How do I change <textarea> attribute maxlength="" by using a form to submit the value

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<!DOCTYPE html>
   <html lang="en">
   <head>
       <meta charset="UTF-8">
       <meta http-equiv="X-UA-Compatible" content="IE=edge">
       <meta name="viewport" content="width=device-width, initial-scale=1.0">
       <title>Document</title>
   </head>
   <body>
       <textarea
          id="textarea"
          class="textarea"
          placeholder="Please write your text here..."
          maxlength=""
        ></textarea>

       <!-- input maxlength value -->
       <form id="myForm" action="">
           Change Max Length Value: <input type="text" name="maxLength"><br>

           <input type="button" onclick="myFunction()" value="Submit form">
       </form>

       <script>
           function myFunction() {
                   var element = document.getElementById("textarea");
                   element.setAttribute("maxlength", "1000");
                 //change the 1000 by input data in submit form.
               }
       </script>
   </body>
   </html>

What I have tried:

The code above is what I've tried.

Posted 3-Oct-22 8:31am

Darzee The Great

Updated 4-Oct-22 17:30pm

v2

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2 solutions

Solution 3

Thanks, Richard Deeming. This works

Posted 4-Oct-22 17:30pm

Darzee The Great

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Richard Deeming · Accepted Answer · 2022-10-03T23:31:00

To read the value from the input, you need to get a reference to it. For example:

JavaScript

function myFunction() {
	const maxLength = document.getElementsByName("maxLength")[0];
	const element = document.getElementById("textarea");
    element.maxLength = parseInt(maxLength.value, 10);
}

Demo[^]