Is there a way to convert some html to PDF in GWT Client side
I have seen some libraries like iText , but they all seem to work on server side .
can i get the PDF without involving any server side work
is there any possibility
Thanks
I think you can use this JS Library to generate pdf on the client:
https://parall.ax/products/jspdf
or look in this SO question: Generating PDF files with Javascript
Related
I have here this website:https://www.connect2nse.com/iislNet/UserFolder.jsp
Firstly i tried using WWW::Mechanize, but it doesn't seem to work. WWW::Mechanize doesn't work with JSP written website. So I researched about how to download a file in a website written in JSP, but can't find a good one. Can anybody help me with this one? Thanks in advance.
As far as the client is concerned, JavaServer Pages is identical to PHP, Perl, or even static HTML files. The result is a page of HTML that can be rendered and displayed, and the source of the data isn't the reason for WWW::Mechanize failing to do what you want
Doesn't work is useless as a problem description, and the issue could be pretty much anything. However, if the HTML is associated with some JavaScript (which is executed on the client system after the page has been retrieved and not on the server) then it may be more or less handicapped because WWW::Mechanize doesn't support JavaScript. For that you will need to use WWW::Mechanize::Firefox or similar, which works by using a real instance of Firefox to render the HTML and execute any JavaScript
I need to export a google visualization chart to pdf in my Java EE application. Looks like all client side pdf tools (eg. JSPDF) are using HTML5 features and will not work in IE9 or below.
<img id="gChartImg"></div>
$("#gChartImg").attr("src",chart.getImageURI());
We're already using pdfbox to export the html to PDF. Is there any way to get this image in server side using $().ajaxform or webservices.
Any help is appreciated.
i'm beginner with GXT and i'm wondering if there is a way to parse a file and extract some informations without uploading it.
i created a formpanel that contains an uploadFile form but i don't know waht's next, how to get the complete path of the file so i can read/write with java io or how to retrieve the file or is there an alternatif solution, thank you.
Best Regards.
You can do it in some modern browsers using bleeding edge HTML5 apis for which you would need to use GWT JSNI code. There are no api's from GWT team as is.
HTML5 FileReader
FileReader includes four options for reading a file, asynchronously:
FileReader.readAsBinaryString(Blob|File) - The result property will contain the file/blob's data as a binary string.
FileReader.readAsText(Blob|File, opt_encoding) - The result property will contain the file/blob's data as a text string.
FileReader.readAsDataURL(Blob|File) - The result property will contain the file/blob's data encoded as a data URL.
FileReader.readAsArrayBuffer(Blob|File) - The result property will contain the file/blob's data as an ArrayBuffer object.
Example of GWT wrapper over these -
https://github.com/bradrydzewski/gwt-filesystem
You can read about it more from here - How to retrieve file from GWT FileUpload component?
IMHO you cannot read it .
Due to security reasons javascript(gwt) doesn't have access to the system drives files.
http://en.wikipedia.org/wiki/JavaScript#Security
see Opening a file in local file system in javascript
In order to get the file you need to make a server call.
Instead you can do your validation server side and throw proper messages to user.
P.S : i am not considering modern browser concept.What happens if someone opened in other than so called modern browsers?? Will the programm runs same?? Its always better to do server side validation..
Anybody know how GWT file upload works? I know about FileUpload widget and how to use it. I want to know what is its inner mechanism. We can't get contents of file from FileUpload widget in client and how it is going to server? I googled it but i didn't get solution.
Thanks in advance.
GWT's file upload makes use HTML's input element. The html input element is native html dom element which allows to select files from your system.
After selection you need to submit it to your server. This is done by the GWT's FormPanel.
In particular, FileUpload is only useful when used within a FormPanel, because the browser will only upload files using form submission.
Note:
1) You can read about how to code with formpanel and fileupload as answered here # Basic File upload in GWT
2) If you are concerned with processing the file on client side and not pushing the file to server then you have limited options as mentioned here # How to retrieve file from GWT FileUpload component?
formPanel.setAction(GWT.getModuleBaseURL()+"uploadHandler");
formPanel.setMethod(Method.POST);
when we use formPanel.submit(),we can invoke the servlet and get the file upload details.
If there's a way for the client side GWT code to pre-process a file on the client computer?
For example, to calculate a checksum of it before submitting the file to the server.
No it is not possible. The manipulation of the file is done by the browser, not the HTML code.
Think about it, GWT is 100% javascript. And javascript has no access whatsoever of the file in your computer. That would be an pretty big security risk! GWT "wraps" the file input box so it can be displayed inside the GWT panel. But once you press the "upload" button, the upload is done by the browser.
You could do file manipulation with another technology however. Java applets for example. But that is outside of GWT area...
Using GWT, there is no way to read files on the client side yet. However, in HTML5, you can read files without uploading to a server using the "File API".
Links are provided below.
File API tutorial on html5rocks.com
Example of how to use File API in GWT via JSNI
I'm pretty sure that because GWT code compiles to pure JavaScript, there isn't a way without requiring some third-party browser plugin.
Do you mean from an <input type="file"...> file upload field in a form?
The short answer is no-- file uploads are handled by the browser, and are sent directly to the server (as an ENCODING_MULTIPART POST). And security restrictions on JavaScript mean there's no way to workaround that restriction.