Would you like to know how OpenCart Layouts and positions actually work? Keep reading.
OpenCart layouts is a dynamic way of displaying extensions on OpenCart Frontend. It is a very flexible feature and a cornerstone of OpenCart CMS, yet, many users have little understanding of the way it works.
Every page you open on OpenCart store is attached to a layout. Every layout defines 4 possible positions, where you can place a module. This means you can place a module "Categories" only on the Category layout in the position "left column"
OpenCart has 2 types of pages:
The Difference between static and dynamic pages is that you can generate an unlimited amount of dynamic pages and edit the content of dynamic pages via the admin panel. You can also define a custom layout for a dynamic page via the admin panel.
Before diving into layouts, we first need to learn about positions.
OpenCart allows users to display modules in 4 hardcoded positions: Content top, Content bottom, Column left and Column right.
There are third-party extensions that will allow you to extend the number of positions like Extra Positions Unlimited
You can only place Extensions type Modules into these positions.
So now you know what are OpenCart layouts and positions, but how do they actually work.
Since OpenCart is an MVC pattern framework, there is a
controller file for every position. You can find these files in folder
catalog/controller/common. Each position controller file does the following:
This is roughly the idea behind OpenCart layouts and positions. If there where no layouts, you would see the same extensions on all positions. For instance, WordPress does not have dynamic layouts and when you place a widget into a position, it displays on all pages. To solve this, WordPress allows developers to create separate files for a post or a page and simply remove or add the code for relevant positions.
Would you like to know exactly how OpenCart layout code works? Really? Well, here it is.
line 14 through 32we compare the route parameter to define one of three dynamic pages.
line 34the route parameter is used to find a connected layout for that static page.
line 38the code falls back to the default layout, which is defined in
system/settingsof the store. (usually is "Default")
line 46and is eventually displayed on the frontend.
Wow, congratulations! You got all the way to the end. You must really want to learn OpenCart. You liked this tutorial, check out our Youtube channel and keep growing your OpenCart knowledge.