douweng3383
2015-04-14 11:50
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如何在golang模板中使用除法?

How can I use division in a golang template. I need to divide Id by 2.

For example

{{if .Id/2}}
HEY, I CAN DO IT!
{{else}}
WHY???
{{end}}

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如何在golang模板中使用除法。 我需要将 Id 除以2。

例如

  {{if .Id / 2}  } 
HEY,我可以做到!
 {{else}} 
WHY ??? 
 {{end}} 
   
 
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  • dshakcsq64956 2015-04-14 12:09
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    The package text/template (and subsequently html/template) can provide the functionality by defining division as a function using Template.Funcs:

    func (t *Template) Funcs(funcMap FuncMap) *Template
    

    In your case, a FuncMap with a divide function could look something like this:

    fm := template.FuncMap{"divide": func(a, b int) int {
        return a / b
    }}
    

    Full example (but without me trying to understand what you mean with if a/2):

    package main
    
    import (
        "os"
        "text/template"
    )
    
    func main() {
        fm := template.FuncMap{"divide": func(a, b int) int {
            return a / b
        }}
    
        tmplTxt := `{{divide . 2}}`
    
        // Create a template, add the function map, and parse the text.
        tmpl, err := template.New("foo").Funcs(fm).Parse(tmplTxt)
        if err != nil {
            panic(err)
        }
    
        // Run the template to verify the output.
        err = tmpl.Execute(os.Stdout, 10)
        if err != nil {
            panic(err)
        }
    }
    

    Output:

    5

    Playground: http://play.golang.org/p/VOhTYbdj6P

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