How Can I Render Different HTML Content Based on Type Values in Go Templates?

Switch Statements in Go HTML Templates

When dealing with Go structs that contain type information, it often becomes necessary to render different HTML content based on the type value. Traditionally, the solution involved nesting multiple {{if}} statements, creating cluttered and unwieldy templates.

Alternative Approach: Using {{else if}}

Go HTML templates provide the {{else if}} directive, which offers a cleaner and more efficient way to handle type-dependent rendering. This directive allows you to chain multiple conditions, enabling you to write concise and readable templates.

For example, consider the following Go struct:

const (
    paragraph_hypothesis = 1 << iota
    paragraph_attachment = 1 << iota
    paragraph_menu       = 1 << iota
)

type Paragraph struct {
    Type int // paragraph_hypothesis or paragraph_attachment or paragraph_menu
}

You can now render your paragraphs in a type-dependent way using the following template:

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

By chaining multiple {{else if}} directives, you can handle multiple type values without the need for dedicated functions or nested {{if}} statements. This approach keeps both your Go code and templates clean and organized.

Conclusion

Using {{else if}} in Go HTML templates offers a powerful and efficient way to handle type-dependent rendering. It allows you to create concise and readable templates without the clutter of nesting {{if}} statements and unnecessary functions.

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