How to change css of tag from an outside link

Question

I have a menu in a tag called sf-menu.

I need the visibility to change to none when the link is clicked and toggled back when clicked again.

Can I achieve this with CSS only or do I need JavaScript?

Hoping someone can help me with an example.

.sf-menu {visibility: visible}
<a class="closed" href="#sidewidgetarea"> Switch</a>

Answer 1

1. You can use input type='checkbox' for it :

http://jsfiddle.net/gSPqX/1/

<input type="checkbox" style="display: none" id="cb">
<label for="cb">Click Here</label>
<div>
    Hello. This is some stuff.
</div>

2. One more better solution using :target

#menu .menu{
   display:none; 
}
#menu:target  .menu{
    display: block;
}

#menu:target .menu__open{
    display: none;
}
#menu .menu__close{
    display: none;
}
#menu:target .menu__close{
    display: block;
}

<div id="menu">
    <a href="#menu" class="menu__open">Open menu</a>
    <a href="#" class="menu__close">Close menu</a>
    <div class="menu">
        Hello. This is some stuff.
    </div>
</div>

Answer 2

If you are using jquery, you can use jquery.toggle()

Example:

$(".closed").click(function(event) {
    event.stopPropagation()
    $(".sf-menu").toggle();
});

Source: https://api.jquery.com/toggle/

Answer 3

You can do it using only CSS. The trick is to leave a trail that could be clicked and work as a switch/button for turning display on or off. You can accomplish that by wrapping your content needed to be toggled into some div or any other element suitable to you.

Here is a little example for that.

label {
  cursor: pointer;
}
#menu-toggle {
  display: none; /* hide the checkbox */
}
#menu {
  display: none;
}
#menu-toggle:checked + #menu {
  display: block;
}

<label for="menu-toggle">Click me to toggle menu</label>
<input type="checkbox" id="menu-toggle"/>
<ul id="menu">
  <li><a href="#">First link</a></li>
  <li><a href="#">Second link</a></li>
  <li><a href="#">Third link</a></li>
</ul>

Answer 4

Here is a super simple solution in jQuery, using the tags you have mentioned. But first remove your CSS-row!

Please not that this example doesnät seem to execute on stackoverflow.com but works fine on jsfiddle.net.

$('.closed').click(function(){
    $('.sf-menu').toggle();
});

<a class="closed" href="#sidewidgetarea">Switch</a>
<div class="sf-menu">The menu</div>

Answer 5

In HTML :

<h1 class="sf-menu"> TestText </h1>

JavaScript :

 var sfmenu = document.getElementsByClassName("sf-menu");
sfmenu[0].onclick = function () {
    if (this.style.display == 'none' ) {
        this.style.display = '';
    } else {
        this.style.display = 'none';
    }
};

Answer 6

If you're able to edit the DOM, there is a PureCSS solution (see below), but I think that the best solution is using Javascript, jQuery offers you a crossbrowser solution!

Hope Helps!!

var HIDDEN_CLASS = 'sf-menu-hidden';


/** jQuery **/
jQuery(document).ready(function($) {
  $('#jQueryTest .closed').click(function closeWithJQuery(event) {
    event.preventDefault();
    $('#jQueryTest .sf-menu').toggleClass(HIDDEN_CLASS);
  });
});


/** VanillaJS **/
document.addEventListener("DOMContentLoaded", function(event) {
  document
  .querySelector('#VanillaJSTest .closed')
  .addEventListener('click', function() {
    var el = document.querySelector('#VanillaJSTest .sf-menu');
    var task = el.classList.contains(HIDDEN_CLASS) ? 'remove' : 'add';
    
    el.classList[task](HIDDEN_CLASS);
  });
});

* {
  -webkit-user-select: none;
  user-select: none;
}

.sf-menu-hidden {
  visibility: hidden;
}

a, label {
  cursor: pointer;
}

article + article {
  margin-top: 10px;
  border-top: 1px solid green;
}

#PureCSSTest [type="checkbox"] {
  display: none;
}

#PureCSSTest [type="checkbox"]:checked + .sf-menu {
  visibility: hidden;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<article id="jQueryTest">
  <h1>Test jQuery</h1>
  <a class="closed">TOGGLE MENù</a>
  <div class="sf-menu">
    <ul>
      <li> Hey I Am On THE SCREEN</li>
    </ul>
  </div>
</article>


<article id="VanillaJSTest">
  <h1>VanillaJS</h1>
  <a class="closed">TOGGLE MENù</a>
  <div class="sf-menu">
    <ul>
      <li> Hey I Am On THE SCREEN</li>
    </ul>
  </div>
</article>


<article id="PureCSSTest">
  <h1>PURE CSS</h1>
  <a class="closed"><label for="toggleClosed">TOGGLE MENù</label></a>
  <input type="checkbox" id="toggleClosed">
  <div class="sf-menu">
    <ul>
      <li> Hey I Am On THE SCREEN</li>
    </ul>
  </div>
</article>