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How can you simplify your web app code with client-side templating?

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Web apps often need to dynamically render data from various sources, such as APIs, databases, or user inputs. However, writing and maintaining the code that manipulates the DOM (Document Object Model) can be tedious, error-prone, and hard to read. That's where client-side templating comes in. Client-side templating is a technique that allows you to define reusable HTML templates with placeholders for data, and then fill them with the data at runtime. In this article, you'll learn how client-side templating can simplify your web app code, what are some of the benefits and challenges of using it, and how to get started with some popular templating libraries.

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1 What is client-side templating?

Client-side templating is a way of creating HTML content on the fly, based on predefined templates and data. A template is a piece of HTML code that has placeholders for data, usually marked with special syntax, such as {{name}} or <% title %>. A data source is an object or an array that contains the values for the placeholders. A templating engine is a library or a framework that takes the template and the data source, and generates the final HTML output. For example, if you have a template like this:

<h1>{{title}}</h1>
<p>{{description}}</p>

And a data source like this:

{
  title: "How to use client-side templating",
  description: "Learn how to simplify your web app code with this technique"
}

The templating engine will produce this HTML output:

<h1>How to use client-side templating</h1>
<p>Learn how to simplify your web app code with this technique</p>

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2 Why use client-side templating?

Client-side templating can offer several advantages for web app development, such as reducing the amount of code you need to write and maintain, improving the readability and structure of your code, enhancing the performance and user experience of your web app, and increasing the flexibility and reusability of your code. This is achieved by avoiding repetitive DOM manipulation and string concatenation, separating the presentation logic from the business logic, minimizing server-side rendering and network requests, and creating modular and customizable templates that can be used in different contexts.

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Mostafa Altahan

Web Developer, PHP / WordPress developer
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This type of coding results in great work productivity and help back-end developers focus on tasks more than how it will appear on client screens and leave that step to other teams in the project.

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3 What are the challenges of client-side templating?

Client-side templating is not a silver bullet and comes with some trade-offs and challenges. These include adding complexity and dependencies to your web app, increasing the size and loading time of your web app, exposing the risk of cross-site scripting (XSS) attacks, and limiting the SEO (Search Engine Optimization) and accessibility of your web app. To use client-side templating, you must learn a new syntax and library or framework, add more JavaScript code and files to your bundle, properly sanitize and escape data, and rely on JavaScript execution and dynamic rendering. This may not be supported or indexed by some crawlers or browsers.

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Mostafa Altahan

Web Developer, PHP / WordPress developer
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I have been working on WordsPress CMS for few years and found a great resources in its templating (theme) system that can benefit the idea. Some of the challenges of WordPress templating are: Learning PHP to customize the theme beyond basic options. Choosing the right tools for the site architecture, such as full-site editing or dynamic templating and Keeping up with WordPress updates that may affect the theme functionality or compatibility.

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4 How to choose a client-side templating library or framework?

When it comes to client-side templating, there are plenty of options to choose from with their own features, syntax, and popularity. Mustache and Handlebars are two of the most widely used libraries that use a logic-less template syntax. This means they support basic placeholders and expressions but no control flow or logic. They are easy to learn and can be integrated with any JavaScript library or framework. Handlebars is an extension of Mustache that adds some extra features, such as helpers, partials, and custom delimiters. EJS and Underscore are two other templating libraries that use a more powerful and flexible template syntax that allow embedding of JavaScript code and logic into the templates. They are more expressive and versatile but also more complex and error-prone. React and Vue are full-fledged JavaScript frameworks that use a component-based approach to create user interfaces with a special syntax called JSX (for React) or templates (for Vue). While they offer more functionality and features, such as state management, routing, and lifecycle methods, they require more setup and configuration, as well as a steeper learning curve.

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Mostafa Altahan

Web Developer, PHP / WordPress developer
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Choosing the templating system to work on I think depends on what framework or CMS you are working with. That and the impact of the resulting client interface on efficiency and SEO score are most important points to consider when I start working in a template.

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5 How to get started with client-side templating?

If you want to try out client-side templating, here are a few steps you can follow. First, select a templating library or framework that meets your needs and preferences, and become familiar with its syntax and features. Then, create a template file or script tag containing HTML with placeholders for data. Create a data source file or variable with your data object or array. Include the templating library or framework script in your HTML page, and link or embed your template and data source files or tags. Finally, use the templating engine's API or method to render your template with your data source, and append or replace the HTML output to your target element in the DOM. For example, if you want to use Handlebars, you can include its script in your HTML page, define the template and data source in script tags, then render the template and append it to the body.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How can you simplify your web app code with client-side templating?

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6

1 What is client-side templating?

2 Why use client-side templating?

3 What are the challenges of client-side templating?

4 How to choose a client-side templating library or framework?

5 How to get started with client-side templating?

6 Here’s what else to consider

Web Applications

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How can you simplify your web app code with client-side templating?

1

2

3

4

5

6

1 What is client-side templating?

2 Why use client-side templating?

3 What are the challenges of client-side templating?

4 How to choose a client-side templating library or framework?

5 How to get started with client-side templating?

6 Here’s what else to consider

Web Applications

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