关闭画布菜单html css

Question

I want to make a off canvas menu like this but I shall push the text out of the screen and not crop. And I want to add a function that close the menu after I clicked out of it.

I got the code from w3school off canvas menu.

 function openNav() { document.getElementById("mySidenav").style.width = "250px"; document.getElementById("main").style.marginLeft = "250px"; } function closeNav() { document.getElementById("mySidenav").style.width = "0"; document.getElementById("main").style.marginLeft= "0"; } 

 body { font-family: "Lato", sans-serif; } .sidenav { height: 100%; width: 0; position: fixed; z-index: 1; top: 0; left: 0; background-color: #111; overflow-x: hidden; transition: 0.5s; padding-top: 60px; } .sidenav a { padding: 8px 8px 8px 32px; text-decoration: none; font-size: 25px; color: #818181; display: block; transition: 0.3s; } .sidenav a:hover, .offcanvas a:focus{ color: #f1f1f1; } .sidenav .closebtn { position: absolute; top: 0; right: 25px; font-size: 36px; margin-left: 50px; } #main { transition: margin-left .5s; padding: 16px; } @media screen and (max-height: 450px) { .sidenav {padding-top: 15px;} .sidenav a {font-size: 18px;} } 

 <div id="mySidenav" class="sidenav"> <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a> <a href="#">About</a> <a href="#">Services</a> <a href="#">Clients</a> <a href="#">Contact</a> </div> <div id="main"> <h2>Sidenav Push Example</h2> <p>Click on the element below to open the side navigation menu, and push this content to the right.</p> <span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span> </div> 

Answer 1

Rather than trying to add / remove CSS rules on the click events - try using a single function that adds / removes a class to achieve the opening / closing.

I create an open class that had the styling that you had in the js - then its just a case of adding / removing the class to allow the sidenav to open / close.

This is not how I would suggest to have it - but keeping it in touch with your original code as much as possible - I wrapped the entire thing in a div with an id of wrapper - and then said that on the click of that div (which contains the side nav and the main panel) that if the wrapper has the open class - then remove it (closing the sidenav) and if not - open it.

You will need to look at what you want to trigger the opening - I assume you don't want any click on the entire pain panel opening the side nave - but this should give you an idea on how to get a click outside of the sidenav to close it.

 function toggleNav() { var wrapper = document.getElementById("wrapper"); if(wrapper.classList.contains("open")){ wrapper.classList.remove("open") } else { wrapper.classList.add("open"); }; } 

 body { font-family: "Lato", sans-serif; } .sidenav { height: 100%; width: 0; position: fixed; z-index: 1; top: 0; left: 0; background-color: #111; overflow-x: hidden; transition: 0.5s; padding-top: 60px; } .open #mySidenav { width:250px; } .open #main { margin-left:250px; } .sidenav a { padding: 8px 8px 8px 32px; text-decoration: none; font-size: 25px; color: #818181; display: block; transition: 0.3s; } .sidenav a:hover, .offcanvas a:focus{ color: #f1f1f1; } .sidenav .closebtn { position: absolute; top: 0; right: 25px; font-size: 36px; margin-left: 50px; } #main { transition: margin-left .5s; padding: 16px; } @media screen and (max-height: 450px) { .sidenav {padding-top: 15px;} .sidenav a {font-size: 18px;} } 

 <div id="wrapper" class="" onclick="toggleNav()"> <div id="mySidenav" class="sidenav"> <a href="javascript:void(0)" class="closebtn">&times;</a> <a href="#">About</a> <a href="#">Services</a> <a href="#">Clients</a> <a href="#">Contact</a> </div> <div id="main"> <h2>Sidenav Push Example</h2> <p>Click on the element below to open the side navigation menu, and push this content to the right.</p> <span style="font-size:30px;cursor:pointer">&#9776; open</span> </div> <div>