tablesorter/js/widgets/widget-stickyHeaders.js

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2015-03-05 16:04:59 +00:00
/*! Widget: stickyHeaders - updated 3/5/2015 (v2.21.0) *//*
* Requires tablesorter v2.8+ and jQuery 1.4.3+
* by Rob Garrison
*/
;(function ($, window) {
'use strict';
var ts = $.tablesorter = $.tablesorter || {};
$.extend(ts.css, {
sticky : 'tablesorter-stickyHeader', // stickyHeader
stickyVis : 'tablesorter-sticky-visible',
stickyHide: 'tablesorter-sticky-hidden',
stickyWrap: 'tablesorter-sticky-wrapper'
});
// Add a resize event to table headers
ts.addHeaderResizeEvent = function(table, disable, settings) {
table = $(table)[0]; // make sure we're using a dom element
var headers,
defaults = {
timer : 250
},
options = $.extend({}, defaults, settings),
c = table.config,
wo = c.widgetOptions,
checkSizes = function(triggerEvent) {
wo.resize_flag = true;
headers = [];
c.$headers.each(function() {
var $header = $(this),
sizes = $header.data('savedSizes') || [0,0], // fixes #394
width = this.offsetWidth,
height = this.offsetHeight;
if (width !== sizes[0] || height !== sizes[1]) {
$header.data('savedSizes', [ width, height ]);
headers.push(this);
}
});
if (headers.length && triggerEvent !== false) {
c.$table.trigger('resize', [ headers ]);
}
wo.resize_flag = false;
};
checkSizes(false);
clearInterval(wo.resize_timer);
if (disable) {
wo.resize_flag = false;
return false;
}
wo.resize_timer = setInterval(function() {
if (wo.resize_flag) { return; }
checkSizes();
}, options.timer);
};
// Sticky headers based on this awesome article:
// http://css-tricks.com/13465-persistent-headers/
// and https://github.com/jmosbech/StickyTableHeaders by Jonas Mosbech
// **************************
ts.addWidget({
id: "stickyHeaders",
priority: 60, // sticky widget must be initialized after the filter widget!
options: {
stickyHeaders : '', // extra class name added to the sticky header row
stickyHeaders_attachTo : null, // jQuery selector or object to attach sticky header to
stickyHeaders_xScroll : null, // jQuery selector or object to monitor horizontal scroll position (defaults: xScroll > attachTo > window)
stickyHeaders_yScroll : null, // jQuery selector or object to monitor vertical scroll position (defaults: yScroll > attachTo > window)
stickyHeaders_offset : 0, // number or jquery selector targeting the position:fixed element
stickyHeaders_filteredToTop: true, // scroll table top into view after filtering
stickyHeaders_cloneId : '-sticky', // added to table ID, if it exists
stickyHeaders_addResizeEvent : true, // trigger "resize" event on headers
stickyHeaders_includeCaption : true, // if false and a caption exist, it won't be included in the sticky header
stickyHeaders_zIndex : 2 // The zIndex of the stickyHeaders, allows the user to adjust this to their needs
},
format: function(table, c, wo) {
// filter widget doesn't initialize on an empty table. Fixes #449
if ( c.$table.hasClass('hasStickyHeaders') || ($.inArray('filter', c.widgets) >= 0 && !c.$table.hasClass('hasFilters')) ) {
return;
}
var $table = c.$table,
// add position: relative to attach element, hopefully it won't cause trouble.
$attach = $(wo.stickyHeaders_attachTo),
namespace = c.namespace + 'stickyheaders ',
// element to watch for the scroll event
$yScroll = $(wo.stickyHeaders_yScroll || wo.stickyHeaders_attachTo || window),
$xScroll = $(wo.stickyHeaders_xScroll || wo.stickyHeaders_attachTo || window),
$thead = $table.children('thead:first'),
$header = $thead.children('tr').not('.sticky-false').children(),
$tfoot = $table.children('tfoot'),
$stickyOffset = isNaN(wo.stickyHeaders_offset) ? $(wo.stickyHeaders_offset) : '',
stickyOffset = $stickyOffset.length ? $stickyOffset.height() || 0 : parseInt(wo.stickyHeaders_offset, 10) || 0,
// is this table nested? If so, find parent sticky header wrapper (div, not table)
$nestedSticky = $table.parent().closest('.' + ts.css.table).hasClass('hasStickyHeaders') ?
$table.parent().closest('table.tablesorter')[0].config.widgetOptions.$sticky.parent() : [],
nestedStickyTop = $nestedSticky.length ? $nestedSticky.height() : 0,
// clone table, then wrap to make sticky header
$stickyTable = wo.$sticky = $table.clone()
.addClass('containsStickyHeaders ' + ts.css.sticky + ' ' + wo.stickyHeaders)
.wrap('<div class="' + ts.css.stickyWrap + '">'),
$stickyWrap = $stickyTable.parent()
.addClass(ts.css.stickyHide)
.css({
position : $attach.length ? 'absolute' : 'fixed',
padding : parseInt( $stickyTable.parent().parent().css('padding-left'), 10 ),
top : stickyOffset + nestedStickyTop,
left : 0,
visibility : 'hidden',
zIndex : wo.stickyHeaders_zIndex || 2
}),
$stickyThead = $stickyTable.children('thead:first'),
$stickyCells,
laststate = '',
spacing = 0,
setWidth = function($orig, $clone){
$orig.filter(':visible').each(function(i) {
var width, border,
$cell = $clone.filter(':visible').eq(i),
$this = $(this);
// code from https://github.com/jmosbech/StickyTableHeaders
if ($this.css('box-sizing') === 'border-box') {
width = $this.outerWidth();
} else {
if ($cell.css('border-collapse') === 'collapse') {
if (window.getComputedStyle) {
width = parseFloat( window.getComputedStyle(this, null).width );
} else {
// ie8 only
border = parseFloat( $this.css('border-width') );
width = $this.outerWidth() - parseFloat( $this.css('padding-left') ) - parseFloat( $this.css('padding-right') ) - border;
}
} else {
width = $this.width();
}
}
$cell.css({
'min-width': width,
'max-width': width
});
});
},
resizeHeader = function() {
stickyOffset = $stickyOffset.length ? $stickyOffset.height() || 0 : parseInt(wo.stickyHeaders_offset, 10) || 0;
spacing = 0;
$stickyWrap.css({
left : $attach.length ? parseInt($attach.css('padding-left'), 10) || 0 :
$table.offset().left - parseInt($table.css('margin-left'), 10) - $xScroll.scrollLeft() - spacing,
width: $table.outerWidth()
});
setWidth( $table, $stickyTable );
setWidth( $header, $stickyCells );
};
// only add a position relative if a position isn't already defined
if ($attach.length && !$attach.css('position')) {
$attach.css('position', 'relative');
}
// save stickyTable element to config
// it is also saved to wo.$sticky
if (c.$extraTables && c.$extraTables.length) {
c.$extraTables.add($stickyTable);
} else {
c.$extraTables = $stickyTable;
}
// fix clone ID, if it exists - fixes #271
if ($stickyTable.attr('id')) { $stickyTable[0].id += wo.stickyHeaders_cloneId; }
// clear out cloned table, except for sticky header
// include caption & filter row (fixes #126 & #249) - don't remove cells to get correct cell indexing
$stickyTable.find('thead:gt(0), tr.sticky-false').hide();
$stickyTable.find('tbody, tfoot').remove();
$stickyTable.find('caption').toggle(wo.stickyHeaders_includeCaption);
// issue #172 - find td/th in sticky header
$stickyCells = $stickyThead.children().children();
$stickyTable.css({ height:0, width:0, margin: 0 });
// remove resizable block
$stickyCells.find('.' + ts.css.resizer).remove();
// update sticky header class names to match real header after sorting
$table
.addClass('hasStickyHeaders')
.bind('pagerComplete' + namespace, function() {
resizeHeader();
});
ts.bindEvents(table, $stickyThead.children().children('.' + ts.css.header));
// add stickyheaders AFTER the table. If the table is selected by ID, the original one (first) will be returned.
$table.after( $stickyWrap );
// onRenderHeader is defined, we need to do something about it (fixes #641)
if (c.onRenderHeader) {
$stickyThead.children('tr').children().each(function(index){
// send second parameter
c.onRenderHeader.apply( $(this), [ index, c, $stickyTable ] );
});
}
// make it sticky!
$xScroll.add($yScroll)
.unbind( ('scroll resize '.split(' ').join( namespace )).replace(/\s+/g, ' ') )
.bind('scroll resize '.split(' ').join( namespace ), function(event) {
if (!$table.is(':visible')) { return; } // fixes #278
// Detect nested tables - fixes #724
nestedStickyTop = $nestedSticky.length ? $nestedSticky.offset().top - $yScroll.scrollTop() + $nestedSticky.height() : 0;
var offset = $table.offset(),
yWindow = $.isWindow( $yScroll[0] ), // $.isWindow needs jQuery 1.4.3
xWindow = $.isWindow( $xScroll[0] ),
// scrollTop = ( $attach.length ? $attach.offset().top : $yScroll.scrollTop() ) + stickyOffset + nestedStickyTop,
scrollTop = ( $attach.length ? ( yWindow ? $yScroll.scrollTop() : $yScroll.offset().top ) : $yScroll.scrollTop() ) + stickyOffset + nestedStickyTop,
tableHeight = $table.height() - ($stickyWrap.height() + ($tfoot.height() || 0)),
isVisible = ( scrollTop > offset.top ) && ( scrollTop < offset.top + tableHeight ) ? 'visible' : 'hidden',
cssSettings = { visibility : isVisible };
if ($attach.length) {
cssSettings.top = yWindow ? scrollTop - $attach.offset().top : $attach.scrollTop();
}
if (xWindow) {
// adjust when scrolling horizontally - fixes issue #143
cssSettings.left = $table.offset().left - parseInt($table.css('margin-left'), 10) - $xScroll.scrollLeft() - spacing;
}
if ($nestedSticky.length) {
cssSettings.top = ( cssSettings.top || 0 ) + stickyOffset + nestedStickyTop;
}
$stickyWrap
.removeClass( ts.css.stickyVis + ' ' + ts.css.stickyHide )
.addClass( isVisible === 'visible' ? ts.css.stickyVis : ts.css.stickyHide )
.css(cssSettings);
if (isVisible !== laststate || event.type === 'resize') {
// make sure the column widths match
resizeHeader();
laststate = isVisible;
}
});
if (wo.stickyHeaders_addResizeEvent) {
ts.addHeaderResizeEvent(table);
}
// look for filter widget
if ($table.hasClass('hasFilters') && wo.filter_columnFilters) {
// scroll table into view after filtering, if sticky header is active - #482
$table.bind('filterEnd' + namespace, function() {
// $(':focus') needs jQuery 1.6+
var $td = $(document.activeElement).closest('td'),
column = $td.parent().children().index($td);
// only scroll if sticky header is active
if ($stickyWrap.hasClass(ts.css.stickyVis) && wo.stickyHeaders_filteredToTop) {
// scroll to original table (not sticky clone)
window.scrollTo(0, $table.position().top);
// give same input/select focus; check if c.$filters exists; fixes #594
if (column >= 0 && c.$filters) {
c.$filters.eq(column).find('a, select, input').filter(':visible').focus();
}
}
});
ts.filter.bindSearch( $table, $stickyCells.find('.' + ts.css.filter) );
// support hideFilters
if (wo.filter_hideFilters) {
ts.filter.hideFilters($stickyTable, c);
}
}
$table.trigger('stickyHeadersInit');
},
remove: function(table, c, wo) {
var namespace = c.namespace + 'stickyheaders ';
c.$table
.removeClass('hasStickyHeaders')
.unbind( ('pagerComplete filterEnd '.split(' ').join(namespace)).replace(/\s+/g, ' ') )
.next('.' + ts.css.stickyWrap).remove();
if (wo.$sticky && wo.$sticky.length) { wo.$sticky.remove(); } // remove cloned table
$(window)
.add(wo.stickyHeaders_xScroll)
.add(wo.stickyHeaders_yScroll)
.add(wo.stickyHeaders_attachTo)
.unbind( ('scroll resize '.split(' ').join(namespace)).replace(/\s+/g, ' ') );
ts.addHeaderResizeEvent(table, false);
}
});
})(jQuery, window);