基于 Koa平台Node.js开发的KoaHub.js的模板引擎代码

基于 Koa平台Node.js开发的KoaHub.js的模板引擎代码
koahub-handlebars

koahub-handlebars

koahub handlebars templates

Installation

$ npm install koahub-handlebars
Use with koa

var koa = require('koa');
var hbs = require('koahub-handlebars');

var app = koa();

// koahub-handlebars is middleware. `use` it before you want to render a view
app.use(hbs.middleware({
viewPath: __dirname + '/views'
}));

// Render is attached to the koa context. Call `this.render` in your middleware
// to attach rendered html to the koa response body.
app.use(function *() {
yield this.render('index', {title: 'koahub-handlebars'});
})

app.listen(3000);

Registering Helpers

Helpers are registered using the #registerHelper method. Here is an example using the default instance (helper stolen from official Handlebars docs:

hbs = require('koahub-handlebars');

hbs.registerHelper('link', function(text, url) {
text = hbs.Utils.escapeExpression(text);
url = hbs.Utils.escapeExpression(url);

var result = '' + text + '';

return new hbs.SafeString(result);
});
Your helper is then accessible in all views by using, {{link "Google" "http://google.com"}}

The registerHelper, Utils, and SafeString methods all proxy to an internal Handlebars instance. If passing an alternative instance of Handlebars to the middleware configurator, make sure to do so before registering helpers via the koahub-handlebars proxy of the above functions, or just register your helpers directly via your Handlebars instance.

You can also access the current Koa context in your helper. If you want to have a helper that outputs the current URL, you could write a helper like the following and call it in any template as {{requestURL}}.

hbs.registerHelper('requestURL', function() {
var url = hbs.templateOptions.data.koa.request.url;
return url;
});
Registering Partials

The simple way to register partials is to stick them all in a directory, and pass the partialsPath option when generating the middleware. Say your views are in ./views, and your partials are in ./views/partials. Configuring the middleware via

app.use(hbs.middleware({
viewPath: __dirname + '/views',
partialsPath: __dirname + '/views/partials'
}));
will cause them to be automatically registered. Alternatively, you may register partials one at a time by calling hbs.registerPartial which proxies to the cached handlebars #registerPartial method.

Layouts

Passing defaultLayout with the a layout name will cause all templates to be inserted into the {{{body}}} expression of the layout. This might look like the following.

contact : {{email}}

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