CODEWITHSUNDEEP
gogo-templates
Casey Cao
Casey Cao

Reputation: 341

How to pass multiple variables to Go HTML template

I am new to golang. I would like to pass multiple variables to html. So I have a type like:

type Variables struct { 
    UserNames    []string  
    Checks       []string
}

pagevarible with passed the correct values

var PageVars Variables
    PageVars = Variables{
        UserNames: ulist,
        Checks: check,
    }
    log.Println("ulist",ulist)
    err = tpl.Execute(w, PageVars) //execute the template and pass it to index page
    if err != nil { // if there is an error
        log.Print("template executing error: ", err) //log it on terminal
    }

And I want to pass both UserNames and Checks to html template, something like:

{{range .UserNames .Checks}}
{{.UserNames}}: <input type="checkbox" name="email" value={{. UserNames}} {{.Checks}}/><br />
{{end}}

But it didn't work out. Can anyone correct my syntax? Thanks a lot.

Upvotes: 3

Views: 4914

Answers (2)

Thundercat
Thundercat

Reputation: 120941

Range with an index variable, use that index to get the check:

{{range $i, $user := .UserNames}}
{{$check := index $.Checks $i}}
{{$user}}: <input type="checkbox" name="email" value={{$user}} {{$check}}/><br />
{{end}}

Range sets the cursor . to successive values of the slice. Use $ to reference the Checks field in the argument to the template.

playground example

Upvotes: 5

superfell
superfell

Reputation: 19040

When you reference fields via . inside a range, its expecting that to be a field on the item being ranged, so in this case

{{range .UserNames}}
{{$check := .Checks}}

Its looking for a Checks field on the current instance in the Usernames list. If checks is separate to that (as it appears in your PageVars), then you can use the $ reference to the top level object, e.g.

{{range .UserNames}}
{{$check := $.Checks}}

You didn't post the code executing the template, but make sure you're checking the error returned from it.

Upvotes: 3

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