如何在Go模板中解析超出范围的变量?

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英文:

How do I parse variables outside the range in Go templates?

问题

我有两个如下的结构体,并且我需要使用[templates][1]包在模板上渲染数据。我得到了以下错误信息:

<.Email>: Email is not a field of struct type Notes.

问题似乎是只有范围结构体的字段在范围循环内可用,所以我想知道如何从范围结构体外部导入字段(例如Email字符串)。

这种行为相当出乎意料。

type notes struct{
    Note string
    sf string
}

type uis struct{
    notes []Note
    Email string
}

var ui uis

HTML

{{range .notes}}
    {{.Email}} {{.sf}}
{{end}}

Email {{.Email}}

我已经查看了godocs,但它们似乎没有什么用处。
[1]: http://golang.org/pkg/text/template/

英文:

I have two structs as below and I need to render the data on a template using the [templates][1] pack. I get this error

<.Email>: Email is not a field of struct type Notes.

The issue seems to be that only fields of the range struct seem to be available within the range loop so I'm wondering how I can import fields from outside the range struct (e.g. the Email string).

The behavior is quite unexpected.

type notes struct{
    Note string
    sf string
}

type uis struct{
    notes []Note
    Email string
}

var ui uis

HTML

{{range .notes}}
 	{{.Email}} {{.sf}}
    {{end}}
 
Email {{.Email}}

I've checked the godocs but they seem quite useless.
[1]: http://golang.org/pkg/text/template/

答案1

得分: 37

从文档中可以得知:

当执行开始时,$ 被设置为传递给 Execute 的数据参数,也就是 dot 的初始值。

因此,你可以这样使用:

{{range .notes}}
    {{$.Email}} {{.sf}}
{{end}}

Email {{.Email}}

(注意 range 内部的美元符号)

Playground 链接:http://play.golang.org/p/XiQFcGJEyR

附注:下次请尽量提供正确的代码和更好的解释。目前来看,我“认为”我已经回答了这个问题,但我不能确定。你的代码无法编译 - 例如,类型名称错误/与成员混合,并且你有未导出的字段,因此无法通过模板访问它们。

英文:

From the documentation:

> When execution begins, $ is set to the data argument passed to Execute, that is, to the starting value of dot.

Therefore, you can use this:

{{range .notes}}
    {{$.Email}} {{.sf}}
{{end}}

Email {{.Email}}

(Note the dollar sign inside the range)

Playground link: http://play.golang.org/p/XiQFcGJEyR

Side note: Next time try to provide proper code and a better explanation. As it stands, I think I've answered this, but I cannot be sure. Your code doesn't compile - for example, type names are wrong/mixed with members and you have unexported fields so they cannot be accessed by the templates.

huangapple
  • 本文由 发表于 2014年7月21日 19:05:10
  • 转载请务必保留本文链接:https://go.coder-hub.com/24863585.html
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