HTML and CSS Reference
In-Depth Information
window
document
forms[0] forms[1] forms[2]
Figure 11.11
The JavaScript
forms[]
array parallels the HTML form elements.
If you name the form with the
name
attribute of the HTML
<form>
tag, you can use
that name to reference the JavaScript
forms
object. Rather than saying
document.forms[0]
or
document.forms[1]
, you can reference the form by its name. For example, if the first
HTML form is named
myform1
, the corresponding JavaScript object,
document.forms[0]
,
can now be referenced as
document.myform1
. Even better, you can use the name of the
form as the index in an associative array,
document.forms[“myform1”]
where the name of
the form is the index value rather than a number.
The
elements
[]
Array.
HTML forms contain input devices like buttons and text-
boxes, also called fields. Similarly, the JavaScript
form
object consists of a property called
elements
. This is a JavaScript array that parallels all of the HTML fields within the form.
Each of the input types in the
elements[]
array is also an object in its own right. See
Figure 11.12.
window
document
forms[0]
forms[1]
elements[0] elements[1] elements[...]
elements[0] elements[1] elements[...]
Figure 11.12
How the
elements
[]
array parallels the HTML input devices.
