I have a JSP form with form property (In order to submit multiple files) as
enctype = "multipart/form-data";
encoding = "multipart/form-data";
When the form get submitted I'm reading the form data as
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload fileUpload = new ServletFileUpload(factory);
List<FileItem> fileItemList = fileUpload.parseRequest(request);
Now the issue I'm facing is that after the servlet process the request I'm coming back to the same page, after which if the user refreshes the page than based on the previous action performed the form is getting submitted again to the same servlet and I'm again getting the file which has been previously browsed and it's saving again.
Is there is any way we can clear the file information which has been browsed ?
Thanks
Your HTML code would have helped here. However, here is a solution that I think could help you resolve the issue.
You can reset the files associated with the file upload control by using
document.getElementById('yourFileInputControlId').files = '';
This should be done in java script immediately after your file upload request has been handled.(I am considering you are uploading your file using ajax)
If you are actually submitting the entire form rather than using Ajax, I do not see a reason why the file control would not reset. Please provide more details by editing the question if you still face the issue
Related
I want to save a page to a file in CODEIGNITER 3 - a whole page just before the page is sent to a browser. But I don't know how to do it and the most important is where to process the page in Codeigniter 3 code?
Oh, I was lucky to find it somehow in my code:
https://codeigniter.com/userguide3/general/hooks.html?highlight=display_override
display_override Overrides the _display() method, used to send the
finalized page to the web browser at the end of system execution. This
permits you to use your own display methodology. Note that you will
need to reference the CI superobject with $this->CI =& get_instance()
and then the finalized data will be available by calling
$this->CI->output->get_output().
I want to upload some XML files to Alfresco, so the create con tent form has an input file form element.
I need to check if the XML is well-formed, and I already have the backend validation functions triggered on ResourceBehavior.onContentUpdate. If the XML is malformed, I want to notify the user with a dialog window.
So far, I can prevent the user to submit malformed XML by throwing an exception when the XML is malformed, but I can't figure out how to have share to display an error message.
I have been looking at all the validation JS in share, but remember, file input forms need to be submitted first so that you can have a look at its content, thus the validation has to be server-sided.
Any pointers on where should I begin?
The problem you are going to have is that your backend behaviour is not aware of the specific client session that made the changes and what client session it is that needs to be notified.
If you want to display a useful message then you are going to have to write some additional Share customisation. Some options which you can explore are having an action or webscript that returns whether the XML is valid or not and customising the Share upload form to execute this action/webscript after the file has been uploaded and then return the relevant message to the user.
You'll find a pretty detailed post on modifying the upload form here:
http://www.ixxus.com/blog/2011/09/customising-upload-files-dialog-alfresco-share
If you're feeling lazy then I'd consider just aborting the file creation if the XML is invalid during an onCreate behaviour and then the user will see an 'Internal Error'.
Here is what I'm trying to accomplish (IE 9+, Chrome, FF, Safari) without the use of JQuery:
Make an http POST call to my API endpoint with some data
Server dynamically generates a PDF and returns the PDF as a binary attachment
Browser does default download behavior and downloads the PDF without refreshing the page
Basically I want to get the behavior similar to <a href="test.pdf"> but for a dynamically generated PDF after making a POST call instead of a GET call.
I've tried lots of different things, but they either didn't work cross browser (such as using $window.open() with a blob URL), were blocked by popup blockers (any $window call outside of the click scope), or didn't cause the PDF to be automatically downloaded (any $http POST solution).
I finally found one solution that seems to work which creates a form using javascript and submits it.
var form = document.createElement('form');
form.setAttribute('method', 'post');
form.setAttribute('action', myurl);
var params = {foo: 'bar'};
for(var key in params) {
if(params.hasOwnProperty(key)) {
var hiddenField = document.createElement('input');
hiddenField.setAttribute('type', 'hidden');
hiddenField.setAttribute('name', key);
hiddenField.setAttribute('value', params[key]);
form.appendChild(hiddenField);
}
}
document.body.appendChild(form);
form.submit();
This successfully accomplishes the 3 steps above, but now I've run into a new problem. There is no way to determine when the PDF file has been successfully downloaded. This is preventing me from removing the form and from displaying a friendly 'Please wait...' message to the user. There is also the additional problem that submitting the form cancels any outstanding ajax requests as well which isn't optimal.
I have full control over both the server and the client, so what's the best way to fix this? I don't want to have to save the PDF on the server so passing back a url and doing a second GET request from the client won't work in this case. Thanks!
You can make an server response behave as a download by applying some HTTP headers:
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="SOME_NAME.pdf"
Content-Transfer-Encoding: binary
If you're initiating the download through JS only (instead of having the user click a download link), then check out this question for some caveats.
Update: Syntax for POST
Better Update: Form solution with iframe target
You can detect that your server-side script has finished (and subsequently, that the download is ready to begin) by having the form target an iframe. I believe this should also fix the issue of cancelling outstanding Ajax calls, but I'm not certain. Here is the code to do it (just stick this into your code example after the for loop and before document.body.appendChild(form);):
var frame = document.createElement('iframe');
frame.setAttribute('id', 'pdfFrame');
frame.onload = function(){
document.body.removeChild(form);
document.body.removeChild(frame);
alert('Download ready!');
}
document.body.appendChild(frame);
form.setAttribute('target', 'pdfFrame');
You can replace my alert with your code to remove the 'Please wait...'.
I am using GWT2.4 version in my application.In this I application I have created Form using GWT control (like textbox,textaera).
I have also created preview of form.In that preview I have button of pdf generation.
Now I want to create behavior to deal with pdf link same as browsers(Mozilla/chrome).
For example in Mozilla on click of pdf link it asks for either save or open in a pop up window.
While debugging I found a jar name iText which can be used to create pdf, I want to implement browsers behavior in this also.
Please help me out.
Thanks in advance.
Read file contents into byte array.
Then do request for servlet or service, for eg. this way:
Window.Location.replace("rest/downloadPdf");
That Service should return Response with the right content type:
#Path("downloadPdf")
#GET
#Produces({"application/pdf"})
#Consumes(MediaType.TEXT_PLAIN)
public Response downloadPdf() throws Exception {
byte[] bytes = getYourPDFContents();
return Response
.ok(bytes, MediaType.APPLICATION_OCTET_STREAM)
.header("Content-Disposition", "attachment; filename=\"yourFile.pdf\"")
.build();
}
Browser will then show save as dialog.
That's example of Service, you must include Jersey library into your project to be able to use method like I've wrote above .
I need to make a simple page in JSP. I've never worked in JSP before ever.
I have a form that has two fields: one is a file upload field and the other is a textbox. The user enters one email address in the field and uploads a file and upon submission. I should be able to email the attachment to the email address entered.
I need a quick code snippet that does this.
try to see this code, might need some debugging though :)
or this one from here (through the JavaMail API):
SmtpSender smtp=SmtpSender.getInstance();
MailToBeSent send=new MailToBeSent();
send.setSubject("Hello");
send.setFromAddress("some#bar.com","Someone");
send.addToAddress("another#foo.com","Anotherone");
send.setBody("Hello, test with the file attachment!");
byte[] bin=.....
send.attacheFile(bin,"photo.jpg","image/jpeg");
smtp.sendMail(send);