Switch或if / elseif / else内部的golang HTML模板 [英] Switch or if/elseif/else inside golang HTML templates

问题描述

我有这个结构：

  const（
 paragraph_hypothesis = 1  paragraph_attachment = 1  paragraph_menu = 1  
）
 
类型段落结构{
键入int // paragraph_hypothesis或paragraph_attachment或paragraph_menu 
} 
  

我想在中显示段落类型
$ b

我发现的唯一解决方案是基于专用函数，如 isAttachment 测试在Go中键入并嵌套 {{if}} ：

  {{range .Paragraphs}} 
 {{if .IsAttachment}} 
  - 附件演示文稿代码 -  
 {{else}} {{if .IsMenu}} 
  - 菜单 -  
 {{else}} 
  - 默认代码 -  
 {{end}} {{end}} 
 {{end}} 
  

事实上，我有更多的类型，这使得它更怪，去代码使用 IsSomething 函数和模板与 {{end}} 。

干净的解决方案是什么？在go模板中是否存在 switch 或 if / elseif / else 解决方案？或者完全不同的方式来处理这些情况？

解决方案

模板无逻辑。他们不应该有这种逻辑。你可以拥有的最大逻辑是一堆 if if 。

在这种情况下，您应该这样做：

  {{if .IsAttachment}} 
  - 附件演示文稿代码 -  
 {{end}} 
 
 {{if .IsMenu}} 
 - 菜单 -  
 {{end}} 
 
 {{if .IsDefault}} 
  - 默认代码 -  
 {{end}} 
  

I have this struct :

const (
    paragraph_hypothesis = 1<<iota
    paragraph_attachment = 1<<iota
    paragraph_menu       = 1<<iota
)

type Paragraph struct {
    Type int // paragraph_hypothesis or paragraph_attachment or paragraph_menu
}

I want to display my paragraphs in a Type dependent way.

The only solution I found was based on dedicated functions like isAttachment testing the Type in Go and nested {{if}} :

{{range .Paragraphs}}
    {{if .IsAttachment}}
        -- attachement presentation code  --
    {{else}}{{if .IsMenu}}
        -- menu --
    {{else}}
        -- default code --
    {{end}}{{end}}
{{end}}

In fact I have more types, which makes it even weirder, cluttering both the Go code with IsSomething functions and the template with those {{end}}.

What's the clean solution ? Is there some switch or if/elseif/else solution in go templates ? Or a completely different way to handle these cases ?

解决方案

Templates are logic-less. They're not supposed to have this kind of logic. The maximum logic you can have is a bunch of if.

In such a case, you're supposed to do it like this:

{{if .IsAttachment}}
    -- attachment presentation code --
{{end}}

{{if .IsMenu}}
    -- menu --
{{end}}

{{if .IsDefault}}
    -- default code --
{{end}}

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