How to Get all Textarea in a Form using JavaScript

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In JavaScript, you can use the getElementByTagName() method to get elements with a given tag name. This makes it easy to get all elements of a specific type in a form. Here, I’ll show how to get all the textarea elements only in a form using this method.

Syntax getElementByTagName()

document.getElementByTagName(tagname);

The method takes a string parameter as tagname. For example, getElementByTagName('textarea') for textarea elements or getElementByTagName('input'), in case you want to get all input boxes from your web form.

Note: The method’s parameter is not case sensitive. That is, it can be textarea or Textarea. However, just make sure that you pass the string parameter (the tag name) as it is.

Let’s see an example. Here’s my form with few textarea elements.

The Markup
<body>
  <div>
    <!--I have three textarea elements.-->
    <ul>
      <li><textarea id="a1"></textarea></li>
    </ul>
    <ul>
      <li><textarea id="a2"></textarea></li>
    </ul>
    <ul>
      <li><textarea id="a3"></textarea></li>
    </ul>
  </div>

  <p>
    <input type="text" id="txt1" placeholder='Enter your name'>
    <input type="button" id="bt1" value='Submit' onclick='getTArea()'>
  </p>
</body>

Along with textarea, I have two input boxes of type text and button. I only want to extract the textareas and its values.

The Script
<script>
let getTArea = () => {
    
    const ele = document.getElementsByTagName('textarea');

    for (let i = 0; i <= ele.length - 1; i++) {
      if (ele[i].value != '')
      	alert (ele[i].value);
      else {
      	alert ('Enter some value in textarea');
        return false;
      }
    }
}
</script>
Try it

The getElementsByTagName() method will return an HTMLCollection of elements with the <textarea> tag. See this result in your browser’s console window.

let ele = document.getElementsByTagName('textarea');
console.log(ele);

Get all Textarea Elements using JavaScript

Finally, you can loop through each element and get the values from it. I have used a for loop in the above example to extract values from the elements. You may also use this method …

for (let el of ele) {
   console.log (el);  
   // or
  console.log (el.value);  
}

👉 Now you can quickly convert all textarea data in a web form into PDF using JavaScript.
Convert textarea data into PDF in JavaScript

Thanks for reading.

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