Manual:NavFrame

/** Collapsible tables *********************************************************
 *
 *  Description: Allows tables to be collapsed, showing only the header. See
 *               [[Wikipedia:NavFrame]].
 *  Maintainers: [[User:R. Koot]]
 */
 
var autoCollapse = 2;
var collapseCaption = "hide";
var expandCaption = "show";
 
function collapseTable( tableIndex ) {
	var Button = document.getElementById( "collapseButton" + tableIndex );
	var Table = document.getElementById( "collapsibleTable" + tableIndex );
 
	if ( !Table || !Button ) {
		return false;
	}
 
	var Rows = Table.rows;
 
	if ( Button.firstChild.data == collapseCaption ) {
		for ( var i = 1; i < Rows.length; i++ ) {
			Rows[i].style.display = "none";
		}
		Button.firstChild.data = expandCaption;
	} else {
		for ( var i = 1; i < Rows.length; i++ ) {
			Rows[i].style.display = Rows[0].style.display;
		}
		Button.firstChild.data = collapseCaption;
	}
}
 
function createCollapseButtons() {
	var tableIndex = 0;
	var NavigationBoxes = new Object();
	var Tables = document.getElementsByTagName( "table" );
 
	for ( var i = 0; i < Tables.length; i++ ) {
		if ( hasClass( Tables[i], "collapsible" ) ) {
 
			/* only add button and increment count if there is a header row to work with */
			var HeaderRow = Tables[i].getElementsByTagName( "tr" )[0];
			if (!HeaderRow) continue;
			var Header = HeaderRow.getElementsByTagName( "th" )[0];
			if (!Header) continue;
 
			NavigationBoxes[ tableIndex ] = Tables[i];
			Tables[i].setAttribute( "id", "collapsibleTable" + tableIndex );
 
			var Button     = document.createElement( "span" );
			var ButtonLink = document.createElement( "a" );
			var ButtonText = document.createTextNode( collapseCaption );
 
			Button.style.styleFloat = "right";
			Button.style.cssFloat = "right";
			Button.style.fontWeight = "normal";
			Button.style.textAlign = "right";
			Button.style.width = "6em";
 
			ButtonLink.style.color = Header.style.color;
			ButtonLink.setAttribute( "id", "collapseButton" + tableIndex );
			ButtonLink.setAttribute( "href", "javascript:collapseTable(" + tableIndex + ");" );
			ButtonLink.appendChild( ButtonText );
 
			Button.appendChild( document.createTextNode( "[" ) );
			Button.appendChild( ButtonLink );
			Button.appendChild( document.createTextNode( "]" ) );
 
			Header.insertBefore( Button, Header.childNodes[0] );
			tableIndex++;
		}
	}
 
	for ( var i = 0;  i < tableIndex; i++ ) {
		if ( hasClass( NavigationBoxes[i], "collapsed" ) || ( tableIndex >= autoCollapse && hasClass( NavigationBoxes[i], "autocollapse" ) ) ) {
			collapseTable( i );
		}
	}
}
 
addOnloadHook( createCollapseButtons );
 
 /** Dynamic Navigation Bars (experimental) *************************************
  *
  *  Description: See [[Wikipedia:NavFrame]].
  *  Maintainers: UNMAINTAINED
  */
 
// set up the words in your language
var NavigationBarHide = '[' + collapseCaption + ']';
var NavigationBarShow = '[' + expandCaption + ']';
 
// shows and hides content and picture (if available) of navigation bars
// Parameters:
//     indexNavigationBar: the index of navigation bar to be toggled
function toggleNavigationBar(indexNavigationBar) {
	var NavToggle = document.getElementById("NavToggle" + indexNavigationBar);
	var NavFrame = document.getElementById("NavFrame" + indexNavigationBar);
 
	if (!NavFrame || !NavToggle) {
		return false;
	}
 
	// if shown now
	if (NavToggle.firstChild.data == NavigationBarHide) {
		for (
			var NavChild = NavFrame.firstChild;
			NavChild != null;
			NavChild = NavChild.nextSibling
		) {
		if ( hasClass( NavChild, 'NavPic' ) ) {
			NavChild.style.display = 'none';
		}
		if ( hasClass( NavChild, 'NavContent') ) {
			NavChild.style.display = 'none';
		}
	}
	NavToggle.firstChild.data = NavigationBarShow;
 
	// if hidden now
	} else if (NavToggle.firstChild.data == NavigationBarShow) {
	for (
		var NavChild = NavFrame.firstChild;
		NavChild != null;
		NavChild = NavChild.nextSibling
	) {
		if( hasClass(NavChild, 'NavPic') ) {
			NavChild.style.display = 'block';
		}
		if( hasClass(NavChild, 'NavContent') ) {
			NavChild.style.display = 'block';
		}
	}
	NavToggle.firstChild.data = NavigationBarHide;
	}
}
 
// adds show/hide-button to navigation bars
function createNavigationBarToggleButton() {
	var indexNavigationBar = 0;
	// iterate over all < div >-elements 
	var divs = document.getElementsByTagName("div");
	for(
		var i=0; 
		NavFrame = divs[i]; 
		i++
		) {
	// if found a navigation bar
	if( hasClass(NavFrame, "NavFrame") ) {
 
		indexNavigationBar++;
		var NavToggle = document.createElement("a");
		NavToggle.className = 'NavToggle';
		NavToggle.setAttribute('id', 'NavToggle' + indexNavigationBar);
		NavToggle.setAttribute('href', 'javascript:toggleNavigationBar(' + indexNavigationBar + ');');
 
		var NavToggleText = document.createTextNode(NavigationBarHide);
		for (
			var NavChild = NavFrame.firstChild;
			NavChild != null;
			NavChild = NavChild.nextSibling
			) {
		if ( hasClass( NavChild, 'NavPic' ) || hasClass( NavChild, 'NavContent' ) ) {
			if (NavChild.style.display == 'none') {
				NavToggleText = document.createTextNode(NavigationBarShow);
				break;
			}
		}
	}
 
		NavToggle.appendChild(NavToggleText);
		// Find the NavHead and attach the toggle link (Must be this complicated because Moz's firstChild handling is borked)
		for(
			var j=0;
			j < NavFrame.childNodes.length;
			j++
			) {
			if( hasClass(NavFrame.childNodes[j], "NavHead") ) {
				NavFrame.childNodes[j].appendChild(NavToggle);
			}
		}
		NavFrame.setAttribute('id', 'NavFrame' + indexNavigationBar);
		}
	}
}
 
addOnloadHook( createNavigationBarToggleButton );
 
 
/** Test if an element has a certain class **************************************
  *
  * Description: Uses regular expressions and caching for better performance.
  * Maintainers: [[User:Mike Dillon]], [[User:R. Koot]], [[User:SG]]
  */
 
var hasClass = (function () {
	var reCache = {};
	return function (element, className) {
		return (reCache[className] ? reCache[className] : (reCache[className] = new RegExp("(?:\\s|^)" + className + "(?:\\s|$)"))).test(element.className);
	};
})();

/* Standard Navigationsleisten, aka box hiding thingy from .de.  Documentation at [[Wikipedia:NavFrame]]. */
div.Boxmerge,
div.NavFrame {
	margin: 0px;
	padding: 4px;
	border: 1px solid #aaa;
	text-align: center;
	border-collapse: collapse;
	font-size: 95%;
}
div.Boxmerge div.NavFrame {
	border-style: none;
	border-style: hidden;
}
div.NavFrame + div.NavFrame {
	border-top-style: none;
	border-top-style: hidden;
}
div.NavPic {
	background-color: #fff;
	margin: 0px;
	padding: 2px;
	float: left;
}
div.NavFrame div.NavHead {
	height: 1.6em;
	font-weight: bold;
	background-color: #ccf;
	position:relative;
}
div.NavFrame p {
	font-size: 100%;
}
div.NavFrame div.NavContent {
	font-size: 100%;
}
div.NavFrame div.NavContent p {
	font-size: 100%;
}
div.NavEnd {
	margin: 0px;
	padding: 0px;
	line-height: 1px;
	clear: both;
}
a.NavToggle {
	position: absolute;
	top: 0px;
	right: 3px;
	font-weight: normal;
	font-size: smaller;
}

<div class="NavFrame">
  <div class="NavHead">[... This is the title of your collapsible content ...]</div>
  <div class="NavContent">
    [... The content you want to hide goes here ...]
  </div>
</div>

<div class="NavFrame">
  <div class="NavHead">[... This is the title of the hidden content ...]</div>
  <div class="NavContent" style="display:none;">
    [... This content is initially hidden ...]
  </div>
</div>