For a while, we were using a solution that allowed us to download generated
PDF's but it only seemed to work in IE and some people had trouble using it
from "outside connections."
What I wanted was a way to access dynamic/generated content that:
- Doesn't cause Wicket to be come non-responsive after the request
- Works in at least IE and FF
- Allows a file name to be provided
- Allows a mime type to be provided
After taking another stab at it, I was able to get that working. Here is
what I ended up with:
public class ByteDataRequestTarget extends ByteArrayResource implements
IRequestTarget {
private String fileName;
public ByteDataRequestTarget(String mimeType, byte[] data, String
fileName)
{
super(mimeType, data, fileName);
this.fileName = fileName;
}
public void detach(RequestCycle requestCycle) { }
public void respond(RequestCycle requestCycle) {
requestCycle.setRequestTarget(new
ResourceStreamRequestTarget(this.getResourceStream() ) {
public String getFileName() {
return fileName;
}
} );
}
}
And then I subclassed for different common file types like PDF and CSV.
Those subclasses basically just provide the MIME type for the user and
automatically add the file extension.
public class PdfRequestTarget extends ByteDataRequestTarget {
public PdfRequestTarget(byte[] data, String fileName) {
super(Constants.PDF_MIME_TYPE, data, fileName+".pdf");
}
}
To use the class, you do something like this:
new Button(buttonId, new Model("My Button") ) {
public void onSubmit() {
getRequestCycle().setRequestTarget(new
PdfRequestTarget(getSomePdfData(),
"FileName") );
}
};
I hope that helps.
wch2001 wrote:
>
> UPBrandon,
> Did u find any solution for it?
>
> anyone can help?
>
> thanks
>
>
> UPBrandon wrote:
>>
>> It's not that I necessary want to see the page refreshed with updated
>> form values. In fact, I would prefer that the user not leave the page at
>> all. All the form contains is a checkgroup of "things" to include in the
>> PDF. All I want to do when the button is pressed is view/download the
>> PDF but the form with the checkgroup needs to be submitted first so I can
>> see what was checked when I generate the PDF.
>>
>> I suppose taking the ResourceReference's and using it in the onload would
>> work but it seems like such a hack, not to mention that it might cause
>> problems if the user uses the back button. While working on my
>> DynamicWebResource, I was able to download a PDF and continue using my
>> application using a link (assigned to either a link or button in HTML.)
>> The only problem is that it doesn't do a submit. Accessing the
>> DynamicWebResource from a button works but makes my app non-responsive.
>> What I would like to do is either make the ResourceLink somehow submit my
>> form or, even better, make a button component that handles the request in
>> a way that doens't break Wicket. Ideas/suggestions?
>>
>> -Brandon
>>
>>
>> igor.vaynberg wrote:
>>>
>>> so you want to see the page with updated form values _and_ stream the
>>> pdf?
>>>
>>> why dont you take that url you generated for your resourceref and
>>> append it to a window.onload javascript that does window.location=url;
>>>
>>> -gior
>>>
>>>>
>>>> As I mentioned in my previous response, I couldn't use
>>>> getRequestCycle().setRequestTarget() directly because of the way the
>>>> API
>>>> works (you can use a ResourceReference but not a Resource.) Instead,
>>>> I
>>>> ended up with something like this:
>>>>
>>>> new AjaxButton(buttonId, form) {
>>>> protected void onSubmit(AjaxRequestTarget target, Form form) {
>>>> ResourceReference pdfReference = new
>>>> ResourceReference("") {
>>>> protected Resource newResource() {
>>>> return new BillPdfWebResource(...);
>>>> }
>>>> };
>>>> String url =
>>>> getRequestCycle().get().urlFor(pdfReference).toString();
>>>> getRequestCycle().setRequestTarget(new
>>>> RedirectRequestTarget(url) );
>>>> }
>>>> }
>>>>
>>>> It works... but only once. When I click on the button, everything
>>>> works, my
>>>> PDF gets generated and downloaded but then my app becomes
>>>> unresponsive. I
>>>> can't interact with the site at all until I "start over." Is there a
>>>> better
>>>> way to go about this that wouldn't cause that side effect? Whatever
>>>> approach I take, I need to be able to submit a form when the PDF is
>>>> generated. My example doesn't show it but my BillPdfWebResource class
>>>> generates a PDF based on the user's selection and my Form's Model
>>>> needs to
>>>> be updated. Any suggestions?
>>>>
>>>> -Brandon
>>>>
>>>> igor.vaynberg wrote:
>>>> >
>>>> > onsubmit() {
>>>> > getrequestcycle().setrequesttarget(new
>>>> > redirectrequesttarget(urlfor(resourceref)));
>>>> > }
>>>> >
>>>> > -igor
>>>> >
>>>> > On Feb 13, 2008 8:18 AM, UPBrandon <[email protected]> wrote:
>>>> >>
>>>> >> In a project I am working on, I wrote a DynamicWebResource that
>>>> generates
>>>> >> a
>>>> >> PDF file and, by setting the Content-Disposition in the header, got
>>>> it so
>>>> >> that the user is prompted to download the PDF when they click on a
>>>> >> ResourceLink to my PDF-generating resource.
>>>> >>
>>>> >> That all works fine but now I need to open the PDF from a button.
>>>> I want
>>>> >> to
>>>> >> allow the user to select a value in a form and press a button to
>>>> view
>>>> >> somewhat of a report for the item they selected. However, there
>>>> doesn't
>>>> >> appear to be any type of button that would lead a user to my
>>>> >> DynamicWebResource. Is there any way to have a button do a submit
>>>> >> (update
>>>> >> the model) and then lead the user to a resource?
>>>> >>
>>>> >> -Brandon
>>>
>>
>
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