Difference between revisions of "Image slider"
(update) |
m |
||
| Line 142: | Line 142: | ||
// Initialise the table's images to first image with zero offset | // Initialise the table's images to first image with zero offset | ||
| − | + | image_slider( window.currentslider, 0 ); | |
| − | |||
}); | }); | ||
| − | |||
| − | + | function image_slider( slider, dir ) { | |
| − | + | // Set the new image and animate to it (bail if already animating) | |
| − | + | var data = window.sliderdata[slider]; | |
| − | + | if( data.dir ) return; | |
| − | + | data.image += dir; | |
| − | + | data.dir = dir; | |
| − | + | // Show next image on regular interval | |
| − | + | if( 'timer' in data ) clearTimeout(data.timer); | |
| − | + | data.timer = setTimeout('window.image_slider(' + slider + ',1)', window.sliderdelay * 1000); | |
| − | + | // Play an animation from the current image to the next | |
| − | + | data.div.animate({ t: 1 }, { | |
| − | + | duration: 1000, | |
| − | + | step: function(now, fx) { | |
| − | + | var div = $(fx.elem); | |
| − | + | var data = window.sliderdata[div.attr('id')]; | |
| − | + | // Get the URLs for the current and next image | |
| − | + | var l = data.images.length; | |
| − | + | var image = data.image; | |
| − | + | image += l * 1000000; | |
| − | + | var next = ( image - dir ) % l; | |
| − | + | image %= l; | |
| − | + | var offset = -data.dir * fx.pos * data.w; | |
| − | + | // Set the URL and position for the current image | |
| − | + | $('th', div).css('background', 'transparent url("' | |
| − | + | + data.images[image] | |
| − | + | + '") no-repeat ' | |
| − | + | + (offset + data.w * dir) | |
| − | + | + 'px center' | |
| − | + | ); | |
| − | + | // Set the URL and position for the next image | |
| − | + | $('td', div).css('background', 'transparent url("' | |
| − | + | + data.images[next]+'") no-repeat ' | |
| − | + | + offset | |
| − | + | + 'px center' | |
| − | + | ); | |
| − | + | }, | |
| − | + | complete: function(now, fx) { | |
| − | + | var data = window.sliderdata[$(this).attr('id')]; | |
| − | + | data.dir = 0; // mark current slider as no longer animating | |
| − | } | + | } |
| − | } | + | }); |
| − | }; | + | }; |
| + | }); | ||
</js> | </js> | ||
Revision as of 20:52, 27 March 2015
Here's a simple image slider written 100% in JavaScript and jQuery. In converts any div elements of class "image-slider" containing img elements in a slider like the one below. The code is shown below the example.
The code
<js> window.sliderdata = []; window.sliderdelay = 5; $(document).ready( function() {
$('div.image-slider').each( function() { var div = $(this);
// Create entry in common data for this slider window.currentslider = window.sliderdata.length; div.attr('id', window.currentslider); var slider = { image: 0, dir: 0, images:[], div: div }; window.sliderdata.push(slider);
// Store the image urls found in this slider in this sliders data and preload them $('img', div).css('display','none').each( function() { var src = $(this).attr('src'); var image = $('<img />').attr('src', src); window.sliderdata[currentslider].images.push( src ); window.sliderdata[currentslider].w = $(this).attr('width'); window.sliderdata[currentslider].h = $(this).attr('height'); });
// Restructure the content of this sliders div into a table with prev/next buttons var prev = '<a class="is-prev" href="javascript:window.image_slider(' + window.currentslider + ',-1)">< prev</a>'; var next = '<a class="is-next" href="javascript:window.image_slider(' + window.currentslider + ',1)">next ></a>';
div.html( '
|
|---|
' );
// Set the cell size to the image size and other css styles $('table',div).css({ background: 'transparent', width: slider.w, height: slider.h, 'border-collapse': 'collapse' }); $('td,th',div).css({ padding: 0, 'vertical-align': 'middle' }); $('.is-prev',div).css({ float: 'left' }); $('.is-next',div).css({ float: 'right' });
// Initialise the table's images to first image with zero offset image_slider( window.currentslider, 0 ); });
function image_slider( slider, dir ) {
// Set the new image and animate to it (bail if already animating) var data = window.sliderdata[slider]; if( data.dir ) return; data.image += dir; data.dir = dir;
// Show next image on regular interval if( 'timer' in data ) clearTimeout(data.timer); data.timer = setTimeout('window.image_slider(' + slider + ',1)', window.sliderdelay * 1000);
// Play an animation from the current image to the next data.div.animate({ t: 1 }, { duration: 1000, step: function(now, fx) { var div = $(fx.elem); var data = window.sliderdata[div.attr('id')];
// Get the URLs for the current and next image var l = data.images.length; var image = data.image; image += l * 1000000; var next = ( image - dir ) % l; image %= l; var offset = -data.dir * fx.pos * data.w;
// Set the URL and position for the current image $('th', div).css('background', 'transparent url("' + data.images[image] + '") no-repeat ' + (offset + data.w * dir) + 'px center' );
// Set the URL and position for the next image $('td', div).css('background', 'transparent url("' + data.images[next]+'") no-repeat ' + offset + 'px center' ); }, complete: function(now, fx) { var data = window.sliderdata[$(this).attr('id')]; data.dir = 0; // mark current slider as no longer animating } }); }; }); </js>
