Callbacks, callbacks, callbacks.
JS does alot of things async, so you will need to make use of a callback on that fadein.
$(ITEM1).fadeOut("fast", function() {
alert("all the way faded out");
$(ITEM2).fadeIn("fast");
});
Domanda
I have made this minimal test jsfiddle to show images and navigate with thumbnails, next and previous and also run as a slideshow.
It seems to be working OK, except that I can not get the current displayed image to fadeOut prior to the fadeIn of the next image.
Initially all the images were placed in a stack in the #holder DIV and then FadeIn and FadeOut worked as I expected, but I need to have the images in an array and load as required, because there will be several different values, associated with each image.
I probably have made some fundamental mistake or I do not understand how FadeIn and FadeOut properly work, as I am not an expert in javascript and jquery and I just get by, by looking at examples on here and similar sites.
I suspect I may need to somehow force a delay before loading the next image, but I can not work out how to do that.
Thanks
<style type='text/css'>
#holder { position: absolute; top: 100px; background-color:#CCCCCC;
width: 300px; height: 200px;
}
.slides { position: relative; top: 0px;
display: none;
}
#thumbs li
{
display: inline;
list-style-type: none;
padding-right: 6px;
}
</style>
<script type='text/javascript'>//<![CDATA[
$(window).load(function(){
// define Global Vars
var timerON = null;
var files = [
["http://dummyimage.com/300x200/000/fff&text=Array-01", "http://dummyimage.com/40x40/000/fff&text=01","Title-01"] ,
["http://dummyimage.com/300x200/000/fff&text=Array-02", "http://dummyimage.com/40x40/000/fff&text=02","Title-02"] ,
["http://dummyimage.com/300x200/000/fff&text=Array-03", "http://dummyimage.com/40x40/000/fff&text=03","Title-03"] ,
["http://dummyimage.com/300x200/000/fff&text=Array-04", "http://dummyimage.com/40x40/000/fff&text=04","Title-04"] ,
["http://dummyimage.com/300x200/000/fff&text=Array-05", "http://dummyimage.com/40x40/000/fff&text=05","Title-05"] ,
["http://dummyimage.com/300x200/000/fff&text=Array-06", "http://dummyimage.com/40x40/000/fff&text=06","Title-06"] ,
["http://dummyimage.com/300x200/000/fff&text=Array-07", "http://dummyimage.com/40x40/000/fff&text=07","Title-07"]
]
var numImages = files.length;
// initial routines
showImage(1);
buildThumbs();
function showImage(num) {
//$('#holder img').fadeOut();
if ( $('#holder img').length > 0 ) { // fadeout existing
$("#holder img").fadeOut(700);
//alert("Faded OUT");
}
$("#holder").html('<img id="' + num + '" src="' + files[num-1][0] + '" style="display:none;"' + '" />');
$("#holder img").fadeIn(700);
//alert("Faded IN");
}
function buildThumbs() {
var thumbs = "";
for (cnt=0; cnt<files.length; cnt++) {
thumbs += '<li><a href="#" id="' + (cnt + 1) + '"><img src="' + files[cnt][1] + '" /></li>';
}
$('#thumbs').html(thumbs);
}
// Initialise routines for acting on click events
$(document).ready(function() {
$('#prev').click( function () {
var currImage = parseInt($('#holder img:visible').attr("id"));
if (currImage == 1) {
// at first position
}
else {
showImage(currImage-1); }
});
$('#next').click( function () {
var currImage = parseInt($('#holder img:visible').attr("id"));
if (currImage == numImages) {
// at last position
}
else {
showImage(currImage+1);
}
});
$('#thumbs a').click( function () {
var selImage = parseInt($(this).attr('id'));
var currImage = parseInt($('#holder img:visible').attr("id"));
showImage(selImage);
});
$('#slideShowBtn').click( function () {
slideShowCheck();
});
});
function slideShowCheck() {
if(timerON != null) {
clearTimeout(timerON);
timerON = null;
$('#slideShowBtn').text('Play Slideshow');
} else {
$('#slideShowBtn').text('Stop Slideshow');
slideShow();
}
}
function slideShow() {
var nextImage = 0;
var currImage = parseInt($('#holder img:visible').attr("id"));
if (currImage == numImages) {
nextImage = 1;
} else {
nextImage = currImage + 1;
}
showImage(nextImage);
timerON = setTimeout(slideShow, 3000);
}
});//]]>
</script>
</head>
<body>
<p>
<button id="prev">« Prev</button>
<button id="next">Next »</button>
</p>
<ul id="thumbs">
</ul>
<p>
<button id="slideShowBtn">Play Slideshow</button>
</p>
<div id="holder">
</div>
<div style="clear:both;"></div>
<ul id="thumbs2">
</ul>
</body>
</html>
Soluzione
JS does alot of things async, so you will need to make use of a callback on that fadein.
$(ITEM1).fadeOut("fast", function() {
alert("all the way faded out");
$(ITEM2).fadeIn("fast");
});