HTML DOM Input FileUpload required Property

HTML Web Development Front End Technology

The HTML DOM input FileUpload required property returns and modify the value of required attribute of a file upload input button in HTML.

Syntax

Following is the syntax −

1. Returning required

object.required

2. Modifying required

object.required = true|false

Example

Let us see an example of HTML DOM input file upload required property −

Live Demo

<!DOCTYPE html>
<html>
<head>
<title>HTML DOM file upload required Property</title>
<style>
   body{
      text-align:center;
   }
   .btn{
      display:block;
      margin:1rem auto;
      background-color:#db133a;
      color:#fff;
      border:1px solid #db133a;
      padding:0.5rem;
      border-radius:50px;
      width:20%;
   }
   .show-message{
      font-weight:bold;
      font-size:1.4rem;
      color:#ffc107;
   }
</style>
</head>
<body>
<h1>file upload required Property Example</h1>
<form id="form" method="post" action="">
<fieldset>
<legend >Form </legend>
<input type="file" required>
<input type="submit" class="btn" value="Submit Form" onclick="checkRequired()">
</fieldset>
</form>
<div class="show-message"></div>
<script>
   function checkRequired(){
      var fileBtn=document.querySelector("input[type='file']");
      if(fileBtn.value === ""){
         document.querySelector(".show-message").innerHTML = "Please Select a File!";
      }
   }
</script>
</body>
</html>