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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: Поисковые слова: annular solar eclipse |
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.
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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() {
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()
}
This example displays the following values:
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