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Thread: javascript noob - in need of help! - image slider

  1. #1
    Join Date
    Oct 2012
    Posts
    12

    javascript noob - in need of help! - image slider

    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

  2. #2
    Join Date
    Oct 2010
    Location
    Versailles, France
    Posts
    1,290
    See the source of this schematic example

  3. #3
    Join Date
    Oct 2012
    Posts
    12
    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];
    }

  4. #4
    Join Date
    Oct 2010
    Location
    Versailles, France
    Posts
    1,290
    You do not need two functions for next and previous slide...

    Code:
    // 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
    Last edited by 007Julien; 12-10-2012 at 05:05 AM.

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