Handlebars Template Guide

Handlebars is a popular templating language for JavaScript. It allows you to define the structure of your HTML templates and separate them from your JavaScript code. Below is a brief guide on how to use Handlebars templates.

Features

• Simple Syntax: Handlebars uses a simple syntax that is easy to learn and understand.
• Extensible: You can create your own helpers and extend Handlebars.
• Secure: It helps to prevent XSS (Cross-Site Scripting) attacks by automatically escaping HTML.

Getting Started

To use Handlebars, you need to include it in your HTML file. You can download it from the Handlebars website.

<script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.7.7/handlebars.min.js"></script>

Basic Example

Here's a basic example of a Handlebars template:

<script id="entry-template" type="text/x-handlebars-template">
  <h1>{{title}}</h1>
  <p>{{body}}</p>
</script>

You can use this template in your JavaScript code like this:

var source = document.getElementById("entry-template").innerHTML;
var template = Handlebars.compile(source);
var context = {title: "Hello, world!", body: "This is a simple Handlebars template."};
var html = template(context);
document.write(html);

Tags and Helper Functions

Handlebars has a set of tags and helper functions that you can use to create dynamic templates.

Tags

• {{ }}: Text tags are used to output text.
• {{# }}: Section tags are used to output repeated content.
• {{^ }}: Inverse section tags are used to output content when a condition is not met.

Helper Functions

• {{#each}}: Iterates over an array or object.
• {{#if}}: Outputs content when a condition is true.
• {{#unless}}: Outputs content when a condition is false.

Image Example

Here is an example of how to include an image in your template:

<script id="image-template" type="text/x-handlebars-template">
  <h1>{{title}}</h1>
  <p>{{body}}</p>
  <center><img src="https://cloud-image.ullrai.com/q/image/{{imageUrl}}" alt="{{title}}"/></center>
</script>

In this example, {{imageUrl}} is a placeholder for the image URL.

Conclusion

Handlebars is a powerful templating language that can help you create dynamic and maintainable web applications. For more information, please visit the Handlebars documentation.