How to Display Data in Go HTML Templates Based on Struct Field Type?

Switch or if/elseif/else within Golang HTML Templates

Problem:

Displaying data in a template based on the type of a Go struct field. The current solution involves nesting multiple {{if}} statements or creating separate functions to test the type.

Solution:

Switch Statement:

{{range .Paragraphs}}
    {{switch .Type}}
    {{case paragraph_hypothesis}}:
        -- hypothesis presentation code  --
    {{case paragraph_attachment}}:
        -- attachment presentation code  --
    {{case paragraph_menu}}:
        -- menu --
    {{default}}:
        -- default code --
    {{end}}
{{end}}

if/elseif/else Statement:

{{range .Paragraphs}}
    {{if .IsAttachment}}
        -- attachment presentation code  --
    {{elseif .IsMenu}}
        -- menu --
    {{else}}
        -- default code --
    {{end}}
{{end}}

In this example, the additional {{else if .IsMenu}} checks for the paragraph_menu type after checking for paragraph_attachment.

Use of Functions:

In cases where the presentation logic is complex, it's advisable to define separate functions in the Go code. For example, you could define functions like GetHypothesisHTML() and GetAttachmentHTML(), then call them from the template:

{{range .Paragraphs}}
    {{if .IsHypothesis}}
        {{GetHypothesisHTML .}}
    {{elseif .IsAttachment}}
        {{GetAttachmentHTML .}}
    {{elseif .IsMenu}}
        -- menu --
    {{else}}
        -- default code --
    {{end}}
{{end}}

By leveraging switch statements, if/elseif/else statements, or dedicated functions, you can display data in your template based on the type of a Go struct field in a clean and concise manner.

The above is the detailed content of How to Display Data in Go HTML Templates Based on Struct Field Type?. For more information, please follow other related articles on the PHP Chinese website!