Introduction to Hogan.js

Hogan.js is a robust templating engine based on Mustache, making it easy to dynamically generate HTML content in JavaScript. As a templating engine, Hogan.js allows developers to inject data into templates and render the final HTML. It is efficient, flexible, and easy to use, which makes it a popular choice for web development.

Key Features and API Examples

Here are some essential API examples that showcase the capabilities of Hogan.js:

Basic Template Rendering

You can compile a template and render it with data using Hogan.js:

  
  const Hogan = require('hogan.js');
  const template = Hogan.compile('Hello, {{name}}!');
  const output = template.render({ name: 'World' });
  console.log(output);  // Output: Hello, World!
  

Partials

Hogan.js supports the inclusion of partial templates within main templates for better modularity:

  
  const mainTemplate = Hogan.compile('My name is {{>nameTemplate}}.');
  const partials = {
    nameTemplate: Hogan.compile('{{firstName}} {{lastName}}')
  };
  const data = { firstName: 'John', lastName: 'Doe' };
  const output = mainTemplate.render(data, partials);
  console.log(output);  // Output: My name is John Doe.
  

Conditional Sections

Rendering conditional sections based on the provided data:

  
  const template = Hogan.compile('{{#isUser}}Welcome back, {{name}}!{{/isUser}}');
  const data = { isUser: true, name: 'Alice' };
  const output = template.render(data);
  console.log(output);  // Output: Welcome back, Alice!
  

Loops

Hogan.js can iterate over arrays and render each item:

  
  const template = Hogan.compile('
{{#items}}
{{.}}
{{/items}}
');
  const data = { items: ['Apple', 'Banana', 'Cherry'] };
  const output = template.render(data);
  console.log(output);  // Output: <ul><li>Apple</li><li>Banana</li><li>Cherry</li></ul>
  

App Example with Hogan.js

Let’s put all these together into a full application example:

  
  const express = require('express');
  const Hogan = require('hogan.js');
  const app = express();

  app.get('/', (req, res) => {
    const mainTemplate = Hogan.compile(`
      <h1>User Information</h1>
      <p>My name is {{>nameTemplate}}.</p>
      {{#hobbies}}
      <p>I love {{.}}</p>
      {{/hobbies}}
      {{^hobbies}}
      <p>I have no hobbies.</p>
      {{/hobbies}}
    `);
    const partials = {
      nameTemplate: Hogan.compile('{{firstName}} {{lastName}}')
    };
    const data = {
      firstName: 'John',
      lastName: 'Doe',
      hobbies: ['reading', 'travelling']
    };
    const output = mainTemplate.render(data, partials);
    res.send(output);
  });

  app.listen(3000, () => console.log('Server is running on port 3000'));
  

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Hogan.js is a powerful templating engine for JavaScript, providing flexibility and efficiency for dynamically generating HTML content. With features like partials, conditionals, and loops, it offers a comprehensive toolset for developers to build dynamic and maintainable web applications.

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