英文:
How can I add FuncMaps to already parsed templates in golang
问题
我有一些模板，最初在应用程序启动时进行解析（显然是为了加快速度）。
var templates = template.New("template")
filepath.Walk("views", func(path string, info os.FileInfo, err error) error {
if strings.HasSuffix(path, ".html") {
templates.ParseFiles(path)
}
return nil
})
log.Println("Templates Parsed")
然后，我有一个函数映射，它们在自己的函数中添加（因为我需要请求对象，以便获取会话数据，如下所示）。
func View(w http.ResponseWriter, r *http.Request, tmplN string, data interface{}) {
tmpl := templates.Funcs(template.FuncMap{
"username": func() string {
session := Sesh(r)
username := ""
if session.Values["username"] != nil {
username = session.Values["username"].(string)
}
return username
},
"authenticated": func() bool {
session := Sesh(r)
authenticated := false
if session.Values["authenticated"] != nil {
authenticated = session.Values["authenticated"].(bool)
}
return authenticated
},
})
err := tmpl.ExecuteTemplate(w, tmplN, data)
if err != nil {
log.Println("Error " + err.Error())
}
}
但是，如果我不在模板解析之前调用Funcs函数，它似乎不起作用，例如，如果我尝试在我的register模板中使用如下所示：
{{ define "register" }}
{{ template "_header" .}}
{{ if authenticated }}
// 调用 FuncMap 函数
{{ end }}
<br/>
<br/>
<br/>
<div class="row align-center">
<div class="large-4 columns text-center">
<div id="RegistrationFormComponent"></div>
</div>
</div>
{{ template "_footer" .}}
{{ end }}
我会得到一个错误，提示“register”不存在，因为当它尝试解析时，函数authenticated会抛出一个错误。如果有关如何使其按预期工作的任何信息，将非常感谢。
英文:
I have my templates which are initially parsed on the app launch (obviously for speed reasons like this)
var templates = template.New("template")
filepath.Walk("views", func(path string, info os.FileInfo, err error) error {
if strings.HasSuffix(path, ".html") {
templates.ParseFiles(path)
}
return nil
})
log.Println("Templates Parsed")
Then I have my funcmaps which get added in their own function (because I need the request object so I can get their session data like so)
func View(w http.ResponseWriter, r *http.Request, tmplN string, data interface{}) {
tmpl := templates.Funcs(template.FuncMap{
"username": func() string {
session := Sesh(r)
username := ""
if session.Values["username"] != nil {
username = session.Values["username"].(string)
}
return username
},
"authenticated": func() bool {
session := Sesh(r)
authenticated := false
if session.Values["authenticated"] != nil {
authenticated = session.Values["authenticated"].(bool)
}
return authenticated
},
})
err := tmpl.ExecuteTemplate(w, tmplN, data)
if err != nil {
log.Println("Error " + err.Error())
}
}
But it seems like if I don't put the Funcs call before the parsing of the templates it doesn't work, e.g. if I try to use in my register template like so:
{{ define "register" }}
{{ template "_header" .}}
{{ if authenticated }}
// Call FuncMap function
{{ end }}
<br/>
<br/>
<br/>
<div class="row align-center">
<div class="large-4 columns text-center">
<div id="RegistrationFormComponent"></div>
</div>
</div>
{{ template "_footer" .}}
{{ end }}
I get an error that "register" does not exist because the function authenticated throws an error when it's trying to parse it. Any information on how I can get this to work as intended would be great thanks.
答案1
得分: 2
所以我找到了解决方法，但我会将这个答案留在这里，因为似乎没有地方回答，基本上我可以定义一个冗余的FuncMap，模仿我将在会话中使用的那个，并且只返回空白，然后我可以用我的view函数中的FuncMap（在问题帖子中可见）覆盖它们，像这样：
var templates = template.New("template").Funcs(template.FuncMap{
"authenticated": func() bool {
log.Println("Was I called?")
return false
},
"username": func() string {
return ""
},
})
英文:
So I figured it out, but I'll leave this answer here as it seems to not be answered anywhere, basically I can define a redundant FuncMap that mimics the one I will be using with the sessions, and just return them blank, I can then overwrite them with the FuncMap from my view function (visible in the question post) like this:
var templates = template.New("template").Funcs(template.FuncMap{
"authenticated": func() bool {
log.Println("Was I called?")
return false
},
"username": func() string {
return ""
},
})
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