css3 height transition not working

i have a problem using css3 transitions how can i make the transition smooth it appears instantly

i want the div box to slowly change its height when i hover over it

the html code

<div id="imgs">

<img src="http://chat.ecobytes.net/img/emoticons/smile.png" alt=":)" title=":)" />
<img src="http://chat.ecobytes.net/img/emoticons/sad.png" alt=":(" title=":(" />
<img src="http://chat.ecobytes.net/img/emoticons/wink.png" alt=";)" title=";)" />
<img src="http://chat.ecobytes.net/img/emoticons/razz.png" alt=":P" titl开发者_运维技巧e=":P" />
<img src="http://chat.ecobytes.net/img/emoticons/grin.png" alt=":D" title=":D" />
<img src="http://chat.ecobytes.net/img/emoticons/plain.png" alt=":|" title=":|" />
<img src="http://chat.ecobytes.net/img/emoticons/surprise.png" alt=":O" title=":O" />
<img src="http://chat.ecobytes.net/img/emoticons/confused.png" alt=":?" title=":?" />
<img src="http://chat.ecobytes.net/img/emoticons/glasses.png" alt="8)" title="8)" />
<img src="http://chat.ecobytes.net/img/emoticons/eek.png" alt="8o" title="8o" />
<img src="http://chat.ecobytes.net/img/emoticons/cool.png" alt="B)" title="B)" />
<img src="http://chat.ecobytes.net/img/emoticons/smile-big.png" alt=":-)" title=":-)" />

</div>

jsfiddle

---

I believe you need to set a specified height instead of auto. http://jsfiddle.net/BN4Ny/ this does a smooth expansion. Not sure if you wanted that little close open effect though. I just forked your jsfiddle and added a specified height.

---

This solution does not need javascript or have the problem of needing to have a fixed height for the container before hand.

This is made possible by using max-height property and setting its value to a high value.

#imgs {
    border:1px solid #000;
    border-radius:3px;
    max-height:20px;
    width:100%;
    overflow:hidden;
    transition: 2s ease;
}
#imgs:hover {
    max-height:15em;
}

<div id="imgs">

  <img src="https://sslb.ulximg.com/image/405x405/artist/1346353449_4159240d68a922ee4ecdfd8e85d179c6.jpg/e96a72d63f272127d0b6d70c76fd3f61/1346353449_eminem.jpg" />
</div>

---

Instead of using a set height on a container or using JS (which are both awkward solutions)... You can put the images in list items and work your transition on the li.

If all the images are going to a similar height it means your content inside the container can still be dynamic. For example...

/*
CLOSED
*/

div.container li 

{  height:0px;

-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-ms-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;}

/*
OPEN
*/

div.container:hover li 

{  height:30px;

-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-ms-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;}

---

Here's how you can do it: http://jsfiddle.net/minitech/hTzt4/

To keep a flexible height, JavaScript is a necessity, unfortunately.

---

well I'm using this method: use max height to transition height instead of the height directly... for example:

div {
     height: auto;
     max-height:0;
 }

   .toggle-above-div:hover div {
    max-height:0;
  }