $("#icon").on("click", function(){ var x = document.getElementById("myTopnav"); if (x.className === "topnav") { x.className += " responsive"; $(this).find('.fa').removeClass('fa-bars').addClass('fa-plus'); } else { x.className = "topnav"; $(this).find('.fa').removeClass('fa-plus').addClass('fa-bars'); } }); });
body { margin: 0; font-family: Arial, Helvetica, sans-serif; } .topnav { overflow: hidden; background-color: #333; } .topnav a { float: left; display: block; color: #f2f2f2; text-align: center; padding: 14px 16px; text-decoration: none; font-size: 17px; } .topnav a:hover { background-color: #ddd; color: black; } .active { background-color: #4CAF50; color: white; } .topnav .icon { display: none; } @media screen and (max-width: 600px) { .topnav a:not(:first-child) {display: none;} .topnav a.icon { float: right; display: block; } } @media screen and (max-width: 600px) { .topnav.responsive {position: relative;} .topnav.responsive .icon { position: absolute; right: 0; top: 0; } .topnav.responsive a { float: none; display: block; text-align: left; } }
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> </head> <body> <div class="topnav" id="myTopnav"> <a href="#home" class="active">Home</a> <a href="#news">News</a> <a href="#contact">Contact</a> <a href="#about">About</a> <a href="javascript:void(0);" class="icon" id="icon"> <i class="fa fa-bars"></i> </a> </div> <div style="padding-left:16px"> <h2>Responsive Topnav Example</h2> <p>Resize the browser window to see how it works.</p> </div> </body> </html>
单击更改“真棒字体”图标
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