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: http://www.arcetri.astro.it/irlab/doc/library/javascript/clientreference/password.htm
Дата изменения: Thu Oct 7 13:13:35 1999 Дата индексирования: Sat Dec 22 14:35:36 2007 Кодировка: Поисковые слова: п п п п п п п п п п п п п |
JavaScript 1.1: added |
INPUT
tag, with "password"
as the value of the TYPE
attribute. For a given form, the JavaScript runtime engine creates appropriate Password
objects and puts these objects in the elements
array of the corresponding Form
object. You access a Password
object by indexing this array. You can index the array either by number or, if supplied, by using the value of the NAME
attribute.
Password
object on a form looks as follows:
Password
object is a form element and must be defined within a FORM
tag.
value
property is returned in plain text and has no security associated with it. Take care when using this property, and avoid storing its value in a cookie.
JavaScript 1.1.
If a user interactively modifies the value in a password field, you cannot evaluate it accurately unless data tainting is enabled. For information on data tainting, see the Client-Side JavaScript Guide.
Property |
Description
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Method |
Description
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watch
and unwatch
methods from Object
.
Password
object with no default value:
<B>Password:</B>
<INPUT TYPE="password" NAME="password" VALUE="" SIZE=25>
Form
, Text
blur()
userPass:
userPass.blur()This example assumes that the password is defined as
<INPUT TYPE="password" NAME="userPass">
Password.focus
, Password.select
Password
object.defaultValue
is null (for security reasons), regardless of the value of the VALUE
attribute.
Setting defaultValue
programmatically overrides the initial setting. If you programmatically set defaultValue
for the Password
object and then evaluate it, JavaScript returns the current value.
You can set the defaultValue
property at any time. The display of the related object does not update when you set the defaultValue
property, only when you set the value
property.
Password.value
focus()
focus
method to navigate to the password field and give it focus. You can then either programmatically enter a value in the field or let the user enter a value.
checkPassword
function confirms that a user has entered a valid password. If the password is not valid, the focus
method returns focus to the Password
object and the select
method highlights it so the user can reenter the password.
function checkPassword(userPass) {This example assumes that the
if (badPassword) {
alert("Please enter your password again.")
userPass.focus()
userPass.select()
}
}
Password
object is defined as
<INPUT TYPE="password" NAME="userPass">
Password.blur
, Password.select
form
property that is a reference to the element's parent form. This property is especially useful in event handlers, where you might need to refer to another element on the current form.
handleEvent(event)
event | The name of an event for which the object has an event handler. |
name
property initially reflects the value of the NAME
attribute. Changing the name
property overrides this setting. The name
property is not displayed on-screen; it is used to refer to the objects programmatically.
If multiple objects on the same form have the same NAME
attribute, an array of the given name is created automatically. Each element in the array represents an individual Form
object. Elements are indexed in source order starting at 0. For example, if two Text
elements and a Password
element on the same form have their NAME
attribute set to "myField"
, an array with the elements myField[0]
, myField[1]
, and myField[2]
is created. You need to be aware of this situation in your code and know whether myField
refers to a single element or to an array of elements.
valueGetter
function uses a for
loop to iterate over the array of elements on the valueTest
form. The msgWindow
window displays the names of all the elements on the form:
newWindow=window.open("http://home.netscape.com")
function valueGetter() {
var msgWindow=window.open("")
for (var i = 0; i < newWindow.document.valueTest.elements.length; i++) {
msgWindow.document.write(newWindow.document.valueTest.elements[i].name + "<BR>")
}
}
select()
select
method to highlight the input area of the password field. You can use the select
method with the focus
method to highlight a field and position the cursor for a user response.
checkPassword
function confirms that a user has entered a valid password. If the password is not valid, the select
method highlights the password field and the focus
method returns focus to it so the user can reenter the password.
function checkPassword(userPass) {This example assumes that the password is defined as
if (badPassword) {
alert("Please enter your password again.")
userPass.focus()
userPass.select()
}
}
<INPUT TYPE="password" NAME="userPass">
Password.blur
, Password.focus
Password
objects, the value of the type
property is "password"
. This property specifies the form element's type. type
property for every element on a form.
for (var i = 0; i < document.form1.elements.length; i++) {
document.writeln("<BR>type is " + document.form1.elements[i].type)
}
VALUE
attribute.value
property and then evaluate it, JavaScript returns the current value. If a user interactively modifies the value in the password field, you cannot evaluate it accurately unless data tainting is enabled. For information on data tainting, see the Client-Side JavaScript Guide.
Password
object field. The value of this property changes when a user or a program modifies the field, but the value is always displayed as asterisks.
Password.defaultValue
Last Updated: 05/28/99 12:00:09