使用CSS和JQUERY在图像上显示标题

Question

I have the following jsfiddle but it doesnt seem to show the caption up: http://jsfiddle.net/KumcX/189/

HTML:

<ul>
<li>
    <div class="caption" style="width: 220px; height: 140px; display: block; opacity: 0.0524612;">this is my caption</div>
    <a href="#"><img src="http://dribbble.com/system/users/22122/screenshots/244072/empirestate02_d_teaser.png?1314126367" alt=""></a></li>
    <li>
    <div class="caption" style="width: 220px; height: 140px; display: block; opacity: 0.0524612;">this is my caption</div>
    <a href="#"><img src="http://dribbble.com/system/users/22122/screenshots/244072/empirestate02_d_teaser.png?1314126367" alt=""></a></li>
    <li>
    <div class="caption" style="width: 220px; height: 140px; display: block; opacity: 0.0524612;">this is my caption</div>
    <a href="#"><img src="http://dribbble.com/system/users/22122/screenshots/244072/empirestate02_d_teaser.png?1314126367" alt=""></a></li>
    <li>
    <div class="caption" style="width: 220px; height: 140px; display: block; opacity: 0.0524612;">this is my caption</div>
    <a href="#"><img src="http://dribbble.com/system/users/22122/screenshots/244072/empirestate02_d_teaser.png?1314126367" alt=""></a></li>
    <li>
    <div class="caption" style="width: 220px; height: 140px; display: block; opacity: 0.0524612;">this is my caption</div>
    <a href="#"><img src="http://dribbble.com/system/users/22122/screenshots/244072/empirestate02_d_teaser.png?1314126367" alt=""></a></li>
    <li>
    <div class="caption" style="width: 220px; height: 140px; display: block; opacity: 0.0524612;">this is my caption</div>
    <a href="#"><img src="http://dribbble.com/system/users/22122/screenshots/244072/empirestate02_d_teaser.png?1314126367" alt=""></a></li>
</ul>

CSS:

ul li{ float:left; padding:20px; border:solid gray 4px; margin:5px;}
ul li div{display:none; background:white; opacity:.5; position:absolute;}

JS:

$('ul li').mouseenter(function(){
    var image= $(this).find('a img'),
        caption = $(this).find('div');

    caption.width(image.width());
    caption.height(image.height());
    caption.fadeIn();
}).mouseleave(function(){
     var image= $(this).find('img'),
        caption = $(this).find('div');

    caption.width(image.width());
    caption.height(image.height());
    caption.fadeOut();
});

It should show the caption, but its not.. Any ideas?

Answer 1

You probably copy the html with firebug,

delete the styles on the li elements.

check this http://jsfiddle.net/kuyabiye/KumcX/194/

Answer 2

Refactored some of the JS, ditched the inline caption styling, and updated the css class

jQuery

$(".caption").css('opacity', 0);

$('ul li').mouseenter(function() {    
    $(this).find(".caption").animate({ 'opacity': 0.9 });
}).mouseleave(function() {
    $(this).find(".caption").animate({ 'opacity': 0 });
});​

css

ul li {
    float:left; 
    padding:20px; 
    border:solid gray 4px; 
    margin:5px;
}
.caption {
    width: 220px;
    background: #fff; 
    height: 150px;        
    position: absolute;
}​​​

example : http://jsfiddle.net/hunter/KumcX/201/

Answer 3

Use animate effect, configuring opacity:

$('ul li').mouseenter(function(){
    var image= $(this).find('a img'),
        caption = $(this).find('div');

    caption.width(image.width());
    caption.height(image.height());
    caption.animate({'opacity':0.5});
}).mouseleave(function(){
    var image= $(this).find('img'),
        caption = $(this).find('div');

    caption.width(image.width());
    caption.height(image.height());
    caption.animate({'opacity':0});
});

Answer 4

Just a couple of tweaks needed, first of all in your CSS you need to give your <div> a left and top position as well as some height and width which I've set to 100% to span the image and your <li> a position relative so the caption is nicely positioned over the image. Oh I also gave the <div> background an rgba color of 255,255,255,0.5 to achieve your transparent effect.

Your JS is fine but your problem in the fiddle is that you have lots of inline styles so delete those and everything should work ok from then on in.

Here's an updated fiddle: http://jsfiddle.net/KumcX/197/

And the updated CSS:

ul li{ float:left; padding:20px; border:solid gray 4px; margin:5px;position:relative}
ul li div{display:none; background:rgba(255,255,255,.5); position:absolute;left:0;top:0;width:100%;height:100%;}

​Hope this helps.