(function () {
var Paginator = YAHOO.widget.Paginator,
l = YAHOO.lang;
/**
* ui Component to generate the page links
*
* @namespace YAHOO.widget.Paginator.ui
* @class PageLinks
* @for YAHOO.widget.Paginator
*
* @constructor
* @param p {Pagintor} Paginator instance to attach to
*/
Paginator.ui.PageLinks = function (p) {
this.paginator = p;
p.subscribe('recordOffsetChange',this.update,this,true);
p.subscribe('rowsPerPageChange',this.update,this,true);
p.subscribe('totalRecordsChange',this.update,this,true);
p.subscribe('pageLinksChange', this.rebuild,this,true);
p.subscribe('pageLinkClassChange', this.rebuild,this,true);
p.subscribe('currentPageClassChange', this.rebuild,this,true);
p.subscribe('destroy',this.destroy,this,true);
//TODO: Make this work
p.subscribe('pageLinksContainerClassChange', this.rebuild,this,true);
};
/**
* Decorates Paginator instances with new attributes. Called during
* Paginator instantiation.
* @method init
* @param p {Paginator} Paginator instance to decorate
* @static
*/
Paginator.ui.PageLinks.init = function (p) {
/**
* CSS class assigned to each page link/span.
* @attribute pageLinkClass
* @default 'yui-pg-page'
*/
p.setAttributeConfig('pageLinkClass', {
value : 'yui-pg-page',
validator : l.isString
});
/**
* CSS class assigned to the current page span.
* @attribute currentPageClass
* @default 'yui-pg-current-page'
*/
p.setAttributeConfig('currentPageClass', {
value : 'yui-pg-current-page',
validator : l.isString
});
/**
* CSS class assigned to the span containing the page links.
* @attribute pageLinksContainerClass
* @default 'yui-pg-pages'
*/
p.setAttributeConfig('pageLinksContainerClass', {
value : 'yui-pg-pages',
validator : l.isString
});
/**
* Maximum number of page links to display at one time.
* @attribute pageLinks
* @default 10
*/
p.setAttributeConfig('pageLinks', {
value : 10,
validator : Paginator.isNumeric
});
/**
* Function used generate the innerHTML for each page link/span. The
* function receives as parameters the page number and a reference to the
* paginator object.
* @attribute pageLabelBuilder
* @default function (page, paginator) { return page; }
*/
p.setAttributeConfig('pageLabelBuilder', {
value : function (page, paginator) { return page; },
validator : l.isFunction
});
};
/**
* Calculates start and end page numbers given a current page, attempting
* to keep the current page in the middle
* @static
* @method calculateRange
* @param {int} currentPage The current page
* @param {int} totalPages (optional) Maximum number of pages
* @param {int} numPages (optional) Preferred number of pages in range
* @return {Array} [start_page_number, end_page_number]
*/
Paginator.ui.PageLinks.calculateRange = function (currentPage,totalPages,numPages) {
var UNLIMITED = Paginator.VALUE_UNLIMITED,
start, end, delta;
// Either has no pages, or unlimited pages. Show none.
if (!currentPage || numPages === 0 || totalPages === 0 ||
(totalPages === UNLIMITED && numPages === UNLIMITED)) {
return [0,-1];
}
// Limit requested pageLinks if there are fewer totalPages
if (totalPages !== UNLIMITED) {
numPages = numPages === UNLIMITED ?
totalPages :
Math.min(numPages,totalPages);
}
// Determine start and end, trying to keep current in the middle
start = Math.max(1,Math.ceil(currentPage - (numPages/2)));
if (totalPages === UNLIMITED) {
end = start + numPages - 1;
} else {
end = Math.min(totalPages, start + numPages - 1);
}
// Adjust the start index when approaching the last page
delta = numPages - (end - start + 1);
start = Math.max(1, start - delta);
return [start,end];
};
Paginator.ui.PageLinks.prototype = {
/**
* Current page
* @property current
* @type number
* @private
*/
current : 0,
/**
* Span node containing the page links
* @property container
* @type HTMLElement
* @private
*/
container : null,
/**
* Generate the nodes and return the container node containing page links
* appropriate to the current pagination state.
* @method render
* @param id_base {string} used to create unique ids for generated nodes
* @return {HTMLElement}
*/
render : function (id_base) {
var p = this.paginator;
// Set up container
this.container = document.createElement('span');
this.container.id = id_base + '-pages';
this.container.className = p.get('pageLinksContainerClass');
YAHOO.util.Event.on(this.container,'click',this.onClick,this,true);
// Call update, flagging a need to rebuild
this.update({newValue : null, rebuild : true});
return this.container;
},
/**
* Update the links if appropriate
* @method update
* @param e {CustomEvent} The calling change event
*/
update : function (e) {
if (e && e.prevValue === e.newValue) {
return;
}
var p = this.paginator,
currentPage = p.getCurrentPage();
// Replace content if there's been a change
if (this.current !== currentPage || !currentPage || e.rebuild) {
var labelBuilder = p.get('pageLabelBuilder'),
range = Paginator.ui.PageLinks.calculateRange(
currentPage,
p.getTotalPages(),
p.get('pageLinks')),
start = range[0],
end = range[1],
content = '',
linkTemplate,i;
linkTemplate = '<a href="#" class="' + p.get('pageLinkClass') +
'" page="';
for (i = start; i <= end; ++i) {
if (i === currentPage) {
content +=
'<span class="' + p.get('currentPageClass') + ' ' +
p.get('pageLinkClass') + '">' +
labelBuilder(i,p) + '</span>';
} else {
content +=
linkTemplate + i + '">' + labelBuilder(i,p) + '</a>';
}
}
this.container.innerHTML = content;
}
},
/**
* Force a rebuild of the page links.
* @method rebuild
* @param e {CustomEvent} The calling change event
*/
rebuild : function (e) {
e.rebuild = true;
this.update(e);
},
/**
* Removes the page links container node and clears event listeners
* @method destroy
* @private
*/
destroy : function () {
YAHOO.util.Event.purgeElement(this.container,true);
this.container.parentNode.removeChild(this.container);
this.container = null;
},
/**
* Listener for the container's onclick event. Looks for qualifying link
* clicks, and pulls the page number from the link's page attribute.
* Sends link's page attribute to the Paginator's setPage method.
* @method onClick
* @param e {DOMEvent} The click event
*/
onClick : function (e) {
var t = YAHOO.util.Event.getTarget(e);
if (t && YAHOO.util.Dom.hasClass(t,
this.paginator.get('pageLinkClass'))) {
YAHOO.util.Event.stopEvent(e);
this.paginator.setPage(parseInt(t.getAttribute('page'),10));
}
}
};
})();