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Web template system

what is web template system, what is web template system
A web template system uses a template processor to combine web templates to form finished web pages, possibly using some data source to customize the pages or present a large amount of content on similar-looking pages It is a web publishing tool present in content management systems, web application frameworks, and HTML editors

Web templates can be used like the template of a form letter to either generate a large number of "static" unchanging web pages in advance, or to produce "dynamic" web pages on demand

Contents

  • 1 Overview
  • 2 Motivations and typical uses
    • 21 Applications
    • 22 Mass-production
    • 23 Style standardization
    • 24 Separation of concerns
    • 25 Flexible presentation
    • 26 Reusability
  • 3 Example
  • 4 Kinds of template systems
    • 41 Static page generators
    • 42 Server-side systems
    • 43 Edge-side systems
    • 44 Client-side systems
    • 45 Distributed systems
  • 5 See also
  • 6 References
  • 7 External links

Overview

A web template system is composed of the following:

  • A template engine: the primary processing element of the system;
  • Content resource: any of various kinds of input data streams, such as from a relational database, XML files, LDAP directory, and other kinds of local or networked data;
  • Template resource: web templates specified according to a template language;

The template and content resources are processed and combined by the template engine to mass-produce web documents For purposes of this article, web documents include any of various output formats for transmission over the web via HTTP, or another Internet protocol

Motivations and typical uses

Applications

Web templates can be used by any individual or organization to set up their website Once a template is purchased or downloaded, the user will replace all generic information included in the web template with their own personal, organizational or product information Examples of common uses of Templates are listed below:

  • Display personal information or daily activities as in a blog
  • Sell products on-line
  • Display information about a company or organization
  • Display family history
  • Display a gallery of photos
  • Place music files such as MP3 files on-line for play through a web browser
  • Place videos on-line for public viewing
  • To set up a private login area on-line

Mass-production

Various agencies and organizations use web template systems for mass-production of content when slower production alternatives prove unfeasible

For an introductory overview, take a news website as an example Consider a "static website", where all web pages are static, built by a web designer It would be very repetitive work to change individual pages as often as the news changes A typical strategy to automate the web designer's "repetitive work" using Templates could be as follows:

  1. choose a web template system to maintain the website;
  2. group news items with different presentation needs;
  3. specify the "presentation standards" through web templates, for each group of news;
  4. specify a content resource to generate or update the content of each news item

Style standardization

Separation of concerns

Main article: Separation of concerns

A common goal among experienced web developers is to develop and deploy applications that are flexible and easily maintainable An important consideration in reaching this goal is the separation of business logic from presentation logic Developers use web template systems with varying degrees of success to maintain this separation

For the web designer, when each web page comes from a web template, they can think about a modular web page structured with components that can be modified independently of each other These components may include a header, footer, global navigation bar GNB, local navigation bar and content such as articles, images, videos etc

For programmers the template language offers a more restricted logic, only for presentation adaptations and decisions, not for complex business model algorithms

For other members of the "site team", a template system frees webmasters to focus on technical maintenance, content suppliers to focus on content, and gives all of them more reliability

Moreover, it has the following advantages to its use:

  • Ease of design change: presentation variations on templates are "content invariant", meaning a web designer can update the presentation without wider infrastructural preoccupations
  • Ease of interface localization: menus and other presentation standards are easy to make uniform, for users browsing on the site
  • Possibility to work separately on design and code by different people at the same time

One difficulty in evaluating separation of concerns is the lack of well-defined formalisms to measure when and how well it is actually met There are, however, fairly standard heuristics that have been borrowed from the domain of software engineering These include 'inheritance' based on principles of object-oriented programming; and 'templating and generative programming', consistent with the principles of MVC separation The precise difference between the various guidelines is subject to some debate, and some aspects of the different guidelines share a degree of similarity

Flexible presentation

One major rationale behind "effective separation" is the need for maximum flexibility in the code and resources dedicated to the presentation logic Client demands, changing customer preferences and desire to present a "fresh face" for pre-existing content often result in the need to dramatically modify the public appearance of web content while disrupting the underlying infrastructure as little as possible

The distinction between "presentation" front end and "business logic" infrastructure is usually an important one, because:

  • the presentation source code language may differ from other code assets
  • the production process for the application may require the work to be done at separate times and locations
  • different workers have different skill sets, and presentation skills do not always coincide with skills for coding business logic
  • code assets are easier to maintain and more readable when disparate components are kept separate and loosely coupled

Reusability

Not all potential users of web templates have the willingness and ability to hire developers to design a system for their needs Additionally, some may wish to use the web but have limited or no technical proficiency For these reasons, a number of developers and vendors have released web templates specifically for reuse by non-technical people Although web template reusability is also important for even highly skilled and technically experienced developers, it is especially critical to those who rely on simplicity and "ready-made" web solutions

Such "ready-made" web templates are sometimes free, and easily made by an individual domestically However, specialized web templates are sometimes sold online Although there are numerous commercial sites that offer web templates for a licensing fee, there are also free and "open-source" sources as well

Example

With the model typically held in a relational database, the remaining components of the MVC architecture are the control and view In the simplest of systems these two are not separated However, adapting the separation of concerns principle one can completely decouple the relationship

For example, the view template may look like this:

<!DOCTYPE html> <html xmlns="http://wwww3org/1999/xhtml"> <head><title>Sites</title></head> <body><h1 data-xp="title"><!-- placeholder --></h1></body> </html>

Then the control template will load the view and then can use xpath addressing to insert components from a database, for instance:

<php $doc = new DOMDocument; $doc->preserveWhiteSpace = false; $doc->Load'viewhtml'; $titlenode = $doc->createTextNode"Like this"; $xpath = new DOMXPath$doc; $xpath->registerNamespace"h","http://wwww3org/1999/xhtml"; $query="//h:/comment"; $entries = $xpath->query$query; foreach $entries as $entry echo $doc->saveXML; >

Kinds of template systems

A web browser and web server are a client–server architecture; often a web cache is also used to improve performance Overall, there are five types of templating systems, classified based on when assembly happens - placeholders are substituted for variable information such as names, addresses, and product info and sub-templates:

  • Server-side - run-time substitution happens on the web server
  • Client-side - run-time substitution happens in the web browser
  • Edge-side - run-time substitution happens on a proxy between web server and browser
  • Outside server - static web pages are produced offline and uploaded to the web server; no run-time substitution
  • Distributed - run-time substitution happens on multiple servers

Template languages may be:

  • Embedded or event-driven
  • Simple, iterable, programmable, or complex
  • Defined by a consortium, privately defined, or de facto defined by an open implementation Ownership influences the stability and credibility of a specification However, in most jurisdictions, language specification cannot be copyrighted, so control is seldom absolute

The source code of the template engine can be proprietary or open source

Many template systems are a component of a larger programming platform or framework They are referred to as the "platform's template system" Some template systems have the option of substituting a different template language or engine

Programming languages such as Perl, Ruby, C, and Java support template processing either natively, or through add-on libraries and modules JavaServer Pages JSP, PHP, and Active Server Pages ASP with VBScript, JScript or other languages are examples, themselves, of web template engines These technologies are typically used in server-side templating systems, but could be adapted for use on a "edge-side" proxy or for static page generation

Static page generators

Outside server template system architecture

HTML editors often use web template systems to produce only static web pages These can be viewed as a ready-made web design, used to mass-produce "cookie-cutter" websites for rapid deployment They also commonly include themes in place of CSS styles In general, the template language is to be used only with the editor's software

FrontPage and Dreamweaver are the most popular editors with template sub-system A Flash web template uses Macromedia Flash to create visually interactive sites

System label/name Platform/editor Notes
Dreamweaver Macromedia HTML authoring Embedded iterable language
Flash Macromedia Flash authoring
FrontPage Microsoft HTML authoring Embedded iterable language
Nvu Linux/Nvu HTML authoring
Website Meta Language Unix-like

Many server-side template systems have the option to publish the output pages on the server, where the published pages will be static It is a common feature on content management systems, like Vignette But this does not have to be considered an out-server generation

In the majority of the cases, this "publish option" doesn't interfere with the template system, and it can be made by external software, as Wget

Server-side systems

Server-side template system

Server-side dynamic pages began to be generated by templates with pre-existent software adapted for this task This early software was the preprocessors and macro languages, adapted for the web use, running on CGI Next, a simple but relevant technology was the direct execution made on extension modules, started with SSI

Many template systems are typically used as server-side template systems:

System label/name Platform/framework Notes
CheetahTemplate Python Public Embedded complex language
Django Python Use the "Django template language"
FreeMarker Java Public
Facelets Java EE Public Part of JavaServer Faces
Genshi Python Public
Haml Ruby or Other Public
Hamlets Java Public
Jinja2 Python Public Embedded complex language
Kid Python
Lasso LassoSoft, LLC Proprietary Interpreted Programming Language and Server
Mustache ActionScript, C++, Clojure, CoffeeScript, ColdFusion, D, Erlang, Fantom, Go, Java, server-side JavaScript, Lua, NET, Objective-C, ooc, Perl, PHP, Python, Ruby, Scala, Tcl Public
Basic Server Side Includes SSI The basic directives fix a "standard" Embedded simple language, if exclude exec directive
Smarty PHP Public Embedded complex language
Template Toolkit Perl Public Embedded complex language
Template Attribute Language TAL Zope, Python, Java, Perl, PHP, XSLT Public; aka Zope Page Templates ZPT; see also TAL Expression Syntax TALES, Macro Expansion TAL METAL
Tiles Java Public Supports multiple template languages JSP, Velocity, Freemarker, Mustache from various frameworks servlet, portlets, struts, spring
Thymeleaf Java Public
Topsite Python Public "As of 2008-02-20, this project is no longer under active development"
PHPlib PHPlib Public Embedded iterable language
WebMacro Java Public Embedded iterable language
WebObjects Java Use the WebObjects Builder as engine
Velocity Jakarta/Apache Java Public Use VTL - Velocity Template Language
Vignette Proprietary Commercial solution Embedded complex language
VlibTemplate PHP Public
XSLT standard language Any with an XSLT parser Standard Event-driven programmable language
XQuery standard language Any with an XQuery parser Standard Embedded programmable language

Technically, the methodology of embedding programming languages within HTML or XML, etc, used in many "server-side included script languages" are also templates All of them are Embedded complex languages

System label/name Notes
Active Server Pages ASP Proprietary Microsoft platform See also: VBScript, Javascript, PerlScript, etc extensions for ASP
eRuby Public Ruby
ColdFusion Markup Language CFM Public Lucee, Railo, OpenBD Proprietary Adobe ColdFusion
JavaServer Pages JSP Public, Java platform
Active Perl Public
PHP Public
OpenACS Public Tcl

There are also preprocessors used as server-side template engines Examples:

Preprocessor Notes
C preprocessor Public Embedded iterable language
M4 Public Embedded complex language

Edge-side systems

Edge-Side template and inclusion systems “Edge-side” refers to web servers that reside in the space between the client browser and the originating server They are often referred to as “reverse-proxy” servers These servers are generally tasked with reducing the load and traffic on originating servers by caching content such as images and page fragments, and delivering this to the browser in an efficient manner

Basic Edge Side Includes ESI is an SSI-like language ESI has been implemented for content delivery networks The ESI template language may also be implemented in web browsers using JavaScript and Ajax, or via a browser "plug-in"

Client-side systems

Client-side and distributed decentralized template system

Many web browsers can apply an XSLT stylesheet to XML data that transforms the data into an XHTML document, thereby providing template functionality in the browser itself
Other systems implement template functionality in the browser using JavaScript or another client-side scripting language, including:

  • Mustache

Distributed systems

The most simple form is transclusions HTML frames In other cases dynamic web pages are needed

Examples:

  • Ajax
  • Rich Internet application

See also

  • Comparison of web template engines
  • Template processor
  • Boilerplate code
  • Bytecode
  • CodeCharge Studio
  • Jekyll software
  • Layout engine
  • Macro computer science - section Text substitution macros
  • Preprocessor
  • Template file format
  • UIML User Interface Markup Language
  • XSLT
  • Virtual machine

References

  1. ^ "Template engine" phpwactorg wiki Archived from the original on December 4, 2012 Retrieved 7 January 2013 
  2. ^ a b c Parr, Terence John 2004 Enforcing strict model-view separation in template engines Proceedings of the 13th international conference on World Wide Web ISBN 1-58113-844-X 
  3. ^ a b c Paragon Corporation 2003-07-19 "Separation of Business Logic from Presentation Logic in Web Applications" 
  4. ^ MVC vs OOP
  5. ^ MacDonald, Matthew 2015 Creating a Website: The Missing Manual Chapter 8 > Putting the Same Content on Multiple Pages > Web Templates > Note box: O'Reilly Media, Inc ISBN 9781491936177 Retrieved 19 January 2016 
  6. ^ "" Retrieved 15 October 2013 
  7. ^ jodyburns "Topsite Templating System" Retrieved 15 October 2013 
  8. ^ Website, Templates 2013 Wordpress Website Templates 

External links

  • JavaScript template libraries comparison from 2009
  • Enforcing Strict Model-View Separation in Template Engines
  • A Double-Model Approach to Achieve Effective Model-View Separation in Template Based Web Applications
  • A PHP template engine comparison with graphic charts
  • Comparisons/benchmarks of some Python template-engines and some generic thoughts about template-engines
  • web-modeel is an emacs major for editing web templates

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    29.10.2014


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