How to change the shape of a textarea using JavaScript?

Difficulty Level : Expert
Last Updated : 31 Jul, 2019

In General, Textarea will be in the form of rectangular or square shapes, but here we will deal with Unusual shapes of textarea which means this textarea will not be regular shapes but editable.

Method 1:
In the first method, let’s see the irregular editable textarea created using CSS-shapes and content editable attribute when it is true.

Program 1:

<!DOCTYPE html>
<html>
  
<head>
    <style>
        div {
            top: 124px;
            margin-left: 150px;
            outline: none;
        }
          
        #parallelogram {
            color: white;
            font-weight: bold;
            width: 250px;
            height: 200px;
            transform: skew(20deg);
            background: #f00;
            overflow: hidden;
        }
          
        #eq-triangle {
            width: 300px;
            height: 0;
            border-bottom: 104px solid blue;
            /* 104 = 120 * 0.866 */
            border-left: 60px solid transparent;
            border-right: 60px solid transparent;
        }
          
        .circle {
            display: table-cell;
            padding: 40px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            font-size: 30px;
            color: #fff;
            line-height: 50px;
            text-align: center;
            background: #40a977;
            word-break: break-all;
            justify-content: center;
            overflow: hidden;
        }
    </style>
</head>
  
<body>
    <h1>Parallelogram Shaped TextArea</h1>
    <label>
        <h3>Enter Comments:</h3></label>
  
    <div id="parallelogram" 
         contenteditable="true">
      Enter the something...
  </div>
  
    <h1>eq-triangle shaped TextArea</h1>
    <label>
        <h3>Enter Comments:</h3></label>
  
    <div id="eq-triangle"
         contenteditable="true">
      Enter the something...
  </div>
  
    <h1>Circle shaped TextArea</h1>
    <label>
        <h3>Enter Comments:</h3></label>
  
    <div class="circle" 
         contenteditable="true">
      Enter the something...
  </div>
  
</body>
  
</html>

Output:

Method 2:
Change the shape of textarea using JavaScript. First get the element using id and then change the shape using style.transform = “skew(40deg)”;.

Program 2: Lets use javascript to create unusual textarea.

<!DOCTYPE html>
<html>
  
<head>
    <style>
        textarea {
            color: brown;
            font-weight: bold;
            width: 250px;
            height: 200px;
            background: #ff7;
            overflow: hidden;
        }
    </style>
</head>
  
<body>
    <center>
        <h1 style="color:green">
          GeeksforGeeks
      </h1>
        <textarea id="myP">
          Unusual shape of a textarea
      </textarea>
        <br>
        <button onclick="myFunction()">
          Try it
      </button>
  
        <p id="demo"></p>
  
        <script>
            function myFunction() {
                var x = document.getElementById(
                  "myP").style.transform = "skew(40deg)";
                document.getElementById("demo").innerHTML = x;
            }
        </script>
    </center>
</body>
  
</html>

Output:
Before:

After:

My Personal Notes

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How to change the shape of a textarea using JavaScript?