template Funcs and ParseFiles

[Keyur Shah]

I have multiple template files (base.html, header.html, footer.html, content.html, etc.) that I pass to ParseFiles and it works as expected. Bring in Funcs however and I have never been able to successfully call my funcs from the templates when using ParseFiles:

t, _ := template.New(noNameWorks).Funcs(f).ParseFiles("a.html", "b.html", "c.html")

I've tried various names - "a.html", "b.html", "c.html","a", "b", "c", (special mention: "mercy", "@F#$%*") - but it always errors out complaining about my func being not defined.

So then I resorted to reading the files myself and calling Parse and that works:

t := template.New("LiterallyAnyNameWorks").Funcs(f)

for _, tmpl := range[]string{"a.html","b.html","c.html"} {

b, _ := ioutil.ReadFile(tmpl)

t, _ = t.Parse(string(b))

}

What name can I give to my template to get ParseFiles to work and also what's the significance of giving a name to the template?

Thanks,

Keyur

[Kyle Lemons]

The name for New only matters if you directly Parse something into that template.  I usually use "".

template.New("").Funcs(f).ParseFiles("a.html", "b.html", "c.html")

should work, and if not, paste some code and the actual error message you're getting.

 

Thanks,

Keyur

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[Keyur Shah]

That didn't work. I get this error:

html/template: "" is an incomplete or empty template

Here's the code:

t, _ := template.New("").Funcs(f).ParseFiles(templatesFiles...)

t.Execute(w, data)

Reading files and parsing the file content works with "" as the template name. Here's the code:

t := template.New("").Funcs(f)

for _, tmpl := range templateFiles {

b, _ := ioutil.ReadFile(tmpl)

t, _ = t.Parse(string(b))

}

t.Execute(w, data)

Thanks,

Keyur

[Carlos Castillo]

Use ExecuteTemplate with a template name, not Execute. Execute is meant for when you parse a single template, it has some logic for when there are multiple templates, but it's not well documented, and using ParseFiles() produces a different template set that Execute handles differently than parsing one at a time.

It's almost always preferred when you have a bunch of templates in a single template "Set" to explicitly choose the one you want to render with ExecuteTemplate.

[DeedleFake]

This drove me nuts for quite a while, until I realized that there's absolutely no need to call template.New() at all; rather than defining a blank template with a random name, just use new(template.Template). This is a contrived example, but if you replace the

.New("example").Parse(tmpl)

at the end of the nasty method chain with

.ParseFiles(files...)

then I think that's what you're looking for. That way you can associate the FuncMap with the templates before parsing them.

[Keyur Shah]

I tried both and neither worked.

Even after replacing Execute with ExecuteTemplate I get the same error: html/template: "anyname" is an incomplete template

DeedleFake - your example used text/template. If you change the import to html/template it throws a nil pointer:

http://play.golang.org/p/DipOIyHVSL

== Keyur

[Kyle Lemons]

On Wed, Aug 7, 2013 at 1:44 PM, Keyur Shah <key...@gmail.com> wrote:

I tried both and neither worked.

Even after replacing Execute with ExecuteTemplate I get the same error: html/template: "anyname" is an incomplete template

Did you have a file named "anyname"?  You have to ExecuteTemplate with the name of one of the files or the name of one of the templates within one of the files.

[Keyur Shah]

Thank you. Got it to work based on your suggestion.

BTW - it only worked with the name of the first file. Any other name and it didn't yield any output.

Here's the relevant working code snippet:

tname := filepath.Base(templatesFiles[0])

t, _ := template.New(tname).Funcs(f).ParseFiles(templateFiles...)

t.ExecuteTemplate(w, tname, data)

Thanks,

Keyur

[Kyle Lemons]

Don't ignore your errors.

[Keyur Shah]

Of course I don't. I do in forum posts to reduce noise.

[Kyle Lemons]

That makes it impossible for us to know that you are checking your errors, then.  If you get no output from a template invocation, it either means that there was nothing to write or you got an error before anything was written.