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Trying To Code Very Simple Addon - And I Need Your Help!

Discussion in 'XenForo Development Discussions' started by TheBigK, Nov 20, 2014.

  1. TheBigK

    TheBigK Well-Known Member

    After spending several days reading tutorials; I've decided to take my own baby steps in coding addons, so that I understand how the entire system works. However, it looks like I'm stuck at the very first step itself!

    I've decided to code an addon that will -
    1. Have its own location: localhost/xf/adder/
    2. This page will show two small input boxes to accept two numbers viz: [ No#1 ] + [ No #2 ] = (Calculate)
    3. User will enter two numbers and press (Calculate) button.
    4. The addon will calculate the result and store the result in the thread ID , which is specified in the admin option.
    5. So the add-on will create a thread which stores the results; each new calculated result as a new post in the thread.
    Here's my thought process & prep-work so far:-

    1. Created a new Addon in AdminCP, as 'Adder'
    2. Created a new folder named 'Adder' in the /xf/library/
    3. Installation/Uninstallation Class::Method - Not provided (I'm going to need it to create the tables in DB).
    ...and I'm staring for the past 20 minutes at the folder 'Adder' :D.


    I'm thinking I need to do this:-
    1. Create a Route Prefix called 'adder' - because I need to build path http://localhost/xf/adder/
    2. I need to create a template that will create input form & buttons on the path. [I am guessing that this is the 'VIEW' part of the MVC thingy]
    3. Write a MODEL that adds the numbers entered by the user and store the result in Database. I will need to create a DataWriter for this.
    Step # 1 - Creating The Route Prefix

    I went to AdminCP -> Development -> Navigation -> Route Prefixes -> Create New Route Prefix

    Route Prefix: adder
    Route Type: Public
    Route Class: HUMM -> Gotta Write This Myself
    Use Class To Build Link: Always
    Addon : Adder

    Now created -> Adder/Route/Prefix/Index.php with following code:-
    class Adder_Route_Prefix_Index implements XenForo_Route_Interface
    Looking for the angels here to give me a push in the right direction.
  2. Chris D

    Chris D XenForo Developer Staff Member

    Does XenForo use any route classes anywhere for anything?

    How does it do them?
  3. TheBigK

    TheBigK Well-Known Member

    Yes! So I referred to Kier's scratchPad addon (tutorial) and found this -

    public function match($routePath, Zend_Controller_Request_Http $request, XenForo_Router $router)
            return $router->getRouteMatch('Scratchpad_ControllerPublic_Index', $routePath);
    In my case, (I guess) it'd be -

    return $router->getRouteMatch('Adder_ControllerPublic_Index',  $routePath);
    But why do I need this 'Adder_ControllerPublic_Index' ? What's it going to do?

    PS: I hope this is in the right direction.
  4. Chris D

    Chris D XenForo Developer Staff Member


    What does it do for the Scratchpad add-on?
    TheBigK likes this.
  5. Jim Boy

    Jim Boy Well-Known Member

    The Adder_ControllerPublic_Index puts the C into MVC and basically dictates what you want to do.

    So for example create a file called Adder/ControllerPublic/Index.php that should be roughly like:
    class Adder_ControllerPublic_Index  extends XenForo_ControllerPublic_Abstract
      protected function _preDispatch($action)
      public function actionIndex()
      $adderModel->processSomeStuff($somedata); //(processing stuff)
      return $this->responseView('Adder_ViewPublic_Whatever', 'Adder_whatever', $viewParams);//(preparing view)
    Best thing to do is to see what other addons are doing
  6. TheBigK

    TheBigK Well-Known Member

    I spent quite some time trying to understand how the scratchpad addon is doing it. I found out that the 'Scratchpad_ControllerPublic_Index' has a set of actions :

    actionIndex() -> Seems to bring options from AdminCP and do other preparatory work like getting latest notes, dates
    actionPostNote() -> Creates a DataWriter and interacts with database to post the notes text to the Database. It also returns a 'view' (this is bit confusing).

    Basically, it seems to be doing the real backend job for the addon.
    My addon needs to fetch only one option from admincp. So I created this AdminCP Option -

    Screen Shot 2014-11-20 at 6.13.04 pm.png

    PS: Not sure about Validation Callback and Format Parameters. Do I need to fill anything into those fields?

    I then created Adder/ControllerPublic/Index.php ->

    class Adder_ControllerPublic_Index extends XenForo_ControllerPublic_Abstract
        public function 
    //Get The Thread ID From Admin Options
    $threadNum XenForo_Application::get('options')->threadnumber;
        public function 
    // What all activities should this function do?

    I'm stuck at this file. Do I need a separate MODEL like in scratchpad addon or perform addition in this file itself? Also, what all methods should I create inside the Adder_ControllerPublic_Index class?
  7. TheBigK

    TheBigK Well-Known Member

    Progress Update:

    I went ahead and built the installer for the addon. I now have a database table that stores everything: number 1, number 2, result, and calculation ID. I don't know whether I'll need calculation ID as an index; but I've decided to define it anyway.

    I also updated the addon-settings to reflect my new installation class::method.

    I however couldn't figure out the Controller and Model thingy for this addon. Too many jumbled up thoughts in my head about the controller. :confused:
  8. xfrocks

    xfrocks Well-Known Member

    Your controller should do two things:
    • Render a view with form, inputs and button
    • Get inputs (number one and number two) from user submitted form
    For your simple task, you don't need a model IMHO.
    TheBigK likes this.

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