Conditional On Last Item In Array Using Handlebars Js Template

When working with Handlebars.js, a popular templating engine for JavaScript, you may encounter situations where you need to apply specific logic based on the last item in an array. This can be a powerful feature when you want to customize the behavior or appearance of your templates dynamically. In this article, we will walk you through how to conditionally check for the last item in an array using Handlebars.js templates.

To begin, let's set up a basic example to demonstrate how to achieve this functionality. Imagine you have an array of products that you want to display in a template, and you want to highlight the last product in a different way. Here's how you can accomplish this using Handlebars.js:

First, ensure you have included the Handlebars.js library in your project. You can either download it and include it manually or use a package manager like npm to install it.

Next, let's define our template. You can create a simple Handlebars template like the following:

Html

<div class="products">
  {{#each products}}
    <div class="product{{#if @last}} last-product{{/if}}">
      <h3>{{name}}</h3>
      <p>{{description}}</p>
    </div>
  {{/each}}
</div>

In this template, we are using the `#each` helper to iterate over the `products` array. The `@last` keyword provided by Handlebars.js allows us to check if the current item is the last one in the array. If it is the last item, we apply the `last-product` class to style it differently.

Now, let's compile our template and render it with some sample data:

Javascript

const source = document.getElementById('product-template').innerHTML;
const template = Handlebars.compile(source);

const products = [
  { name: 'Product 1', description: 'Description 1' },
  { name: 'Product 2', description: 'Description 2' },
  { name: 'Product 3', description: 'Description 3' }
];

const context = { products };
const html = template(context);

document.getElementById('app').innerHTML = html;

In this JavaScript code snippet, we first compile our template using `Handlebars.compile`. Then, we provide some sample product data and render the template with the data by passing it through the compiled template function.

By applying the `last-product` class conditionally based on the `@last` keyword, you can customize the styling or behavior of the last item in the array in your Handlebars.js templates. This powerful feature allows you to create dynamic and engaging templates for your web applications.

In summary, Handlebars.js provides a convenient way to work with arrays and conditionally check the last item in an array within your templates. By leveraging the `@last` keyword, you can easily customize the rendering of your templates based on the position of elements in an array. Incorporate this technique into your projects to enhance the flexibility and interactivity of your web applications.

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