I have found a useful billards physics library in Borland delphi for my hobby project. The code is object oriented(in Object pascal). I want to visualize it using webGL (javascript) in chrome browser.
The idea is, I should have one call to make from the javascript which will access the interface from delphi lib and give me the new position, rotation and scale values in respective array.
For this I want to develop an NPAPI lib Scriptable plugin in Delphi(Meaning NO UI only lib of APIs).
1)I want to export those necessary physics APIs from the Delphi via this NPAPI plugin and access them in my html page using JavaScript. I am targeting chrome.
2) Any simple "hello world" tutorial or article related to this will be highly helpful.
3)Any help on using Firebreath to achieve the same is most preferable.
How to use Delphi with Firebreath?
use a good HTML / JavaScript editor (for example the NetBeans IDE) create a basic HTML page which contains the "hard-coded" JavaScript to display the initial scene, and a HTML form to accept user input
use Indy or Synapse to create a HTTP server (in Delphi), wich serves this HTML page and when the user submits form input, parse the form parameters and pass them to the billiard simulation, which should emit a list of graphic commands as a result - and convert these to WebGL (this is the hard part) statements
from the HTTP server, send a response (HTML document) back to the client, with the JavaScript / WebGL statements embedded, so that the client will see the animation and the new playfield state
repeat until end of game
Create a COM DLL and install it on the client's machine. Then Javascript can use its ActiveXObject class to access the COM object (or, under IE, you can use the <object> HTML tag). Make sure your COM object implements the IDispatch interface, as Javascript needs to use late binding since it is an interpretted environment and not compiled.
Related
I am developing a native android app using HTML/CSS/JavaScript. During the App flow, I need to permanently delete certain HTML files (stored locally). Can this be done?
I am a high school teacher trying to develop an educational app. I have basic knowledge of HTML/CSS and near zero knowledge of JavaScript!
modern broswer support javascript file operation but this file system is only in broswer and isolated from local files, refer https://developer.mozilla.org/en/docs/Web/API/File
if u do need delete file on android system, then u need your app provide a bridge to and call from js, run in app, in java code, delete the file
the code might look like
JsBradge.delete(file)
Javascript disigned as a web document script language, so it has many security essentials, such as absolute isolation in browser, which means no write acces to file system.
So, you have two options - first is create your own bridge to java, for example call prompt('your_file_name'), catch it in java and delete your_file_name.
Second - use any of mobile app framework, for example - Cordova.
Sorry, but no easy ways =(
I would like to develop themes/plugins for WordPress based on React. To make it search engine friendly, I need it to be rendered initially on the server (serverside-rendering).
The only way to do this, as far as I know, is to use react-php-v8js, which requires the PECL V8js extension. This is a problem since I have no control over the platform on which these themes/plugins will be run.
Is there a way to make React and WordPress work together without having to install additional extensions? Perhaps by building/compiling React files into PHP?
There's an article that describes how to do this:
https://sebastiandedeyne.com/server-side-rendering-javascript-from-php/
But it's a fairly complex setup and it requires using composer. That can be difficult in Wordpress projects since Wordpress tends to completely eschew the modern php architecture.
If you're looking for a library to help with SSR in PHP:
https://github.com/spatie/server-side-rendering
Best of luck on it.
If you want your content to be indexed by search engine without js, you can print your minimal content using Wordpress, just the bare minimum + crucial meta tags, maybe localize some initial state for your react app to boot. A bare bone theme such http://underscores.me/ would be sufficient. When js is available, you can replace your whole WordPress generated content with React ones.
The ideal one is to have React generate the content for you. But it's hard until we can see that nodejs / PECL V8js extension available everywhere.
If you can at least install nodejs and launch a node process then it should be ok, although not so simple.
You would need to generate a ssr version of your assets and use it in a node process that would listen on a socket to write the html result..
In your controller you can create a socket to your node process (something like stream_socket_client(...)) and then you can send a dummy function written as a javascript string to that socket (something like stream_socket_sendto($sock, "getResultForMyWidget(someParams){...}")). That function would be evaluated in the node process that would return the response to the controller (the html response as a ReactDOMServer.renderToString from the component you want to render).
That's it for the big picture.
There is a symfony plugin that illustates it very clearly (see this github) and comes with a dummy server node process to illustrate how it handles the socket listening and eval of the incoming function and returns the html result. See also the example in the sandbox for a bigger picture and in depth implementation. You should be able to adapt it to wordpress.
Here is a use case. I need to:
Invoke JavaScript from .NET (C#) code
JavaScript won't be compile, it comes from a dynamic source
I need to pass .NET objects to that javascript code, preferable a dynamic object
I also need to receive objects back from this javascript code
I need this code to run in WPF (Windows 7) & Windows Store (WinRT)
So far I've only seen activation of Windows Script Engines (i.e. IActiveScript) or using open source project.
I would prefer to stay clear of Open Source project and would prefer to use IE JavaScript engine (Chakra). Windows Script Engine doesn't seems to work on WinRT. I can live with hosting a browser in my app as it is a UI app.
Code doesn't need to be identical in WPF & WinRT (I can write something to wrap the two implementation behind an common interface).
How can I do that?
Chakra does not expose a public hosting interface, so you won't be able to do what you want without hosting something like V8 inside your application.
Another option for the metro app would be to build the main app in JavaScript and call out to WinRT objects written in .NET for the majority of the work. Won't help you in WPF though.
I am working on project that allows to read document within the browser without the need to install software , It's a part of a management application for companies.
I tried out to work with iTextSharp ,PDFSharp , but these labrories don't allows you to do what I want to do.It's just for generating pdf from HTML.
I checked out for another solution , I found an interesting project developed by Mozilla Lab . Mozilla is working on technology that will allow PDF documents to be rendered within the browser, rather than utilizing a browser plug-in or an external app to open them.
https://github.com/Marak/pdf.js/
I wonder to know Can I integer this script and use it with ASP.Net ? , If yes , I will be pleased to be guided by you with code source or external links that you recommend in order to implement this solution.
I believe that link you have sighted is about creating PDF file in browser (and not about showing existing PDF in browser).
Said that, there is another interesting project pdf.js that is trying to render PDF using java-script and HTML 5. Its essentially a java-script library that takes PDF bytes and attempt to render them. As such, you should able to integrate it in any web site regardless of server side technology - include the script and make relevant calls. See this simple example to get started.
What I need is simple: we have a console app project. We want to have such a function that would open a simple window with nothing but html QtWebKit html+js rendering window that would read some default html+js string (form string or const char*). we want to have our own api joined with default js api so that when JS calls some our.function(argument); we would have our C++ application performe some function and for example cout argument. How to create such thing using Qt?
PS: this question is related to my previous one , I just suddenly got Idea that doing it once for all platforms would be much better.
Have a look at QWebFrame::addToJavaScriptWindowObject(). It lets you expose a C++ QObject to the javascript in your page. Your html+js can then call C++ methods on that object from the web page.