OK, here is the problem I have. I have a servlet that dynamically creates an image (not based on parameters) which I do NOT want to save on the HDD.
I also have a HTML template (JSP) where I want to show that picture.
I create my image as following:
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PieDataset dataset = createDataset();
JFreeChart chart = createChart(dataset, "OS Usage");
resp.setContentType("image/png");
ChartUtilities.writeChartAsPNG(resp.getOutputStream(), chart, 500, 400);
req.getRequestDispatcher("report.jsp").forward(req, resp);
}
My JSP looks like this:
<body>
<h1>OS usage</h1>
<p>Here are the results of OS usage in survey that we completed.<br>
<p><img alt="OS usage" src="/reportImage">
</body>
When that code is executed, I get what I expected, from the way I wrote my code, a image only, without any html.
My question is how to do it so the HTML renders as well.
Thx.
You should have two servlets:
One to generate the HTML page (by forwarding to a JSP). This generated page contains <img src="/reportImage" .../>. When the browser sees this tag, it sends a second request, to the URL /reportImage.
One to generate the image, mapped to the /reportImage URL. This servlet should only send the bytes of the image to the response output stream. It must not forward to a JSP.
declare count=0 in your servlet.. if u get image then increment the count value.. now tha value is 1.. in your jsp code put one condition if count==1 show that img else hide the tag
Related
I have to create code snippets in UI (like in StackOverflow/bootstrap etc.) where the data is coming from the database.
Suppose my code is:
class test {
public static void main(String args[]) {
System.out.println("Hello");
}
}
I am sending this piece of code exactly like this (with proper tabs and enter) but when I render this in view it becomes a single line. I saw that the data gets stores as a single line in the database.
Is there any way to do this in Angular? I have tried using pre but it can't understand where to break line.
Note: This is about JavaFX WebView, not Android WebView (i. e. I have seen "Android Webview Anchor Link (Jump link) not working").
I display a generated HTML page inside a javafx.scene.web.WebView that contains anchors and links to those anchors like this:
<p>Jump to Introduction</p>
some text ...
<h1 id="introduction">Introduction</h1>
more text ...
I use this code to load the HTML into the WebView:
public void go(String location) {
try {
// read the content into a String ...
String html = NetUtil.readContent(new URL(location), StandardCharsets.UTF_8);
// ... and use loadContent()
webview.getEngine().loadContent(html);
} catch (IOException e) {
LOG.error(e);
}
}
Everything is rendered correctly, but if I click on the link named "Introduction", nothing happens.
The HTML however is correct, which I checked by instead using this code:
public void go(String location) {
// use load() to directly load the URL
webview.getEngine().load(location);
}
Now, everything worls fine.
The problem seems to be somehow because the document URL of the WebView is null when using loadContent(), but since it's a readonly property, I have no idea how to make it work.
I need to use loadContent(), because the HTML is generated on the fly, and if possible in any way, I don't want to have to write it out to a file just to make anchor links working. Is there a way to fix this?
EDIT
I filed a bug for JavaFX.
It's probably another WebEngine bug. A lot of that code is just a native libraries wrapped in api, so we can't modify it in runtime to fix some disabilities.
If you are able to change the structure of generated file you can implement scrolling to element in js:
<script>
function scrollTo(elementId) {
document.getElementById(elementId).scrollIntoView();
}
</script>
<a href='#' onclick=scrollTo('CX')>Jump to Chapter X</a>
<h2 id="CX">Chapter X</h2>
If you can't change the structure, there is some steps that I've made to try to fix it and some suggestions - at first I've set value of location by reflections after loadContent for sure:
Field locationField = WebEngine.class.getDeclaredField("location");
locationField.setAccessible(true);
ReadOnlyStringWrapper location = (ReadOnlyStringWrapper) locationField.get(engine);
location.set("local");
But in fact, keeping state of actual location is just an information for you and manipulating this changes nothing. I've also found a way to set url from js (just a long shot, we don't have any specific details why it's not working):
window.history.pushState("generated", "generated", '/generated');
Of course we can't because of:
SecurityError: DOM Exception 18: An attempt was made to break through the security policy of the user agent.
I think you should forget about loadContent(). You said that you didn't want to write generated content to file. A little dirty hack but really helpful for you could be wrapped http server on random and unused port in your application. You don't even need external libraries because Java has simple utilities like that:
HttpServer server = HttpServer.create(new InetSocketAddress(25000), 0);
server.createContext("/generated", httpExchange -> {
String content = getContent();
httpExchange.sendResponseHeaders(200, content.length());
OutputStream os = httpExchange.getResponseBody();
os.write(content.getBytes());
os.close();
});
server.setExecutor(null);
server.start();
You can also use another browser to display your page, e.g. JCEF (Java Chromium Embedded Framework).
I have a class name 'MonthReport.class.php' and its structure like the following:
class MonthReport{
.....
//some member variables
public function pieChart(){
........
//the image data comes from mysql and data belongs to a specified user
$myPicture->Stroke();
}
public function lineChart(){
........
//the image data comes from mysql and data belongs to a specified user
$myPicture->Stroke();
}
public function render html(){
$html.=str1<<<
.....
//some html code
str1;
$html.=<<<str2
<img src="$this->pieChart()" /> //can not work
str2;
}
}
when I call the pieChart() function with this in the place src it will overwrites my entire page and just shows the image.how can I do this?
I try to render the image in a separate page but the image need some specified user data eg.'userId'.in others words when i new a object, it specify the userId,so I can not render the image in a separate page.
sorry for my bad english!but I need your help!thanks in advancd!
Your question is a little unclear but if your problem is what I am assuming it to be, then I used to have similar issues (Graphic created that is just an image with all of the rest of my page content not displaying). My solution was to generate a temporary image using pchart then embed that file in the html
$myfilename = "temp_image.png"; // temp file name
$myPicture = new pImage(700,500,$myData);
// other image creation code....
$myPicture->Render($myfilename); // generate image "temp_image.png"
$image_html = '<img src="' . $myfilename . '">'; //generate the link
print("$htmlline");
Again there is some guesswork going on here as your question is unclear. The above works for me though and enables me to embed an image created on the fly by pChart into my php pages.
Scenario:
I have a ASPX (with no form element) let's call it Page A, the form contains a DIV that displays a ASPX page with a FileUpload Control in a form element, Page B.
Requierment:
Submit the form to upload the file, without Page A refreshing or navigating out and displaying the result of the upload in the DIV or Page B.
Problem:
When I hit the submit button to upload the file, the file uploads and Page A turns into Page B.
Any suggestion will be very appreciated.
Thank you,
You can use PreviousPage to do this.
1) Create a property in Page A to expose the file name o something else that you need to expose in Page B, for exemple:
public string FileName
{
get { return fileUpload.FileName; }
}
2) On the submit button event in Page A redirect to Page B
protected void btn_Click(object sender, EventArgs e)
{
/*Save file here*/
this.Server.Transfer("~/PageB.aspx");
}
3) Add the directive in Page B aspx that tell which page is the PreviousPage:
<%# PreviousPageType VirtualPath="~/PageA.aspx" %>
4) Use the public property in Page B to show the result to the user, for exemple put it in a label:
Label1.text = this.PreviousPage.FileName;
Hopes this help! Take a look here for more info: How to: Pass Values Between ASP.NET Web Pages
I have a scenario that I get an string with html data, this is not just html data it's an email (outlook) saved as an html file and dropped in the string.
Now this string needs to be formatted to an html document and should be a clickable link in a datagrid. So when I click on the link, the HTML document should pop-up and should gave me a nice HTML page that is readable for the normal users. I hope it's a bit clear what I want o_0.
I don't know where to start.
You can download the example html from here: http://www.mediafire.com/?b2gfwymw70ynxir
Thanks!
---edit
Hopefully I can explain it a little bit better. I need to create an link and when they click on it they get an HTML page.
The string variable has HTML data in it, to be precise, the source data of the HTML example above.
example:
public var html:String = source_code_of_example_file;
The entire source code of the HTML page is in my variable html. Now I need to make this an link and when they click on it, they will get the html page (as pop-up) on the fly.
You can use the htmlText property and then specify a CSS to perform the proper formatting:
<mx:TextArea id="resourceText" height="100%" width="100%"
styleName="resourceText" editable="false"
styleSheet="{resourceStyleSheet}" htmlText="{html}"/>
To read in the style sheet I declare it in the model:
public var resourceStyleSheet : StyleSheet;
It gets read in from an external file:
private function loadCSS():void {
var urlLoader:URLLoader = new URLLoader();
urlLoader.addEventListener(Event.COMPLETE, cssCompleteHandler);
urlLoader.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
try {
urlLoader.load(new URLRequest("folder/base-html.css"));
} catch (error:Error) {
Alert.show("Unable to load requested document.");
}
}
private function cssCompleteHandler(event:Event):void {
// Convert text to style sheet.
var styleSheet:StyleSheet = new StyleSheet();
styleSheet.parseCSS(URLLoader(event.currentTarget).data);
// Set the style sheet.
model.resourceStyleSheet = styleSheet;
}
private function ioErrorHandler(event:IOErrorEvent):void {
trace("ioErrorHandler: " + event);
}
This will get it into the model, but then make sure resourceStyleSheet is bindable when you use it (I actually set a bindable variable on the view that I set to the model value.
It's not really clear what you want to do.
If your problem is you need to show HTML formatted text in flex there is a component which can do this
http://code.google.com/p/flex-iframe/
-- update after edit
If your intention is to open a html popup once the user clicks on the link you could use ExternalInterface to call a javascript function to do this.
Hope it Helps
There is no easy way to display HTML in a flex web application(this is a web application, right?). Like Xavi Colomer said you can use the Flex Iframe but is terribly slow, it requires you to change the display mode for your swf to opaque and this can cause more problems, depending on your application.
You could open a new page in the browser that will be used to display the HTML. Something like:
http://www.yourcooldomain.com/bla/displayTheHtml.php?oneTimeId=jhsfg765437gro734
More info on how to do this from flex here.
On the other side(server) I assume that you keep this html messages on a database(?) so displaying them using php(or whatever you are using :P) should be easy.
If you are gonna choose this path be careful about the security: oneTimeId in
displayTheHtml.php?oneTimeId=jhsfg765437gro734
should really be an one tyme only id.