How to make image hover in css?

问题:

I want to change the image from normal to brighter when it's on hover, My code:

    <div class="nkhome">
        <a href="Home.html"><img src="Images/btnhome.png" /></a>
    </div>
.nkhome{
    margin-left:260px;
    top:170px;
    position:absolute;
    width:59px;
    height:59px;
}
.nkhome a img:hover {
    background:url(Images/btnhomeh.png);
    position:absolute;
    top:0px;
}

Why doesn't work the hover? When my mouse is on it, it shows the first image, not the hover image.

回答1:

You've got an a tag containing an img tag. That's your normal state. You then add a background-image as your hover state, and it's appearing in the background of your a tag - behind the img tag.

You should probably create a CSS sprite and use background positions, but this should get you started:

<div>
    <a href="home.html"></a>
</div>

div a {
    width:  59px;
    height: 59px;
    display: block;
    background-image: url('images/btnhome.png');
}

div a:hover {
    background-image: url('images/btnhomeh.png);
}

This A List Apart Article from 2004 is still relevant, and will give you some background about sprites, and why it's a good idea to use them instead of two different images. It's a lot better written than anything I could explain to you.

回答2:

Simply this, no extra div or JavaScript needed, just pure CSS (jsfiddle demo):

HTML

<a href="javascript:alert('Hello!')" class="changesImgOnHover">
    <img src="http://dummyimage.com/50x25/00f/ff0.png&text=Hello!" alt="Hello!">
</a>

CSS

.changesImgOnHover {
    display: inline-block; /* or just block */
    width: 50px;
    background: url('http://dummyimage.com/50x25/0f0/f00.png&text=Hello!') no-repeat;
}
.changesImgOnHover:hover img {
    visibility: hidden;
}

回答3:

You're setting the background of the image to another image. Which is fine, but the foreground (SRC attribute of the IMG) still overlays everything else.

.nkhome{
    margin-left:260px;
    top:170px;
    position:absolute;
}
.nkhome a {
    background:url(Images/btnhome.png);
    display:block; /* Necessary, since A is not a block element */
    width:59px;
    height:59px;
}
.nkhome a:hover {
    background:url(Images/btnhomeh.png);
}


<div class="nkhome">
    <a href="Home.html"></a>
</div>

回答4:

It will not work like this, put both images as background images:

.bg-img {
    background:url(images/yourImg.jpg) no-repeat 0 0;
}

.bg-img:hover {
    background:url(images/yourImg-1.jpg) no-repeat 0 0;
}

回答5:

Hi you should give parent position relative and child absolute and give to height or width to absolute class as like this

Css

  .nkhome{
    margin-left:260px;
    width:59px;
    height:59px;
    margin-top:170px;
    position:relative;
    z-index:0;
}
.nkhome a:hover img{
    opacity:0.0;
}
.nkhome a:hover{
  background:url('http://www.prelovac.com/vladimir/wp-content/uploads/2008/03/example.jpg');
    width:100px;
    height:100px;
    position:absolute;
    top:0;
    z-index:1;

}

HTML

 <div class="nkhome">
        <a href="Home.html"><img src="http://dummyimage.com/100/000/fff.jpg" /></a>
    </div>
​

Live demo http://jsfiddle.net/t5FEX/7/

---

or this

<div class="nkhome">
        <a href="Home.html"><img src="http://dummyimage.com/100/000/fff.jpg" onmouseover="this.src='http://www.prelovac.com/vladimir/wp-content/uploads/2008/03/example.jpg'" 
            onmouseout="this.src='http://dummyimage.com/100/000/fff.jpg'"
            /></a>
    </div>​

Live demo http://jsfiddle.net/t5FEX/9/

回答6:

Here are some easy to folow steps and a great on hover tutorial its the examples that you can "play" with and test live.

http://fivera.net/simple-cool-live-examples-image-hover-css-effect/

回答7:

Exact solution to your problem

You can change the image on hover by using content:url("YOUR-IMAGE-PATH");

For image hover use below line in your css:

img:hover

and to change the image on hover using the below config inside img:hover:

img:hover{
content:url("https://www.planwallpaper.com/static/images/9-credit-1.jpg");
}

回答8:

Make on class with this. And make 2 different images with the self width and height. Works in ie9.

See this link.

http://kyleschaeffer.com/development/pure-css-image-hover/

Also you can 2 differents images make and place in the self class name with in the hover the another images.

See example.

 .myButtonLink {
              margin-top: -5px;

    display: block;
    width: 45px;
    height: 39px;
    background: url('images/home1.png') bottom;
    text-indent: -99999px;
              margin-left:-17px;

              margin-right:-17px;

              margin-bottom: -5px;

              border-radius: 3px;
              -webkit-border-radius: 3px;           
}

.myButtonLink:hover {
    margin-top:  -5px;

    display: block;
    width: 45px;
    height: 39px;
              background: url('images/home2.png') bottom;
              text-indent: -99999px;
              margin-left:-17px;

              margin-right:-17px;

              margin-bottom: -20x;

              border-radius: 3px;
              -webkit-border-radius: 3px;
}