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From 2012.igem.org

/** Collapsible tables *********************************************************

*
*  Description: Allows tables to be collapsed, showing only the header. See
*                         http://www.mediawiki.org/wiki/Manual:Collapsible_tables.
*  Maintainers: en: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.className = 'collapseButton'; // Styles are declared in MediaWiki:Common.css

                       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 );
               } else if ( hasClass( NavigationBoxes[i], 'innercollapse' ) ) {
                       var element = NavigationBoxes[i];
                       while ( element = element.parentNode ) {
                               if ( hasClass( element, 'outercollapse' ) ) {
                                       collapseTable( i );
                                       break;
                               }
                       }
               }
       }

}

addOnloadHook( createCollapseButtons );

/** 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 );
       };

})();