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Grender GoDoc Build Status

Grender is a package that provides functionality for easily rendering HTML templates and JSON or XML data to a HTTP response. It is based on github.com/unrolled/render with some subtle modifications when it comes to rendering HTML templates.

  • Templates can extend other templates using a template comment: {{/* extends "master.tmpl" */}}
  • Configure template files using a glob string: templates/*.tmpl
  • Support for partials as normal templates: {{ template "footer" .}}

Usage

Grender can be used with pretty much any web framework providing you can access the http.ResponseWriter from your handler. The rendering functions simply wraps Go's existing functionality for marshaling and rendering data.

  • HTML: Uses the html/template package to render HTML templates.
  • JSON: Uses the encoding/json package to marshal data into a JSON-encoded response.
  • XML: Uses the encoding/xml package to marshal data into an XML-encoded response.
  • Text: Passes the incoming string straight through to the http.ResponseWriter.
// main.go
package main

import (
    "net/http"
    "github.com/dannyvankooten/grender"  
)

func main() {
    r := grender.New(grender.Options{
        Charset: "ISO-8859-1",
        TemplatesGlob: "examples/*.tmpl",
    })
    mux := http.NewServeMux()

    // This will set the Content-Type header to "application/json; charset=ISO-8859-1".
    mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {
        r.JSON(w, http.StatusOK, map[string]string{"hello": "world"})
    })

    // This will set the Content-Type header to "text/html; charset=ISO-8859-1".
    mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {
        r.HTML(w, http.StatusOK, "hello.tmpl", "world")
    })

    http.ListenAndServe("127.0.0.1:3000", mux)
}

Options

Grender comes with a variety of configuration options. The defaults are listed below.

r := grender.New(grender.Options{
    Debug: false,       // If true, templates will be recompiled before each render call
    TemplatesGlob: "",  // Glob to your template files
    PartialsGlob: "",   // Glob to your patials or global templates
    Funcs: nil,         // Your template FuncMap
    Charset: "UTF-8",   // Charset to use for Content-Type header values
})

Extending another template

First, define your parent template like this.

// master.tmpl
<html>
  {{template "content" .}}
</html>

// Then, in a separate template file use a template comment to indicate that you want to extend the other template file.

// child.tmpl
{{/* extends "master.tmpl" */}}

{{define "content"}}Hello world!{{end}}

More examples

The grender_test.go file contains additional usage examples.

License

See LICENSE file.