There’s a reason for the challenge. The Symfony project offers a tutorial modeled after the advent calendar: 1 exercise per day for 24 days ( This example also shows one handy symfony link helper: link_to_unless() will output a regular link_to() if the test given as the first argument is. A lot of developers learned symfony thanks to askeet, and many companies still use askeet as their main training material. But the askeet tutorial started to show.
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After seven hours of work, the askeet application has advanced well. The home page displays a list of questions, the detail of a question shows its answers, users have a profile page, and thematic lists are available from every page in the sidebar. Our community-enhanced FAQ is in the right direction see the list of actions available as of yesterdayand yet the users cannot alter the data for now.
If the base of data manipulation in the web has long been forms, today the AJAX techniques and usability enhancements can change the way an application is built. And that applies to askeet, too. This tutorial will show you how to add AJAX-enhanced interactions to askeet.
The objective is to allow a registered user to declare its interest about a question. While an asynchronous request is pending, users of an AJAX-powered website don’t have any of the usual clues that their action was taken into account and that the result will soon be displayed. That’s why every page containing AJAX interactions should be able to display an activity indicator. It is empty, but the main.
An ajax interaction is made up of three parts: Let’s go back to the questions displayed. If you remember the day foura question can be displayed in the lists of questions and in the detail of a question. Open this fragment again, add a link to allow users to declare their interest:.
The askert zone is the part between the two comments. tutofial
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The action, once executed, will replace this content. This action must create a new record in the Interest table for the current question titorial the current user. Here is how to do it with symfony:. So the number of interested users about the current question will be magically incremented on screen after the call of the action. That’s the greatest interest of having written this fragment in the first place.
The development of the AJAX interest is now over. The indicator appears while the request is passed to the server. Then, the number is incremented in a highlight when turorial server answers.
Note that the initial ‘interested?
If you want more examples about the use of the AJAX helpers, you can read the drag-and-drop shopping cart tutorialwatch the associated screencast or read the related book chapter. We previously said that only registered users could declare interest about a question. This means that if a non-authenticated user clicks on an ‘interested? A better idea would be to have a login form appear dynamically on the page. That’s what we are going to do. Once again, this form is hidden by default.
The referer hidden tag contains the referer request parameter if it exists, or else the current URI. Do you remember the User helper that we wrote previously?
Jobeet: The new symfony advent calendar
We will now deal with the case where the user is not authenticated. When the user is not authenticated, the link on the ‘interested?
Do we have to modify it again?
Test the Tutodial functionality now. An unregistered user will be presented a login form without leaving the current page. If the nickname and the password are recognized, the page will be refreshed and the user will be able to click on the ‘interested? That’s tutoeial an initial result is often displayed when the whole page is first loaded, and because the part that is updated by the AJAX action is also part of the initial template.
The most difficult thing in designing AJAX interactions is to properly define the caller, the server action, and the result zone. Once you know them, symfony gives you the helpers that do the rest. To be sure that you understood how it works, check out how we implement the same mechanism for adding answers in chapter The User module also gains a vote action and a voteSuccess.
Don’t forget to set the layout to off for this template too.
Askeet is starting to look like a web 2. And it is just the beginning: In a few days, we will add some more AJAX interactions to it. Tomorrow we will take the occasion to do a general review of the MVC techniques in symfony, tuttorial to implement an external library. If you don’t have any problems, come to the askeet forum to answer the other’s questions.
You are browsing the legacy 1. This version of symfony is not maintained tuttorial. If some of your projects still use this version, consider upgrading. Previously on symfony After seven hours of work, the askeet application has advanced well.
Add an indicator in the layout While an asynchronous request is pending, users of an AJAX-powered website don’t have any of the usual clues askfet their action was taken into account and that the result will soon be displayed.
Caller Let’s go back to the questions displayed. Open this fragment again, add a link to allow users to declare their interest: