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
() {
function
numPages() {
return
Math.
ceil
(maxentries/opts.items_per_page);
}
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
];
}
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;
}
function
drawLinks() {
panel.
empty
();
var
interval = getInterval();
var
np = numPages();
var
getClickHandler =
function
(page_id) {
return
function
(evt){
return
pageSelected(page_id,evt); }
}
var
appendItem =
function
(page_id, appendopts){
page_id = page_id<0?0:(page_id<np?page_id:np-1);
appendopts = jQuery.extend({text:page_id+1, classes:
""
}, appendopts||{});
if
(page_id == current_page){
var
lnk = jQuery(
"<a href class='currentPage'>"
+ (appendopts.text) +
"</a>"
);
}
else
{
var
lnk = jQuery(
"<a>"
+(appendopts.text)+
"</a>"
)
.bind(
"click"
, getClickHandler(page_id))
.attr('href', opts.link_to.replace(/__id__/,page_id));
}
if
(appendopts.classes) { lnk.addClass(appendopts.classes); }
panel.append(lnk);
}
panel.append(
"<span>共有 "
+ maxentries +
" 条记录,当前第 <b>"
+ (current_page + 1) +
"</b>/"
+ np +
" 页</span>"
);
if
(opts.prev_text && (current_page > 0 || opts.prev_show_always)){
appendItem(current_page-1,{text:opts.prev_text, classes:
"prev"
});
}
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(
"<a href>"
+opts.ellipse_text+
"</a>"
).appendTo(panel);
}
}
for
(
var
i=interval[0]; i<interval[1]; i++) {
appendItem(i);
}
if
(interval[1] < np && opts.num_edge_entries > 0)
{
if
(np-opts.num_edge_entries > interval[1]&& opts.ellipse_text)
{
jQuery(
"<a href>"
+opts.ellipse_text+
"</a>"
).appendTo(panel);
}
var
begin = Math.max(np-opts.num_edge_entries, interval[1]);
for
(
var
i=begin; i<np; i++) {
appendItem(i);
}
}
if
(opts.next_text && (current_page < np-1 || opts.next_show_always)){
appendItem(current_page+1,{text:opts.next_text, classes:
"next"
});
}
}
var
current_page = opts.current_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;
var
panel = jQuery(this);
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;
}
}
drawLinks();
});
}