{"id":15175,"date":"2016-11-09T12:15:12","date_gmt":"2016-11-09T10:15:12","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=15175"},"modified":"2016-11-08T14:22:02","modified_gmt":"2016-11-08T12:22:02","slug":"handlebars-dynamic-way","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/handlebars-dynamic-way\/","title":{"rendered":"Handlebars &#8211; A More Dynamic Way"},"content":{"rendered":"<p>Handlebars.js is a popular templating engine extension to\u00a0the Mustache template language. While this post is not intended as an introduction to Handlebars, make sure to visit the Handlebars\u2019 website <a href=\"http:\/\/handlebarsjs.com\/\" target=\"_blank\">here<\/a> for that introduction.<\/p>\n<p>In this post, we\u2019ll take a more philosophical role. We will explore how Handlebars is a dynamic template creation tool and what benefits logic-less templates afford us. During our discussion we will cover Handlebars\u2019 precompiling, partials, and helpers, and how each supports or contradicts dynamic and logic-less templates.<\/p>\n<h3>Static and Dynamic<\/h3>\n<p>When it comes to developing html structure, there are two main avenues of thought: static and dynamic.<br \/>\nStatic html construction is a one-to-one relationship of page-to-purpose. A single html document would display one, and only one, specific web page as part of a multi-page website.<\/p>\n<p>Dynamic html construction is the culmination of a multipurpose page, capable of modifying its content to suit different uses. This often lends itself to single-page web applications.<\/p>\n<p>The issue with static pages is that they can only be used once for its intended purpose. There exist many ideas of how best to implement a dynamic web-based solution. I have found that Handlebars does a good job in simplifying dynamic html construction.<\/p>\n<p><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars1.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-15177\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars1.png\" alt=\"handlebars1\" width=\"654\" height=\"244\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars1.png 654w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars1-300x112.png 300w\" sizes=\"(max-width: 654px) 100vw, 654px\" \/><\/a><br \/>\nversus<\/p>\n<p><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars2.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-15178\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars2.png\" alt=\"handlebars2\" width=\"336\" height=\"229\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars2.png 336w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars2-300x204.png 300w\" sizes=\"(max-width: 336px) 100vw, 336px\" \/><\/a><\/p>\n<p>Given the above examples, we see that while Handlebars is programmatically equivalent to the code-based implementation. It also provides readability and maintainability. A static page must rely heavily upon DOM (Document Object Model) insertions to display similarly to those dynamically built.<\/p>\n<p>Also, while the code-based implementation could provide a faster process time (marginally), the readability is lessened. As structure and code is closely coupled the scalability is decreased. Handlebars\u2019 emphasis on separation of concerns allows template enhancements or defects to be resolved quickly and effectively.<\/p>\n<h3>To Pre-Compile or Not to Pre-Compile<\/h3>\n<p>One of the main questions that should be considered when building Handlebars templates is whether we should compile or pre-compile our templates. Standard Handlebars compilation occurs during runtime while pre-compilation occurs during the build process, before deployment.<\/p>\n<p>It is my opinion that there isn\u2019t much excuse not to pre-compile Handlebar templates. Pre-compiled templates continue to offer dynamic solutions while both utilizing the smaller Handlebars runtime library and reducing browser computation time. This leads to faster page loads and a smoother user experience, especially as the application grows.<\/p>\n<figure id=\"attachment_15179\" aria-describedby=\"caption-attachment-15179\" style=\"width: 461px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars3.png\"><img decoding=\"async\" class=\"wp-image-15179 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars3.png\" alt=\"handlebars3\" width=\"461\" height=\"152\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars3.png 461w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars3-300x99.png 300w\" sizes=\"(max-width: 461px) 100vw, 461px\" \/><\/a><figcaption id=\"caption-attachment-15179\" class=\"wp-caption-text\">*Templates were processed 1000 times each. The last number indicates the number of milliseconds required to process each template.<\/figcaption><\/figure>\n<p>The world of NodeJS, and consequently NPM, is vast, intimidating, and outside the scope of this discussion. It is an excellent tool which greatly simplifies and enables front end development. I mention it solely to introduce the <code>grunt-contrib-handlebars<\/code> package. Installation and setup can be found <a href=\"https:\/\/www.npmjs.com\/package\/grunt-contrib-handlebars\">here<\/a>.<\/p>\n<p>Through use of the <code>grunt-contrib-handlebars<\/code>, we can automate (to an extent) the pre-compilation process for all our Handlebars templates.<\/p>\n<figure id=\"attachment_15180\" aria-describedby=\"caption-attachment-15180\" style=\"width: 571px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars4.png\"><img decoding=\"async\" class=\"wp-image-15180 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars4.png\" alt=\"handlebars4\" width=\"571\" height=\"246\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars4.png 571w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars4-300x129.png 300w\" sizes=\"(max-width: 571px) 100vw, 571px\" \/><\/a><figcaption id=\"caption-attachment-15180\" class=\"wp-caption-text\">*With the given configuration templates can be called with: Templates.().<\/figcaption><\/figure>\n<p>By this point, the process of building our Handlebars templates has been greatly simplified.<\/p>\n<p><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars5.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-15181\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars5.png\" alt=\"handlebars5\" width=\"458\" height=\"163\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars5.png 458w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars5-300x107.png 300w\" sizes=\"(max-width: 458px) 100vw, 458px\" \/><\/a><\/p>\n<h3>Partials<\/h3>\n<p>One cool feature of Handlebars is the ability to call a template from within another template. Template inception? Templateception? Lame? You decide. These templates are referred to as \u201cpartials.\u201d Partials can be utilized within other templates or act as standalone templates themselves.<\/p>\n<p>If a template is intended as a partial, it must be registered as such. To register a template as a partial we\u2019ll need to modify our Handlebars file accordingly. All that is required is to put an underscore \u2018_\u2019 prepended to the file name.<\/p>\n<p>I prefer to register all templates as partials, thus ensuring the option exists to choose between partials or standalone templates.<\/p>\n<p>Partials are of vital importance as it simplifies and streamlines the html build process. There are multiple coding techniques that can replicate the same end result, albeit, in a more convoluted orchestration.<\/p>\n<p><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars6.png\"><img decoding=\"async\" class=\"aligncenter wp-image-15182\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars6.png\" alt=\"handlebars6\" width=\"860\" height=\"477\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars6.png 892w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars6-300x166.png 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2016\/11\/Handlebars6-768x426.png 768w\" sizes=\"(max-width: 860px) 100vw, 860px\" \/><\/a><\/p>\n<p>Other benefits include the ability to use preconfigured templates to quickly insert items into a list. Also, to enable quick sorting and rendering of one list while not affecting other elements on a page. This modularity of template creation lends itself well to the development process.<\/p>\n<p>In code development, redundant functionality and\/or large segments should be broken up into smaller, more maintainable sections. This same philosophy can be mirrored within template creation.<\/p>\n<h3>Logic-Less Versus Logic-Full<\/h3>\n<p>The debate between logic-less and logic-full template structure is a long one. Both sides of the debate hold strong opinions about why their process is superior.<\/p>\n<p>Logic-less is the idea that html templates shouldn\u2019t incorporate logic statements of any kind, and that the work of building dynamically should be handled separately within a different, yet associated, file.<\/p>\n<p>Logic-full plays opposite to logic-less by suggesting that both template and business logic should be tightly coupled, oftentimes within the same file.<\/p>\n<p>While logic-less is almost completely unattainable without going to great lengths to separate concerns, code, and everything else, the concept should be more appropriately named less-logic. Ideally, a less-logical approach would encourage readability and maintainability while sacrificing the full power of whichever programming language is being utilized. Handlebars, while traveling down the logic-less road, is designed to give templates the option of being as logic-light or logic-heavy as desired.<\/p>\n<p>Regardless of which philosophy you subscribe, Handlebars is a lightweight tool that can accommodate both. As with all tooling there are caveats and possibly some items which you may entirely disagree. That being said below is some of the more intermediate to advanced concepts that Handlebars addresses.<\/p>\n<h3>Registered Helpers<\/h3>\n<p>Another feature of Handlebars is the idea of registered helpers. These helpers are additional functionality, logic, which can be customized and inserted into a template. Some of these helpers already exist as if statements and iterators.<\/p>\n<p>Handlebars, in keeping with logic-less methodologies, provided a bare minimum of such functionality. However, Handlebars doesn\u2019t limit the addition of more logic if the development team decides to take a more logic-full route.<\/p>\n<p>For logic-less route we may want to provide a JSON translator to sanitize the template context. This would eliminate the need of multiple registered helpers. In contrast, a logic-full route would convert and sanitize the data during template construction.<\/p>\n<h3>Conclusion<\/h3>\n<p>As I begin a web application, my first thought usually goes to the structure. The html structure helps me visualize and identify the overall feel of the application. The nice thing about Handlebars is that it visually represents the DOM while allowing a dynamic element as things change.<\/p>\n<p>Is Handlebars the only solution that offers this? No. However, in my experience its capabilities make it a very appealing library for front end development.<\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td><span class=\"reference\">Reference: <\/span><\/td>\n<td><a href=\"https:\/\/keyholesoftware.com\/2016\/11\/07\/handlebars-a-more-dynamic-way\/\">Handlebars &#8211; A More Dynamic Way<\/a> from our <a href=\"http:\/\/www.webcodegeeks.com\/join-us\/wcg\/\">WCG partner<\/a>\u00a0Dagin Fulmer\u00a0at the <a href=\"http:\/\/keyholesoftware.com\/\">Keyhole Software<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Handlebars.js is a popular templating engine extension to\u00a0the Mustache template language. While this post is not intended as an introduction to Handlebars, make sure to visit the Handlebars\u2019 website here for that introduction. In this post, we\u2019ll take a more philosophical role. We will explore how Handlebars is a dynamic template creation tool and what &hellip;<\/p>\n","protected":false},"author":198,"featured_media":920,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[402],"class_list":["post-15175","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-handlebars-js"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Handlebars - A More Dynamic Way - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Handlebars.js is a popular templating engine extension to\u00a0the Mustache template language. 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