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Wt (web toolkit)

From Wikipedia, the free encyclopedia

Wt
Original author(s)Emweb
Initial release1.0.0 / December 2005; 18 years ago (2005-12)
Stable release
4.10.0 / May 30, 2023; 8 months ago (2023-05-30)[1]
RepositoryWt Repository
Written inC++
Operating systemCross-platform
TypeWeb framework
LicenseDual-licensed:
Websitewww.webtoolkit.eu/wt

Wt (pronounced "witty") is an open-source widget-centric web framework for the C++ programming language. It has an API resembling that of Qt framework (although it was developed with Boost, and is incompatible when mixed with Qt), also using a widget-tree and an event-driven signal/slot system.[2]

The Wt's design goal is to benefit from the stateful component model used in desktop-applications APIs, applied to web development—instead of the traditional MVC (model–view–controller) design pattern. So rather than using MVC at the level of a web page, it is pushed to the level of individual components.[3]

While the library uses a desktop software development process, it does support some web-specific features, including:

One of the unique features of Wt is its abstraction layer of the browser rendering model. The library uses Ajax for communicating with browsers compatible with it, while using plain HTML-form post-backs for other user agents. Using a progressive bootstrap-method, the user interface is rendered as a plain HTML document first, then, provided its support in browser, it is automatically upgraded to use Ajax for increased interactivity. In this way, Wt is by definition:

Because of the popularity of C/C++ in embedded system environments, Wt is often used in such devices and (as a consequence) has been highly optimized for performance.

YouTube Encyclopedic

  • 1/5
    Views:
    78 384
    23 203
    1 887
    33 637
    3 100
  • Hello World - GWT Tutorial (Google Web Toolkit)
  • Introduction to web development in C++ with Wt 4 A server-side web framework written in C++
  • Webpages are now webapps (witty/Wt)
  • What is Google Web Toolkit - GWT Tutorial
  • Wt (Witty) Install -part1a.avi

Transcription

hey everyone this is Rodrigo Silveira with http://www.easylearntutorial.com and this is tutorial number four over our Google Web Toolkit tutorial series and in this tutorial just following the game plan for this series we are going to do a hello world demonstration and as you you know already deputy is not the best to the you wanna use for a very true to HTML application from the gonna use it for something that you could easily do you know using Notepad or something that's simple and not really complex then you probably don't wanna use deputy but for this tutorial I'm just gonna be showing you how to set up a new project and the main thing I wanna show you is the the browser apply again that they gonna need and how to run it from eclipse so let's get started first thing you need to do is pull a free clips hopefully you already have your the Google Play gains set up in Eclipse if you don't check out the previous tutorial wanna do there's three ways to strengthen your project you can't go to five new a project if you don't see here you can go to other issues new project or you can just click this thing right here in play again button recruits for you a I don't like this method because this option right here sample code doesn't always show and that's very important and I you can just right click your projects right here and do the same thing create new project and if you go this way you need to go down to find inside the options US is Google and shoes web application project I'm just gonna do it use and this option just because that's why we installed the PLO game right there and if it does it is optional here I could be there you know us this thing is no stress down Secours everything make sure you stressed the window well gonna do is first uses creative project name and I'm just gonna call this thing guilty for is one tutorials GWT tutorials and then the package name for a No a whole lot about Java packages second my video that I've done explaining it there's a link for it in a description of the video but in my case I just call the comp got is online tutorial Tory all singular dont GWT and that's all and then the location israeli this is where you can sack for you STK if you just downloaded everything from from clips you my only have one so you'll have one option but if the download em if the download the SDK from the website separately you can add a bunch of them and then you can choose different versions I'm just gonna use 2.4 which is the latest so check down we're not gonna be using at Pigeon Renault so make sure you one sec distant and make sure you unchecked also way says sample code and sector make sure it's not you if you create if you choose to create generally a simple project is gonna create this whole thing they just says hello but he does like servlets and a bunch of extra stuff that we don't need right now so on Sackett we're gonna create an empty project so quick that is gonna take a little bit and eventually our project to show for you and all we're gonna have is basically s force folder here in war inside we're gonna have web and which is for your servlet stuff I for enough familiar with that that's fine we're not going to use it inside here the only Packers we have is our I'm a package that would create it and nothing in it so the first step now for the next step right click the package shoes new other and find Google Web Toolkit down here or you can just type its used to be the rate case actually need to type is moslem me as well we're gonna create so either you search for Google Web Toolkit down here should be somewhere over here and we're gonna create a new module were like you said you can just type in the word module and that's what we want click Next make sure he goes in our package to create it inside the source for their should be the default or anything related to to name is a module Mexico rolodex wood in the moslem so for now let's just call it hello world that's fine with finished it's gonna create two things for us a new package called client insider is a sub package and then inside the the route packets is gonna create is apec is named to GWT directs and now and this is gonna be is called the manifest it is basically explains our application and the most important thing we don't have the right now but is gonna define the a true point is like where to begin the application when we run it so two things were going to do one right away we're gonna rename the module so inside the module a node go ahead and add an attribute called rename Daz re name dashed to equals quotes and we're gonna call it hello and I'll explain why I'm doing this this is helpful but knots non-mandatory stops in a book you should do it because it's awful next thing right click the sub package dot client shoes new other and we're going to create an a three-point class again you can just type that in here and your point by which is going to Google where two kids and choosing an entry point class Tuesday click Next again make sure it's inside your package that's the client package we created the module name refers to this guy right here so that should be the default a brave have multiple packages and more or motor pool modules you can select them from you by clicking the Browse pretty much they should be default only thing you worry about is the name I'm gonna call this guy home you can emit anything really you could have been a min hello whole I just wanted to be a different name so to get a confused with the module name and this is just a plain old Java class lemme when you create a new class this way is going to change your manifest and is that in this thing really sister created a new a three-point it added the entry point which is the first anal be executed when this month loads again for more information check out the next video where explain all the details you and and this is where the classes fully qualified name so this is basically a regular Java clinton's always special thing is that it implements this interface a three-point and has dysfunction that's pretty much like to remain is the first thing that gets executed and that's why when it's to to to create all we're gonna do in here is typed route panel and if you don't have to the the package imported it's okay just keep reading it through panel done get and it will prolly imported for you manually or you can press control shift 0 and is going organizer imports solar panel died at dot add and we're gonna just add a new label and the text in the label will be hello world exclamation mark and you're going to have to import label and there's a bunch of possible options I just normal press control shift 0 energy issues little bit a common sense where it could this package pot prop possibly becoming from do it in and really make sense is Google GWT and label is like a say you I element something we're gonna be display so makes a lotta sense that is to stop one and that's what it should be user to a client are you I don't label is to practice so important that and we're good to go last thing we need to do is have what it's called the host HTML file to do that you go to war direction right click it new other and then again this is just an estimate of I'll so you don't have to use the Google Web Toolkit version a single page but this is a helpful to choose this version this option is set up just a regular file name interest amount and I'll show you why so make sure it's in your ward directory and your project I'm just gonna call this guy intact studies to mount call it whatever you want and then as an option right here make sure you always stressed this thing so it doesn't hide possible options the ups in the is says ray he is supports for browser history we don't want it so just delete it and this is a nightline Avastin now go ahead and click Finish so this is why you should get is just a regular HTML file 130 at a point now if roe at a new things to your project and or using this Google Web Toolkit options this is what's recommended because anything you change in a project you need to know how that affects the rest of the project so for instance for created a few points you should have known that the would require these new mine in your manifest if you let eclipse do it for you you don't have to worry about it and it avoids the chance of you making a mistake same thing with the HTML file if you just create a brand new regular HTML just say 50 I just your regular file and just to name a decent now you would need to add this line ready by yourself and this is a true your javascript import but this is why you need to know is how to report to the JavaScript or what the path would be that refers to this club class ready and basically the class for the past to your class reference point is the fully qualified name overclass so to be calm is like to torture deputy client died home would be over here this whole thing slashed p.m. been a milieu the entry point the name of the module rather which is hello a job but no cast such as: by renaming it to hello band the path to is simply hello is the name of the module and hello again it's the same thing twice hello dot no case to JS that refers to this module right here which behind-the-scenes refers to your or the first is gonna load is your entry point and that's why it needs the fully qualified name of the file which Israeli so what will happen and I'll explain this in more details when you load this page the is gonna look for this file ready says we're not compiling the project to have the file over here been the magic of the greats play again and the servers that he uses will come into play and is basically gonna come for testing in real time is gonna compiler to bytecode and send it to a recent now for their you're gonna need a plugin for your browser and chrome obviously has a plugin for it and Firefox says one maybe even I E but if you're reading chrome which is what I recommend just so you can follow the tutorials go to Chrome Web Store and they do a search for Google where toolkit and why you need the let's just say with its plaguing I have a link directly to the plugin well if it if you can find it like I feel right now well we need to do now that we have the host page the module and the entry point is to run the entry point ever that which is from the project one thing I want to say before you run it we're just gonna run this configuration sometimes what what eclipse is gonna do is create a little server is tested it rather project on the server but sometimes that fails because it tries to run on the same port like a default port so while I want to do is click on this little arrow next to this little blue icon the runs or go to run and then find ways says run configurations or click the little arrow ago reckon Fig rations find your project name soul right now my project is the OT GWT tutorials you can type that in him and it was so your project or you can just go through this list of options to hear and we're looking for a web application and then that im over project click that and then it will show you all this option said why you wanna do is go to servers and like I said is eclipse will create a server is tested it and try to run import 88 88 if for some reason you have some program in your system that's running on this port where the has reserve the port than eclipse in crass it will crest for your your application here will now run so what I like to do just to avoid that is to click automatically choose and selected ports solar eclipse is gonna choose a port that is guaranteed to be available and they do the same thing and it quits over him automatically select a new sport so make sure those to Ted for check boxes are checked click Apply and then run and if you click run and then you get errors in the console war nothing happens over here usually you should have a URL with him that's where we're gonna run the project if that doesn't happen and again 10 their issue then go ahead and click Ron make sure the extra point classes what selected week run and then it should give a distinct first and this is a an education if we go see this thing is an indication that something is prolly gonna run why you want to do is choose the first one web application and don't use this one choose the one that doesn't mess and servers or anything and then they should if everything is right you can see the status and a console and stuff logs everything but eventually hear you should see the the ports the ordered the address reno's you for me 88 88 in the 90 97 know which is fine I don't know I reverted from my run configurations on adjustable check these two guys I was kinda weird applying and then go ahead and run again it was so now it's a different port if you just double click it and lemme shrink my window in case you can see it if you double-click this thing is going to open on the default browser or you can choose a different browser or I usually just copy it and go to my browser were here and load it if you don't have the play again for for the browser you using you gonna get this thing right here go ahead and just click this thing they were taken to the proper location added to Google Chrome yes we do good staying down here is gonna download it and install it for you and when it's installed and everything is good and I'm busy I'll have to do it once when it's installed or if it's already installed on when you try to run a great application and make sure when you're trying to run these URLs go back to eclipse and development make sure this thing is red meaning that it's running and you can turn it off when you try to go to the URL you gonna get the little icon over you the if it shows a little warning saying you need to to enable it just click Enable if needed refresh and then eventually it's gonna load and this is all done again this tutorial pretty simple but this is a label widgets that comes with great and you can see is just a Dave has all the stuff if you look at network repression its downloading the No KS and it says so in this is shows the great magic how we compile those things from by code into highly optimized JavaScript and then a downloads some other things that I won't get into in this tutorial for all practical purposes this is the hello world solo work for just a simple string like that but just before I let you go the less you wanna show you is something that's really cool about quit normally for running things on a server and their deployment and compiling it you have to recompile stuff and you know run it again and so on and so forth and where it's we can just make changes to the project so for instance I'm gonna take this label definition out here and I'm gonna have a the Privett label maybe just and MSG for message it was new label and then that's what I'm gonna pass into my panel like them make sure there's no errors so you don't have to try to recompile it stop the server the server is running already so you can just go back to eclipse refresh not to say nothing changed but if I change this and say hello world like that you will get you know you get updates real time one thing is to donate to what they're going to say the first time face open the URL it might take a while to load everything but then after that for deliver browser ready and leave the project reading then any refreshes would be pretty easy pretty fast one thing is if you crash something if you have a missed a IQ your Java won't compile and then you try to repress it you gonna get some sort of exception just saying you know something is broke a if you throw an exception this right now is a a syntax error so im won't display anything you you just say the server is messed up but if it through an actual exception you gonna get the stack trace right here that's helpful but you can always go to your Eclipse and this will tell you what the problem is in this case which uses syntax on 99 interests and Colin so you do so save it refrains and life is good again so pretty simple tutorial I know a lot of steps but some other the gotchas but I think are important the so next tutorial that I explain the widgets entry points the manifest the host page everything so be sure to check that out a place like this video if this was helpful post your questions and comments with this video and be sure to subscribe thank you very much

Major features

For a more detailed overview, see the Features section of official website.

Code example

The "Hello, World!" program in Wt:

#include <Wt/WApplication.h>
#include <Wt/WBreak.h>
#include <Wt/WContainerWidget.h>
#include <Wt/WLineEdit.h>
#include <Wt/WPushButton.h>
#include <Wt/WText.h>

/*
 * A simple hello world application class which demonstrates how to react
 * to events, read input, and give feed-back.
 */
class HelloApplication : public Wt::WApplication
{
public:
  HelloApplication(const Wt::WEnvironment& env);

private:
  Wt::WLineEdit *nameEdit_;
  Wt::WText     *greeting_;

  void greet();
};

/*
 * The env argument contains information about the new session, and
 * the initial request. It must be passed to the WApplication
 * constructor so it is typically also an argument for your custom
 * application constructor.
*/
HelloApplication::HelloApplication(const Wt::WEnvironment& env)
  : WApplication(env)
{
  setTitle("Hello world");                            // application title

  root()->addNew<Wt::WText>("Your name, please ? ");  // show some text

  nameEdit_ = root()->addNew<Wt::WLineEdit>();        // allow text input
  nameEdit_->setFocus();                              // give focus

  auto button = root()->addNew<Wt::WPushButton>("Greet me."); // create a button
  button->setMargin(5, Wt::Side::Left);                       // add 5 pixels margin

  root()->addNew<Wt::WBreak>();            // insert a line break
  greeting_ = root()->addNew<Wt::WText>(); // empty text

  /*
   * Connect signals with slots
   *
   * - simple Wt-way: specify object and method
   */
  button->clicked().connect(this, &HelloApplication::greet);

  /*
   * - using an arbitrary function object, e.g. useful to bind
   *   values with std::bind() to the resulting method call
   */
  nameEdit_->enterPressed().connect(std::bind(&HelloApplication::greet, this));

  /*
   * - using a lambda:
   */
  button->clicked().connect([=]() { 
    std::cerr << "Hello there, " << nameEdit_->text() << "\n";
  });
}

void HelloApplication::greet()
{
  /*
   * Update the text, using text input into the nameEdit_ field.
   */
  greeting_->setText("Hello there, " + nameEdit_->text());
}

int main(int argc, char **argv)
{
  /*
   * Your main method may set up some shared resources, but should then
   * start the server application (FastCGI or httpd) that starts listening
   * for requests, and handles all of the application life cycles.
   *
   * The last argument to WRun specifies the function that will instantiate
   * new application objects. That function is executed when a new user surfs
   * to the Wt application, and after the library has negotiated browser
   * support. The function should return a newly instantiated application
   * object.
   */
  return Wt::WRun(argc, argv, [](const Wt::WEnvironment &env) {
    /*
     * You could read information from the environment to decide whether
     * the user has permission to start a new application
     */
    return std::make_unique<HelloApplication>(env);
  });
}

See also

References

  1. ^ "Wt: Release notes". www.webtoolkit.eu. Retrieved 2022-04-20.
  2. ^ Dumon, Wim; Deforche, Koen (February 11, 2008). "Wt: A Web Toolkit". Dr. Dobb's Journal. Retrieved January 24, 2017.
  3. ^ Volkman, Victor (June 6, 2008). "Wt: C++ Web Toolkit Library Lets You Write Scripting-Independent Web Apps". QuinStreet. Retrieved January 24, 2017.

External links

Official website Edit this at Wikidata

This page was last edited on 23 February 2024, at 10:02
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