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: http://www.arcetri.astro.it/irlab/doc/library/javascript/clientreference/reset.htm
Дата изменения: Thu Oct 7 13:13:35 1999 Дата индексирования: Sat Dec 22 14:18:31 2007 Кодировка: |
INPUT
tag, with "reset"
as the value of the TYPE
attribute. For a given form, the JavaScript runtime engine creates an appropriate Reset
object and puts it in the elements
array of the corresponding Form
object. You access a Reset
object by indexing this array. You can index the array either by number or, if supplied, by using the value of the NAME
attribute.
Reset
object on a form looks as follows:
Reset
object is a form element and must be defined within a FORM
tag.
The reset button's onClick
event handler cannot prevent a form from being reset; once the button is clicked, the reset cannot be canceled.
Property |
Description
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Method |
Description
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watch
and unwatch
methods from Object
.
Text
object with the default value "CA" and a reset button with the text "Clear Form" displayed on its face. If the user types a state abbreviation in the Text
object and then clicks the Clear Form button, the original value of "CA" is restored.
<B>State: </B><INPUT TYPE="text" NAME="state" VALUE="CA" SIZE="2">Example 2. The following example displays two
<P><INPUT TYPE="reset" VALUE="Clear Form">
Text
objects, a Select
object, and three radio buttons; all of these objects have default values. The form also has a reset button with the text "Defaults" on its face. If the user changes the value of any of the objects and then clicks the Defaults button, the original values are restored.
<HTML>
<HEAD>
<TITLE>Reset object example</TITLE>
</HEAD>
<BODY>
<FORM NAME="form1">
<BR><B>City: </B><INPUT TYPE="text" NAME="city" VALUE="Santa Cruz" SIZE="20">
<B>State: </B><INPUT TYPE="text" NAME="state" VALUE="CA" SIZE="2">
<P><SELECT NAME="colorChoice">
<OPTION SELECTED> Blue
<OPTION> Yellow
<OPTION> Green
<OPTION> Red
</SELECT>
<P><INPUT TYPE="radio" NAME="musicChoice" VALUE="soul-and-r&b"
CHECKED> Soul and R&B
<BR><INPUT TYPE="radio" NAME="musicChoice" VALUE="jazz">
Jazz
<BR><INPUT TYPE="radio" NAME="musicChoice" VALUE="classical">
Classical
<P><INPUT TYPE="reset" VALUE="Defaults" NAME="reset1">
</FORM>
</BODY>
</HTML>
Button
, Form
, onReset
, Form.reset
, Submit
blur()
userReset:
userReset.blur()This example assumes that the button is defined as
<INPUT TYPE="reset" NAME="userReset">
Reset.focus
onClick
event handler.click()
focus()
Reset.blur
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.
Form
handleEvent(event)
event | The name of an event for which the specified object has an event handler. |
name
property initially reflects the value of the NAME
attribute. Changing the name
property overrides this setting.
Do not confuse the name
property with the label displayed on the reset button. The value
property specifies the label for this button. The name
property is not displayed on the screen; it is used to refer programmatically to the button.
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 Reset
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>")
}
}
Reset.value
Reset
objects, the value of the type
property is "reset"
. 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
attribute is not specified in HTML, the value
property is the string "Reset"
.
Do not confuse the value
property with the name
property. The name
property is not displayed on the screen; it is used to refer programmatically to the button.
value
property of a group of buttons and displays it in the msgWindow
window:
function valueGetter() {This example displays the following values:
var msgWindow=window.open("")
msgWindow.document.write("submitButton.value is " +
document.valueTest.submitButton.value + "<BR>")
msgWindow.document.write("resetButton.value is " +
document.valueTest.resetButton.value + "<BR>")
msgWindow.document.write("helpButton.value is " +
document.valueTest.helpButton.value + "<BR>")
msgWindow.document.close()
}
Query SubmitThe previous example assumes the buttons have been defined as follows:
Reset
Help
<INPUT TYPE="submit" NAME="submitButton">
<INPUT TYPE="reset" NAME="resetButton">
<INPUT TYPE="button" NAME="helpButton" VALUE="Help">
Reset.name
Last Updated: 05/28/99 12:00:19