I am sending request on server, and server returns StreamingOutput (wriring bytes of pdf file)
In onResponseRecieved i need to handle this file and start download. How to start to download this file?
I supose you dont need to process that data in javascript, do you?
If you just want to download the file or display it in the browser, create a button in your page so as when the user clicks it will show in a new window or the user will asked to save the file:
final String url = "http://gwtquery.googlecode.com/git/README.txt";
String name = "README.txt";
Anchor link1 = new Anchor(name);
RootPanel.get().add(link1);
link1.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
Window.open(url, "_blank", "");
}
});
Related
Within a pdf it is possible to change page numbering, so the first page would be page 5, etc.
(This has nothing to do with headers and footers, i'm speaking strictly about the page numbers as they appear in the pdf toolbar)
Is it possible to control those numbers with EvoPDF?
Yes, apparently with EVOPDF v5 you can set the number to be displayed on the page using the PageNumberingStartIndex property of the PdfHeaderOptions object (same for Footers). I don't know of any examples using this.
It is not possible to change the page numbering displayed by Adobe Reader using an option in the generated PDF document. What you can do is to make the PDF viewer go to a certain page in PDF document when the document is opened. You can check the Go To a Location in a PDF Page When the Document is Opened Demo . The C# code to implement this feature is:
protected void convertToPdfButton_Click(object sender, EventArgs e)
{
// Create a HTML to PDF converter object with default settings
HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();
// Set license key received after purchase to use the converter in licensed mode
// Leave it not set to use the converter in demo mode
htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";
Document pdfDocument = null;
try
{
// Convert a HTML page to a PDF document object
pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(urlTextBox.Text);
int goToPageNumber = int.Parse(pageNumberTextBox.Text);
if (goToPageNumber > pdfDocument.Pages.Count)
{
return;
}
// Get destination PDF page
PdfPage goToPage = pdfDocument.Pages[goToPageNumber - 1];
// Get the destination point in PDF page
float goToX = float.Parse(xLocationTextBox.Text);
float goToY = float.Parse(yLocationTextBox.Text);
PointF goToLocation = new PointF(goToX, goToY);
// Get the destination view mode
DestinationViewMode viewMode = SelectedViewMode();
// Create the destination in PDF document
ExplicitDestination goToDestination = new ExplicitDestination(goToPage, goToLocation, viewMode);
// Set the zoom level when the destination is displayed
if (viewMode == DestinationViewMode.XYZ)
goToDestination.ZoomPercentage = int.Parse(zoomLevelTextBox.Text);
// Set the document Go To open action
pdfDocument.OpenAction.Action = new PdfActionGoTo(goToDestination);
// Save the PDF document in a memory buffer
byte[] outPdfBuffer = pdfDocument.Save();
// Send the PDF as response to browser
// Set response content type
Response.AddHeader("Content-Type", "application/pdf");
// Instruct the browser to open the PDF file as an attachment or inline
Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Go_To_Page_Open_Action.pdf; size={0}", outPdfBuffer.Length.ToString()));
// Write the PDF document buffer to HTTP response
Response.BinaryWrite(outPdfBuffer);
// End the HTTP response and stop the current page processing
Response.End();
}
finally
{
// Close the PDF document
if (pdfDocument != null)
pdfDocument.Close();
}
}
I have a servlet that delivers png and svg images. With png i have no problem:
Image image = new Image(GWT.getHostPageBaseURL() + token);
But how to get svg to work? I already added "lib-gwt-svg" to my dependencies. There is a SVGImage class:
SVGImage svg = new SVGImage(OMSVGParser.parse(???));
The parse takes a string. Is there a way to load a raw String from an URL?
Or how to get it to work (with or without "lib-gwt-svg")?
Update:
thx to Andrei Volgin: he pointed out that it should work with "Image" and it does (i just had to correct the mime type to "image/svg+xml"). But the scripts within svg-image don't work this way (it looks like the images is rendered as a normal bitmap image).
I need the image rendered as svg (with scripts).
If you use a URL to load an image, you don't need any libraries at all. And you don't need a servlet to deliver them. Just add images to your /war/images folder. Then, in your GWT code:
Image image = new Image();
image.setUrl("images/myImage.svg");
myPanel.add(image);
You may want to add some logic for browsers that do not support svg files.
I found a solution that works without any external library (like Andrei's Solution) but keeps also the embedded scripts working. I used the info from here - i used a HTMLPanel and loaded the image via "RequestBuilder":
String url = GWT.getHostPageBaseURL() + link.getToken();
RequestBuilder rB = new RequestBuilder(RequestBuilder.GET, url);
rB.setCallback(new RequestCallback() {
#Override
public void onResponseReceived(Request request, Response response) {
//create Widget
chartImage = new HTMLPanel(response.getText());
//add to layout
layout.add(chartImage);
}
#Override
public void onError(Request request, Throwable exception) {
// TODO Auto-generated method stub
}
});
In my GWT app I have written a servlet to download/stream a PDF file.
Following is the code.
protected void updateResponse(HttpServletResponse response, InputStream dataStream, long contentLength, KnownContentTypes contentType, String filename, int cacheSeconds) {
response.setHeader("Content-Type", contentType.getTypeString());
response.setHeader("Content-Length", String.valueOf(contentLength));
response.setHeader("Content-disposition", "inline;filename=" + filename);
response.setHeader("Cache-Control", "max-age=" + cacheSeconds);
byte[] buffer = new byte[BUFFER_SIZE];
try {
ServletOutputStream out = response.getOutputStream();
while ((dataStream.read(buffer)) != -1) {
out.write(buffer);
}
} catch (IOException e) {
sendError(response);
}
}
The pdf is successfully rendered on the browser.
The problem is some pdf's are really large in size and since this is called on window.open all I see is a blank browser.
I want to display a dynamic message like '1MB of 5MB downloaded' and display/render the entire PDF file once all bytes are streamed.
Please let me know how to do this.
I am new to GWT and any help will be appreciated.
Thanks.
This can not be done with synch request which we usually make by calling servlet with Window.open You have to make ajax request to calculate progress and display the response.
Take a look to this library: http://code.google.com/p/gwtupload/. It is really easy to to use and works fine in most of the browsers. It uses ajax requests to calculate progress.
I want to add the bookmark function to my app, when I clicked on the webview which display the HTML files (The file's main part is string), I want to capture the first line of the content which display on the screen. Anyone knows the answer?
Thanks very much in advance.
-Shawn
you can identify the some content of the page as It contains img tag or not
Use this API of webView click here
WebView.HitTestResult hr = ((WebView)v).getHitTestResult();
int i=hr.getType() ;
and use the int values of this class for the content
Hope it help
If there is a link into the WebView and you want to do a specific action when the user click on this link you must catch the link click using the following code:
Somewhere in your activity code (commonly in the onCreate method):
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState, R.layout.news_details);
...
mWebView.setWebViewClient(new MyWebViewClient());
...
}
And the WebViewClient class:
class MyWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (DEBUG) {
Log.d(TAG, "shouldOverrideUrlLoading url= " + url);
}
if ( the url is like you want) {
// TODO: add the code to do what you need to do with the url
// the webview should not do anything with this link.
return true;
} else {
// let the webview normally handle the link
return false;
}
}
}
If what you want to do is get the actual displayed content of the WebView, there is no API to do that.
Have a look on those post:
Is it possible to get the HTML code from WebView
Retrieve webview content
Both redirect on this website:
http://lexandera.com/2009/01/extracting-html-from-a-webview/
I want to upload file in my application and want to set path where the files should be saved after uploading in my local system.I am using the following code but on the submit button getting no response while clicking.Please tell me the code which works fine for the file upload in gwt.
[code]
public class FormPanelExample implements EntryPoint {
public void onModuleLoad() {
// Create a FormPanel and point it at a service.
final FormPanel form = new FormPanel();
form.setAction("/myFormHandler");
// Because we're going to add a FileUpload widget, we'll need to set the
// form to use the POST method, and multipart MIME encoding.
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setMethod(FormPanel.METHOD_POST);
// Create a panel to hold all of the form widgets.
VerticalPanel panel = new VerticalPanel();
form.setWidget(panel);
// Create a TextBox, giving it a name so that it will be submitted.
final TextBox tb = new TextBox();
tb.setName("textBoxFormElement");
panel.add(tb);
// Create a ListBox, giving it a name and some values to be associated with
// its options.
ListBox lb = new ListBox();
lb.setName("listBoxFormElement");
lb.addItem("foo", "fooValue");
lb.addItem("bar", "barValue");
lb.addItem("baz", "bazValue");
panel.add(lb);
// Create a FileUpload widget.
FileUpload upload = new FileUpload();
upload.setName("uploadFormElement");
panel.add(upload);
// Add a 'submit' button.
panel.add(new Button("Submit", new ClickListener() {
public void onClick(Widget sender) {
form.submit();
}
}));
// Add an event handler to the form.
form.addFormHandler(new FormHandler() {
public void onSubmit(FormSubmitEvent event) {
// This event is fired just before the form is submitted. We can take
// this opportunity to perform validation.
if (tb.getText().length() == 0) {
Window.alert("The text box must not be empty");
event.setCancelled(true);
}
}
public void onSubmitComplete(FormSubmitCompleteEvent event) {
// When the form submission is successfully completed, this event is
// fired. Assuming the service returned a response of type text/html,
// we can get the result text here (see the FormPanel documentation for
// further explanation).
Window.alert(event.getResults());
}
});
RootPanel.get().add(form);
}
}
Thanks
Amandeep
Now, I remember.. There's a bug in the FormPanel code that causes form.submit() not to work, when the type of the form is changed from the default (don't know if it's fixed yet in any release of GWT). If you create a "native" submit button like this:
HTML nativeSubmitButton new HTML("<input class='gwt-Button' type='submit' value='" + buttonText + "' />")
It will submit the form.
The disadvantage is that you cannot use any Button methods on this object, since it's a simple HTML wrapper. So disabling the button on submit (to avoid accidental double submit, and to give feedback that the form is actually submitting) won't work .
I've created a utility class for this purpose myself called DisableableSubmitButton that is essentially a FlowPanel with one HTML button like the above, and one gwt Button that is disabled, and some logic to toggle each of them visible. Since it cannot modify the actual enabled status of the HTML button all submit handlers must ask this class if it's "enabled" or not and cancel the event if it is. If you're interested in this implementation, i could share it with you (I don't want to flood stackoverflow with code unless you are interested).