javascript - div width adjusting to 100% if another div is hidden -


how set width of #leftdiv 100% when #rightdiv hidden, , when button clicked, both div should next each other.

i got both div's next each other on on button click, wanted expand #leftdiv 100% when #rightdiv hidden.

	function togglesidebar() {  		  		var div = document.getelementbyid('rightdiv');  		if (div.style.display !== 'none') {  			div.style.display = 'none';  		}  		else {  			div.style.display = 'block';  		}  		  	};
#leftdiv  {     border: solid medium thick;     float: left;     display: inline-block;     background-color: #ffc;     /*border: 1px solid red;*/  }    #rightdiv  {     width: 50%;     border: solid medium thick;     background-color: #ffa;     display: none;     float:right;  }
<input type="button" id="btn" value="toggle" onclick="togglesidebar()" />      <div id="main-content">          <div id="leftdiv">selectable</div>          <div id="rightdiv">right panel</div>      </div>`

it works without manipulating width via javascript if format them table-cells:

function togglesidebar() {      var div = document.getelementbyid('rightdiv');  	if (div.style.display !== 'none') {  	    div.style.display = 'none';  	} else {  		div.style.display = 'table-cell';  	}	  };
#leftdiv {  	border: solid medium thick;      width: auto;  	display: table-cell;      background-color: #ffc;  }    #rightdiv {      width: 50%;      border: solid medium thick;      background-color: #ffa;      display: none;  }    #main-content {      display:table;      width: 100%;  }
<input type="button" id="btn" value="toggle" onclick="togglesidebar()" />  <div id="main-content">      <div id="leftdiv">selectable</div>      <div id="rightdiv">right panel</div>  </div>`


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