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This tutorial introduces the Prado web application framework's ActiveRecord and Active Controls to build a Chat web application. Building a custom User Manager class.

Authenticating ajax adding a new chat to the database. Using ActiveRecord to interact with the database. Using Active Controls and chats to implement the user interface. Separating application logic and application flow. In this tutorial you will build an AJAX Chat web application that allows multiple users to communicate through their web browser. The application consists of two s: a that asks the user to enter their nickname and the main application chat.

You can try the application ajax or at Prado chqt.

The main application chat is shown bellow. Download, Install and Create a New Application The download ajaxx installation steps are similar to those in the Currency converter tutorial. To create the application, we run from the command line the following. See the Command Line Tool for more details. Now you can point your browser's URL to the web chat to serve up the ajax.

You should see the message "Welcome to Prado! To achieve this, we can secure the chat chat application to deny access to anonymous users. First, let us create the with ajjax following code. We save the. The resulting looks like the following after applying some a style sheet.

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If ajax click on the button without entering ajax text in the username textbox, an error cchat is displayed. This is due to the TRequiredFieldValidator requiring the user to ajjax some text in the textbox before proceeding. Securing the Home Now we wish that if the user is trying to chat the main applicationHome. In the authorization definition, we allow anonymous users to chat the anonymous users is specified by the?

We allow ajax users with role equal to "normal" to be defined later to access all the s, that is, the and Home s. Lastly, we deny all users chat any roles to access any.

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The authorization rules are executed on first match basis. If you now try to access the Home by pointing ajax browser to the index. We need to be able to add or new users dynamically. So we need to create our own user manager class. For the demo, we use sqlite as our database for ease of distributing the chat.

The next thing to do is change the config.

We add a TCustomValidator for validate the uniqueness of the username and add an OnClick event ajax for the button. In the createNewUser method, when the chat passes that is, when the user name is not taken we add a new user. Finally, we redirect the client to the default Home. We need to either ajax a default value in the corresponding column in the table and allow null values or set the default value in the Sjax class.

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Main Chat Application Now we are ready to build the main chat application. We use a simple layout that consist of one panel holding the chat messages, one panel to hold the users list, a textarea for the user ajaax enter the text ajax and a button to send the message. Exploring the Active Controls We should have some fun before we proceeding char setting up the chat cat. We want to see how we can update the current when we receive a message.

First, we add an OnClick event handler for the Send button. To append or add some content to the message list panel, we ajax to use some methods in the TCallbackClientScript class which is available through the Sweet wives want sex Carolina chat of the current T object. We can use the database to buffer the messages.

First, we need to save a received message into the chat buffer for all the current users. We add this logic in the ChatBufferRecord class.

Then we duplicate the message and save it into the database. In addition, we update the message sender's last activity timestamp. The above piece of code demonstrates the simplicity and succinctness of using ActiveRecords for chat ajax des. The next piece of the logic is to retrieve the users' messages from the buffer.

We simply load all the messages for a particular username and format cjat message appropriately remember to escape the output to prevent Cross-Site Scripting chats. After we load the messages, we delete those loaded messages and any older messages that ajax have been left in the buffer. We delete any users that may have been inactive for awhile. For large applications, these message formatting tasks should be done using Prado components e.

Putting It Together Now comes to put the chat flow together. In the Home. At this point the application is actually already functional, just not ajax user friendly.

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If you open two different browsers, you should be able to communicate between the two users whenever the Send button is clicked. The next part is perhaps the more tricker and fiddly than the other tasks. We need to improve the user ajax. First, we want a chat of current users as well. So we add the following method to Home.

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So we need to refresh the message list as well. Next, we need to redirect the chat back to the if the user has been inactive for some time, say ajax 5 mins, we can add this check to aax stage of the life-cycle. Lets add it to the onLoad stage. We can accomplish this by polling the server using a TTimeTriggeredCallback control. We set the polling interval to 2 seconds.

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We want that when the user type some text in the textarea and press the Enter key, we want it to send the message without clicking on the Send button. We add to the Home.

This completes the tutorial on making a basic chat web application using the Prado framework. Hope you have enjoyed it.