express-hbs

Express 3 handlebars template engine complete with multiple layouts, partials and blocks.

npm install express-hbs
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express-hbs

Express 3 handlebars template engine with multiple layouts, blocks and cached partials.

Open source project from Barc, instant real-time forum on any website.

0.7 BREAKING CHANGES: The logic for layout resolution for layoutsDir, layout and declarative layouts in previous versions stepped on each other. Read Layouts section below on how layouts are resolved.

Usage

To use with express 3.

var hbs = require('express-hbs');

// Use `.hbs` for extensions and find partials in `views/partials`.
app.engine('hbs', hbs.express3({
  partialsDir: __dirname + '/views/partials'
}));
app.set('view engine', 'hbs');
app.set('views', __dirname + '/views');

Options for #express3

hbs.express3({
  partialsDir: "{String/Array} [Required] Path to partials templates, one or several directories",

  // OPTIONAL settings
  blockHelperName: "{String} Override 'block' helper name.",
  contentHelperName: "{String} Override 'contentFor' helper name.",
  defaultLayout: "{String} Absolute path to default layout template",
  extname: "{String} Extension for templates, defaults to `.hbs`",
  handlebars: "{Module} Use external handlebars instead of express-hbs dependency",
  i18n: "{Object} i18n object",
  layoutsDir: "{String} Path to layout templates",
  templateOptions: "{Object} options to pass to template()",
  beautify: "{Boolean} whether to pretty print HTML, see github.com/einars/js-beautify .jsbeautifyrc
});

Partials may use any extension, which is better for syntax highlighting.

Syntax

To mark where layout should insert page

{{{body}}}

To declare a block placeholder in layout

{{{block "pageScripts"}}}

To define block content in a page

{{#contentFor "pageScripts"}}
  CONTENT HERE
{{/contentFor}}

Layouts

There are three ways to use a layout, listed in precedence order

  1. Declarative within a page. Use handlebars comment

    {{!< LAYOUT}}
    

    Layout file resolution:

    If path starts with '.'
        LAYOUT is relative to template
    Else If `layoutsDir` is set
        LAYOUT is relative to `layoutsDir`
    Else
        LAYOUT from path.resolve(dirname(template), LAYOUT)
    
  2. As an option to render

    res.render('veggies', {
      title: 'My favorite veggies',
      veggies: veggies,
      layout: 'layout/veggie'
    });
    

    This option also allows for layout suppression (both the default layout and when specified declaratively in a page) by passing in a falsey Javascript value as the value of the layout property:

    res.render('veggies', {
      title: 'My favorite veggies',
      veggies: veggies,
      layout: null // render without using a layout template
    });
    

    Layout file resolution:

    If path starts with '.'
        layout is relative to template
    Else If `layoutsDir` is set
        layout is relative to `layoutsDir`
    Else
        layout from path.resolve(viewsDir, layout)
    
  3. Lastly, use defaultLayout if specified in hbs configuration options.

Layouts can be nested: just include a declarative layout tag within any layout template to have its content included in the declared "parent" layout. Be aware that too much nesting can impact performances, and stay away from infinite loops!

Helpers

Synchronous helpers

hbs.registerHelper('link', function(text, options) {
  var attrs = [];
  for(var prop in options.hash) {
    attrs.push(prop + '="' + options.hash[prop] + '"');
  }
  return new hbs.SafeString(
    "<a " + attrs.join(" ") + ">" + text + "</a>"
  );
});

# in markup
{{{link 'barc.com' href='http://barc.com'}}}

Asynchronous helpers

hbs.registerAsyncHelper('readFile', function(filename, cb) {
  fs.readFile(path.join(viewsDir, filename), 'utf8', function(err, content) {
    cb(new hbs.SafeString(content));
  });
});

# in markup
{{{readFile 'tos.txt'}}}

i18n support

Express-hbs supports i18n

var i18n = require('i18n');

// minimal config
i18n.configure({
    locales: ['en', 'fr'],
    cookie: 'locale',
    directory: __dirname + "/locales"
});

app.engine('hbs', hbs.express3({
    // ... options from above
    i18n: i18n,  // registers __ and __n helpers
}));
app.set('view engine', 'hbs');
app.set('views', viewsDir);

// cookies are needed
app.use(express.cookieParser());

// init i18n module
app.use(i18n.init);

Engine Instances

Create isolated engine instances with their own cache system and handlebars engine.

var hbs = require('express-hbs');
var instance1 = hbs.create();
var instance2 = hbs.create();

Example

in File app.js

// http://expressjs.com/api.html#app.locals
app.locals({
    'PROD_MODE': 'production' === app.get('env')
});

File views/layout/default.hbs

<html>
  <head>
    <title>{{title}}</title>
    <link type="text/css" rel="stylesheet" href="/css/style.css"/>
    {{{block "pageStyles"}}}
  </head>
  <body>
    {{{body}}}

    {{> scripts}}

    {{#if PROD_MODE}}
    {{{block 'googleAnalyticsScripts'}}}
    {{/if}}

  </body>
</html>

File views/index.hbs

{{!< default}}

{{#contentFor 'pageStyles'}}
<style>
  .clicker {
    color: blue;
  };
</style>
{{/contentFor}}

<h1>{{title}}</h1>
<p class="clicker">Click me!</p>

To run example project

npm install -d
node example/app.js

Testing

The test suite requires the grunt-cli package:

npm install -g grunt-cli
npm install -d

Once everything's installed, just run:

npm test

Credits

Inspiration and code from donpark/hbs

Big thanks to all CONTRIBUTORS

License

The MIT License (MIT)

Copyright (c) 2012-2014 Barc, Inc.

See file LICENSE for copying permissions.

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