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: http://www.arcetri.astro.it/irlab/doc/library/javascript/clientreference/fileup.htm
Дата изменения: Thu Oct 7 13:13:37 1999 Дата индексирования: Sat Dec 22 14:24:00 2007 Кодировка: Поисковые слова: чоеыойе рмбоефщ |
INPUT
tag, with "file"
as the value of the TYPE
attribute. For a given form, the JavaScript runtime engine creates appropriate FileUpload
objects and puts these objects in the elements
array of the corresponding Form
object. You access a FileUpload
object by indexing this array. You can index the array either by number or, if supplied, by using the value of the NAME
attribute.
FileUpload
object on a form looks as follows:A
FileUpload
object is a form element and must be defined within a FORM
tag.
Property |
Description
|
|
|
| |
---|
Method |
Description
|
|
|
| |
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watch
and unwatch
methods from Object
.
FileUpload
object on a form and provides two buttons that let the user display current values of the name
and value
properties.
<FORM NAME="form1">
File to send: <INPUT TYPE="file" NAME="myUploadObject">
<P>Get properties<BR>
<INPUT TYPE="button" VALUE="name"
onClick="alert('name: ' + document.form1.myUploadObject.name)">
<INPUT TYPE="button" VALUE="value"
onClick="alert('value: ' + document.form1.myUploadObject.value)"><BR>
</FORM>
Text
blur()
FileUpload.focus
, FileUpload.select
FileUpload
field and give it focus.focus()
FileUpload.blur
, FileUpload.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. 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 FileUpload
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 a file upload field. You can use the select
method with the focus
method to highlight a field and position the cursor for a user response. This makes it easy for the user to replace all the text in the field.
FileUpload.blur
, FileUpload.focus
FileUpload
objects, the value of the type
property is "file"
. 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 of the object.value
property to obtain the file name that the user typed into a FileUpload
object.
Last Updated: 05/28/99 11:59:26