編碼器。我需要在 go 模板中呈現嵌套的結構數據。我想知道是否可以在.gohtml模板文件中使用嵌套循環。這是我的.gohtml代碼：<!DOCTYPE html><html> <head> <meta charser="utf-8" /> <title>Go templates</title> </head> <body> <ul> {{range $city := .}} <li> name: {{$city.name}} hotels: <ul> {{range $hotel := $city.hotels}} <li> name: {{$hotel.name}} address: {{$hotel.address}} zip: {{$hotel.zip}} </li> {{end}} </ul> </li> {{end}} </ul> </body></html>這是main.go代碼：package mainimport ( "os" "text/template")var tpl *template.Templatefunc init() { tpl = template.Must(template.New("").ParseGlob("./*.gohtml"))}func main() { type hotel struct { name string address string city string zip int } type city struct { name string hotels []hotel } type region struct { cities []city } hotel1 := hotel{ "Lambda", "Street 19", "Some city", 65530, } hotel2 := hotel{ "Black Sea", "Street 21", "Some city", 65543, } hotel3 := hotel{ "Blue Sea", "Street 15", "Some city", 54400, } hotel4 := hotel{ "Yellow Submarine", "The Beatles Square", "Some city", 54401, } hotel5 := hotel{ "LolKek", "Cheburek", "Some city", 14213, } city1 := city{ "Some city", []hotel{hotel1, hotel2}, } city2 := city{ "Some city", []hotel{hotel3, hotel4}, } 為什么會被剪掉？
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TA貢獻1883條經驗 獲得超3個贊
您看不到任何錯誤，因為您沒有檢查錯誤，而是忽略了它們。
Template.ExecuteTemplate()返回錯誤，請檢查它：
if err := tpl.ExecuteTemplate(os.Stdout, "tpl.gohtml", someRegion); err != nil {
fmt.Println(err)
}
這將輸出：
template: :9:29: executing "" at <.>: range can't iterate over {[{Some city [{Lambda Street 19 Some city 65530} {Black Sea Street 21 Some city 65543}]} {Some city [{Blue Sea Street 15 Some city 54400} {Yellow Submarine The Beatles Square Some city 54401}]} {Some city [{LolKek Cheburek Some city 14213}]}]}
錯誤很明顯：你傳遞了一個結構來執行，然后你嘗試在它上面進行范圍。你不能。切片上的范圍：
{{range $city := .cities}}
這當然行不通：您必須導出結構字段才能在模板中訪問它。
type region struct {
Cities []city
}
在模板中：
{{range $city := .Cities}}
您還必須導出其他結構字段：
type hotel struct {
Name string
Address string
City string
Zip int
}
type city struct {
Name string
Hotels []hotel
}
在這些更改之后，它將工作并輸出（在Go Playground上嘗試）：
<!DOCTYPE html>
<html>
<head>
<meta charser="utf-8" />
<title>Go templates</title>
</head>
<body>
<ul>
<li>
name: Some city
hotels:
<ul>
<li>
name: Lambda
address: Street 19
zip: 65530
</li>
<li>
name: Black Sea
address: Street 21
zip: 65543
</li>
</ul>
</li>
<li>
name: Some city
hotels:
<ul>
<li>
name: Blue Sea
address: Street 15
zip: 54400
</li>
<li>
name: Yellow Submarine
address: The Beatles Square
zip: 54401
</li>
</ul>
</li>
<li>
name: Some city
hotels:
<ul>
<li>
name: LolKek
address: Cheburek
zip: 14213
</li>
</ul>
</li>
</ul>
</body>
</html>
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