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I made a slideshow with php and javascript and it slides the images just fine , but i'm a bit stuck at the back and forward functionalities and i would be grateful if you could help me a bit here.This is what i've done so far:
PHP:
$dir = 'images/slideshow';
$images = scandir($dir);
$i = 0;
echo '<div id="slideshow-wrapper">';
echo '<div id="slideshow-beta">';
foreach($images as $img){
if ($img != '.' && $img != '..') {
$i++;
echo '<img src="../images/slideshow/'.$img.'" class="img_'.$i.'">';
}
}
echo '</div>';
echo '<div id="slideshow-controller">';
echo '<div class="left-arrow-div"><span class="left-arrow" onclick="SlideShow(-1);"></span></div>';
echo '<div class="right-arrow-div"><span class="right-arrow" onclick="SlideShow(1);"></span></div>';
echo '</div>';
echo '</div>';
Javascript:
var i=1;
var begin=true;
function SlideShow(x){
if(x==-1){
i--;
}else if(x==1){
i++;
}
var total=$('#slideshow-beta img').length;
for(var j=1;j<=total;j++){
if($('.img_'+j).css('display')!='none'){
begin=false;
break;
}else{
begin=true;
}
}
if(i>total){
i=1;
$('.img_'+total).fadeOut(1000,function(){
$('.img_'+i).fadeIn(1000);
});
}else if(begin){
$('.img_'+i).show();
}else if(!begin){
$('.img_'+(i-1)).fadeOut(1000,function(){
$('.img_'+i).fadeIn(1000);
});
}
setTimeout(function(){
i++;
SlideShow(x);
},5000);
}
HTML:
<body onload="SlideShow(false);">
As you can see i tried to make an onclick event to change the 'i' value on run , though the value is changed , the image is not . Maybe because pressing back/forward calls another instance of the function instead of overwriting it.I don't know for sure , i'm lost on this one.
Here's a fiddle
479
I've made a major overhaul, but the idea stays the same (fiddle):
Changes to CSS:
.left-arrow, .right-arrow {
cursor: pointer;
/** display: none **/
}
#slideshow-controller {
z-index: 2;
position: absolute;
/** added **/
opacity: 0;
transition: opacity 300ms ease-in;
/***********/
}
#slideshow-wrapper:hover > #slideshow-controller {
opacity: 1;
}
Changes to HTML (removed inline onClick):
<div class="left-arrow-div"><span class="left-arrow">Back</span>
</div>
<div class="right-arrow-div"><span class="right-arrow">Forward</span>
</div>
Javascript:
var i = 0;
var images = $('#slideshow-beta img'); // cache all images
var total = images.length;
var timeout;
/*** hide all images at the start ***/
images.each(function (index) {
$(this).css({
display: 'none'
});
});
/*** bind event handlers to arrows ***/
$('.left-arrow').click(function () {
SlideShow(-1);
});
$('.right-arrow').click(function () {
SlideShow(1);
});
/*** Start the slideshow on 1st image ***/
SlideShow(0);
function SlideShow(x) {
if (isNaN(x)) { // throw error if x is not a number
throw new Error("x must be a number");
}
clearTimeout(timeout); // clear previous timeout if any to prevent multiple timeouts running
var current = (total + i + x % total) % total; // get the current image index
$(images[i]).fadeOut(1000, function () { // fade out the previous
$(images[current]).fadeIn(1000); // fade in the current
});
i = current; // set i to be the current
timeout = setTimeout(function () { // cache the timeout identifier so we can clean it
SlideShow(1);
}, 5000);
}
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