How to set web template variable to a dynamic html&golang code?

Question

I have two web page on golang and I want to embed this pages codes to {{.content}} variable (defined in templates/main.html) being with dynamic according to the coming requests.

For example if the guest enter the userregister page I want to the {{.content}} variable will be userregister codes otherwise userprofile codes.

templates/userregister.html page codes;

{{ define "userregister" }}
   ...
   {{.specialmessage}}
   ...
{{ end }}

templates/userprofile.html page codes;

{{ define "userprofile" }}
   ...
   {{.specialmessage}}
   ...
{{ end }}

templates/main.html;

{{ define "main" }}
<!DOCTYPE html>
<html lang="tr">
    {{ template "head" . }}
    <body>
        <div class="container-fluid">
            {{ template "header" . }}
            <div class="row">
                <nav class="col-12 col-md-2 p-0">
                    {{ template "leftmenu" . }}
                </nav>
                <div class="container-fluid col-12 col-md-10">


                    {{.content}}


                </div>
            </div>
            {{ template "footer" . }}
        </div>
    </body>
</html>
{{ end }}

The userregister page controller;

func PgUserRegister(c *gin.Context) {
    c.HTML(http.StatusOK,"main", gin.H{
        "pgETitle": "User Register page",
        "specialmessage": "You are on the userregister page.",

        "content": template.ParseFiles("userregister.html"),
    })
}

The userprofile page controller;

func PgUserProfile(c *gin.Context) {
    c.HTML(http.StatusOK,"main", gin.H{
        "pgETitle": "User Profile",
        "specialmessage": "You are on the userprofile page.",

        "content": template.ParseFiles("userprofile.html"),
    })
}

mkopriva · Accepted Answer · 2019-04-28 16:26:33Z

2

Parse all templates when starting the router.

router.LoadHTMLFiles("templates/main.html", "templates/userregister.html", "templates/userprofile.html")

Then in your handler add to the gin.H{ ... } expression a boolean variable, e.g. "isLoggedIn", and then in your main template use an if-else action together with the template action.

{{ if .isLoggedIn }}
    {{ template "userprofile" . }}
{{ else }}
    {{ template "userregister" . }}
{{ end }}

answered Apr 28, 2019 at 16:26

mkopriva

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5 Comments

Hakan Over a year ago

Thanks, @mkopriva I have a lot of pages for this situation how can I make like it {{ template .pgVariable . }} #### pgVariable is the string variable contains page name?

mkopriva Over a year ago

That's not possible, if you look at the documentation on actions linked above you'll see that the argument must be a literal string containing the name of a template.

mkopriva Over a year ago

@Hakan do you have a lot of templates where you need to switch between these two specific templates? Or do you have a lot of templates where you need to switch between different templates, not just userprofile and userregister?

Hakan Over a year ago

Actually; I have a lot of template pages but I posted my question being two template pages to simplify the problem. I have about 10 different pages (I am not sure yet at now), Do I have to control the template pages with if statement one by one?

mkopriva Over a year ago

Maybe rethink how you structure those templates, instead of attempting to render everything from main.html, each template would have a template action on top and bottom to render that content that is shared by all of them.

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