/**
* This jQuery plugin displays pagination links inside the selected elements.
*
* @author Gabriel Birke (birke *at* d-scribe *dot* de)
* @version 1.1
* @param {int} maxentries Number of entries to paginate
* @param {Object} opts Several options (see README for documentation)
* @return {Object} jQuery Object
*/
jQuery.fn.pagination = function(maxentries, opts) {
opts = jQuery.extend({
items_per_page: 10,
num_display_entries: 10,
current_page: 0,
num_edge_entries: 0,
link_to: "#",
prev_text: "Prev",
next_text: "Next",
ellipse_text: "...",
prev_show_always: true,
next_show_always: true,
callback: function() { return false; }
}, opts || {});
return this.each(function() {
/**
* Calculate the maximum number of pages
*/
function numPages() {
return Math.ceil(maxentries / opts.items_per_page);
}
/**
* Calculate start and end point of pagination links depending on
* current_page and num_display_entries.
* @return {Array}
*/
function getInterval() {
var ne_half = Math.ceil(opts.num_display_entries / 2);
var np = numPages();
var upper_limit = np - opts.num_display_entries;
var start = current_page > ne_half ? Math.max(Math.min(current_page - ne_half, upper_limit), 0) : 0;
var end = current_page > ne_half ? Math.min(current_page + ne_half, np) : Math.min(opts.num_display_entries, np);
return [start, end];
}
/**
* This is the event handling function for the pagination links.
* @param {int} page_id The new page number
*/
function pageSelected(page_id, evt) {
current_page = page_id;
drawLinks();
var continuePropagation = opts.callback(page_id, panel);
if (!continuePropagation) {
if (evt.stopPropagation) {
evt.stopPropagation();
}
else {
evt.cancelBubble = true;
}
}
return continuePropagation;
}
/**
* This function inserts the pagination links into the container element
*/
function drawLinks() {
panel.empty();
var interval = getInterval();
var np = numPages();
// This helper function returns a handler function that calls pageSelected with the right page_id
var getClickHandler = function(page_id) {
return function(evt) { return pageSelected(page_id, evt); }
}
// Helper function for generating a single link (or a span tag if it'S the current page)
var appendItem = function(page_id, appendopts) {
page_id = page_id < 0 ? 0 : (page_id < np ? page_id : np - 1); // Normalize page id to sane value
appendopts = jQuery.extend({ text: page_id + 1, classes: "current" }, appendopts || {});
if (page_id == current_page) {
var lnk = $("<span class='current'>" + (appendopts.text) + "</span>");
}
else {
var lnk = $("<a>" + (appendopts.text) + "</a>")
.bind("click", getClickHandler(page_id))
.attr('href', opts.link_to.replace(/__id__/, page_id));
}
if (appendopts.classes) { lnk.removeAttr('class'); lnk.addClass(appendopts.classes); }
panel.append(lnk);
}
// Generate "Previous"-Link
if (opts.prev_text && (current_page > 0 || opts.prev_show_always)) {
appendItem(current_page - 1, { text: opts.prev_text, classes: "disabled" });
}
// Generate starting points
if (interval[0] > 0 && opts.num_edge_entries > 0) {
var end = Math.min(opts.num_edge_entries, interval[0]);
for (var i = 0; i < end; i++) {
appendItem(i);
}
if (opts.num_edge_entries < interval[0] && opts.ellipse_text) {
jQuery("<span>" + opts.ellipse_text + "</span>").appendTo(panel);
}
}
// Generate interval links
for (var i = interval[0]; i < interval[1]; i++) {
appendItem(i);
}
// Generate ending points
if (interval[1] < np && opts.num_edge_entries > 0) {
if (np - opts.num_edge_entries > interval[1] && opts.ellipse_text) {
jQuery("<span>" + opts.ellipse_text + "</span>").appendTo(panel);
}
var begin = Math.max(np - opts.num_edge_entries, interval[1]);
for (var i = begin; i < np; i++) {
appendItem(i);
}
}
// Generate "Next"-Link
if (opts.next_text && (current_page < np - 1 || opts.next_show_always)) {
appendItem(current_page + 1, { text: opts.next_text, classes: "disabled" });
}
}
// Extract current_page from options
var current_page = opts.current_page;
// Create a sane value for maxentries and items_per_page
maxentries = (!maxentries || maxentries < 0) ? 1 : maxentries;
opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0) ? 1 : opts.items_per_page;
// Store DOM element for easy access from all inner functions
var panel = jQuery(this);
// Attach control functions to the DOM element
this.selectPage = function(page_id) { pageSelected(page_id); }
this.prevPage = function() {
if (current_page > 0) {
pageSelected(current_page - 1);
return true;
}
else {
return false;
}
}
this.nextPage = function() {
if (current_page < numPages() - 1) {
pageSelected(current_page + 1);
return true;
}
else {
return false;
}
}
// When all initialisation is done, draw the links
drawLinks();
});
}
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