javascript - Calculating height of absolute positioned nested childs -

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i've stuck @ problem 

.autoheightparent {    width: 500px; /* example */    position: relative;  }   .absoluteposchild {    /* absolute required make pretty drag , drop transitions interpolating left property */    position: absolute;     display:flex;    flex-direction: column;    border: 1px solid green;  }  .absoluteposchild div {    width: 100%;  }
<div class="autoheightparent" style="height:170px;">    <div class="absoluteposchild" style="left: 0px; width: 100px;">      <div>        child content      </div>    </div>    <div class="absoluteposchild" style="left: 100px; width: 150px;">      <div>        child content nesting      </div>      <!-- !! nesting  -->      <div class="autoheightparent">        <div class="absoluteposchild" style="left: 0px; width: 50px;">          <div>            don't know height          </div>        </div>        <div class="absoluteposchild" style="left: 50px; width: 100px;">          <div>            g.child 2          </div>        </div>      </div>    </div>  </div>  <div style="border: 1px solid red">  need automatcally calculate height of box above make box right after it. can see hardcoded 170px height.  </div>

how guys solve problems this?

i have tried solve javscript solution looks wrong. 

function setrootheight() {    var root = document.getelementbyid("root");    var allchilds = root.getelementsbytagname("*");    var rootrect = root.getboundingclientrect();    var maxchildheight = 0;    _.each(allchilds, function(item) {      var noderect = item.getboundingclientrect();      var nodeheightrelativetoroot = ( noderect.top + noderect.height ) - rootrect.top;      if ( nodeheightrelativetoroot > maxchildheight) maxchildheight = nodeheightrelativetoroot;    });    root.style.height = maxchildheight + "px";  }    setinterval(setrootheight, 300);
.autoheightparent {    width: 500px; /* example */    position: relative;  }   .absoluteposchild {    /* absolute required make pretty drag , drop transitions interpolating left property */    position: absolute;     display:flex;    flex-direction: column;    border: 1px solid green;  }  .absoluteposchild div {    width: 100%;  }
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/1.2.1/lodash.min.js"></script>  test content above  <div id="root" class="autoheightparent">    <div class="absoluteposchild" style="left: 0px; width: 100px;">      <div>        child content      </div>    </div>    <div class="absoluteposchild" style="left: 100px; width: 150px;">      <div>        child content nesting      </div>      <!-- !! nesting  -->      <div class="autoheightparent">        <div class="absoluteposchild" style="left: 0px; width: 50px;">          <div>            don't know height          </div>        </div>        <div class="absoluteposchild" style="left: 50px; width: 100px;">          <div>            g.child 2          </div>        </div>      </div>    </div>  </div>  <div style="border: 1px solid red">  visualization of height calculated  </div>

it uses setinteval check if of nested children changed it's height , recalculate height of parent box. need find better solution because of performance , code beauty.

snippets simplified compared real recalculations.

i free use flexbox or tool can solve this

i've solved issue relative positioning.

for complex "absolute position" animations made function translates absolute relative.

for example 

.autoheightparent {    width: 500px; /* example */    position: relative;    display: flex;  }   .absoluteposchild {    /* relative position here must absolutes' job here */    position: relative;     display:flex;    flex-direction: column;    border: 1px solid green;  }  .absoluteposchild div {    width: 100%;  }
<!doctype html>  <html>  <head>    <meta charset="utf-8">    <meta name="viewport" content="width=device-width">    <title>js bin</title>  </head>  <body>    <div class="autoheightparent">    <div class="absoluteposchild">      <div>        child content      </div>    </div>    <div class="absoluteposchild">      <div>        child content nesting      </div>      <!-- !! nesting  -->      <div class="autoheightparent">        <div class="absoluteposchild">          <div>            don't know height          </div>        </div>        <div class="absoluteposchild">          <div>            g.child 2          </div>        </div>      </div>    </div>  </div>    </body>  </html>

you see parent box automatically resizes fine. can use translate3d child , parent box keeps it's size , position.


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