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HTML | DOM Form Object

  • Last Updated : 31 Jan, 2019

The Form Object in HTML DOM is used to represent the HTML < form > element.
This tag is used to set or get the properties of < form > element. This element can be accessed by using getElementById() method.

Syntax:

document.getElementById("Form_ID");

This Form_ID is assigned to HTML < form > element.

Example-1: Returning “form id” using document.getElementById(“myForm”).id;




<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML DOM Form Object
    </title>
</head>
  
<body style="text-align:center;">
  
    <h1 style="color:green;">  
            GeeksForGeeks  
        </h1>
  
    <h2>DOM Form Object</h2>
  
    <form align="center" 
          id="myForm" 
          method="GET" 
          target="_blank"
          action="/action_page.php">
        First name:
        <br>
        <input type="text"
               name="fname" 
               placeholder="FName">
        <br>
        <br> Last name:
        <br>
        <input type="text" 
               name="lname" 
               placeholder="LName">
        <br>
        <br>
    </form>
    <button onclick="myGeeks()">
        Submit
    </button>
    <p id="Geek_p" 
       style="color:green; 
              font-size:30px;">
    </p>
  
    <script>
        function myGeeks() {
            // Accessing form element.
            var txt = document.getElementById(
              "myForm").id;
            
            document.getElementById(
              "Geek_p").innerHTML = txt;
        }
    </script>
</body>
  
</html>

Output



  • Before click on the button:
  • After click on the button:

Example-2: Returning the value of the target attribute in the form using document.getElementById(“Form_ID”).target;.




<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML DOM Form Object
    </title>
</head>
  
<body style="text-align:center;">
  
    <h1 style="color:green;">  
            GeeksForGeeks  
        </h1>
  
    <h2>DOM Form Object</h2>
  
    <form align="center" 
          id="myForm"
          method="GET" 
          target="_blank"
          action="/action_page.php">
        First name:
        <br>
        <input type="text"
               name="fname" 
               placeholder="FName">
        <br>
        <br> Last name:
        <br>
        <input type="text" 
               name="lname" 
               placeholder="LName">
        <br>
        <br>
    </form>
    <button onclick="myGeeks()">
        Submit
    </button>
    <p id="Geek_p" 
       style="color:green; 
              font-size:30px;">
    </p>
  
    <script>
        function myGeeks() {
            
            //  Accessing form.
            var txt = document.getElementById(
              "myForm").target;
            
            
            document.getElementById(
              "Geek_p").innerHTML = txt;
        }
    </script>
</body>
  
</html>

Output

  • Before click on the button:
  • After click on the button:

Example-3: Returning the number of elements in the form using document.getElementById(“Form_ID”).length;.




<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML DOM Form Object
    </title>
</head>
  
<body style="text-align:center;">
  
    <h1 style="color:green;">  
            GeeksForGeeks  
        </h1>
  
    <h2>DOM Form Object</h2>
  
    <form align="center"
          id="myForm" 
          method="GET" 
          target="_blank"
          action="/action_page.php">
        First name:
        <br>
        <input type="text"
               name="fname" 
               placeholder="FName">
        <br>
        <br> Last name:
        <br>
        <input type="text"
               name="lname" 
               placeholder="LName">
        <br>
        <br>
    </form>
    <button onclick="myGeeks()">
        Submit
    </button>
    <p id="Geek_p"
       style="color:green;
              font-size:30px;">
    </p>
  
    <script>
        function myGeeks() {
            
          //Accessing form element.
          var txt = document.getElementById(
            "myForm").length;
            
            document.getElementById(
              "Geek_p").innerHTML = txt;
        }
    </script>
</body>
  
</html>

Output

  • Before click on the button:
  • After click on the button:

Supported Browsers:

  • Google Chrome
  • Mozilla Firefox
  • Edge
  • Safari
  • Opera

Attention reader! Don’t stop learning now. Get hold of all the important HTML concepts with the Web Design for Beginners | HTML  course.




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