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example_test.go
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example_test.go
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package htmlgo_test
import (
"context"
"fmt"
"net/http"
"net/http/httptest"
"os"
. "github.com/theplant/htmlgo"
)
/*
Create a simple div, Text will be escaped by html
*/
func ExampleTag_01simplediv() {
banner := "We write html in Go"
comp := Div(
Text("123<h1>"),
Textf("Hello, %s", banner),
Br(),
)
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <div>123<h1>Hello, We write html in Go
// <br>
// </div>
}
/*
Create a full html page
*/
func ExampleTag_02fullhtml() {
comp := HTML(
Head(
Meta().Charset("utf8"),
Title("My test page"),
),
Body(
Img("images/firefox-icon.png").Alt("My test image"),
),
)
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <!DOCTYPE html>
//
// <html>
// <head>
// <meta charset='utf8'>
//
// <title>My test page</title>
// </head>
//
// <body>
// <img src='images/firefox-icon.png' alt='My test image'>
// </body>
// </html>
}
/*
Use RawHTML and Component
*/
func ExampleTag_03rawhtmlandcomponent() {
userProfile := func(username string, avatarURL string) HTMLComponent {
return ComponentFunc(func(ctx context.Context) (r []byte, err error) {
return Div(
H1(username).Class("profileName"),
Img(avatarURL).Class("profileImage"),
RawHTML("<svg>complicated svg</svg>\n"),
).Class("userProfile").MarshalHTML(ctx)
})
}
comp := Ul(
Li(
userProfile("felix<h1>", "http://image.com/img1.png"),
),
Li(
userProfile("john", "http://image.com/img2.png"),
),
)
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <ul>
// <li>
// <div class='userProfile'>
// <h1 class='profileName'>felix<h1></h1>
//
// <img src='http://image.com/img1.png' class='profileImage'>
// <svg>complicated svg</svg>
// </div>
// </li>
//
// <li>
// <div class='userProfile'>
// <h1 class='profileName'>john</h1>
//
// <img src='http://image.com/img2.png' class='profileImage'>
// <svg>complicated svg</svg>
// </div>
// </li>
// </ul>
}
type MySelectBuilder struct {
options [][]string
selected string
}
func MySelect() *MySelectBuilder {
return &MySelectBuilder{}
}
func (b *MySelectBuilder) Options(opts [][]string) (r *MySelectBuilder) {
b.options = opts
return b
}
func (b *MySelectBuilder) Selected(selected string) (r *MySelectBuilder) {
b.selected = selected
return b
}
func (b *MySelectBuilder) MarshalHTML(ctx context.Context) (r []byte, err error) {
opts := []HTMLComponent{}
for _, op := range b.options {
var opt HTMLComponent
if op[0] == b.selected {
opt = Option(op[1]).Value(op[0]).Attr("selected", "true")
} else {
opt = Option(op[1]).Value(op[0])
}
opts = append(opts, opt)
}
return Select(opts...).MarshalHTML(ctx)
}
/*
More complicated customized component
*/
func ExampleTag_04newcomponentstyle() {
/*
Define MySelect as follows:
type MySelectBuilder struct {
options [][]string
selected string
}
func MySelect() *MySelectBuilder {
return &MySelectBuilder{}
}
func (b *MySelectBuilder) Options(opts [][]string) (r *MySelectBuilder) {
b.options = opts
return b
}
func (b *MySelectBuilder) Selected(selected string) (r *MySelectBuilder) {
b.selected = selected
return b
}
func (b *MySelectBuilder) MarshalHTML(ctx context.Context) (r []byte, err error) {
opts := []HTMLComponent{}
for _, op := range b.options {
var opt HTMLComponent
if op[0] == b.selected {
opt = Option(op[1]).Value(op[0]).Attr("selected", "true")
} else {
opt = Option(op[1]).Value(op[0])
}
opts = append(opts, opt)
}
return Select(opts...).MarshalHTML(ctx)
}
*/
comp := MySelect().Options([][]string{
{"1", "label 1"},
{"2", "label 2"},
{"3", "label 3"},
}).Selected("2")
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <select>
// <option value='1'>label 1</option>
//
// <option value='2' selected='true'>label 2</option>
//
// <option value='3'>label 3</option>
// </select>
}
/*
Write a little bit of JavaScript and stylesheet
*/
func ExampleTag_05javascript() {
comp := Div(
Button("Hello").Id("hello"),
Style(`
.container {
background-color: red;
}
`),
Script(`
var b = document.getElementById("hello")
b.onclick = function(e){
alert("Hello");
}
`),
).Class("container")
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <div class='container'>
// <button id='hello'>Hello</button>
//
// <style type='text/css'>
// .container {
// background-color: red;
// }
// </style>
//
// <script type='text/javascript'>
// var b = document.getElementById("hello")
// b.onclick = function(e){
// alert("Hello");
// }
// </script>
// </div>
}
/*
An example about how to integrate into http.Handler, and how to do layout, and how to use context.
*/
func ExampleTag_06httphandler() {
type User struct {
Name string
}
userStatus := func() HTMLComponent {
return ComponentFunc(func(ctx context.Context) (r []byte, err error) {
if currentUser, ok := ctx.Value("currentUser").(*User); ok {
return Div(
Text(currentUser.Name),
).Class("username").MarshalHTML(ctx)
}
return Div(Text("Login")).Class("login").MarshalHTML(ctx)
})
}
myHeader := func() HTMLComponent {
return Div(
Text("header"),
userStatus(),
).Class("header")
}
myFooter := func() HTMLComponent {
return Div(Text("footer")).Class("footer")
}
layout := func(in HTMLComponent) (out HTMLComponent) {
out = HTML(
Head(
Meta().Charset("utf8"),
),
Body(
myHeader(),
in,
myFooter(),
),
)
return
}
getLoginUserFromCookie := func(r *http.Request) *User {
return &User{Name: "felix"}
}
homeHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
user := getLoginUserFromCookie(r)
ctx := context.WithValue(context.TODO(), "currentUser", user)
root := Div(
Text("This is my home page"),
)
Fprint(w, layout(root), ctx)
})
w := httptest.NewRecorder()
r := httptest.NewRequest("GET", "/", nil)
homeHandler.ServeHTTP(w, r)
fmt.Println(w.Body.String())
//Output:
// <!DOCTYPE html>
//
// <html>
// <head>
// <meta charset='utf8'>
// </head>
//
// <body>
// <div class='header'>header
// <div class='username'>felix</div>
// </div>
//
// <div>This is my home page</div>
//
// <div class='footer'>footer</div>
// </body>
// </html>
}
/*
An example show how to set different type of attributes
*/
func ExampleTag_07MutipleTypeAttrs() {
type MoreData struct {
Name string
Count int
}
comp := Div(
Input("username").
Type("checkbox").
Attr("checked", true).
Attr("more-data", &MoreData{Name: "felix", Count: 100}).
Attr("max-length", 10),
Input("username2").
Type("checkbox").
Attr("checked", false),
)
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <div>
// <input name='username' type='checkbox' checked more-data='{"Name":"felix","Count":100}' max-length='10'>
//
// <input name='username2' type='checkbox'>
// </div>
}
/*
An example show how to set styles
*/
func ExampleTag_08styles() {
comp := Div().
StyleIf("background-color:red; border:1px solid red;", true).
StyleIf("color:blue", true)
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <div style='background-color:red; border:1px solid red; color:blue;'></div>
}
/*
An example to use If, `Iff` is for body to passed in as an func for the body depends on if condition not to be nil, `If` is for directly passed in HTMLComponent
*/
func ExampleTag_09iff() {
type Person struct {
Age int
}
var p *Person
name := "Leon"
comp := Div(
Iff(p != nil && p.Age > 18, func() HTMLComponent {
return Div().Text(name + ": Age > 18")
}).ElseIf(p == nil, func() HTMLComponent {
return Div().Text("No person named " + name)
}).Else(func() HTMLComponent {
return Div().Text(name + ":Age <= 18")
}),
)
Fprint(os.Stdout, comp, context.TODO())
//Output:
// <div>
// <div>No person named Leon</div>
// </div>
}