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Paginate a grid of items
// IMPORTANT!
// If you're already using Modernizr, delete it from this file. If you don't know what Modernizr is, leave it :)
/* Modernizr 2.5.3 (Custom Build) | MIT & BSD
* Build: http://www.modernizr.com/download/#-csstransforms-csstransforms3d-csstransitions-cssclasses-prefixed-teststyles-testprop-testallprops-prefixes-domprefixes
*/
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/**
* Paginate by Glen Cheney
* http://glencheney.com
*/
(function($) {
var paginate = 'paginate',
methods = {
init : function(options) {
var settings = {
'itemSelector' : '.item',
'itemWidth' : 230,
'margins' : 20,
'key' : 'all',
'prevClass' : '.paginate-prev',
'nextClass' : '.paginate-next',
'pagesSelector' : '.paginate-container .pages',
'controls' : '.paginate-controls'
};
if (options) {
$.extend(settings, options);
}
return this.each(function() {
var $this = $(this),
$items = $this.children(settings.itemSelector),
itemsPerRow = 3,
//itemsPerRow = Math.floor($this.width() / settings.itemWidth),
numRows = 2,
itemHeight = $items.first().outerHeight(),
data;
data = {
'itemSelector' : settings.itemSelector,
'pagesSelector' : settings.pagesSelector,
'$items' : $items,
'itemsPerRow' : itemsPerRow,
'numRows' : numRows,
'itemHeight' : itemHeight,
'itemWidth' : settings.itemWidth,
'margins' : settings.margins,
'prevClass' : settings.prevClass,
'nextClass' : settings.nextClass,
'controls' : settings.controls
};
$this.data(paginate, data);
// Disabled CSS Animations if we're going to use jQuery to animate
if (!Modernizr.csstransforms || !Modernizr.csstransitions) {
methods.setPrefixedCss($items, 'transition', 'none');
}
// Set up click events for next and previous
methods.clicks.call(this);
// Do it
methods.paginate.call(this, 'all');
});
},
paginate : function(category) {
var $this = $(this),
data = $this.data(paginate);
// If we somehow don't have data, initialize it
if (!data) {
methods.init.call(this);
data = $(this).data(paginate);
}
if (!category) category = 'all';
// Hide/show appropriate items
if (category == 'all') {
data.$items.removeClass('concealed stage-left stage-center stage-right');
} else {
data.$items.removeClass('concealed stage-left stage-center stage-right filtered').each(function() {
var keys = $(this).attr('data-key'),
kArray = $.parseJSON(keys);
if ($.inArray(category, kArray) === -1) {
$(this).addClass('concealed');
return;
}
});
}
data.$items.not('.concealed').addClass('filtered');
// Create the controls
methods.createControls.call(this, $this.find('.filtered').length);
// Shrink each concealed item
methods.shrink.call(this);
// Update transforms on .filtered elements so they will animate to their new positions
methods.filter.call(this);
methods.navigated.call($(this), 0);
},
clicks : function() {
var $this = $(this)
, data = $this.data(paginate);
$this.parent().find(data.nextClass).click(function(){
$this.paginate('next');
});
$this.parent().find(data.prevClass).click(function(){
$this.paginate('prev');
});
},
shrink : function() {
var $concealed = $(this).find('.concealed');
if ($concealed.length === 0) {
return;
}
$concealed.each(function() {
var $this = $(this),
x = parseInt($this.attr('data-x')),
y = parseInt($this.attr('data-y')),
data = $this.parent().data(paginate);
if (!x) x = 0;
if (!y) y = 0;
methods.transition({
$this: $this,
x: x,
y: y,
left: (x + (data.itemWidth / 2)) + 'px',
top: (y + (data.itemHeight / 2)) + 'px',
scale : 0.001,
opacity: 0,
height: '0px',
width: '0px'
});
});
},
filter : function() {
var $this = $(this)
, $filtered = $(this).find('.filtered')
, data = $this.data(paginate)
, pages = Math.floor(($filtered.length - 1) / (data.itemsPerRow * data.numRows));
$this.attr('data-pages', pages + 1);
$filtered.each(function(index) {
var $this = $(this),
//data = $this.parent().data(paginate),
row = Math.floor(index / data.itemsPerRow),
x = (index % data.itemsPerRow) * (data.itemWidth + data.margins),
y = (row % data.numRows) * (data.itemHeight + data.margins),
page = Math.floor(index / (data.itemsPerRow * data.numRows));
// Save data for shrink
$this.attr({'data-x' : x, 'data-y' : y, 'data-page' : page});
if (page === 0) {
$this.addClass('stage-center');
}
else if (page > 0) {
$this.addClass('stage-right');
x += $this.parent().width();
}
methods.transition({
$this: $this,
x: x,
y: y,
left: x + 'px',
top: y + 'px',
scale : 1,
opacity: 1,
height: data.itemHeight + 'px',
width: data.itemWidth + 'px'
});
});
},
/**
* Uses Modernizr's prefixed() to get the correct
* vendor property name and sets it using jQuery .css()
* @param {jq} $el the jquery object to set the css on
* @param {string} prop the property to set (e.g. 'transition')
* @param {string} value the value of the prop
*/
setPrefixedCss : function($el, prop, value) {
$el.css(Modernizr.prefixed(prop), value);
},
transition: function(opts) {
var transform;
// Use CSS Transforms if we have them
if (Modernizr.csstransforms && Modernizr.csstransitions) {
if (Modernizr.csstransforms3d) {
transform = 'translate3d(' + opts.x + 'px, ' + opts.y + 'px, 0px) scale3d(' + opts.scale + ', ' + opts.scale + ', ' + opts.scale + ')';
} else {
transform = 'translate(' + opts.x + 'px, ' + opts.y + 'px) scale(' + opts.scale + ', ' + opts.scale + ')';
}
// Update css to trigger CSS Animation
methods.setPrefixedCss(opts.$this, 'transform', transform);
} else {
// Use jQuery to animate left/top
opts.$this.animate({
left: opts.left,
top: opts.top,
opacity: opts.opacity,
height: opts.height,
width: opts.width
}, 400);
}
},
/**
* Handles moving the current stage-center items to stage-left and
* moving the stage-right items with a data-page attr of +1 to stage center
* Gets the current page from the container (#grid), which is 1-based index
*/
next : function() {
methods.navigate.call(this, parseInt(this.attr('data-current-page')));
},
/**
* Handles moving the current stage-center items to stage-right and
* moving the stage-left items with a data-page attr of +1 to stage center
*/
prev : function() {
methods.navigate.call(this, parseInt(this.attr('data-current-page')) - 2);
},
/**
* @param {int} toIndex index to navigate to.
*/
navigate : function(toIndex) {
var data = this.data(paginate),
$filtered = this.find('.filtered'),
currentPage = parseInt($filtered.filter('.stage-center').first().attr('data-page')),
$newCenter = $filtered.filter('[data-page=' + toIndex + ']'),
$animating = $filtered.filter(function() {
var itemsPage = parseInt($(this).attr('data-page'));
if (toIndex > currentPage) {
return itemsPage < toIndex;
} else {
return itemsPage > toIndex;
}
}),
toStage = toIndex > currentPage ? 'stage-left' : 'stage-right',
fromStage = toStage == 'stage-left' ? 'stage-right' : 'stage-left';
// Make sure there's stuff to see
if ($newCenter.length === 0) {
return;
}
$animating.removeClass('stage-center ' + fromStage).addClass(toStage);
$newCenter.addClass('stage-center').removeClass(fromStage);
// Transition the old stage-center items to stage-left/right
$animating.each(function(){
var $this = $(this),
containerWidth = $this.parent().width(),
x = toIndex > currentPage ? parseInt($this.attr('data-x')) - containerWidth : parseInt($this.attr('data-x')) + containerWidth,
y = parseInt($this.attr('data-y')),
h = $this.height() + 'px',
w = $this.width() + 'px';
methods.transition({
$this: $(this),
x: x,
y: y,
left: x + 'px',
top: y + 'px',
scale : 1,
opacity: 1,
height: h,
width: w
});
});
// Transition the old stage-right items to stage-center
$newCenter.each(function(index){
var $this = $(this),
x = (index % data.itemsPerRow) * (data.itemWidth + data.margins),
y = parseInt($this.attr('data-y')),
h = $this.height() + 'px',
w = $this.width() + 'px';
methods.transition({
$this: $(this),
x: x,
y: y,
left: x + 'px',
top: y + 'px',
scale : 1,
opacity: 1,
height: h,
width: w
});
});
methods.navigated.call(this, toIndex);
},
/**
* Puts the 'can-nav' class on the prev or next buttons where appropriate.
* Puts the 'active' class on the correct control element
* Shows the current page youre on and the total pages
*
* @param {int} toIndex The zero based index of the page navigated to.
*/
navigated : function(toIndex) {
var data = this.data(paginate),
hasStageLeft = this.find('.filtered[data-page=' + (toIndex - 1) + ']').length > 0,
hasStageRight = this.find('.filtered[data-page=' + (toIndex + 1) + ']').length > 0;
// add Page 1/2
this.attr('data-current-page', toIndex + 1);
$(data.pagesSelector).text('Page ' + this.attr('data-current-page') + '/' + this.attr('data-pages'));
// Add classes to navigation buttons specifying if it can navigate
if (hasStageLeft) {
$(data.prevClass).addClass('can-nav');
} else {
$(data.prevClass).removeClass('can-nav');
}
if (hasStageRight) {
$(data.nextClass).addClass('can-nav');
} else {
$(data.nextClass).removeClass('can-nav');
}
$(data.controls + ' span').each(function(index){
if (toIndex != index) $(this).removeClass('active');
else $(this).addClass('active');
});
},
/**
* Creates the span elements and places them in the control element
*
* @param {int} total the total number of items. The function will figure out the number of pages.
*/
createControls : function(total) {
var $this = $(this),
data = $this.data(paginate),
$controls = $(data.controls),
pages = Math.ceil(total / (data.itemsPerRow * data.numRows)),
$ctrl,
ctrlsWidth,
html = '',
i = 0;
for (; i < pages; i++) {
html += '<span data-index="' + i + '">' + (i + 1) + '</span>';
}
$controls.html(html);
$ctrl = $controls.children().first();
ctrlsWidth = (($ctrl.width() + parseInt($ctrl.css('marginRight'))) * pages) - parseInt($ctrl.css('marginRight'));
$controls.css('width', ctrlsWidth);
$(data.controls).children().each(function() {
var $control = $(this);
$control.on('click', function(){
$this.paginate('navigate', parseInt($control.attr('data-index')));
});
});
}
};
$.fn.paginate = function(method) {
if (methods[method]) {
return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
} else if (typeof method === 'object' || ! method) {
return methods.init.apply(this, arguments);
} else {
$.error('Method ' + method + ' does not exist on jQuery.paginate');
return false;
}
};
})(jQuery);
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