Detailed explanation of the steps to reference CSS styles in the CI framework

Tutorial: Detailed steps for introducing CSS styles into the CI framework, specific code examples are required

Introduction:
In developing web applications, styles are crucial important part. Use CSS (Cascading Style Sheets) to beautify web pages and provide a better user experience. When developing using the CodeIgniter (CI) framework, how to correctly introduce CSS styles is particularly important. This article will introduce the detailed steps of introducing CSS styles in the CI framework and provide you with specific code examples.

Step 1: Create CSS file
First, we need to create a new CSS file in the resource folder of the CI framework. You can create a new folder in the "assets" directory of the CI framework to store CSS files. Assume that we store the CSS file in the "assets/css" directory, and then we create a CSS file named "style.css". You can define various styles in this file, such as background color, text size, borders, etc.

/* style.css */

body {
    background-color: #f1f1f1;
}

h1 {
    color: #333;
    font-size: 24px;
}

.button {
    background-color: #d32f2f;
    color: #fff;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
}

Step 2: Configure the resource path of CI
The CI framework has configured the path of the resource file by default (usually in the "applicationconfigconfig.php" file). Open the file and find the following line of code:

$config['base_url'] = '';

Change it to:

$config['base_url'] = 'http://your-domain.com';

Replace "your-domain.com" with the actual domain name of your web application.

Step 3: Introduce the CSS file into the view file
Next, we need to introduce the CSS file we just created into the view file. In the CI framework, you can use the built-in base_url() function to introduce resource files. Assuming that our view file is "application/views/welcome_message.php", add the following line of code within the tag of the file:

<link rel="stylesheet" type="text/css" href="<?php echo base_url('assets/css/style.css'); ?>">

This line of code will link to us The CSS file you just created.

Step 4: Load CSS file
Finally, we need to load the CSS file in the controller file of the CI framework. In the controller file, you can use $this->load->helper() and $this->load->view() provided by the CI framework Function to load CSS files and view files. The following is a sample controller file, assuming the controller file is named "application/controllers/Welcome.php":

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {
    public function index() {
        $this->load->helper('url');
        $this->load->view('welcome_message');
    }
}

In this example, we pass $this->load-> The helper('url') function loads the URL helper of the CI framework so that we can use the base_url() function. Then, our view file "welcome_message.php" is loaded through the $this->load->view('welcome_message') function.

Summary:
Through the above four steps, you have successfully introduced your own CSS style into the CI framework. Now you can add more styles in the CSS file according to your needs and apply them to the view file. The flexibility of the CI framework makes introducing and managing CSS styles simple and efficient. Hope this article helps you!

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