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使用Jquery构建灯箱时发生了一件有趣的事情。我设置了左右箭头按钮来移动列表,以便在最后一个孩子右箭头按钮从第一个孩子或第一个孩子开始,左箭头按钮移动到最后一个孩子。Jquery选择倒数第二个子女
发生什么事是我的左箭头按钮应该从第一个孩子移动到最后一个孩子,而是跳过最后一个孩子,并显示倒数第二个孩子的照片。我没有同样的问题,右箭头按钮从最后一个孩子移动到第一个孩子。另外,当我点击最后一个孩子的左箭头和console.log时,我得到了想要正确显示日志的图像,但覆盖图中的图像是倒数第二张图像。
<body>
<h1>Image Gallery</h1>
<ul id="imageGallery">
<li>
<a href="images/refferal_machine.png">
<img src="images/refferal_machine.png" width="100" alt="Refferal Machine By Matthew Spiel">
</a>
</li>
<li><a href="images/space-juice.png"><img src="images/space-juice.png" width="100" alt="Space Juice by Mat Helme"></a></li>
<li><a href="images/education.png"><img src="images/education.png" width="100" alt="Education by Chris Michel"></a></li>
<li><a href="images/copy_mcrepeatsalot.png"><img src="images/copy_mcrepeatsalot.png" width="100" alt="Wanted: Copy McRepeatsalot by Chris Michel"></a></li>
<li><a href="images/sebastian.png"><img src="images/sebastian.png" width="100" alt="Sebastian by Mat Helme"></a></li>
<li><a href="images/skill-polish.png"><img src="images/skill-polish.png" width="100" alt="Skill Polish by Chris Michel"></a></li>
<li><a href="images/chuck.png"><img src="images/chuck.png" width="100" alt="Chuck by Mat Helme"></a></li>
<li><a href="images/library.png"><img src="images/library.png" width="100" alt="Library by Tyson Rosage"></a></li>
<li><a href="images/boat.png"><img src="images/boat.png" width="100" alt="Boat by Griffin Moore"></a></li>
<li><a href="images/illustrator_foundations.png"><img src="images/illustrator_foundations.png" width="100" alt="Illustrator Foundations by Matthew Spiel"></a></li>
<li><a href="images/treehouse_shop.jpg"><img src="images/treehouse_shop.jpg" width="100" alt="Treehouse Shop by Eric Smith"></a></li>
</ul>
<script src="http://code.jquery.com/jquery-1.11.0.min.js" type="text/javascript" charset="utf-8"></script>
<script src="js/app.js" type="text/javascript" charset="utf-8"></script>
</body>
中的JavaScript:
var $overlay = $('<div id="overlay"></div>');
var $image = $('<img>');
var $caption = $('<p></p>');
var $arrowLeft = $('<button id="left" class="arrow">‹</button>');
var $arrowRight = $('<button id="right" class="arrow">›</button>');
var $exit = $('<button id="exit">X</button>');
//Add image to overlay
$overlay.append($image);
//Add buttons to overlay
$overlay.append($arrowRight);
$overlay.append($arrowLeft);
$overlay.append($exit);
//Add caption to overlay
$overlay.append($caption);
//Add overlay
$('body').append($overlay);
//Capture the click event on a link to an image
$('#imageGallery a').click(function(event) {
event.preventDefault();
var imageLocation = $(this).attr("href");
//Update overlay with the image linked in the link
$image.attr('src', imageLocation);
//Show the overlay
$overlay.show();
//Get child's alt atribute and set caption
var captionText = $(this).children('img').attr('alt');
$caption.text(captionText);
});
//When left arrow is clicked
$arrowLeft.click(function() {
$('#imageGallery li a img').each(function() {
var galleryImage = $(this);
if (galleryImage.attr('src') === $image.attr('src')) {
var li = galleryImage.parent().parent();
if (li.is(':first-child')) {
var gallery = li.parent();
var lastLi = gallery.children(':last-child');
var anchor = lastLi.children('a');
var image = anchor.children('img');
$image.attr('src', image.attr('src'));
console.log(lastLi);
} else {
var prevLi = li.prev();
var anchor = prevLi.children('a');
var image = anchor.children('img');
$image.attr('src', image.attr('src'));
return false;
}
}
});
});
//When right arrow is clicked
$arrowRight.click(function() {
$('#imageGallery li a img').each(function() {
var galleryImage = $(this);
if (galleryImage.attr('src') === $image.attr('src')) {
var li = galleryImage.parent().parent();
if (li.is(':last-child')) {
var gallery = li.parent();
var firstLi = gallery.children(':first-child');
var anchor = firstLi.children('a');
var image = anchor.children('img');
$image.attr('src', image.attr('src'));
} else {
var nextLi = li.next();
var anchor = nextLi.children('a');
var image = anchor.children('img');
$image.attr('src', image.attr('src'));
return false;
}
}
});
});
//When x button is clicked
$exit.click(function() {
//Hide the overlay
$overlay.hide();
});
我知道,我需要干的编程工作。但是,除此之外,image.attr('href')实际上与image.attr('src')完全相同。哪一个在哪里并不重要。在我所做的修订中,我改变了它,以便它在现在说src的地方说,所以当看着它时,人们不会看到它,并说“就这样,这是你的问题”。无论如何,我仍然遇到同样的问题。 –
@JohnCoolidge只是帮助调试,因为在Firefox中,图像不会使用'href'更改。我已经更新了问题的其余部分。 – bonesbrigade
我不是故意听起来像我不感激你的帮助。我做。我是JS和Jquery的新手,所以我需要了解很多关于DRY编程的知识。我会尽量把它们结合起来,但是我想在我摆弄太多之前先让它工作。 –