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HTML DOM form collection

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Sep 01, 2023 pm 02:49 PM

HTML DOM form collection is used to return all form elements present in the HTML document as a collection. The elements in the collection are sorted and displayed in the order in which they appear in the HTML document.

Properties

The following are the properties of the form collection-

Properties	Description
length	It is a read-only property that returns the number of elements in the collection.

Method

The following is the method of form collection-

Method	Description
[index]	Returns the element from the collection at the given index. Indexes start at 0 and return null if the index is out of bounds.
item(index)	The collection from the given index. The index starts at 0 and returns null if the index is out of range.
namedItem(id)	From the collection with the given id. If id does not exist, returns Null.

Syntax

The following is the syntax for HTML DOM form collection - p>

document.forms

Example

Let’s take a look at the HTML Example of DOM Form Collection -

Live Demo

<!DOCTYPE html>
<html>
<head>
<script>
   function formCollect() {
      for(var i=0;i<document.forms.length;i++){
         var no=document.forms[i].id+"<br>";
         document.getElementById("Sample").innerHTML +=no;
      }
   }
</script>
</head>
<body>
<h1 id="Forms-collection-example">Forms collection example</h1>
<form id="FORM1">
Fruit <input type="text" name="fname" value="Mango">
</form>
<form id="FORM2">
Age <input type="text" name="Age" value="22">
</form>
<form id="FORM3">
Password: <input type="password" name="pass" value="test">
</form>
<br>
<button onclick="formCollect()">GET IDS</button>
<p id="Sample">Following are the form ids <br></p>
</body>
</html>

Output

This will produce the following output-

HTML DOM表单集合

Single When clicking the "Get IDS" button-

HTML DOM表单集合

In the above example-

we first created three IDs as "FORM1" and "FORM2" form and "FORM3". The first two forms have an input element of text type and the third form has an input element of password type -

<form id="FORM1">
Fruit <input type="text" name="fname" value="Mango" >
</form>
<form id="FORM2">
Age <input type="text" name="Age" value="22" >
</form>
<form id="FORM3">
Password: <input type="password" name="pass" value="test">
</form>

GET IDS button executes formCollect() method when user clicks-

<button onclick="formCollect()">GET IDS</button>

The formCollect() method gets the document.forms length property value (3 in our case) and uses it in the test expression inside the for loop. Using the index number on the form collection, we get their id and append it to the paragraph with id "Sample" for display -

function formCollect() {
   for(var i=0;i<document.forms.length;i++){
      var no=document.forms[i].id+"<br>";
      document.getElementById("Sample").innerHTML +=no;
   }
}

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