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/**
* @author vincent loh <vincent.ml@gmail.com>
* @version: v1.0.0
* https://github.com/vinzloh/bootstrap-table/
* Sticky header for bootstrap-table
*/
(function ($) {
'use strict';
var sprintf = $.fn.bootstrapTable.utils.sprintf;
$.extend($.fn.bootstrapTable.defaults, {
stickyHeader: false
});
var BootstrapTable = $.fn.bootstrapTable.Constructor,
_initHeader = BootstrapTable.prototype.initHeader;
BootstrapTable.prototype.initHeader = function () {
var that = this;
_initHeader.apply(this, Array.prototype.slice.apply(arguments));
if (!this.options.stickyHeader) {
return;
}
var table = this.$tableBody.find('table'),
table_id = table.attr('id'),
header_id = table.attr('id') + '-sticky-header',
sticky_header_container_id = header_id +'-sticky-header-container',
anchor_begin_id = header_id +'_sticky_anchor_begin',
anchor_end_id = header_id +'_sticky_anchor_end';
// add begin and end anchors to track table position
table.before(sprintf('<div id="%s" class="hidden"></div>', sticky_header_container_id));
table.before(sprintf('<div id="%s"></div>', anchor_begin_id));
table.after(sprintf('<div id="%s"></div>', anchor_end_id));
table.find('thead').attr('id', header_id);
// clone header just once, to be used as sticky header
// deep clone header. using source header affects tbody>td width
this.$stickyHeader = $($('#'+header_id).clone(true, true));
// avoid id conflict
this.$stickyHeader.removeAttr('id');
// render sticky on window scroll or resize
$(window).on('resize.'+table_id, table, render_sticky_header);
$(window).on('scroll.'+table_id, table, render_sticky_header);
// render sticky when table scroll left-right
table.closest('.fixed-table-container').find('.fixed-table-body').on('scroll.'+table_id, table, match_position_x);
this.$el.on('all.bs.table', function (e) {
that.$stickyHeader = $($('#'+header_id).clone(true, true));
that.$stickyHeader.removeAttr('id');
});
function render_sticky_header(event) {
var table = event.data;
var table_header_id = table.find('thead').attr('id');
// console.log('render_sticky_header for > '+table_header_id);
if (table.length < 1 || $('#'+table_id).length < 1){
// turn off window listeners
$(window).off('resize.'+table_id);
$(window).off('scroll.'+table_id);
table.closest('.fixed-table-container').find('.fixed-table-body').off('scroll.'+table_id);
return;
}
// get header height
var header_height = '0';
if (that.options.stickyHeaderOffsetY) header_height = that.options.stickyHeaderOffsetY.replace('px','');
// window scroll top
var t = $(window).scrollTop();
// top anchor scroll position, minus header height
var e = $("#"+anchor_begin_id).offset().top - header_height;
// bottom anchor scroll position, minus header height, minus sticky height
var e_end = $("#"+anchor_end_id).offset().top - header_height - $('#'+table_header_id).css('height').replace('px','');
// show sticky when top anchor touches header, and when bottom anchor not exceeded
if (t > e && t <= e_end) {
// ensure clone and source column widths are the same
$.each( that.$stickyHeader.find('tr').eq(0).find('th'), function (index, item) {
$(item).css('min-width', $('#'+table_header_id+' tr').eq(0).find('th').eq(index).css('width'));
});
// match bootstrap table style
$("#"+sticky_header_container_id).removeClass('hidden').addClass("fix-sticky fixed-table-container") ;
// stick it in position
$("#"+sticky_header_container_id).css('top', header_height + 'px');
// create scrollable container for header
var scrollable_div = $('<div style="position:absolute;width:100%;overflow-x:hidden;" />');
// append cloned header to dom
$("#"+sticky_header_container_id).html(scrollable_div.append(that.$stickyHeader));
// match clone and source header positions when left-right scroll
match_position_x(event);
} else {
// hide sticky
$("#"+sticky_header_container_id).removeClass("fix-sticky").addClass('hidden');
}
}
function match_position_x(event){
var table = event.data;
var table_header_id = table.find('thead').attr('id');
// match clone and source header positions when left-right scroll
$("#"+sticky_header_container_id).css(
'width', +table.closest('.fixed-table-body').css('width').replace('px', '') + 1
);
$("#"+sticky_header_container_id+" thead").parent().scrollLeft(Math.abs($('#'+table_header_id).position().left));
}
};
})(jQuery);