Javascript template engine

What is the "E" for? How about "Effective," "Elegant," or just "Easy"? No religiousness about how to organize things. No reinvention of iteration and control-flow. It's just plain JavaScript. We love JavaScript. It's a totally friendly language. All templating languages grow to be Turing-complete. Just cut out the middle-man, and use JS! Don't waste time and attention figuring out arcane new syntax because 'elegance' — or how to preprocess your data so it will actually render right.

JavaScript code in simple, straightforward scriptlet tags. We all know how fast V8 and the other JavaScript runtimes have gotten. EJS caches the intermediate JS functions for fast execution. It's easy to debug EJS errors: your errors are plain JavaScript exceptions, with template line-numbers included.

EJS has a large community of active users, and the library is under active development. We're happy to answer your questions or give you help. Download a browser build from the latest releaseand use it in a script tag.

Includes are relative to the template with the include call. This requires the 'filename' option. For example if you have ". EJS ships with a basic in-process cache for caching the intermediate JavaScript functions used to render templates. If you want to clear the EJS cache, call ejs. The default file loader is fs. EJS does not specifically support blocks, but layouts can be implemented by including headers and footers, like so:.

Go to the latest releasedownload. Ask questions about specific problems you have faced, including details about what exactly you are trying to do. Make sure you tag your question with ejs. You can also read through existing ejs questions.

JavaScript template engine in just 20 lines

The issue tracker is the preferred channel for bug reports, features requests and submitting pull requests. EJS is licensed under the Apache License, version 2. Get Started. What is EJS?You may have heard of or even used JavaScript templating engines such as Handlebars.

They can make rendering and updating dynamic content on your website a breeze, but if your needs are dead simple, you might not need a library. Instead, if a template of the markup is available client-side, we can get just the data via Ajax as a object or an arraythen parse the data and generate the final HTML using the template.

The browser ignores the script because the type is not recognized, but the content is still accessible, which we can use when generating HTML. The following JavaScript parses the data and replaces the placeholders of the template with the data from the object. If you prefer or need to work with arrays, the implementation is slightly different.

javascript template engine

Based on your needs, you may want to rely on a more robust JavaScript templating library like Underscore. There are a plethora of tools, frameworks, and libraries you can depend on, but the key is to properly assess your needs and find the right tools for the job.

More about me. Follow jonsuh. Why JavaScript Templating? Totam quisquam asperiores laborum quae doloremque voluptates explicabo libero deserunt qui.Hi there, I'm Krasimir.

Senior front-end engineer with over 13 years of experience. I writespeak and occasionally code stuff. Follow KrasimirTsonev. Of course, because it generates HTML it was normal to act as a template engine. So, I wanted to write a simple template engine logic, which work nicely with my current implementation. Having this in mind, I knew that I can't really get some of the existing engines.

That's because most of the them are only NodeJS based and it will be difficult to replicate them in the browser. I needed something small, written in pure JavaScript. I landed on this blog post by John Resig. It looks like the thing which I needed.

I change it a bit and it fits into 20 lines.

javascript template engine

I think that it is quite interesting how the script works. In this article I'll recreate the engine step by step so you could see the wonderful idea which originally came from John. A simple function, which takes our template and a data object. As you may guess, the result which we want to achieve at the end is:.

The very first thing which we have to do is to take the dynamic blocks inside the template.

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Later we will replace them with the real data passed to the engine. I decided to use regular expression to achieve this. That's not my strongest part, so feel free to comment and suggest a better RegExp. The flag g global means that we will get not one, but all the matches. There are a lot of methods which accept regular expressions. However, what we need is an array containing the strings.

That's what exec does. So, we got the data, but as you can see the returned array has only one element. And we need to process all the matches. To do this we should wrap our logic into while loop. If you run the code above you will see that the both and are shown.

javascript template engine

Now it gets interesting. We have to replace placeholders with the real data passed to the function. The most simple thing which we can use is to use.

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We could write something like this:. Ok, this works, but of course it is not enough. We have really simple object and it is easy to use data["property"]. But in practice we may have complex nested objects.This article was peer reviewed by Chris Perry and Ritesh Kumar.

Twig in PHP. As soon as we find ourselves including HTML inside JavaScript strings we should be starting to think about what benefits JavaScript templates could give us. Separation of concerns is of utmost importance when building a maintainable codebase, so anything which can help us achieve this should be explored. Some common scenarios which could benefit from JavaScript templates are real-time web apps for example a live streaming app for event commentaryor internationalization i18nwhich will quite often require that different content is displayed using the same formatting.

Most libraries support both inline and external templates. External templates bring many benefits, chiefly that templates will never be downloaded to the client unless they are needed by the page. Mustache is a multi-language, logic-less templating system. The mustache. See the Pen Mustache. As you can see in this example, the Mustache.

Top 5 Best JavaScript Template Engines

For example loop over an arrayor make use of a special rendering function that uses the current view as its view argument. A key thing to note is that we can start off a project with mustache.

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In a nutshell, it provides everything mustache. Precompiled templates are a big deal as they increase performance by a large margin in a rough performance testprecompiled Handlebars.

Block expressions allow you to include more logic in your templates; one of the more common examples of these are advanced iterators — eg. You can read more about block expressions here.

See the Pen Handlebars. Note that to see the performance benefits of Handlebars. In order to do so efficiently we should add Handlebars. Instead of token replacement techniques it uses data attributes to indicate where data should be inserted in the HTML fragment. Underscore is a popular JavaScript library which provides templating functions amongst a myriad of other features.

Like Underscore. One thing to note with EJS is that templates must be external files — they cannot be inline.

So which is the best? It depends on many things. However as briefly mentioned before, a good flexible strategy would be to implement mustache.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Possible Duplicate: Javascript templating engines?

I keep on stumbling upon javascript templating engines and I have no idea what is their purpose. Could anyone explain me like I were five what are those? Can front-end developer make use of these? JavaScript template engines are often used when writing thick JS-clients or as "normal" template engines when using server-side js like Node. Instead of cluttering the code by generating HTML using string concatenating etc. In frameworks like backbone.

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There are many different types of template engines in JS. Others are developed specially to work with JavaScript i. There is a debate of how much expressiveness the template engine should give you because putting logic in your templates is usually a bad thing. Because of this some template engines are specifically designed to not let you put logic in them i. Learn more.

What is a template engine? Asked 8 years, 1 month ago. Active 2 years, 5 months ago. Viewed 30k times. JS template engines are for doing what should have been done on the server side.

javascript template engine

If you're using them, either you're running node. Those aren't template engines Another example is documentcloud.It shows great performance for both Node. During my quest I found 2 template engines that caught my attention and inspired doT. The first one was jQote2, a jQuery plugin, it was the first engine to break the speeds by using string concatenation and avoiding 'with' statements. The second one was underscore. It is also used to statically compile partials.

This comes in handy when you want to include similar header and footer on multiple pages. Here is the first benchmark of doT in jsperf. Here is a more recent benchmark against the new and upgraded engines that popped up lately. People are constantly adding new javascript template engine benchmarks. By default, the data in the template must be referenced with 'it'.

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To change the default variable name, modify setting 'varname'. For example, if you set 'varname' to "foo, bar" you will be able to pass 2 data instances and refer to them from the template by foo and bar. It allows to tweak performance, depending on the javascript engine used and size of the template, it may produce better results with append set to false.

If 'selfcontained' is true, doT will produce functions that have no dependencies on doT. In general, generated functions have no dependencies on doT, with the exception for encodeHTML and it is only added if encoding is used. If 'selfcontained' is true and template needs encoding, encodeHTML function will be included in the generated template function.

This will compile. Strip whitespaces. Template Compile-time defines def.Template7 is a mobile-first JavaScript template engine with Handlebars -like syntax. It is used as default template engine in Framework7.

It is ultra lightweight around 1KB minified and gzipped and blazing fast up to times faster than Handlebars in mobile Safari. Template7 templates looks like Handlebars templates, it is like regular HTML but with embedded handlebars expressions:.

JavaScript Templating Without a Library

Outputs "title" variable in parent context of parent context. Outputs variable equals to "name" property of "person" variable in current context. Such data variables could be used in helpers. Now we need to compile it in JavaScript.

Template7 will convert our template string to plain JavaScript function:. This plain helper returns escaped HTML string. Block helper for easier compares of context variables.

Helper function could accepts as many arguments as required, arguments could be context, strings and hash data. Or we can create helper to create Framework7's list-block link to work with this syntax:. Note, that all custom helpers should be registered before you compile templates with these helpers! Sometimes we may need to access to initially passed root context in our templates.

This is especially helpful when we are deep in context:. Template7 allows to reuse template using through partials. Partials are normal usual Template7 templates that may be called by other templates.

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Template7 is fast and you can make it even faster in your apps. So don't compile the same templates multiple times, one time will be enough:.

pure.js - Javascript Template Engine

Template7 Template7 is a mobile-first JavaScript template engine with Handlebars -like syntax. It is used as default template engine in Framework7 It is ultra lightweight around 1KB minified and gzipped and blazing fast up to times faster than Handlebars in mobile Safari. First of all we need to deliver string template. The following additional variables are available inside of this helper: index - index number of the item. For arrays only first - equal to true for the first item in array.

For arrays only last - equal to true for the last item in array. For arrays only key - name of current object property.


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