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HTML | DOM Form length Property

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  • Last Updated : 31 Aug, 2022
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The DOM Form length Property is used to return the number of input field contained in the form. 

Syntax: 

formObject.length

Return Value: It returns a numeric value which represent the number of input field or elements in the Form. 

Example-1: Return the number of input field. 

html




<!DOCTYPE html>
<html>
 
<body style="text-align:center;">
    <h1 style="color:green;">
      GeeksForGeeks
  </h1>
   
    <h2>DOM Form length Property.
  </h2>
   
    <form id="users"
          action="#">
        First name:
       
        <input type="text"
               name="fname"
               value="Manas">
        <br> Last name:
       
        <input type="text"
               name="lname"
               value="Chhabra">
        <br>
       
        <input type="submit"
               value="Submit">
    </form>
 
    <p>Click the "Try it" button to return
      the number of elements contained in the form.</p>
 
    <button onclick="myGeeks()">
      Try it
  </button>
 
    <p id="sudo"
       style="font-size:25px;color:green;">
  </p>
 
    <script>
        function myGeeks() {
           
            // Return the number of input field
            var x =
                document.getElementById(
                  "users").length;
           
            document.getElementById("sudo").innerHTML =
              "There are " + x +
              " Input Field contained by the form.";
        }
    </script>
 
</body>
 
</html>

Output : Before Clicking On Button :  

After Clicking On Button :

  

Example-2: Return the value of input field. 

html




<!DOCTYPE html>
<html>
 
<body style="text-align:center;">
    <h1 style="color:green;">
      GeeksForGeeks
  </h1>
   
    <h2>DOM Form length Property.</h2>
    <form id="users"
          action="#">
        First name:
       
        <input type="text"
               name="fname"
               value="Manas">
        <br> Last name:
       
        <input type="text"
               name="lname"
               value="Chhabra">
        <br>
       
        <input type="submit"
               value="Submit">
    </form>
 
    <p>Click the "Try it" button to return
      the value of each input field or element
      contained in the form.</p>
 
    <button onclick="myGeeks()">Try it</button>
 
    <p id="sudo" style="font-size:25px;color:green;">
  </p>
 
    <script>
        function myGeeks() {
           
            //  Return values of input field.
            var x = document.getElementById("users");
            var text = "";
            var i = 0;
            for (i = 0; i < x.length; i++) {
                text = text + x.elements[i].value + "<br>";
            }
            document.getElementById("sudo").innerHTML = text;
        }
    </script>
 
</body>
 
</html>

Output: Before clicking On Button:  

After Clicking On Button:  

Supported Browsers: The browser supported by DOM Form length Property are listed below:

  • Google Chrome 1 and above
  • Edge 12 and above
  • Firefox 1 and above
  • Opera 12.1 and above
  • Safari 3 and above

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