Use the document.forms property in JavaScript to get the number of <form> tags in a document.
Example
You can try to run the following code to implement document.forms property in JavaScript.
<!DOCTYPE html> <html> <head> <title>JavaScript Example</title> </head> <body> <h1>Employee Information</h1> <form> Name: <input type="text" name="name" value="Amit"><br> Subject: <input type="text" name="sub" value="Java"> </form> <h1>Department Information</h1> <form> DepartmentID: <input type="text" name="dptid" value="D001"><br> Dept Name: <input type="text" name="dname" value="Marketing"> </form> <script> var num = document.forms.length; document.write("<br>How many forms? "+num); </script> </body> </html>