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In Express.js, by default, the view engine is set to use a template engine such as EJS, Handlebars, Pug (formerly Jade), etc.

However, if you want to use plain HTML files as your views without any template engine, you can do so by configuring Express to use the html file extension and serve static HTML files.

Here’s how you can set up Express to serve static HTML files as views:

1. Install Express

If you haven’t already installed Express in your project, you can do so using npm:

npm install express

2. Set up your Express app

Create your Express app and configure it to serve static HTML files from a directory.

const express = require("express");
const app = express();

// Set the directory from which to serve static HTML files
app.use(express.static("public"));

// Set the view engine to use HTML files
app.set("view engine", "html");

// Set the directory where your HTML files are stored
app.set("views", __dirname + "/views");

// Define your routes
app.get("/", (req, res) => {
  // Render the 'index.html' file
  res.render("index");
});

// Start the server
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

3. Create your HTML files

Create HTML files in a directory specified in the views directory.

For example, if you set app.set('views', __dirname + '/views');, create an index.html file in the views directory.

4. Accessing HTML files

Your HTML files will be served as views when you access the routes defined in your Express app.

For example, accessing the root route (/) will render the index.html file.

Your directory structure might look like this:

project
│   app.js
└───views
    │   index.html

In this setup, Express will serve static HTML files from the views directory without any additional processing. You can use plain HTML, CSS, and JavaScript in your HTML files as needed.

To stop CKEditor from automatically stripping classes from <div> elements, you can configure CKEditor to allow certain HTML tags and attributes, including classes.

This can be achieved by configuring the CKEditor instance to use a specific set of allowed content rules.

For example, we write:

// Assuming you have already initialized CKEditor
var editor = CKEDITOR.replace('editor', {
    // Define the allowed content rules
    // Here we allow <div> elements with any class attribute
    // You can customize this as needed
    extraAllowedContent: 'div(*){*};',
    // Disable content filtering
    // Note: Disabling content filtering may pose security risks, 
    // so use it carefully and consider implementing server-side filtering
    // or other security measures
    allowedContent: true
});

In this example, extraAllowedContent allows you to specify additional elements and attributes that CKEditor should allow.

In this case, we’re allowing <div> elements with any class attribute.

allowedContent is set to true to disable content filtering completely.

Be cautious when using this option, as it can potentially allow malicious content to be injected into the editor.

Make sure to adjust the extraAllowedContent option according to your specific needs and security considerations.

In JavaScript, you can create a new line in a string using the newline character \n. When you include \n in a string, it signifies a line break.

For example, we write:

var multiLineString = "This is line 1.\nThis is line 2.";
console.log(multiLineString);

This will output:

This is line 1.
This is line 2.

You can use the newline character \n within strings in various contexts, such as in console.log() outputs, in HTML elements (for example, setting the innerText or innerHTML properties), or when constructing strings dynamically.

To pass variables to a Handlebars partial in JavaScript, you typically need to register the partial with Handlebars and then use it in your templates while passing the variables as parameters.

To do this, we do the following steps:

1. Register the partial with Handlebars:

Define your partial and register it with Handlebars using Handlebars.registerPartial().

2. Pass variables to the partial:

When you include the partial in your main template, pass the variables as parameters.

Here’s an example:

HTML:

<!-- index.html -->
<!DOCTYPE html>
<html>
<head>
    <title>Handlebars Partial Example</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.7.7/handlebars.min.js"></script>
</head>
<body>
    <div id="container"></div>

    <script id="main-template" type="text/x-handlebars-template">
        <h1>Main Template</h1>
        {{> myPartial firstName lastName}}
    </script>

    <script>
        // Step 1: Register the partial with Handlebars
        Handlebars.registerPartial('myPartial', '{{firstName}} {{lastName}}');

        // Step 2: Compile the main template
        var source = document.getElementById('main-template').innerHTML;
        var template = Handlebars.compile(source);

        // Step 3: Render the template with data
        var data = { firstName: 'John', lastName: 'Doe' };
        var html = template(data);

        // Step 4: Display the rendered HTML
        document.getElementById('container').innerHTML = html;
    </script>
</body>
</html>

In this example, we define a main template containing a Handlebars partial {{> myPartial firstName lastName}}.

We register the partial with Handlebars using Handlebars.registerPartial().

Next we compile the main template using Handlebars.compile() and render it with the provided data.

Then we pass firstName and lastName as parameters to the partial when including it in the main template.

Adjust the variable names, partial content, and template structure as needed for your specific use case.