Currently, I am developing a website and looking to implement an image cycling feature, like a slideshow, that changes images while the user is actively on the page. Despite looking extensively, I have yet to come across any useful information on how to do this.
Has anyone successfully implemented this functionality using Rails and its supported Javascript frameworks?
If you're looking to add some dynamic movement to your website, consider trying out the jQuery cycle plugin! You can find more information about it here: http://malsup.com/jquery/cycle/. It seems like it could be a great fit for your needs.
Just an FYI, Rails doesn't have a specific JavaScript framework tied to it, even though it includes prototype by default.
I'm assuming that when you mention AJAX, you're not referring to standard AJAX. In the context of rotating images using AJAX, the process would involve generating the rotated image on the server side and sending it to the client, as AJAX involves making requests with JavaScript. </pedantic>
That being said, there are numerous JavaScript image rotator options available that can be found on Google.
EDIT: Ah, I see now. You were actually referring to cycling through images rather than physically rotating them 90º clockwise, correct?
I have been utilizing a straightforward function that doesn't rely on any framework or slide transitions, making it an excellent starting point for beginners.
function SlideShow( elem_id, hold_time )
{
this.elem = document.getElementById( elem_id );
this.slides = [];
this.num_slides = 0;
this.cur_slide = 1;
this.add_slide = function( image )
{
this.slides[ this.num_slides++ ] = image;
}
var self = this;
this.next_slide = function()
{
if ( self.num_slides > 1 )
{
self.elem.src = self.slides[ self.cur_slide++ ].src;
if ( self.cur_slide == self.num_slides )
self.cur_slide = 0;
}
}
setInterval( self.next_slide, hold_time )
}
The parameters required are the element_id of an img tag and the duration in milliseconds to display each slide.
The add_slide function accepts a JavaScript Image object.
The initial value of cur_slide is set to 1 because I preload the img tag with the first image.
In my implementation, I construct the slideshow within the window.onload method and ensure each Image adds itself to the slideshow upon loading.
Example (not tested):
window.onload = function() {
var slide_show = new SlideShow( "slide_image", 4000 )
{ var img = new Image();
img.onload = function(){ slide_show.add_slide(img); };
img.src="/images/slide1.jpg"; }
...
/* Repeat process for each image */
}
This method works well if the sequence of slides does not matter.
If you're looking to implement lasting changes on images, I have experience with this in a Rails project. We incorporated features like resizing, cropping, and rotating similar to what snipshot.com offers.
Technically, we utilized YUI for the user interface's resize and crop functionalities, while RMagick was used on the server to handle image processing and send the edited results back to the UI. YUI conveniently includes an imagecrop widget that made implementation easier.
We also explored the option of conducting a series of actions on the UI before submitting the final result for server-side processing, but concluded that this approach would not produce satisfactory outcomes.
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