golang template - how to render templates?

问题:

One layout template with three children templates.

layout.html

        {{template "tags"}}      {{template "content"}}      {{template "comment"}}     

tags.html

{{define "tags"}} 
     {{.Name}} 
 {{end}}   
content.html
  
{{define "content"}} 
    
{{.Title}}
    
{{.Content}}
 
 {{end}} 
  
comment.html
  
{{define "tags"}} 
     {{.Note}} 
 {{end}} 
  
gocode
  
type Tags struct {    Id int    Name string }  type Content struct {    Id int    Title string    Content string }  type Comment struct {    Id int    Note string }   func main() {     tags := &Tags{"Id":1, "Name":"golang"}     Content := &Content{"Id":9, "Title":"Hello", "Content":"World!"}     Comment := &Comment{"Id":2, "Note":"Good Day!"} } 
  
I am confused that how to render each children template and combine the result to layout output.
  
Thanks.
     
回答1:
 
As always, the doc is a good place to start.
  
I wrote a working example on the playground
  
To explain a bit:
  
You don't need strings in struct literals: &Tags{Id: 1}, not &Tags{"Id":1}
 
You can only pass a single object to your template to execute, which will dispatch objects to each subtemplate as you require in the {{template }} instruction. I used a ad-hoc Page struct, but a map[string]interface{} would do if you prefer.
 
You need to parse each template (I used strings in the Playground, but ParseFiles would do if you have your html files already)
 
I used os.Stdout to execute it, but you should obviously replace that by the corresponding ResponseWriter
 
And the whole code:
  
package main  import "fmt" import "html/template" import "os"  var page = `        {{template "tags" .Tags}}      {{template "content" .Content}}      {{template "comment" .Comment}}    `  var tags = `{{define "tags"}} 
     {{.Name}} 
 {{end}}`  var content = `{{define "content"}} 
    
{{.Title}}
    
{{.Content}}
 
 {{end}}`  var comment = `{{define "comment"}} 
     {{.Note}} 
 {{end}}`  type Tags struct {    Id int    Name string }  type Content struct {    Id int    Title string    Content string }  type Comment struct {    Id int    Note string }  type Page struct {     Tags *Tags     Content *Content     Comment *Comment }  func main() {     pagedata := &Page{Tags:&Tags{Id:1, Name:"golang"},                       Content: &Content{Id:9, Title:"Hello", Content:"World!"},                       Comment: &Comment{Id:2, Note:"Good Day!"}}     tmpl := template.New("page")     var err error     if tmpl, err = tmpl.Parse(page); err != nil {         fmt.Println(err)     }     if tmpl, err = tmpl.Parse(tags); err != nil {         fmt.Println(err)     }     if tmpl, err = tmpl.Parse(comment); err != nil {         fmt.Println(err)     }     if tmpl, err = tmpl.Parse(content); err != nil {         fmt.Println(err)     }     tmpl.Execute(os.Stdout, pagedata) }      


 
文章来源: golang template - how to render templates?