Golang : How to fix html/template : "somefile" is undefined error?

One of the most common mistakes when using html/template package ExecuteTemplate() function is forgetting to parse the HTML file first before executing the template.

Without parsing the HTML file, you will get the error message

html/template : "somefile or some html code" is undefined

html/template : "somefile or some html code" is undefined

when trying to run your program. Trouble is that this error message is not verbose enough to point out what exactly is causing the error.

To fix the error message, simply parse the file first either with



A good habit is always remember to count the number of HTML files that you need to execute and make sure the same number of HTML files are being parsed first.

Happy coding!

References :



  See also : Golang : How to use if, eq and print properly in html template

By Adam Ng(黃武俊)

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