CSS/JS調整大小以適應圖像大小

Question

我嘗試了一點點過渡，並希望顯示一個圖像的標題：懸停。這是我現在：
（我試圖調整數字本身與圖像的大小）

//Resize figure to image size 
 
$(document).ready(function() { 
 
    $("figure>img").load(function() { 
 
    $(this).parent().width($(this).width()); 
 
    }); 
 
});

figure { 
 
    display: table; 
 
    position: relative; 
 
    overflow: hidden; 
 
} 
 
figcaption { 
 
    position: absolute; 
 
    background: rgba(0, 0, 0, 0.75); 
 
    color: white; 
 
    padding: 10px 20px; 
 
    opacity: 0; 
 
    /* unvisible to fade in later */ 
 
    bottom: 0; 
 
    left: 0; 
 
    display: none; 
 
    /* unvisible to fade in later */ 
 
    -webkit-transition: all 0.6s ease; 
 
    -moz-transition: all 0.6s ease; 
 
    -o-transition: all 0.6s ease; 
 
} 
 
figure:hover figcaption { 
 
    opacity: 1; 
 
    /* visible */ 
 
    left: 0; 
 
    display: inline-block; 
 
    /* visible */ 
 
} 
 
.img-middle { 
 
    height: 60%; 
 
    width: 60%; 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<figure> 
 
    <img class="img-middle" src="img/test.png" alt="" width="700" height="500"></img> 
 
    <figcaption>This is a cool caption</figcaption> 
 
</figure>

這個數字從來就沒有調整。
現在的問題是，該數字以某種方式具有100％的寬度，因此:hover效果也會觸發圖像旁邊的某處。我不想手動設置圖形的大小。當我試圖figure>img:hover figcaption { /* do stuff */ }（爲了只在圖像懸停時觸發字幕褪色），它以某種方式不再工作。
所以，因爲不要爲我工作，我試圖根據其兒童大小來調整父...

Answer 1

這就是你所追求的？

figcaption { 
 
    position: absolute; 
 
    display: block; 
 
    background: rgba(0, 0, 0, 0.75); 
 
    color: white; 
 
    height: 100%; 
 
    overflow: hidden; 
 
    width: 0; 
 
    /* unvisible to fade in later */ 
 
    top: 0; 
 
    left: 0; 
 
    /* unvisible to fade in later */ 
 
    -webkit-transition: all 0.6s ease; 
 
    -moz-transition: all 0.6s ease; 
 
    -o-transition: all 0.6s ease; 
 
    text-overflow: ellipsis; 
 
    white-space: nowrap; 
 
} 
 
figure { 
 
    display: table; 
 
    position: relative; 
 
    overflow: hidden; 
 
    border: 1px solid; 
 
    /** 
 
    * only an example 
 
    */ 
 
    width: 500px; 
 
    height: 100px; 
 
} 
 
figure img { 
 
    display: block; 
 
    width: 100%%; 
 
    height: 100%; 
 
} 
 
figure > .image-container { 
 
    width: auto; 
 
    display: block; 
 
    width: 80%; 
 
    margin: 0 auto; 
 
} 
 
figure > .image-container:hover { 
 
    width: 100%; 
 
} 
 
figure > .image-container:hover figcaption { 
 
    padding: 10px 20px; 
 
    width: 100%; 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<figure> 
 
    <div class="image-container"> 
 
    <img class="img-middle" src="http://lorempixel.com/400/200/" alt="" width="100%" /> 
 
    <figcaption>This is a cool caption</figcaption> 
 
    </div> 
 
</figure>