www.gusucode.com > 200套html5精品模板1_50 > 200套html5精品模板1_50/045/js/jquery.elastislide.js
(function( window, $, undefined ) {
// http://www.netcu.de/jquery-touchwipe-iphone-ipad-library
$.fn.touchwipe = function(settings) {
var config = {
min_move_x: 20,
min_move_y: 20,
wipeLeft: function() { },
wipeRight: function() { },
wipeUp: function() { },
wipeDown: function() { },
preventDefaultEvents: true
};
if (settings) $.extend(config, settings);
this.each(function() {
var startX;
var startY;
var isMoving = false;
function cancelTouch() {
this.removeEventListener('touchmove', onTouchMove);
startX = null;
isMoving = false;
}
function onTouchMove(e) {
if(config.preventDefaultEvents) {
e.preventDefault();
}
if(isMoving) {
var x = e.touches[0].pageX;
var y = e.touches[0].pageY;
var dx = startX - x;
var dy = startY - y;
if(Math.abs(dx) >= config.min_move_x) {
cancelTouch();
if(dx > 0) {
config.wipeLeft();
}
else {
config.wipeRight();
}
}
else if(Math.abs(dy) >= config.min_move_y) {
cancelTouch();
if(dy > 0) {
config.wipeDown();
}
else {
config.wipeUp();
}
}
}
}
function onTouchStart(e)
{
if (e.touches.length == 1) {
startX = e.touches[0].pageX;
startY = e.touches[0].pageY;
isMoving = true;
this.addEventListener('touchmove', onTouchMove, false);
}
}
if ('ontouchstart' in document.documentElement) {
this.addEventListener('touchstart', onTouchStart, false);
}
});
return this;
};
$.elastislide = function( options, element ) {
this.$el = $( element );
this._init( options );
};
$.elastislide.defaults = {
speed : 450, // animation speed
easing : '', // animation easing effect
imageW : 190, // the images width
margin : 0, // image margin right
border : 0, // image border
minItems : 1, // the minimum number of items to show.
// when we resize the window, this will make sure minItems are always shown
// (unless of course minItems is higher than the total number of elements)
current : 0, // index of the current item
// when we resize the window, the carousel will make sure this item is visible
onClick : function() { return false; } // click item callback
};
$.elastislide.prototype = {
_init : function( options ) {
this.options = $.extend( true, {}, $.elastislide.defaults, options );
// <ul>
this.$slider = this.$el.find('ul');
// <li>
this.$items = this.$slider.children('li');
// total number of elements / images
this.itemsCount = this.$items.length;
// cache the <ul>'s parent, since we will eventually need to recalculate its width on window resize
this.$esCarousel = this.$slider.parent();
// validate options
this._validateOptions();
// set sizes and initialize some vars...
this._configure();
// add navigation buttons
this._addControls();
// initialize the events
this._initEvents();
// show the <ul>
this.$slider.show();
// slide to current's position
this._slideToCurrent( false );
},
_validateOptions : function() {
if( this.options.speed < 0 )
this.options.speed = 450;
if( this.options.margin < 0 )
this.options.margin = 4;
if( this.options.border < 0 )
this.options.border = 1;
if( this.options.minItems < 1 || this.options.minItems > this.itemsCount )
this.options.minItems = 1;
if( this.options.current > this.itemsCount - 1 )
this.options.current = 0;
},
_configure : function() {
// current item's index
this.current = this.options.current;
// the ul's parent's (div.es-carousel) width is the "visible" width
this.visibleWidth = this.$esCarousel.width();
// test to see if we need to initially resize the items
if( this.visibleWidth < this.options.minItems * ( this.options.imageW + 2 * this.options.border ) + ( this.options.minItems - 1 ) * this.options.margin ) {
this._setDim( ( this.visibleWidth - ( this.options.minItems - 1 ) * this.options.margin ) / this.options.minItems );
this._setCurrentValues();
// how many items fit with the current width
this.fitCount = this.options.minItems;
}
else {
this._setDim();
this._setCurrentValues();
}
// set the <ul> width
this.$slider.css({
width : this.sliderW
});
},
_setDim : function( elW ) {
// <li> style
this.$items.css({
marginRight : this.options.margin,
width : ( elW ) ? elW : this.options.imageW + 2 * this.options.border
}).children('a').css({ // <a> style
borderWidth : this.options.border
});
},
_setCurrentValues : function() {
// the total space occupied by one item
this.itemW = this.$items.outerWidth(true);
// total width of the slider / <ul>
// this will eventually change on window resize
this.sliderW = this.itemW * this.itemsCount;
// the ul parent's (div.es-carousel) width is the "visible" width
this.visibleWidth = this.$esCarousel.width();
// how many items fit with the current width
this.fitCount = Math.floor( this.visibleWidth / this.itemW );
},
_addControls : function() {
this.$navNext = $('<span class="es-nav-next">Next</span>');
this.$navPrev = $('<span class="es-nav-prev">Previous</span>');
$('<div class="es-nav"/>')
.append( this.$navPrev )
.append( this.$navNext )
.appendTo( this.$el );
//this._toggleControls();
},
_toggleControls : function( dir, status ) {
// show / hide navigation buttons
if( dir && status ) {
if( status === 1 )
( dir === 'right' ) ? this.$navNext.show() : this.$navPrev.show();
else
( dir === 'right' ) ? this.$navNext.hide() : this.$navPrev.hide();
}
else if( this.current === this.itemsCount - 1 || this.fitCount >= this.itemsCount )
this.$navNext.hide();
},
_initEvents : function() {
var instance = this;
// window resize
$(window).bind('resize.elastislide', function( event ) {
// set values again
instance._setCurrentValues();
// need to resize items
if( instance.visibleWidth < instance.options.minItems * ( instance.options.imageW + 2 * instance.options.border ) + ( instance.options.minItems - 1 ) * instance.options.margin ) {
instance._setDim( ( instance.visibleWidth - ( instance.options.minItems - 1 ) * instance.options.margin ) / instance.options.minItems );
instance._setCurrentValues();
instance.fitCount = instance.options.minItems;
}
else{
instance._setDim();
instance._setCurrentValues();
}
instance.$slider.css({
width : instance.sliderW + 10 // TODO: +10px seems to solve a firefox "bug" :S
});
// slide to the current element
clearTimeout( instance.resetTimeout );
instance.resetTimeout = setTimeout(function() {
instance._slideToCurrent();
}, 200);
});
// navigation buttons events
this.$navNext.bind('click.elastislide', function( event ) {
instance._slide('right');
});
this.$navPrev.bind('click.elastislide', function( event ) {
instance._slide('left');
});
// item click event
this.$items.bind('click.elastislide', function( event ) {
instance.options.onClick( $(this) );
//return false;
});
// touch events
instance.$slider.touchwipe({
wipeLeft : function() {
instance._slide('right');
},
wipeRight : function() {
instance._slide('left');
}
});
},
_slide : function( dir, val, anim, callback ) {
// if animating return
if( this.$slider.is(':animated') )
return false;
// current margin left
var ml = parseFloat( this.$slider.css('margin-left') );
// val is just passed when we want an exact value for the margin left (used in the _slideToCurrent function)
if( val === undefined ) {
// how much to slide?
var amount = this.fitCount * this.itemW, val;
if( amount < 0 ) return false;
// make sure not to leave a space between the last item / first item and the end / beggining of the slider available width
if( dir === 'right' && this.sliderW - ( Math.abs( ml ) + amount ) < this.visibleWidth ) {
amount = this.sliderW - ( Math.abs( ml ) + this.visibleWidth ) - this.options.margin; // decrease the margin left
// show / hide navigation buttons
this._toggleControls( 'right', -1 );
this._toggleControls( 'left', 1 );
}
else if( dir === 'left' && Math.abs( ml ) - amount < 0 ) {
amount = Math.abs( ml );
// show / hide navigation buttons
this._toggleControls( 'left', -1 );
this._toggleControls( 'right', 1 );
}
else {
var fml; // future margin left
( dir === 'right' )
? fml = Math.abs( ml ) + this.options.margin + Math.abs( amount )
: fml = Math.abs( ml ) - this.options.margin - Math.abs( amount );
// show / hide navigation buttons
if( fml > 0 )
this._toggleControls( 'left', 1 );
else
this._toggleControls( 'left', -1 );
if( fml < this.sliderW - this.visibleWidth )
this._toggleControls( 'right', 1 );
else
this._toggleControls( 'right', -1 );
}
( dir === 'right' ) ? val = '-=' + amount : val = '+=' + amount
}
else {
var fml = Math.abs( val ); // future margin left
if( Math.max( this.sliderW, this.visibleWidth ) - fml < this.visibleWidth ) {
val = - ( Math.max( this.sliderW, this.visibleWidth ) - this.visibleWidth );
if( val !== 0 )
val += this.options.margin; // decrease the margin left if not on the first position
// show / hide navigation buttons
this._toggleControls( 'right', -1 );
fml = Math.abs( val );
}
// show / hide navigation buttons
if( fml > 0 )
this._toggleControls( 'left', 1 );
else
this._toggleControls( 'left', -1 );
if( Math.max( this.sliderW, this.visibleWidth ) - this.visibleWidth > fml + this.options.margin )
this._toggleControls( 'right', 1 );
else
this._toggleControls( 'right', -1 );
}
$.fn.applyStyle = ( anim === undefined ) ? $.fn.animate : $.fn.css;
var sliderCSS = { marginLeft : val };
var instance = this;
this.$slider.applyStyle( sliderCSS, $.extend( true, [], { duration : this.options.speed, easing : this.options.easing, complete : function() {
if( callback ) callback.call();
} } ) );
},
_slideToCurrent : function( anim ) {
// how much to slide?
var amount = this.current * this.itemW;
this._slide('', -amount, anim );
},
add : function( $newelems, callback ) {
// adds new items to the carousel
this.$items = this.$items.add( $newelems );
this.itemsCount = this.$items.length;
this._setDim();
this._setCurrentValues();
this.$slider.css({
width : this.sliderW
});
this._slideToCurrent();
if ( callback ) callback.call( $newelems );
},
destroy : function( callback ) {
this._destroy( callback );
},
_destroy : function( callback ) {
this.$el.unbind('.elastislide').removeData('elastislide');
$(window).unbind('.elastislide');
if ( callback ) callback.call();
}
};
var logError = function( message ) {
if ( this.console ) {
console.error( message );
}
};
$.fn.elastislide = function( options ) {
if ( typeof options === 'string' ) {
var args = Array.prototype.slice.call( arguments, 1 );
this.each(function() {
var instance = $.data( this, 'elastislide' );
if ( !instance ) {
logError( "cannot call methods on elastislide prior to initialization; " +
"attempted to call method '" + options + "'" );
return;
}
if ( !$.isFunction( instance[options] ) || options.charAt(0) === "_" ) {
logError( "no such method '" + options + "' for elastislide instance" );
return;
}
instance[ options ].apply( instance, args );
});
}
else {
this.each(function() {
var instance = $.data( this, 'elastislide' );
if ( !instance ) {
$.data( this, 'elastislide', new $.elastislide( options, this ) );
}
});
}
return this;
};
})( window, jQuery );