/*
* jQuery pager plugin
* Version 1.0 (11/20/2010)
*/
(function($) {
$.fn.pager = function(options) {
var opts = $.extend({}, $.fn.pager.defaults, options);
return this.each(function() {
// empty out the destination element and then render out the pager with the supplied options
$(this).empty().append(renderpager(parseInt(options.pagenumber), parseInt(options.pagecount), options.buttonClickCallback));
// specify correct cursor activity
$('.pages li').mouseover(function() { document.body.style.cursor = "pointer"; }).mouseout(function() { document.body.style.cursor = "auto"; });
});
};
// render and return the pager with the supplied options
function renderpager(pagenumber, pagecount, buttonClickCallback) {
// setup $pager to hold render
var $pager = $('
');
// add in the previous and next buttons
$pager.append(renderButton('|<', pagenumber, pagecount, buttonClickCallback)).append(renderButton('<', pagenumber, pagecount, buttonClickCallback));
// pager currently only handles 10 viewable pages ( could be easily parameterized, maybe in next version ) so handle edge cases
var startPoint = 1;
var endPoint = 5;
if (pagenumber >= 5) {
startPoint = pagenumber - 2;
endPoint = pagenumber + 2;
}
if (endPoint > pagecount) {
startPoint = pagecount - 4;
endPoint = pagecount;
}
if (startPoint < 1) {
startPoint = 1;
}
// loop thru visible pages and render buttons
for (var page = startPoint; page <= endPoint; page++) {
var currentButton = $('' + (page) + '');
page == pagenumber ? currentButton.addClass('pgCurrent') : currentButton.click(function() { buttonClickCallback(this.firstChild.data); });
currentButton.appendTo($pager);
}
// render in the next and 末页 buttons before returning the whole rendered control back.
$pager.append(renderButton('>', pagenumber, pagecount, buttonClickCallback)).append(renderButton('>|', pagenumber, pagecount, buttonClickCallback));
return $pager;
}
// renders and returns a 'specialized' button, ie 'next', 'previous' etc. rather than a page number button
function renderButton(buttonLabel, pagenumber, pagecount, buttonClickCallback) {
var $Button = $('' + buttonLabel + '');
var destPage = 1;
// work out destination page for required button type
switch (buttonLabel) {
case "|<":
destPage = 1;
break;
case "<":
destPage = pagenumber - 1;
break;
case ">":
destPage = pagenumber + 1;
break;
case ">|":
destPage = pagecount;
break;
}
// disable and 'grey' out buttons if not needed.
if (buttonLabel == "|<" || buttonLabel == "<") {
pagenumber <= 1 ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });
}
else {
pagenumber >= pagecount ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });
}
return $Button;
}
// pager defaults. hardly worth bothering with in this case but used as placeholder for expansion in the next version
$.fn.pager.defaults = {
pagenumber: 1,
pagecount: 1
};
})(jQuery);