Iniit
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jQuery.fn.pagination = function (maxentries, itemsperpage, opts) {
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opts = jQuery.extend({
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items_per_page: itemsperpage,
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num_display_entries: 4,
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current_page: 0,
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num_edge_entries: 0,
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link_to: "javascript:void(0)",
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prev_text: "Prev",
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next_text: "Next",
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ellipse_text: "...",
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prev_show_always: true,
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next_show_always: true,
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callback: function () { return false; }
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}, opts || {});
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return this.each(function () {
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/**
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* Calculate the maximum number of pages
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*/
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function numPages() {
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return Math.ceil(maxentries / opts.items_per_page);
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}
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/**
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* Calculate start and end point of pagination links depending on
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* current_page and num_display_entries.
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* @return {Array}
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*/
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function getInterval() {
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var ne_half = Math.ceil(opts.num_display_entries / 2);
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var np = numPages();
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var upper_limit = np - opts.num_display_entries;
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var start = current_page > ne_half ? Math.max(Math.min(current_page - ne_half, upper_limit), 0) : 0;
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var end = current_page > ne_half ? Math.min(current_page + ne_half, np) : Math.min(opts.num_display_entries, np);
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return [start, end];
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}
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/**
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* This is the event handling function for the pagination links.
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* @param {int} page_id The new page number
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*/
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function pageSelected(page_id, evt) {
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current_page = page_id;
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drawLinks();
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var continuePropagation = opts.callback(page_id, panel);
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if (!continuePropagation) {
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if (evt.stopPropagation) {
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evt.stopPropagation();
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}
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else {
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evt.cancelBubble = true;
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}
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}
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return continuePropagation;
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}
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/**
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* This function inserts the pagination links into the container element
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*/
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function drawLinks() {
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panel.empty();
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var list = jQuery("<ul class='" + panel.attr("class") + "'></ul>");
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panel.append(list);
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var interval = getInterval();
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var np = numPages();
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// This helper function returns a handler function that calls pageSelected with the right page_id
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var getClickHandler = function (page_id) {
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return function (evt) { return pageSelected(page_id, evt); }
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}
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// Helper function for generating a single link (or a span tag if it's the current page)
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var appendItem = function (page_id, appendopts) {
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page_id = page_id < 0 ? 0 : (page_id < np ? page_id : np - 1); // Normalize page id to sane value
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appendopts = jQuery.extend({ text: page_id + 1, classes: "" }, appendopts || {});
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if (page_id == current_page) {
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var clazz = appendopts.side ? 'disabled' : 'active';
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var lstItem = jQuery("<li class='" + clazz + " page-item'><a class='page-link'>" + (appendopts.text) + "</a></li>")
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}
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else {
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var a = jQuery("<a class='page-link'>" + (appendopts.text) + "</a>")
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.attr('href', opts.link_to.replace(/__id__/, page_id));;
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var lstItem = jQuery("<li class='page-item'></li>")
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.bind("click", getClickHandler(page_id));
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lstItem.append(a);
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}
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if (appendopts.classes) { lstItem.addClass(appendopts.classes); }
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list.append(lstItem);
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}
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// Generate "Previous"-Link
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if (opts.prev_text && (current_page > 0 || opts.prev_show_always)) {
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appendItem(current_page - 1, { text: opts.prev_text, side: true });
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}
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// Generate starting points
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if (interval[0] > 0 && opts.num_edge_entries > 0) {
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var end = Math.min(opts.num_edge_entries, interval[0]);
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for (var i = 0; i < end; i++) {
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appendItem(i);
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}
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if (opts.num_edge_entries < interval[0] && opts.ellipse_text) {
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jQuery("<li class='disabled page-item'>" + opts.ellipse_text + "</li>").appendTo(list);
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}
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}
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// Generate interval links
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for (var i = interval[0]; i < interval[1]; i++) {
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appendItem(i);
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}
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// Generate ending points
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if (interval[1] < np && opts.num_edge_entries > 0) {
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if (np - opts.num_edge_entries > interval[1] && opts.ellipse_text) {
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jQuery("<li class='disabled page-item'>" + opts.ellipse_text + "</li>").appendTo(list);
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}
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var begin = Math.max(np - opts.num_edge_entries, interval[1]);
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for (var i = begin; i < np; i++) {
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appendItem(i);
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}
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}
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// Generate "Next"-Link
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if (opts.next_text && (current_page < np - 1 || opts.next_show_always)) {
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appendItem(current_page + 1, { text: opts.next_text, side: true });
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}
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}
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// Extract current_page from options
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var current_page = opts.current_page;
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// Create a sane value for maxentries and items_per_page
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maxentries = (!maxentries || maxentries < 0) ? 1 : maxentries;
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opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0) ? 1 : opts.items_per_page;
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// Store DOM element for easy access from all inner functions
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var panel = jQuery(this);
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// Attach control functions to the DOM element
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this.selectPage = function (page_id) { pageSelected(page_id); }
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this.prevPage = function () {
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if (current_page > 0) {
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pageSelected(current_page - 1);
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return true;
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}
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else {
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return false;
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}
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}
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this.nextPage = function () {
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if (current_page < numPages() - 1) {
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pageSelected(current_page + 1);
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return true;
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}
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else {
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return false;
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}
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}
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// When all initialisation is done, draw the links
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drawLinks();
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// call callback function
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//opts.callback(current_page, this);
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});
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}
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