I am trying to download a file from server. The normal GWT RPC call doesnot allow me to do that, and hence I wrote a servlet to do that job for me. From the client side, I am creating a Frame object, and I set the servlet URL in it, and add that frame Object in my root panel.
When I execute this in IE, a window pops up asking for Save/Open file.
But when I execute the same in a Firefox or a Google Chrome browser, nothing is happing.
I am not getting any request on my servlet/server side.
Here is a slice of the code :-
String servletUrl = "http://localhost:13080/Browser/ui/dataExportServlet?level=ZERO";
Frame frame = new Frame(servletUrl);
frame.setVisible(false);
RootPanel.get().add(frame);
So, can someone please help me out.
This might be related to same origin policy.
Are both servlet and webapp running on port 13080?
If they differ, SOP might fail this.
If I understand correctly, IE has a more relaxed policy so it might work there but not in chrome.
See http://en.wikipedia.org/wiki/Same_origin_policy and Can I disable SOP (Same Origin Policy) on any browser for development?
In Chrome, you can use the Developer Tools (CTRL + SHIFT + I) to check if the IFrame is being added to the HTML, and if the frame's source is being set properly. You should also be able to see what content has been loaded into the iframe.
Alternately, set a breakpoint in your servlet to see if the iframe is being hit at all from Chrome.
I got the solution for this issue.
I removed the frames and added the following code :-
com.google.gwt.user.client.Window.open(url, "CSVDownload", "");
Now, this opens a new browser window, and then I get the pop-up to open/save the server side file in all 3 web-browsers. (IE, Mozilla FireFox, Chrome).
Thanks a lot!!!
Related
I maintain a vb.net website. A button on a page shows an AjaxControlToolkit.dll ModalPopupExtender. When I click the button, the page reloads, but no popup appears.
My tests below cover the scenarios I can think of. Please help me diagnose and fix.
This ModalPopupExtender succeeded in the past. The error might have started when we moved to a new server, or when we implemented https, or a browser update, or at some other time since then.
Tried Chrome (latest) and Firefox.
I RDPed into the server and opened the page in Chrome there. ModalPopupExtender succeeded. Same Chrome version as my PC. So, unlikely to be a code issue.
A different page on the same site uses ModalPopupExtender successfully. So, unlikely to be local PC settings.
I put lines of test code immediately before and after ModalPopupExtender.Show(). Both succeed.
Aha - found it!
Solution
The ASPX/HTML referred to http://ajax.googleapis.com. Changing the references to https made ModalPopupExtender.Show() work correctly for me.
Explanation/Diagnosis (if you can clarify further, please comment)
When I checked the html served to my browser, I noticed it defined a javascript function called fn(). The definition for fn() didn't appear in the html served to the server's browser. After the https change, fn() no longer appears in the html I receive. The other page, where ModalPopupExtender worked, didn't have any reference to googleapis.com.
I assume that using http instead of https caused ajax.googleapis.com to provide fn() and that fn() in some way interfered with the normal operation of my ModalPopupExtender.
Here's the fn() definition: (function {var fn = function() {Sys.Extended.UI.ModalPopupBehavior.invokeViaServer('ctl00_cphContent_ModalPopupExtenderConfirm', true); Sys.Application.remove_load(fn);};Sys.Application.add_load(fn);})();
Note: the http also included another javascript function related to the ModalPopupExtender. But there was a similar one on the working page, and in the working version served to the server's browser, and in my fixed version. So, I assume that function is correct.
GWT is used and the application is deployed on WebLogic using HTTPS.
The performance is poor and with F12 Developer Tools, we could see that blank.html is downloaded multiple times. This is clearly related to GWT but we have not been able to figure out why.
The following is from javascript:
defineSeed(2613, 2614, makeCastMap([Q$BaseModelData, Q$ModelData, Q$Theme, Q$Serializable]), Slate_0);
var SLATE;
function $clinit_GXT(){
$clinit_GXT = nullMethod;
IMAGES = new XImages_generatedBundle_0;
MESSAGES = new XMessages__0;
SSL_SECURE_URL = getModuleBaseURL() + 'blank.html';
}
This is from GWT.java:
/**
* URL to a blank file used by GXT when in secure mode for iframe src to
* prevent the IE insecure content. Default value is 'blank.html'.
*/
public static String SSL_SECURE_URL = GWT.getModuleBaseURL() + "blank.html";
Does anyone know under what circumstances blank.html is called?
Thanks!
This is from GWT.java:
This is actually from GXT.java.
This is used in a few cases when creating an <iframe> element, so that IE won't give errors if your site is hosted from SSL. I can actually only find one case (as of GXT 3.1.1) which uses this, in Layer.java. Only IE pages loaded from https urls will make use of this.
The Layer class uses this as a "shim", a way to prop up some DOM elements above overs, and work around some browser bugs (typically plugin or iframe related). Menus and popup dialogs use this to ensure that they don't appear "underneath" content that they should be "above".
This file is very small - just enough HTML to convince IE than the iframe has correctly loaded, and no more. It never changes, and should load nearly instantly.
As far as performance goes, this should only happen when a Menu or Window/Dialog/Tooltip is shown - these shouldn't be happening on app startup usually, at least not more than a window or two. Additionally, the browser should recognize that it is loading the same element and cache it correctly, and not load it multiple times (though it might be listed several times as hitting the cache). If the server has instructed the browser to never cache the file, that is something you should look at changing.
In short, this is very unlikely to be the cause of any performance issues, at least in GXT itself. If somehow you have the shim enabled on every single widget in your project, this should not be required. If the file is loading slowly, something may be very wrong with your server configuration.
For reference, here is the entire file:
<html></html>
recently I had to remove my entire cache to be able to view a webpage I was working on. This is fine I guess but it could be improved by removing specific pages from the cache.
the chrome.browsingData.remove, seemingly has no option for indicating individual pages for removal. I was wondering if this could be done externally, but I am not familiar with the chromium code. I was also wondering if there are any planned changes to the chrome.browsingData.remove implementation.
Many thanks
To remove a single file cache enter its URL into browser and do hard refresh.
If you are working on a webpage and wish to avoid caching (btw, it's recommended! :) You can do it today in Chrome DevTools.
Go to Settings (the icon in the bottom-right corner) and click on it.
Then, you will have an option 'disable cache' - mark it and you done.
Just don't forget to return this state when you done working as chrome will be faster with its caching schema.
Edit 10/Feb/2022: Access the remote dev tools documentation for a whole suit of tools available to override cached files while developing:
https://developer.chrome.com/docs/devtools/storage/cache/
If you are attempting to clear HTTP cached data, which was the original question in the post, then the network log is where it is possible. the guide for that is here:
https://developer.chrome.com/docs/devtools/network/#load
First find the file then release its cacged content by right clicking:
https://developer.chrome.com/docs/devtools/network/reference/#clear-cache
To remove all files (not single files) while in Chrome DevTools you should click on the Dev Tools settings then choose
"Disable cache (while DevTools is open)". This was the first option on the page - it is now (as of Chrome 103 in 2022) under network in Preferences.
Note that these settings are not the main Chrome settings, but are specific to Dev Tools.
You can reach DevTools by pressing F12 while on a web page you want to debug or by pressing Ctrl-Shift-I.
Edited 28 July 2022
If you're building the page dynamically, then during development, you can put a random string at the end of the URL used to load the script.
<script src="path/to/script.js?_=<%=Math.random()%>"></script>
This will cause a cache miss for that file but will use the cache for everything else (subject to cache-control headers and so on). Just remember to remove the parameter before pushing to prod!
UPDATE : 2019, April 20
Lately, I'm working with Chrome browser's inbuilt feature - Overrides. With this feature, we can write code for HTML, CSS, JS, etc directly in the console and see it on the web-page.
Here's a tutorial that might be helpful
Previous Answer :
I'm working with Google Chrome extension Resource Override.
After installing this extension, I'm overriding the resource which I want from the server instead of cache:
STEP #2 : Override the resource which you want fresh from the server:
⭐Important Note - Access the plugin from the developer-console instead of the browser
⭐⭐ I started with this approach but have moved to approach suggested by Lukas Greblikas in the answer above.
Good Luck...
Selenium is able to load Chrome Frame pages. The problem is that once you load the page in IE with Chrome Frame plugin, the tag appears as empty. Selenium tries to identify elements using the DOM structure, but the way IE and Chrome Frame plugin works, rendering
and DOM tree are taken over by the Chromium code and IE gets an empty DOM.
So i guess, selenium doesn't support IE with google frame add-on installed on it?
Has anyone worked around this problem?
Thanks
This question has been asked and answered on the Selenium user's mailing list. The IE driver doesn't work with the Google Chrome Frame add-on, and there are no plans to implement support for it to work with the Chrome Frame add-on. Either you want to test the operation of your website under Chrome (in which case you should use the ChromeDriver), or you want to test it under IE (in which case you should use the IE driver). If you can point to a specific case where using the website with the Chrome Frame add-on behaves differently than the way it behaves with the Chrome standalone browser, you might be able to make a case to revisit the issue. Furthermore, remember that Selenium is an Open Source project, and you are welcome to make changes and submit patches to the code at any time.
Watir WebDriver has the same issue.
Selenium core, the part that loads in the target browser and executes tests does work and can be run independently. So, if you have a Selenium test suite in HTML form, it can be run in GCF using the following steps:
Configure a web server to opt all URLs into chrome frame using HTTP header as described here: http://www.chromium.org/developers/how-tos/chrome-frame-getting-started#TOC-Making-Your-Pages-Work-With-Google-
Host your test suite under '/tests' folder on this web server. Lets say the suite is my_test_suite.html.
Host the selenium core folder as the '/core' on the server
Now restart the server.
Run the suite with this URL: http:///core/TestRunner.html?test=tests/my_test_suite.html&auto=true
We've got an Eclipse RAP application that's behaving a bit strangely in Firefox - two distinct problems.
When you browse around, you can click on a button in one part of the system. This opens a popup window like so:
IWorkbenchBrowserSupport bs;
bs = PlatformUI.getWorkbench().getBrowserSupport();
int style = IWorkbenchBrowserSupport.AS_EXTERNAL;
IWebBrowser b = bs.createBrowser(style, getRandomID(), "Hello world", "");
b.openURL(new URL(...));
where the URL is another servlet in the application. This servlet is in the same runtime, but has nothing to do with RAP - it takes a binary blob from in-memory storage and dumps it in the output stream.
Problem 1: This causes the HTTP session to die in firefox, and shows the "session expired" RAP error page with a link to restart the session.
Problem 2: Now, when you click on the link to restart the session, it shows the application's dialog again, but the session expired error is shown again the moment you do anything. This prevents the user from using the system again, unless Firefox is closed down completely and restarted. A quick peek with FireBug reveals that the JSESSIONID passed by Firefox does not change.
Has anyone seen this before?
How long is the dumping of the stream to the output? May it cause a timeout? As RAP uses Javascript calls, it might be much shorter than the normal timeout time.
For problem 2: Firefox caches a lot of things; and if the Javascript execution hangs, it might cause such problems.
Are these problems present in other browsers? It might be a good idea to check with the internal browser (or any other browser with a different rendering engine).
It turns out that if a RAP application opens a popup window pointing to a servlet in the application itself, inside the current HTTP servlet context, the session is killed. Fixed by creating a dummy HTTP context for the servlet in question.
If you need to deliver content from within the same application, you should use a service handler instead. See this FAQ:
http://wiki.eclipse.org/RAP/FAQ#How_to_provide_download_link.3F