html5 - How to set middle div height 100% depend upon Div A And Div B using css? -


enter image description here

  • i trying set 100% height of div b
  • div-a , div-b height not fix
  • div-a on top
  • div-b on bottom

you can use flex-direction: column this.

working example:

var header = document.getelementsbytagname('header')[0];  var main = document.getelementsbytagname('main')[0];  var footer = document.getelementsbytagname('footer')[0];  var input = document.getelementsbytagname('input')[0];    function changeheight() {  var newheight = document.getelementsbytagname('input')[0].value;    header.style.flex = '1 0 ' + newheight + 'px';  footer.style.flex = '1 0 ' + newheight + 'px';  main.style.height= 'calc(100vh - ' + (newheight * 2) + 'px)';  }    input.addeventlistener('change', changeheight, false);
body {  display: flex;  flex-direction: column;  margin: 0;  padding: 0;  }    header, footer {  flex: 1 0 100px;  color: rgb(255, 255, 255);  background-color: rgb(127, 127, 127);  }    header h2, footer h2 {  margin: 0;  padding: 0;  }    main {  height: calc(100vh - 200px);  overflow: hidden;  }    header, footer, main {  text-align: center;  }    input {  width: 50px;  margin: 24px;  }
<header><h2>header</h2></header>    <main>  <p>you can vertically resize <strong>header</strong> , <strong>footer</strong>.</p>    <form>  <fieldset>  <legend>resize height of header , footer</legend>  <input type="number" value="100" step="10" min="60" />  </fieldset>  </form>  </main>    <footer><h2>footer</h2></footer>


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