We are using dojo's dojox.form.uploader.FileList in our application to show the progress of file upload. But it shows the name of the file, type extension by default. We could not see any settings to hide it or getting a handle to that. Is it possible to get a handle to that object which has file name, size and extension? Could you please help us?
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I'm making an application with WebView control. And I want it to read local html file. But I can't find the right way to make it possible.
At first, I simply tried to use Navigate method and provide the file path in the "file:///~" format string as a parameter, but it didn't work.
https://learn.microsoft.com/ja-jp/windows/communitytoolkit/controls/wpf-winforms/webview-known-issues
This Microsoft page says that WebView control does not recognize "file:///~" protocol.
And it shows the 3 solutions to make WebView control to read local html files.
Use NavigateToLocal() method.
Use NavigateToLocalStreamUri() method.
Use NavigateToString() method.
I tried all of them, but each 3 have some issues that doesn't make it work.
NavigateToLocal method requires a RELATIVE path of the file (not the absolute path), relative from the application executable directory. So files in somewhere else from the application directory cannot be read by this method.
NavigateToLocalStreamUri method is not even implemented according to the page! I once tried it anyway, but it returned an exception and didn't work.
NavigateToString method can render the given html content string, but the external files like css, js, image files included by html codes cannot be loaded, so it does not provide a full function.
I found some sample of using NavigateToLocalStreamUri method and tried it by myself.
(VB.NET)
wvwMain.NavigateToLocalStreamUri(uri, New StreamUriResolver())
Public Class StreamUriResolver : Implements IUriToStreamResolver
Public Function UriToStream(uri As Uri) As Stream Implements IUriToStreamResolver.UriToStream
Return New FileStream(uri.LocalPath, FileMode.Open)
End Function
End Class
By this code, NavigateToLocalStreamUri method returns System.Resources.MissingManifestResourceException.
What I want to realize is very simple.
Using WebView control
Read local html file located anywhere on the local storage
And render the html file completely as an expected result
But I don't see the way right now.
I would appreciate your advises or helps.
The method NavigateToLocalStreamUri will not work. Please see https://learn.microsoft.com/en-us/windows/communitytoolkit/controls/wpf-winforms/webview-known-issues.
You have to use NavigateToLocal, but you will see a warning that it is deprecated. However, it does only work with relative paths. Is it possible for you to restructure your application so that you can use relative paths?
The NavigateToLocal method is the only way that I've found to call local HTML files in Microsoft.Toolkit.Forms.UI.Controls.Web WebView v6.0.
On Visual Studio 2019 Windows 10, the following VB.NET code works on my PC
Imports System.IO
Dim sFileName = Application.StartupPath & "/MyPage.html"
wv.NavigateToString(System.IO.File.ReadAllText(sFileName))
where wv is a WebView object.
I have an MHT (Microsoft web archive) file that I have added to my project folder. I need this file to display in a WebView on a help page. I have set the file's build action to "Content," like this question reccomended. I then use this code in the page's Loaded event handler.
Try
Dim strHelpNavigate = Path.Combine(Windows.ApplicationModel.Package.Current.InstalledLocation.ToString(), "\MyAppsHelp.mht")
webHelp.Navigate(New Uri(strHelpNavigate))
Catch ex As Exception
webHelp.NavigateToString("<html><head><style>body {font-family: segoe ui; color: white; background-color: black;}</style></head><body><h2>Sorry, the help page is currently unavailable.</h2></body></html>")
End Try
This code produces an exception: {"Invalid URI: The format of the URI could not be determined."}
I have also tried passing "\MyAppsHelp.mht" to the Navigate method like this question reccomended, but this produces the same exception, and I see from the Local window that the string passed to the Navigate method is the same either way.
Does anyone have any advice on how to display this file in the WebView?
WebView does not natively support HTML archive files, but you can do the work convert these files to html + images if you're so inclined.
Open the .mht file in notepad, and you'll see that there are separate sections for each part of the HTML file - you can parse these sections to get the HTML out, then the base64 encoded images, then save them in your local app folder and use WebView.NavigateToLocalStreamUri to load them. See http://blogs.msdn.com/b/wsdevsol/archive/2014/06/20/a-primer-on-webview-navigatetolocalstreamuri.aspx for details on how to use this method.
OF course, if it's a static file that you will be using all of the time, it would be far easier to just convert it before packaging the app.
How would i know file document is corrupt or cannot be loaded in PSPDFKit?
How delegate method should i implement in PSPDFKit to know document is corrupt or cannot be loaded?
The problem is file document does exist?? but don't know is file corrupt or not.
If i know then could download new file document if its corrupt.
Thanks you all !!!!!!
this is the main developer of PSPDFKit.
You can use the [document.isValid][1] property to determine if the document source is valid or not.
My iOS app loads a variety of documents using QLPreviewController. My aim is to set a flag if the document loaded properly and show an error if it didn't.
Curiously the QLPreviewControllerDelegate protocol offers no callback to check this, nor does the QLPreviewController seem to throw any exception when I try to load an invalid file.
For the record, I tried loading an invalid PDF and it simply logged a message about not being able to find the header and displayed an empty file.
Can anyone please tell me how I can figure this out?
Thanks!
If establishing whether an item could be displayed beforehand works for you then a call to the following may be an option:
+(BOOL)canPreviewItem:(id<QLPreviewItem>) item
I'm creating an iOS5 app (programmed in Objective-C) which provides a couple of functions. One of them is to allow a user to fill out a text field with JavaScript. When the user presses a "Test" button, I want it to save to a specific JS file and move to a new view, displaying an HTML page that will display the results of that JavaScript on a canvas element.
Unfortunately for me, I have no idea how to save to a JS file for a text field. Nor do I know if this is actually the best way to achieve the results I'm after.
So can anyone tell me the code I'd need to place in the IBAction of my test button to save the file, or if there is a better way to get the user's script into the HTML file with the canvas element?
You have some options to do that.
Add a callback in WebView is possible only in desktop apps, but you can make a workaround.
1- Set a handler to click in javascript;
2- This handler parse the value via windows.location (trying to change the current url);
3- In UIWebviewDelegate set webView:shouldStartLoadWithRequest:navigationType: to recognize this values parsed by javascript and returning NO (canceling the url change).
After you have the code typed by user, is easier pass to the new one UIWebView. You can save the file via NSData or other class and load in by the path, or you can parse directly the code to be showed via NSString.
EDIT
I, still, belive what I said is what you want, but with a little more info. Yes, 3 NSString probably solve your problem. You even can call eval in javascript, via objective-c and parse user code too. Those logic ideas are a good approaching. You can choose the easier for you.
There are more info in this another Q&A
You can use html 5 local storage for that.