public/js/imagelightbox.js
/*
By Osvaldas Valutis, www.osvaldas.info
Available for use under the MIT License
*/
;( function( $, window, document, undefined )
{
'use strict';
var cssTransitionSupport = function()
{
var s = document.body || document.documentElement, s = s.style;
if( s.WebkitTransition == '' ) return '-webkit-';
if( s.MozTransition == '' ) return '-moz-';
if( s.OTransition == '' ) return '-o-';
if( s.transition == '' ) return '';
return false;
},
isCssTransitionSupport = cssTransitionSupport() === false ? false : true,
cssTransitionTranslateX = function( element, positionX, speed )
{
var options = {}, prefix = cssTransitionSupport();
options[ prefix + 'transform' ] = 'translateX(' + positionX + ')';
options[ prefix + 'transition' ] = prefix + 'transform ' + speed + 's linear';
element.css( options );
},
hasTouch = ( 'ontouchstart' in window ),
hasPointers = window.navigator.pointerEnabled || window.navigator.msPointerEnabled,
wasTouched = function( event )
{
if( hasTouch )
return true;
if( !hasPointers || typeof event === 'undefined' || typeof event.pointerType === 'undefined' )
return false;
if( typeof event.MSPOINTER_TYPE_MOUSE !== 'undefined' )
{
if( event.MSPOINTER_TYPE_MOUSE != event.pointerType )
return true;
}
else
if( event.pointerType != 'mouse' )
return true;
return false;
};
$.fn.imageLightbox = function( options )
{
var options = $.extend(
{
selector: 'id="imagelightbox"',
allowedTypes: 'png|jpg|jpeg|gif',
animationSpeed: 250,
preloadNext: true,
enableKeyboard: true,
quitOnEnd: false,
quitOnImgClick: false,
quitOnDocClick: true,
onStart: false,
onEnd: false,
onLoadStart: false,
onLoadEnd: false
},
options ),
targets = $([]),
target = $(),
image = $(),
imageWidth = 0,
imageHeight = 0,
swipeDiff = 0,
inProgress = false,
isTargetValid = function( element )
{
return $( element ).prop( 'tagName' ).toLowerCase() == 'a' && ( new RegExp( '\.(' + options.allowedTypes + ')$', 'i' ) ).test( $( element ).attr( 'href' ) );
},
setImage = function()
{
if( !image.length ) return true;
var screenWidth = $( window ).width() * 0.8,
screenHeight = $( window ).height() * 0.9,
tmpImage = new Image();
tmpImage.src = image.attr( 'src' );
tmpImage.onload = function()
{
imageWidth = tmpImage.width;
imageHeight = tmpImage.height;
if( imageWidth > screenWidth || imageHeight > screenHeight )
{
var ratio = imageWidth / imageHeight > screenWidth / screenHeight ? imageWidth / screenWidth : imageHeight / screenHeight;
imageWidth /= ratio;
imageHeight /= ratio;
}
image.css(
{
'width': imageWidth + 'px',
'height': imageHeight + 'px',
'top': ( $( window ).height() - imageHeight ) / 2 + 'px',
'left': ( $( window ).width() - imageWidth ) / 2 + 'px'
});
};
},
loadImage = function( direction )
{
if( inProgress ) return false;
direction = typeof direction === 'undefined' ? false : direction == 'left' ? 1 : -1;
if( image.length )
{
if( direction !== false && ( targets.length < 2 || ( options.quitOnEnd === true && ( ( direction === -1 && targets.index( target ) == 0 ) || ( direction === 1 && targets.index( target ) == targets.length - 1 ) ) ) ) )
{
quitLightbox();
return false;
}
var params = { 'opacity': 0 };
if( isCssTransitionSupport ) cssTransitionTranslateX( image, ( 100 * direction ) - swipeDiff + 'px', options.animationSpeed / 1000 );
else params.left = parseInt( image.css( 'left' ) ) + 100 * direction + 'px';
image.animate( params, options.animationSpeed, function(){ removeImage(); });
swipeDiff = 0;
}
inProgress = true;
if( options.onLoadStart !== false ) options.onLoadStart();
setTimeout( function()
{
image = $( '<img ' + options.selector + ' />' )
.attr( 'src', target.attr( 'href' ) )
.load( function()
{
image.appendTo( 'body' );
setImage();
var params = { 'opacity': 1 };
image.css( 'opacity', 0 );
if( isCssTransitionSupport )
{
cssTransitionTranslateX( image, -100 * direction + 'px', 0 );
setTimeout( function(){ cssTransitionTranslateX( image, 0 + 'px', options.animationSpeed / 1000 ) }, 50 );
}
else
{
var imagePosLeft = parseInt( image.css( 'left' ) );
params.left = imagePosLeft + 'px';
image.css( 'left', imagePosLeft - 100 * direction + 'px' );
}
image.animate( params, options.animationSpeed, function()
{
inProgress = false;
if( options.onLoadEnd !== false ) options.onLoadEnd();
});
if( options.preloadNext )
{
var nextTarget = targets.eq( targets.index( target ) + 1 );
if( !nextTarget.length ) nextTarget = targets.eq( 0 );
$( '<img />' ).attr( 'src', nextTarget.attr( 'href' ) ).load();
}
})
.error( function()
{
if( options.onLoadEnd !== false ) options.onLoadEnd();
})
var swipeStart = 0,
swipeEnd = 0,
imagePosLeft = 0;
image.on( hasPointers ? 'pointerup MSPointerUp' : 'click', function( e )
{
e.preventDefault();
if( options.quitOnImgClick )
{
quitLightbox();
return false;
}
if( wasTouched( e.originalEvent ) ) return true;
var posX = ( e.pageX || e.originalEvent.pageX ) - e.target.offsetLeft;
target = targets.eq( targets.index( target ) - ( imageWidth / 2 > posX ? 1 : -1 ) );
if( !target.length ) target = targets.eq( imageWidth / 2 > posX ? targets.length : 0 );
loadImage( imageWidth / 2 > posX ? 'left' : 'right' );
})
.on( 'touchstart pointerdown MSPointerDown', function( e )
{
if( !wasTouched( e.originalEvent ) || options.quitOnImgClick ) return true;
if( isCssTransitionSupport ) imagePosLeft = parseInt( image.css( 'left' ) );
swipeStart = e.originalEvent.pageX || e.originalEvent.touches[ 0 ].pageX;
})
.on( 'touchmove pointermove MSPointerMove', function( e )
{
if( !wasTouched( e.originalEvent ) || options.quitOnImgClick ) return true;
e.preventDefault();
swipeEnd = e.originalEvent.pageX || e.originalEvent.touches[ 0 ].pageX;
swipeDiff = swipeStart - swipeEnd;
if( isCssTransitionSupport ) cssTransitionTranslateX( image, -swipeDiff + 'px', 0 );
else image.css( 'left', imagePosLeft - swipeDiff + 'px' );
})
.on( 'touchend touchcancel pointerup pointercancel MSPointerUp MSPointerCancel', function( e )
{
if( !wasTouched( e.originalEvent ) || options.quitOnImgClick ) return true;
if( Math.abs( swipeDiff ) > 50 )
{
target = targets.eq( targets.index( target ) - ( swipeDiff < 0 ? 1 : -1 ) );
if( !target.length ) target = targets.eq( swipeDiff < 0 ? targets.length : 0 );
loadImage( swipeDiff > 0 ? 'right' : 'left' );
}
else
{
if( isCssTransitionSupport ) cssTransitionTranslateX( image, 0 + 'px', options.animationSpeed / 1000 );
else image.animate({ 'left': imagePosLeft + 'px' }, options.animationSpeed / 2 );
}
});
}, options.animationSpeed + 100 );
},
removeImage = function()
{
if( !image.length ) return false;
image.remove();
image = $();
},
quitLightbox = function()
{
if( !image.length ) return false;
image.animate({ 'opacity': 0 }, options.animationSpeed, function()
{
removeImage();
inProgress = false;
if( options.onEnd !== false ) options.onEnd();
});
};
$( window ).on( 'resize', setImage );
if( options.quitOnDocClick )
{
$( document ).on( hasTouch ? 'touchend' : 'click', function( e )
{
if( image.length && !$( e.target ).is( image ) ) quitLightbox();
})
}
if( options.enableKeyboard )
{
$( document ).on( 'keyup', function( e )
{
if( !image.length ) return true;
e.preventDefault();
if( e.keyCode == 27 ) quitLightbox();
if( e.keyCode == 37 || e.keyCode == 39 )
{
target = targets.eq( targets.index( target ) - ( e.keyCode == 37 ? 1 : -1 ) );
if( !target.length ) target = targets.eq( e.keyCode == 37 ? targets.length : 0 );
loadImage( e.keyCode == 37 ? 'left' : 'right' );
}
});
}
$( document ).on( 'click', this.selector, function( e )
{
if( !isTargetValid( this ) ) return true;
e.preventDefault();
if( inProgress ) return false;
inProgress = false;
if( options.onStart !== false ) options.onStart();
target = $( this );
loadImage();
});
this.each( function()
{
if( !isTargetValid( this ) ) return true;
targets = targets.add( $( this ) );
});
this.switchImageLightbox = function( index )
{
var tmpTarget = targets.eq( index );
if( tmpTarget.length )
{
var currentIndex = targets.index( target );
target = tmpTarget;
loadImage( index < currentIndex ? 'left' : 'right' );
}
return this;
};
this.quitImageLightbox = function()
{
quitLightbox();
return this;
};
return this;
};
})( jQuery, window, document );