# View
Iris supports 8 template engines out-of-the-box, developers can still use any external golang template engine,
as `Context.ResponseWriter()` is an `io.Writer`.
All template engines share a common API i.e.
Parse using embedded assets, Layouts and Party-specific layout, Template Funcs, Partial Render and more.
| # | Name | Parser |
|:---|:-----------|----------|
| 1 | HTML | [html/template](https://pkg.go.dev/html/template) |
| 2 | Blocks | [kataras/blocks](https://github.com/kataras/blocks) |
| 3 | Django | [flosch/pongo2](https://github.com/flosch/pongo2) |
| 4 | Pug | [Joker/jade](https://github.com/Joker/jade) |
| 5 | Handlebars | [aymerick/raymond](https://github.com/aymerick/raymond) |
| 6 | Amber | [eknkc/amber](https://github.com/eknkc/amber) |
| 7 | Jet | [CloudyKit/jet](https://github.com/CloudyKit/jet) |
| 8 | Ace | [yosssi/ace](https://github.com/yosssi/ace) |
[List of Examples](https://github.com/kataras/iris/tree/master/_examples/view).
You can serve [quicktemplate](https://github.com/valyala/quicktemplate) files too, simply by using the `Context.ResponseWriter`, take a look at the [iris/_examples/view/quicktemplate](https://github.com/kataras/iris/tree/master/_examples/view/quicktemplate) example.
## Overview
```go
// file: main.go
package main
import "github.com/kataras/iris/v12"
func main() {
app := iris.New()
// Load all templates from the "./views" folder
// where extension is ".html" and parse them
// using the standard `html/template` package.
app.RegisterView(iris.HTML("./views", ".html"))
// Method: GET
// Resource: http://localhost:8080
app.Get("/", func(ctx iris.Context) {
// Bind: {{.message}} with "Hello world!"
ctx.ViewData("message", "Hello world!")
// Render template file: ./views/hello.html
ctx.View("hello.html")
})
// Method: GET
// Resource: http://localhost:8080/user/42
app.Get("/user/{id:int64}", func(ctx iris.Context) {
userID, _ := ctx.Params().GetInt64("id")
ctx.Writef("User ID: %d", userID)
})
// Start the server using a network address.
app.Listen(":8080")
}
```
```html
<!-- file: ./views/hello.html -->
<html>
<head>
<title>Hello Page</title>
</head>
<body>
<h1>{{.message}}</h1>
</body>
</html>
```
## Template functions
```go
package main
import "github.com/kataras/iris/v12"
func main() {
app := iris.New()
tmpl := iris.HTML("./templates", ".html")
// builtin template funcs are:
//
// - {{ urlpath "mynamedroute" "pathParameter_ifneeded" }}
// - {{ render "header.html" }}
// - {{ render_r "header.html" }} // partial relative path to current page
// - {{ yield }}
// - {{ current }}
// register a custom template func.
tmpl.AddFunc("greet", func(s string) string {
return "Greetings " + s + "!"
})
// register the view engine to the views, this will load the templates.
app.RegisterView(tmpl)
app.Get("/", hi)
// http://localhost:8080
app.Listen(":8080")
}
func hi(ctx iris.Context) {
// render the template file "./templates/hi.html"
ctx.View("hi.html")
}
```
```html
<!-- file: ./templates/hi.html -->
<b>{{greet "kataras"}}</b> <!-- will be rendered as: <b>Greetings kataras!</b> -->
```
## Embedded
View engine supports bundled(https://github.com/go-bindata/go-bindata) template files too. Latest
`go-bindata` release gives you a compatible `http.FileSystem` that can be provided as the first argument of a view engine's initialization, e.g. `HTML(AssetFile(), ".html")`.
```sh
$ go get -u github.com/go-bindata/go-bindata/...
# OR: go get -u github.com/go-bindata/go-bindata/v3/go-bindata
# to save it to your go.mod file
$ go-bindata -fs -prefix "templates" ./templates/...
$ go run .
```
Example Code:
```go
package main
import "github.com/kataras/iris/v12"
func main() {
app := iris.New()
app.RegisterView(iris.HTML(AssetFile(), ".html"))
app.Get("/", hi)
// http://localhost:8080
app.Listen(":8080")
}
type page struct {
Title, Name string
}
func hi(ctx iris.Context) {
// {{.Page.Title}} and {{Page.Name}}
ctx.ViewData("Page", page{Title: "Hi Page", Name: "iris"})
ctx.View("hi.html")
}
```
A real example can be found here: https://github.com/kataras/iris/tree/master/_examples/view/embedding-templates-into-app.
## Reload
Enable auto-reloading of templates on each request. Useful while developers are in dev mode
as they no neeed to restart their app on every template edit.
Example code:
```go
pugEngine := iris.Pug("./templates", ".jade")
pugEngine.Reload(true) // <--- set to true to re-build the templates on each request.
app.RegisterView(pugEngine)
```