javascript noob - in need of help! - image slider

[dave251]

hi all,
Now I am not quite sure if an image slider would even be the proper term for what I need help with, so pardon me if it isn't. However, I am in desperate need of help. I need to be done with my course in a couple of weeks and still got three units to do. So, for my one unit I have to make a pure javascript image slider(no libraries or anything... the point is to just use plain javascript), yet I am completely confused on how to do this.

I gotta make a slider that will continuously change pictures and I also need to add an event for mouse over/mouse out so it freezes and then keeps going. It also needs previous and next button and or a form of navigating through the different ones without having to wait for it to show up. I tried using an array and a for loop to cycle through it, but then I realized I would be able to make it loop on for ever that way it will stop at "array.length". My main concerns are: setInterval(), how to loop through them, and do you create/remove image elements as you go or how do you do that? Any help would be awesome.

Thanks a lot in advance

[007Julien]

See the source of this schematic example

[dave251]

Thanks I gave it a look and I started writing one. However, I got stuck making a recursive call in my script(maybe I need to do something else I dont no?), anyways if you could take a look at my code and see whats wrong with it. I so far have a previous, next, play, and hopefully soon a stop button. Yet, I can't seem to get my slideshow to keep playing. It goes through is once and then stops??

here is the code...


var images = new Array();
images[0] = "http://www.carpages.co.uk/guide/@images/skoda/skoda-octavia.jpg";
images[1] = "http://image.automotive.com/f/reviews/driven/11352663+pheader/0812_01_z+2009_volkswagen_jetta_tDI+front_three_quarter_view.jpg";
images[2] = "http://www.carautoportal.com/car-images/audi/audi-r8-car.jpg";
images[3] = "http://www.roadfly.com/new-cars/wp-content/uploads/gallery/2008-mercedes-benz-c-class/2008-mercedes-benz-C350-sport.jpg";
images[4] = "http://www.w3schools.com/images/compatible_ie.gif";

var currentSlide = 0;
var totalSlides = images.length;
var firstSlide = 0;

function recursive(){
setTimeout(function(){playSlide();}, 3000);
}

function playSlide(){
if(currentSlide == totalSlides - 1){
currentSlide = firstSlide;
}else{
currentSlide++;
setTimeout(function(){recursive();}, 3000);
}
//console.log(images[currentSlide]);
document.getElementById("slide").src = images[currentSlide];
}

playSlide();

function nextSlide(){
if(currentSlide == totalSlides - 1){
currentSlide = firstSlide;
}else{
currentSlide++;
}
//console.log(images[currentSlide]);
document.getElementById("slide").src = images[currentSlide];
}

function prevSlide(){
if(currentSlide == firstSlide){
currentSlide = totalSlides - 1;
}else{
currentSlide--;
}
//console.log(images[currentSlide]);
document.getElementById("slide").src = images[currentSlide];
}

[007Julien]

You do not need two functions for next and previous slide...

// Image's definition 
var currentSlide = 0;
var totalSlides = images.length;

// An unique function with a delta +1 or -1
function followingSlide(delta){
	currentSlide+= (totalSlides+delta)%totalSlides;
	document.getElementById("slide").src = images[currentSlide];
}

Then store the setTimeout with a global var to use clearTimeout...

Good Luck