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OpenCart 2 Theme Development – Introduction


OpenCart  Themes are a bit Complicated due the directory creation and files management. Don’t get panic Because, this is fuzzy thing to make directories for your theme. Let’s See OpenCart 2 Theme Development. I Can’t See Proper Manual Or Tutorials to Develop Theme for Opencart 2.X  Developing a theme is not a single page article to read and develop accordingly.  We have more Amount of work in it.  Let’s start with Basic.

The Major Topic Can be listed below.

  1. Introduction & Folders/ Files Creation
  2. Admin Side Work
  3. Theme Work

Let’s Take a look at each items clearly.

OpenCart 2 Theme Development

1. Introduction

OpenCart has a lot of features in themes.  Also It runs under MVC-L .So we need to create 4 Files for each page. Than it work fine.  Most of the  time, you need MVC(Model, View, Controller) Files.  Language is Optional File. Opencart theme needs an activation from extensions Area. So you need to create an  Extension for your theme, There after enable the Extension to make your theme available to select it on OpenCart Site Settings. Let’s Take  brief look at the Extension  Creation and Files which are necessary to  create an  Extension. The Below Image describes you more about the files and directory for your Custom Theme Option.

opencart-2-theme-development-files-structure

You have to Create these three files under this directory Structure. Once you have created these files you are ready for next level of  Writing Code.

Note:

Here two php files and one tpl file, which is for the view page.  So Carefully make these files and also just remember, we dont need to create a file under model directory.  So Don’t get confuse with it. I have not omitted that, Actually, we don’t need this moment. We will see that in future customization and extended Features Area.

2. Admin Side Work

Let’s write Code to these new files,  I prefer to start with kvvaradha.php on the Controller File. Because, we need to create a class and extend the feature from it .

Controller/kvvaradha.php
<?php class ControllerExtensionThemekvvaradha extends Controller { private $error = array(); public function index() { $this->load->language('extension/theme/kvvaradha');

		$this->document->setTitle($this->language->get('heading_title'));

		$this->load->model('setting/setting');

		if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {
			$this->model_setting_setting->editSetting('kvvaradha', $this->request->post, $this->request->get['store_id']);

			$this->session->data['success'] = $this->language->get('text_success');

			$this->response->redirect($this->url->link('extension/extension', 'token=' . $this->session->data['token'] . '&type=theme', true));
		}

		$data['heading_title'] = $this->language->get('heading_title');

		$data['text_edit'] = $this->language->get('text_edit');
		$data['text_enabled'] = $this->language->get('text_enabled');
		$data['text_disabled'] = $this->language->get('text_disabled');
		$data['text_product'] = $this->language->get('text_product');
		$data['text_image'] = $this->language->get('text_image');
		$data['text_general'] = $this->language->get('text_general');
		
		$data['entry_directory'] = $this->language->get('entry_directory');
		$data['entry_status'] = $this->language->get('entry_status');		
		$data['entry_product_limit'] = $this->language->get('entry_product_limit');
		$data['entry_product_description_length'] = $this->language->get('entry_product_description_length');
		$data['entry_image_category'] = $this->language->get('entry_image_category');
		$data['entry_image_thumb'] = $this->language->get('entry_image_thumb');
		$data['entry_image_popup'] = $this->language->get('entry_image_popup');
		$data['entry_image_product'] = $this->language->get('entry_image_product');
		$data['entry_image_additional'] = $this->language->get('entry_image_additional');
		$data['entry_image_related'] = $this->language->get('entry_image_related');
		$data['entry_image_compare'] = $this->language->get('entry_image_compare');
		$data['entry_image_wishlist'] = $this->language->get('entry_image_wishlist');
		$data['entry_image_cart'] = $this->language->get('entry_image_cart');
		$data['entry_image_location'] = $this->language->get('entry_image_location');
		$data['entry_width'] = $this->language->get('entry_width');
		$data['entry_height'] = $this->language->get('entry_height');
		
		$data['help_product_limit'] = $this->language->get('help_product_limit');
		$data['help_product_description_length'] = $this->language->get('help_product_description_length');
		$data['help_directory'] = $this->language->get('help_directory');

		$data['button_save'] = $this->language->get('button_save');
		$data['button_cancel'] = $this->language->get('button_cancel');

		if (isset($this->error['warning'])) {
			$data['error_warning'] = $this->error['warning'];
		} else {
			$data['error_warning'] = '';
		}

		if (isset($this->error['product_limit'])) {
			$data['error_product_limit'] = $this->error['product_limit'];
		} else {
			$data['error_product_limit'] = '';
		}

		if (isset($this->error['product_description_length'])) {
			$data['error_product_description_length'] = $this->error['product_description_length'];
		} else {
			$data['error_product_description_length'] = '';
		}

		if (isset($this->error['image_category'])) {
			$data['error_image_category'] = $this->error['image_category'];
		} else {
			$data['error_image_category'] = '';
		}

		if (isset($this->error['image_thumb'])) {
			$data['error_image_thumb'] = $this->error['image_thumb'];
		} else {
			$data['error_image_thumb'] = '';
		}

		if (isset($this->error['image_popup'])) {
			$data['error_image_popup'] = $this->error['image_popup'];
		} else {
			$data['error_image_popup'] = '';
		}

		if (isset($this->error['image_product'])) {
			$data['error_image_product'] = $this->error['image_product'];
		} else {
			$data['error_image_product'] = '';
		}

		if (isset($this->error['image_additional'])) {
			$data['error_image_additional'] = $this->error['image_additional'];
		} else {
			$data['error_image_additional'] = '';
		}

		if (isset($this->error['image_related'])) {
			$data['error_image_related'] = $this->error['image_related'];
		} else {
			$data['error_image_related'] = '';
		}

		if (isset($this->error['image_compare'])) {
			$data['error_image_compare'] = $this->error['image_compare'];
		} else {
			$data['error_image_compare'] = '';
		}

		if (isset($this->error['image_wishlist'])) {
			$data['error_image_wishlist'] = $this->error['image_wishlist'];
		} else {
			$data['error_image_wishlist'] = '';
		}

		if (isset($this->error['image_cart'])) {
			$data['error_image_cart'] = $this->error['image_cart'];
		} else {
			$data['error_image_cart'] = '';
		}

		if (isset($this->error['image_location'])) {
			$data['error_image_location'] = $this->error['image_location'];
		} else {
			$data['error_image_location'] = '';
		}
		
		$data['breadcrumbs'] = array();

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('text_home'),
			'href' => $this->url->link('common/dashboard', 'token=' . $this->session->data['token'], true)
		);

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('text_extension'),
			'href' => $this->url->link('extension/extension', 'token=' . $this->session->data['token'] . '&type=theme', true)
		);

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('heading_title'),
			'href' => $this->url->link('extension/theme/kvvaradha', 'token=' . $this->session->data['token'] . '&store_id=' . $this->request->get['store_id'], true)
		);

		$data['action'] = $this->url->link('extension/theme/kvvaradha', 'token=' . $this->session->data['token'] . '&store_id=' . $this->request->get['store_id'], true);

		$data['cancel'] = $this->url->link('extension/extension', 'token=' . $this->session->data['token'] . '&type=theme', true);

		if (isset($this->request->get['store_id']) && ($this->request->server['REQUEST_METHOD'] != 'POST')) {
			$setting_info = $this->model_setting_setting->getSetting('kvvaradha', $this->request->get['store_id']);
		}
		
		if (isset($this->request->post['kvvaradha_directory'])) {
			$data['kvvaradha_directory'] = $this->request->post['kvvaradha_directory'];
		} elseif (isset($setting_info['kvvaradha_directory'])) {
			$data['kvvaradha_directory'] = $setting_info['kvvaradha_directory'];
		} else {
			$data['kvvaradha_directory'] = 'kvvaradha';
		}		

		$data['directories'] = array();

		$directories = glob(DIR_CATALOG . 'view/theme/*', GLOB_ONLYDIR);

		foreach ($directories as $directory) {
			$data['directories'][] = basename($directory);
		}

		if (isset($this->request->post['kvvaradha_product_limit'])) {
			$data['kvvaradha_product_limit'] = $this->request->post['kvvaradha_product_limit'];
		} elseif (isset($setting_info['kvvaradha_product_limit'])) {
			$data['kvvaradha_product_limit'] = $setting_info['kvvaradha_product_limit'];
		} else {
			$data['kvvaradha_product_limit'] = 15;
		}		
		
		if (isset($this->request->post['kvvaradha_status'])) {
			$data['kvvaradha_status'] = $this->request->post['kvvaradha_status'];
		} elseif (isset($setting_info['kvvaradha_status'])) {
			$data['kvvaradha_status'] = $this->config->get('kvvaradha_status');
		} else {
			$data['kvvaradha_status'] = '';
		}
		
		if (isset($this->request->post['kvvaradha_product_description_length'])) {
			$data['kvvaradha_product_description_length'] = $this->request->post['kvvaradha_product_description_length'];
		} elseif (isset($setting_info['kvvaradha_product_description_length'])) {
			$data['kvvaradha_product_description_length'] = $this->config->get('kvvaradha_product_description_length');
		} else {
			$data['kvvaradha_product_description_length'] = 100;
		}
		
		if (isset($this->request->post['kvvaradha_image_category_width'])) {
			$data['kvvaradha_image_category_width'] = $this->request->post['kvvaradha_image_category_width'];
		} elseif (isset($setting_info['kvvaradha_image_category_width'])) {
			$data['kvvaradha_image_category_width'] = $this->config->get('kvvaradha_image_category_width');
		} else {
			$data['kvvaradha_image_category_width'] = 80;		
		}
		
		if (isset($this->request->post['kvvaradha_image_category_height'])) {
			$data['kvvaradha_image_category_height'] = $this->request->post['kvvaradha_image_category_height'];
		} elseif (isset($setting_info['kvvaradha_image_category_height'])) {
			$data['kvvaradha_image_category_height'] = $this->config->get('kvvaradha_image_category_height');
		} else {
			$data['kvvaradha_image_category_height'] = 80;
		}
		
		if (isset($this->request->post['kvvaradha_image_thumb_width'])) {
			$data['kvvaradha_image_thumb_width'] = $this->request->post['kvvaradha_image_thumb_width'];
		} elseif (isset($setting_info['kvvaradha_image_thumb_width'])) {
			$data['kvvaradha_image_thumb_width'] = $this->config->get('kvvaradha_image_thumb_width');
		} else {
			$data['kvvaradha_image_thumb_width'] = 228;
		}
		
		if (isset($this->request->post['kvvaradha_image_thumb_height'])) {
			$data['kvvaradha_image_thumb_height'] = $this->request->post['kvvaradha_image_thumb_height'];
		} elseif (isset($setting_info['kvvaradha_image_thumb_height'])) {
			$data['kvvaradha_image_thumb_height'] = $this->config->get('kvvaradha_image_thumb_height');
		} else {
			$data['kvvaradha_image_thumb_height'] = 228;		
		}
		
		if (isset($this->request->post['kvvaradha_image_popup_width'])) {
			$data['kvvaradha_image_popup_width'] = $this->request->post['kvvaradha_image_popup_width'];
		} elseif (isset($setting_info['kvvaradha_image_popup_width'])) {
			$data['kvvaradha_image_popup_width'] = $this->config->get('kvvaradha_image_popup_width');
		} else {
			$data['kvvaradha_image_popup_width'] = 500;
		}
		
		if (isset($this->request->post['kvvaradha_image_popup_height'])) {
			$data['kvvaradha_image_popup_height'] = $this->request->post['kvvaradha_image_popup_height'];
		} elseif (isset($setting_info['kvvaradha_image_popup_height'])) {
			$data['kvvaradha_image_popup_height'] = $this->config->get('kvvaradha_image_popup_height');
		} else {
			$data['kvvaradha_image_popup_height'] = 500;
		}
		
		if (isset($this->request->post['kvvaradha_image_product_width'])) {
			$data['kvvaradha_image_product_width'] = $this->request->post['kvvaradha_image_product_width'];
		} elseif (isset($setting_info['kvvaradha_image_product_width'])) {
			$data['kvvaradha_image_product_width'] = $this->config->get('kvvaradha_image_product_width');
		} else {
			$data['kvvaradha_image_product_width'] = 228;
		}
		
		if (isset($this->request->post['kvvaradha_image_product_height'])) {
			$data['kvvaradha_image_product_height'] = $this->request->post['kvvaradha_image_product_height'];
		} elseif (isset($setting_info['kvvaradha_image_product_height'])) {
			$data['kvvaradha_image_product_height'] = $this->config->get('kvvaradha_image_product_height');
		} else {
			$data['kvvaradha_image_product_height'] = 228;
		}
		
		if (isset($this->request->post['kvvaradha_image_additional_width'])) {
			$data['kvvaradha_image_additional_width'] = $this->request->post['kvvaradha_image_additional_width'];
		} elseif (isset($setting_info['kvvaradha_image_additional_width'])) {
			$data['kvvaradha_image_additional_width'] = $this->config->get('kvvaradha_image_additional_width');
		} else {
			$data['kvvaradha_image_additional_width'] = 74;
		}
		
		if (isset($this->request->post['kvvaradha_image_additional_height'])) {
			$data['kvvaradha_image_additional_height'] = $this->request->post['kvvaradha_image_additional_height'];
		} elseif (isset($setting_info['kvvaradha_image_additional_height'])) {
			$data['kvvaradha_image_additional_height'] = $this->config->get('kvvaradha_image_additional_height');
		} else {
			$data['kvvaradha_image_additional_height'] = 74;
		}
		
		if (isset($this->request->post['kvvaradha_image_related_width'])) {
			$data['kvvaradha_image_related_width'] = $this->request->post['kvvaradha_image_related_width'];
		} elseif (isset($setting_info['kvvaradha_image_related_width'])) {
			$data['kvvaradha_image_related_width'] = $this->config->get('kvvaradha_image_related_width');
		} else {
			$data['kvvaradha_image_related_width'] = 80;
		}
		
		if (isset($this->request->post['kvvaradha_image_related_height'])) {
			$data['kvvaradha_image_related_height'] = $this->request->post['kvvaradha_image_related_height'];
		} elseif (isset($setting_info['kvvaradha_image_related_height'])) {
			$data['kvvaradha_image_related_height'] = $this->config->get('kvvaradha_image_related_height');
		} else {
			$data['kvvaradha_image_related_height'] = 80;
		}
		
		if (isset($this->request->post['kvvaradha_image_compare_width'])) {
			$data['kvvaradha_image_compare_width'] = $this->request->post['kvvaradha_image_compare_width'];
		} elseif (isset($setting_info['kvvaradha_image_compare_width'])) {
			$data['kvvaradha_image_compare_width'] = $this->config->get('kvvaradha_image_compare_width');
		} else {
			$data['kvvaradha_image_compare_width'] = 90;
		}
		
		if (isset($this->request->post['kvvaradha_image_compare_height'])) {
			$data['kvvaradha_image_compare_height'] = $this->request->post['kvvaradha_image_compare_height'];
		} elseif (isset($setting_info['kvvaradha_image_compare_height'])) {
			$data['kvvaradha_image_compare_height'] = $this->config->get('kvvaradha_image_compare_height');
		} else {
			$data['kvvaradha_image_compare_height'] = 90;
		}
		
		if (isset($this->request->post['kvvaradha_image_wishlist_width'])) {
			$data['kvvaradha_image_wishlist_width'] = $this->request->post['kvvaradha_image_wishlist_width'];
		} elseif (isset($setting_info['kvvaradha_image_wishlist_width'])) {
			$data['kvvaradha_image_wishlist_width'] = $this->config->get('kvvaradha_image_wishlist_width');
		} else {
			$data['kvvaradha_image_wishlist_width'] = 47;
		}
		
		if (isset($this->request->post['kvvaradha_image_wishlist_height'])) {
			$data['kvvaradha_image_wishlist_height'] = $this->request->post['kvvaradha_image_wishlist_height'];
		} elseif (isset($setting_info['kvvaradha_image_wishlist_height'])) {
			$data['kvvaradha_image_wishlist_height'] = $this->config->get('kvvaradha_image_wishlist_height');
		} else {
			$data['kvvaradha_image_wishlist_height'] = 47;
		}
		
		if (isset($this->request->post['kvvaradha_image_cart_width'])) {
			$data['kvvaradha_image_cart_width'] = $this->request->post['kvvaradha_image_cart_width'];
		} elseif (isset($setting_info['kvvaradha_image_cart_width'])) {
			$data['kvvaradha_image_cart_width'] = $this->config->get('kvvaradha_image_cart_width');
		} else {
			$data['kvvaradha_image_cart_width'] = 47;
		}
		
		if (isset($this->request->post['kvvaradha_image_cart_height'])) {
			$data['kvvaradha_image_cart_height'] = $this->request->post['kvvaradha_image_cart_height'];
		} elseif (isset($setting_info['kvvaradha_image_cart_height'])) {
			$data['kvvaradha_image_cart_height'] = $this->config->get('kvvaradha_image_cart_height');
		} else {
			$data['kvvaradha_image_cart_height'] = 47;
		}
		
		if (isset($this->request->post['kvvaradha_image_location_width'])) {
			$data['kvvaradha_image_location_width'] = $this->request->post['kvvaradha_image_location_width'];
		} elseif (isset($setting_info['kvvaradha_image_location_width'])) {
			$data['kvvaradha_image_location_width'] = $this->config->get('kvvaradha_image_location_width');
		} else {
			$data['kvvaradha_image_location_width'] = 268;
		}
		
		if (isset($this->request->post['kvvaradha_image_location_height'])) {
			$data['kvvaradha_image_location_height'] = $this->request->post['kvvaradha_image_location_height'];
		} elseif (isset($setting_info['kvvaradha_image_location_height'])) {
			$data['kvvaradha_image_location_height'] = $this->config->get('kvvaradha_image_location_height');
		} else {
			$data['kvvaradha_image_location_height'] = 50;
		}
		
		$data['header'] = $this->load->controller('common/header');
		$data['column_left'] = $this->load->controller('common/column_left');
		$data['footer'] = $this->load->controller('common/footer');

		$this->response->setOutput($this->load->view('extension/theme/kvvaradha', $data));
	}	

	protected function validate() {
		if (!$this->user->hasPermission('modify', 'extension/theme/kvvaradha')) {
			$this->error['warning'] = $this->language->get('error_permission');
		}

		if (!$this->request->post['kvvaradha_product_limit']) {
			$this->error['product_limit'] = $this->language->get('error_limit');
		}

		if (!$this->request->post['kvvaradha_product_description_length']) {
			$this->error['product_description_length'] = $this->language->get('error_limit');
		}

		if (!$this->request->post['kvvaradha_image_category_width'] || !$this->request->post['kvvaradha_image_category_height']) {
			$this->error['image_category'] = $this->language->get('error_image_category');
		}

		if (!$this->request->post['kvvaradha_image_thumb_width'] || !$this->request->post['kvvaradha_image_thumb_height']) {
			$this->error['image_thumb'] = $this->language->get('error_image_thumb');
		}

		if (!$this->request->post['kvvaradha_image_popup_width'] || !$this->request->post['kvvaradha_image_popup_height']) {
			$this->error['image_popup'] = $this->language->get('error_image_popup');
		}

		if (!$this->request->post['kvvaradha_image_product_width'] || !$this->request->post['kvvaradha_image_product_height']) {
			$this->error['image_product'] = $this->language->get('error_image_product');
		}

		if (!$this->request->post['kvvaradha_image_additional_width'] || !$this->request->post['kvvaradha_image_additional_height']) {
			$this->error['image_additional'] = $this->language->get('error_image_additional');
		}

		if (!$this->request->post['kvvaradha_image_related_width'] || !$this->request->post['kvvaradha_image_related_height']) {
			$this->error['image_related'] = $this->language->get('error_image_related');
		}

		if (!$this->request->post['kvvaradha_image_compare_width'] || !$this->request->post['kvvaradha_image_compare_height']) {
			$this->error['image_compare'] = $this->language->get('error_image_compare');
		}

		if (!$this->request->post['kvvaradha_image_wishlist_width'] || !$this->request->post['kvvaradha_image_wishlist_height']) {
			$this->error['image_wishlist'] = $this->language->get('error_image_wishlist');
		}

		if (!$this->request->post['kvvaradha_image_cart_width'] || !$this->request->post['kvvaradha_image_cart_height']) {
			$this->error['image_cart'] = $this->language->get('error_image_cart');
		}

		if (!$this->request->post['kvvaradha_image_location_width'] || !$this->request->post['kvvaradha_image_location_height']) {
			$this->error['image_location'] = $this->language->get('error_image_location');
		}

		return !$this->error;
	}
}

Don’t Feel like this is a complicated code. Just copy and use it.

Language/kvvaradha.php

Next will be the language area, Here I Just coded it for English-gb the Default one. You can check here in  Next Page.

commenter

About Varadharaj V

The founder of Kvcodes, Varadharaj V is an ERP Analyst and a Web developer specializing in WordPress(WP), WP Theme development, WP Plugin development, Frontaccounting(FA), Sales, Purchases, Inventory, Ledgers, Payroll & HRM, CRM, FA Core Customization, OpenCart Theme Development, PHP, HTML, CSS, jQuery, Bootstrap development and content SEO.

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