on 01-31-2005 4:42 AM
Hi all ,
Can someone help me can i use UI download elements . it would be good if someone can post the code for the same . I couldnt understand mcuh through the documentation for the same .
Thanks & Regards,
Udai
Can you elobarate your query..
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Web Dynpro FileDownload API IWDFileDownload
Definition
You can use the FileDownload UI element to load files from the server to the client. The data property determines the data source in the view context. The target property determines the ID of the target window in the browser. For more information about this UI element, see the Binding section below.
Description of the UI Element Properties
· data
Determines the data source of the files to be downloaded in the context.
· target
Determines the ID of the target window in the browser, if the link is activated. Either the users can specify the ID themselves or it has the value _blank, which opens an external, unnamed window.
· type
Describes the graphical representation of the FileDownload UI element. The type property can be filled with the following values and is represented by the enumeration type WDLinkType.
function
The UI element appears in the standard design and underlined.
navigation
The UI element appears underlined and in the color used for links that the user has already visited.
reporting
The UI element appears in the standard design and not underlined.
result
The UI element appears not underlined.
Overview of Inherited and Additional Properties
Name
Interface
Type
Initial Value
bindable
Value Required
data
IWDFileDownload
Object
bindable_mandatory
No
enabled
IWDUIElement
boolean
true
bindable
No
imageAlt
IWDAbstractCaption
String (TranslatableText)
bindable
No
imageFirst
IWDAbstractCaption
boolean
true
bindable
No
imageHeight
IWDLink
String
bindable
No
imageSource
IWDAbstractCaption
String
bindable
No
imageWidth
IWDLink
String
bindable
No
size
IWDLink
WDLinkSize
standard
bindable
No
target
IWDFileDownload
String
_BLANK
bindable
No
text
IWDLink
String (TranslatableText)
bindable
No
tooltip
IWDUIElement
String (TranslatableText)
bindable
No
type
IWDFileDownload
WDLinkType
navigation
bindable
No
visible
IWDUIElement
WDVisibility
visible
bindable
No
wrapping
IWDLink
boolean
false
bindable
No
Data Binding
At design time, you add the FileDownload UI element to an appropriate view. You then define a value attribute of type binary in the context of this view, also at design time; for the source text below the value attribute is called FileDownload.
The data property must be bound to this value attribute of data type binary, so that the file can be downloaded as a byte array. At runtime, the binary data type can be enhanced with data to allow the passing of related information when downloading a file. Using the IWDModifiableBinaryType data type, which represents an extension of the binary data type you can access the MIME type of the file, that is, either read or set the MIME type. To do this, you must implement the following source text in the wdDoInit method of the controller implementation, with which, on the one hand, the binary data type is enhanced at runtime and on the other hand, the file extension is passed on during download:
public void wdDoInit()
{
//@@begin wdDoInit()
// The FileDownload UI element requires:
IWDAttributeInfo attInfo = wdContext.nodeRoot().getNodeInfo().getAttribute("FileDownLoad");
binaryType = (IWDModifiableBinaryType) attInfo.getModifiableSimpleType();
// in addition the FileDownload UI element needs for defined resource types
binaryType.setFileName("Snow Trees.jpg");
binaryType.setMimeType(WDWebResourceType.JPG_IMAGE);
//The FileDownload UI element needs for undefined resource types
binaryType.setFileName("Snow Trees.xcc");
binaryType.setMimeType(new WDWebResourceType("xcc", "", true));
//@@end
}
Note that during the download, the MIME type of the file must be set in the controller implementation. Furthermore, you must pass on additional parameters to the setMimeType method, if the data type is not available in the Java Dictionary.
Methods in the Web Dynpro IWDFileDownload API
Method Name
Parameter
Return Value
Short Description
bindData
(String path)
Binds the value of the data property to the content element specified by the path.
bindingOfData
String
Returns the path of the content element to which the data property is bound. Returns NULL if no binding exists.
bindingOfTarget
String
Returns the path of the context element to which the target property is bound. Returns NULL if no binding exists.
bindingOfType
String
Returns the path of the context element to which the type property is bound. Returns NULL if no binding exists.
bindTarget
(String path)
Binds the target property to the context node specified by a path.
bindType
(String path)
Binds the type property to the context node specified by a path.
getData
Object
Returns the value of the data property.
getTarget
String
Returns the value of the target property.
getType
WDLinkType
Returns the value of the type property.
setData
(Object data)
Sets the value of the data property.
setTarget
(String target)
Sets the value of the target property.
setType
(WDLinkType type)
Sets the value of the type property.
Additional methods described in the following APIs are available using inheritance:
Hope this helps...
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