2020-09-13 13:50:19 -07:00
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# gomponents
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2020-09-14 01:51:29 -07:00
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[![GoDoc](https://godoc.org/github.com/maragudk/gomponents?status.svg)](https://godoc.org/github.com/maragudk/gomponents)
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2020-09-18 05:05:53 -07:00
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[![codecov](https://codecov.io/gh/maragudk/gomponents/branch/master/graph/badge.svg)](https://codecov.io/gh/maragudk/gomponents)
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2020-09-14 01:51:29 -07:00
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2020-11-16 03:38:24 -08:00
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gomponents are declarative view components in Go, that can render to HTML5.
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gomponents aims to make it easy to build HTML5 pages of reusable components,
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2020-09-13 13:50:19 -07:00
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without the use of a template language. Think server-side-rendered React,
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but without the virtual DOM and diffing.
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2020-12-10 04:00:23 -08:00
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The implementation is very usable, but the API may change until version 1 is reached.
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2020-09-21 07:30:29 -07:00
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2020-09-25 03:32:50 -07:00
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Check out the blog post [gomponents: declarative view components in Go](https://www.maragu.dk/blog/gomponents-declarative-view-components-in-go/)
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for background.
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2020-11-02 02:05:23 -08:00
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## Features
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- Build reusable view components
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- Write declarative HTML5 in Go without all the strings, so you get
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- Type safety
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- Auto-completion
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- Nice formatting with `gofmt`
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- Simple API that's easy to learn and use (you know most already if you know HTML)
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- No external dependencies
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2020-09-21 07:30:29 -07:00
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## Usage
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Get the library using `go get`:
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```shell script
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go get -u github.com/maragudk/gomponents
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```
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2020-12-10 04:00:23 -08:00
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The preferred way to use gomponents is with so-called dot-imports (note the dot before the `gomponents/html` import),
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to give you that smooth, native HTML feel:
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2020-09-21 07:30:29 -07:00
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```go
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2020-09-23 13:05:59 -07:00
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package main
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import (
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2020-09-23 13:05:59 -07:00
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"net/http"
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2020-09-21 07:30:29 -07:00
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2020-09-23 13:05:59 -07:00
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g "github.com/maragudk/gomponents"
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c "github.com/maragudk/gomponents/components"
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. "github.com/maragudk/gomponents/html"
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)
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func main() {
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_ = http.ListenAndServe("localhost:8080", http.HandlerFunc(handler))
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}
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2020-12-10 04:00:23 -08:00
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func handler(w http.ResponseWriter, r *http.Request) {
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_ = Page("Hi!", r.URL.Path).Render(w)
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}
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2020-12-10 04:00:23 -08:00
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func Page(title, currentPath string) g.Node {
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return Doctype(
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HTML(
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Lang("en"),
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Head(
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TitleEl(title),
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StyleEl(Type("text/css"), g.Raw(".is-active{ font-weight: bold }")),
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),
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Body(
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Navbar(currentPath),
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H1(title),
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P(g.Textf("Welcome to the page at %v.", currentPath)),
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),
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),
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)
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}
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func Navbar(currentPath string) g.Node {
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return Nav(
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NavbarLink("/", "Home", currentPath),
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NavbarLink("/about", "About", currentPath),
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)
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}
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func NavbarLink(href, name, currentPath string) g.Node {
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Simplify available elements (#55)
`a`, `form`, `img`, `input`, `label`, `option`, `progress`, `select`, and `textarea` are now just regular elements (without helper parameters), because:
- Sometimes the use case doesn't fit (`a` as anchor without href, for example)
- There's no reason these are special among the others, so streamlining them makes sense
Also added new attributes `action`, `alt`, `for`, `method` that I had somehow missed.
2020-12-10 05:20:33 -08:00
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return A(Href(href), c.Classes{"is-active": currentPath == href}, g.Text(name))
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}
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```
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2020-12-10 04:00:23 -08:00
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Some people don't like dot-imports, and luckily it's completely optional.
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If you don't like dot-imports, just use regular imports.
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You could also use the provided HTML5 document template to simplify your code a bit:
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2020-10-29 04:03:43 -07:00
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```go
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package main
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import (
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"net/http"
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g "github.com/maragudk/gomponents"
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c "github.com/maragudk/gomponents/components"
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. "github.com/maragudk/gomponents/html"
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)
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func main() {
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_ = http.ListenAndServe("localhost:8080", http.HandlerFunc(handler))
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}
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2020-12-10 04:00:23 -08:00
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func handler(w http.ResponseWriter, r *http.Request) {
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_ = Page("Hi!", r.URL.Path).Render(w)
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}
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func Page(title, currentPath string) g.Node {
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return c.HTML5(c.HTML5Props{
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Title: title,
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Language: "en",
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Head: []g.Node{
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StyleEl(Type("text/css"), g.Raw(".is-active{ font-weight: bold }")),
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},
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Body: []g.Node{
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Navbar(currentPath),
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H1(title),
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P(g.Textf("Welcome to the page at %v.", currentPath)),
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},
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})
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}
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2020-12-10 04:00:23 -08:00
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func Navbar(currentPath string) g.Node {
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return Nav(
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NavbarLink("/", "Home", currentPath),
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NavbarLink("/about", "About", currentPath),
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)
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}
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func NavbarLink(href, name, currentPath string) g.Node {
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Simplify available elements (#55)
`a`, `form`, `img`, `input`, `label`, `option`, `progress`, `select`, and `textarea` are now just regular elements (without helper parameters), because:
- Sometimes the use case doesn't fit (`a` as anchor without href, for example)
- There's no reason these are special among the others, so streamlining them makes sense
Also added new attributes `action`, `alt`, `for`, `method` that I had somehow missed.
2020-12-10 05:20:33 -08:00
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return A(Href(href), c.Classes{"is-active": currentPath == href}, g.Text(name))
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}
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2020-10-29 04:03:43 -07:00
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```
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2020-09-21 07:30:29 -07:00
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For more complete examples, see [the examples directory](examples/).
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2020-12-10 04:00:23 -08:00
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### What's up with the specially named elements and attributes?
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2020-12-22 02:46:49 -08:00
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Unfortunately, there are four main name clashes in HTML elements and attributes, so they need an `El` or `Attr` suffix,
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respectively, to be able to co-exist in the same package in Go:
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2020-12-22 02:46:49 -08:00
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- `data` (`DataEl`/`DataAttr`)
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- `form` (`FormEl`/`FormAttr`)
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- `style` (`StyleEl`/`StyleAttr`)
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- `title` (`TitleEl`/`TitleAttr`)
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