The DOM forms collection is used to return the collection of all <form> elements in a HTML document. The form elements are sorted as they appear in the source code.Â
Syntax
document.formsProperties: It returns the number of form in the collection of elements.Â
Methods
- [index]: It is used to return the <form> element of the specified index. The index value starts at 0. NULL is returned if the index value is out of range.
- item(index): It is used to return the <form> element of specified index. The index value starts at 0. NULL is returned if the index value is out of range. This method performs similarly to the above method.
- namedItem(id): It is used to return the <form> element from the collection which matches the specified id. NULL is returned if the id does not exist.
Example 1: This example use length property to count number of form elements in the collection.Â
<!--Driver Code Starts-->
<!DOCTYPE html>
<html>
<head>
<title>
HTML | DOM forms Collection
</title>
</head>
<body>
<h1 style = "color:green">GeeksForGeeks</h1>
<h2>DOM document.forms Property</h2>
<!-- form 1 starts from here -->
<form id="personal-info">
<h3>Personal Information Area</h3>
Name: <input type="text">
</form>
<!-- form 1 ends here -->
<!-- form 2 starts from here -->
<form id="home-info">
<h3>Home Address Information Area</h3>
Address: <input type="text">
</form>
<!-- form 2 ends here -->
<!-- form 3 starts from here -->
<form id="delivery-info">
<h3>Delivery Type Area</h3>
Delivery Speed: <input type="text">
</form>
<!-- form 3 ends here -->
<p>
Click the button below to count
the number of forms:
</p>
<button onclick = "countForms()">
Count forms
</button>
<p>
The total number of forms in
this page is:
</p>
<div class = "count"></div>
<!--Driver Code Ends-->
<script>
function countForms() {
// Count number of forms
let collection = document.forms.length;
document.querySelector(".count").innerHTML
= collection;
}
</script>
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</body>
</html>
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Example 2:Â
<!--Driver Code Starts-->
<!DOCTYPE html>
<html>
<head>
<title>
HTML | DOM forms Collection
</title>
</head>
<body>
<h1 style="color:green">GeeksForGeeks</h1>
<h2>DOM document.forms Property</h2>
<!-- form 1 starts from here -->
<form id = "personal-info">
<h3>Personal Information Area</h3>
Name: <input type="text">
</form>
<!-- form 1 ends here -->
<!-- form 2 starts from here -->
<form id="home-info">
<h3>Home Address Information Area</h3>
Address: <input type="text">
</form>
<!-- form 2 ends here -->
<!-- form 3 starts from here -->
<form id="delivery-info">
<h3>Delivery Type Area</h3>
Delivery Speed: <input type="text">
</form>
<!-- form 3 ends here -->
<p>
Click the button below to find
all form IDs:
</p>
<button onclick="findFormIDs()">
Find form IDs
</button>
<p>The ID of all the forms is: </p>
<div class = "ids"></div>
<!--Driver Code Ends-->
<script>
function findFormIDs() {
let final = '';
let collection = document.forms;
// Run a loop upto the number of
// forms in the collection
for (let i = 0; i < collection.length; i++) {
// Add each form id to the final list
final += `<li> ${collection[i].id} </li>`;
}
// Replace the inner HTML of the
// ID div to show the list
document.querySelector(".ids").innerHTML = final;
}
</script>
<!--Driver Code Starts-->
</body>
</html>
<!--Driver Code Ends-->
Example 3:Â
<!--Driver Code Starts-->
<!DOCTYPE html>
<html>
<head>
<title>HTML | DOM forms Collection
</title>
</head>
<body>
<h1 style="color:green">GeeksForGeeks</h1>
<h2>DOM document.forms Property</h2>
<form id="personal-info">
<h3>Personal Information Area</h3>
Name: <input type="text">
</form>
<form id="home-info">
<h3>Home Address Information Area</h3>
Address: <input type="text">
</form>
<form id="delivery-info">
<h3>Delivery Type Area</h3>
Delivery Speed: <input type="text">
</form>
<p>
Click the button below to find by form
ID and get the name field:
</p>
<button onclick="returnForm()">
Find by form ID
</button>
<p>The text in the name field is: </p>
<div class="name"></div>
<script>
<!--Driver Code Ends-->
function returnForm() {
// find by id of 'personal-info'
let collection = document.forms.namedItem("personal-info");
// access the first element in the
//collection and find its value
// in this case it would be the name field
let name = collection[0].value;
document.querySelector(".name").innerHTML = name;
}
</script>
<!--Driver Code Starts-->
</body>
</html>
<!--Driver Code Ends-->
- document.forms returns every element in the document (in source order). Because it is live, the collection automatically updates if forms are added or removed from the DOM.
- You can retrieve a specific form using either its index (document.forms[0]), its id, or its name attribute (document.forms.login or document.forms["login"]).
