jquery - resize height of div with overflow -


please me css obtain 1 special visual effect. have container div contains 3 divs inside.
first div hidden;
second div button slide , down first div;
third div div overflow properties scroll information inside.

i not know how change/adjust height of div-3 when div-1 scrolling down - keep div-3 inside of div container. hope else faced such problem before , can recommend useful.

please have in jsfiddle in order see real example. thank time!

example

<div class="container">     <div class="updiv">header info</div> <div class="middle" onclick="uparrow()">button , down</div>     <div class="bottomdiv">         <div class="block">111</div>         <div class="block">222</div>        <div class="block">333</div>         <div class="block">444</div>      </div> </div>

css

.container{   width:400px;   height:400px;   border:1px solid red;   position: relative;    } .updiv{  display:none;  width:392px;  height:100px;   margin:3px;  border:1px solid blue;  background:yellow;    } .middle{ margin:3px;  width:392px;  height:30px;  background:green;  color:white;  text-align:center;    } .block{  width:100%;  height:100px;     background:pink;  margin-bottom:20px;    } .bottomdiv{ overflow-y: scroll;  margin:3px; width:392px; height:350px; display:block; border:1px solid blue;         }

script

 function uparrow(){  $('.updiv').slidetoggle();  }

you gave parent container fixed height of 400px, means problem you're forcing have height no matter what, just remove it.


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