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August 12, 2010 07:41
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| /** | |
| * componenets.pager | |
| * Pagination component | |
| * | |
| * @example | |
| * var pager = new SPG.components.pager({ | |
| * itemsQuantity: 1000, | |
| * itemsPerPage: 10, | |
| * displayPagesQuantity: 7, | |
| * currentPageNumber: 1, | |
| * onchange: function(index, quantity, page) { | |
| * | |
| * // Some code there | |
| * | |
| * } | |
| * }); | |
| * | |
| * $(document.body).append(pager.element); | |
| * | |
| * @interface | |
| * VARIABLES | |
| * element - jquery DOM object | |
| * options - options object | |
| * current - number of the current page | |
| * | |
| * METHODS | |
| * configure - changes the configuration options | |
| * first - changes current page to the first | |
| * last - changes current page to the last | |
| * count - counts and returns the quantity of pages | |
| * next - changes current page to the next | |
| * prev - changes current page to the previous | |
| * onchange - fires "onchange" event | |
| * render - renders paginator | |
| */ | |
| SPG.utils.namespace.register('components.pager'); | |
| SPG.components.pager = function(options) { | |
| this.options = $.extend({ | |
| itemsQuantity: 30, | |
| itemsPerPage: 10, | |
| displayPagesQuantity: 7, | |
| currentPageNumber: 1, | |
| onchange: function() {}, | |
| fire: true | |
| }, options); | |
| this.current = this.options.currentPageNumber; | |
| this.element = $(document.createElement('ul')); | |
| this.element.addClass('pager'); | |
| this.build(); | |
| if(this.options.fire) { | |
| this.onchange(); | |
| } | |
| } | |
| SPG.components.pager.prototype = { | |
| // VARIABLES | |
| buttons: null, | |
| element: null, | |
| options: null, | |
| current: null, | |
| // METHODS | |
| configure: function(options) { | |
| this.options = $.extend(this.options, options); | |
| if(options.currentPageNumber) { | |
| this.current = options.currentPageNumber; | |
| } | |
| }, | |
| count: function() { | |
| return Math.ceil(this.options.itemsQuantity / this.options.itemsPerPage); | |
| }, | |
| next: function() { | |
| if(this.current < this.count()) { | |
| this.current++; | |
| this.onchange(); | |
| this.render(); | |
| } | |
| }, | |
| prev: function() { | |
| if(this.current > 0) { | |
| this.current--; | |
| this.onchange(); | |
| this.render(); | |
| } | |
| }, | |
| first: function() { | |
| this.current = 1; | |
| this.onchange(); | |
| this.render(); | |
| }, | |
| last: function() { | |
| this.current = this.count(); | |
| this.onchange(); | |
| this.render(); | |
| }, | |
| onchange: function() { | |
| var index = (this.current - 1) * this.options.itemsPerPage; | |
| var quantity = this.options.itemsPerPage; | |
| var left = this.options.itemsQuantity - index; | |
| if(left < this.options.itemsPerPage) { | |
| quantity = left; | |
| } | |
| this.options.onchange(index, quantity, this.current); | |
| }, | |
| build: function() { | |
| var that = this; | |
| this.element.empty(); | |
| this.buttons = {}; | |
| this.buttons.elseFirst = $(document.createElement('li')); | |
| this.buttons.elseSecond = $(document.createElement('li')); | |
| this.buttons.next = $(document.createElement('li')); | |
| this.buttons.prev = $(document.createElement('li')); | |
| this.buttons.pages = []; | |
| for(var i = 0; i < this.options.displayPagesQuantity && i < this.count(); i++) { | |
| this.buttons.pages[i] = $(document.createElement('li')); | |
| this.buttons.pages[i].appendTo(this.element); | |
| } | |
| this.buttons.elseFirst.addClass('else') | |
| .html('...') | |
| .prependTo(this.element); | |
| this.buttons.prev.addClass('prev') | |
| .prependTo(this.element) | |
| .click(function() { that.prev(); }); | |
| this.buttons.elseSecond.addClass('else') | |
| .html('...') | |
| .appendTo(this.element); | |
| this.buttons.next.addClass('next') | |
| .appendTo(this.element) | |
| .click(function() { that.next(); }); | |
| this.render(); | |
| }, | |
| render: function() { | |
| var pagesQuantity = this.count(); | |
| var pageNumber = 1; | |
| var half = Math.ceil(this.options.displayPagesQuantity / 2); | |
| if(pagesQuantity > this.options.displayPagesQuantity) { | |
| if(this.current > half) { | |
| pageNumber = (this.current + 1) - half; | |
| } | |
| if(this.current > pagesQuantity - half) { | |
| pageNumber = pagesQuantity - this.options.displayPagesQuantity + 1; | |
| } | |
| } | |
| var that = this; | |
| this.element.find('.selected').removeClass('selected'); | |
| for(var i = 0; i < this.options.displayPagesQuantity && i < pagesQuantity; i++) { | |
| var button = this.buttons.pages[i]; | |
| if(pageNumber == this.current) { | |
| button.addClass('selected'); | |
| } | |
| button.unbind('click'); | |
| button.bind('click', {number: pageNumber}, function(e) { | |
| that.current = e.data.number; | |
| that.render(); | |
| that.onchange(); | |
| }); | |
| button.html(pageNumber); | |
| pageNumber++; | |
| } | |
| if(pagesQuantity > this.options.displayPagesQuantity) { | |
| var prevVisibility = 'hidden'; | |
| var nextVisibility = 'hidden'; | |
| if(this.current > half) { | |
| prevVisibility = 'visible'; | |
| } | |
| if(pageNumber - 1 < pagesQuantity) { | |
| nextVisibility = 'visible'; | |
| } | |
| this.buttons.elseFirst.css('visibility', prevVisibility); | |
| this.buttons.prev.css('visibility', prevVisibility) | |
| this.buttons.elseSecond.css('visibility', nextVisibility); | |
| this.buttons.next.css('visibility', nextVisibility); | |
| } | |
| } | |
| }; |
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