MediaWiki:Common.js: Difference between revisions

Revision as of 03:45, 23 June 2010

/* 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);
    };
})();

/** Collapsible tables *********************************************************
 *
 * From English Wikipedia, 2008-09-15
 *
 *  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 );