照片库的Javascript功能

Question

I'm building a static page where I have an image and 2 arrows (one on the left of the image and one on the right). By clicking the arrow another image would appear, like in a photo gallery. There's only 4 images in total, which I would keep in the site folder on my computer. Basically the arrows should allow the user to cycle between the images, by pressing the right arrow or the left arrow.

I have an array of images:

var imageArray = new Array();
imageArray[0] = new Image(); imageArray[0].src = 'image1.png';
imageArray[1] = new Image(); imageArray[1].src = 'image2.png';
imageArray[2] = new Image(); imgArray[2].src = 'image3.png';
imageArray[3] = new Image(); imageArray[3].src = 'image4.png';

And the two arrows:

<div id="apDiv1"style="display:none"><img src="arrow left.png" width="125" height="74" onClick="SOMETHING">/div>

<div id="apDiv2"style="display:none"><img src="arrow right.png" width="125" height="74" onClick="SOMETHING">/div

I want to make onClick to call a function that shows the next (or previous) image.

How can I do this? I though of a sort of toggle function but that would work poorly.

And also, can I set up a starting image like:

<div id="apDiv3"style="display:none"><img src="image1.png" width="200" height="200">/div>

Answer 1

TO Move Forward (Forward Click)

css:

.show {
    display: block;
}

.hide {
    display: none;
}

Now, suppose you have a parent div with all image divs like this

<div class='parent'>
    <div id='image-1' class='show'><img src="image1.png" width="200" height="200"></div>
    <div id='image-2' class='hide'><img src="image2.png" width="200" height="200"></div>
    <div id='image-3' class='hide'><img src="image3.png" width="200" height="200"></div>
    //and so on...
</div>

Javascript code:

onclick: function() {
    var images = $('.parent').find('div');
    for(var i = 0; i< images.length; i++) {
        if($(images[i]).hasClass('show')) {
            $(images[i]).removeClass('show');
            $(images[i]).addClass('hide');
            if(i === images.length -1) {
                $(images[0]).removeClass('hide');
                $(images[0]).addClass('show');
            } else {
                $(images[0]).removeClass('show');
                $(images[0]).addClass('hide');
            }
        }
    }
}

Similarly, implement for back arrow click

Hope this helps