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HTML | DOM Form Object

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  • Last Updated : 31 Aug, 2022
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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; 

html




<!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;

html




<!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;

html




<!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 12 and above
  • Safari
  • Opera

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