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Go Json into struct / struct into HTML – Getting Assist


I bought following struct:

	kind Knowledge struct {
			Data1         int
			Data2		int
			ImpData     []struct {
				Title          string
				ID               string
				TextS string
			}
		}
		

I unmarshall the jsoncode into var o

		var o Knowledge
		err = json.Unmarshal(output, &o)
		if err != nil {
			panic(err.Error())
		}

I get the info with a for loop

		for i := 0; i < len(o.ImpData); i++ {
				fmt.Printf(" Check: %+v", o.ImpData[i].Title)
				}

Until this level all the pieces works, however i dont know how you can excatly execute the Template with the appropriate parameters and information.

	tmpl, _ := template.ParseFiles("index.html")
	tmpl.Execute(w, o)
	
	
HTML:
<p model="coloration: black;"> {{ vary .ImpData }}  {{ . }}</p>

Strive switching your template to one thing like this:

{{ vary .ImpData }}
    <p model="coloration: black;">{{ .Title }}</p>
{{ finish }}

Right here’s a whole contrived instance to get you going:

package deal important

import (
	"html/template"
	"os"
	"strconv"
)

kind ImpData struct {
	Title string
	ID    string
	TextS string
}

kind Knowledge struct {
	Data1   int
	Data2   int
	ImpData []ImpData
}

var htmlTmpl = `{{ vary .ImpData }}
    <p model="coloration: black;">{{ .Title }}</p>
{{ finish }}`

func important() {
	// Ignoring errors for brevity. Do not actually do that.
	t := template.Should(template.New("take a look at").Parse(htmlTmpl))
	dat := Knowledge{}
	for i := 0; i < 10; i++ {
		dat.ImpData = append(dat.ImpData, ImpData{Title: "take a look at", ID: strconv.Itoa(i), TextS: "take a look at"})
	}
	t.Execute(os.Stdout, dat)
}

You possibly can run it on the go playground:



1 Like

Thanks on your reply and assist.

Why you declare 2 structs? This closely confuses me as i’ve a struct in struct.
in my case the unmarshalled json is in var o.
And why? dat.ImpData I’ve o.Impdata[i].Title, o.Impdata[i].TextS and many others as my output and this must be rendered within the html template.

My mind has a stack overflow by understanding this :smiley:

Knowledge incorporates a slice of kind ImpData as an alternative of an nameless struct. I simply did it that means as a result of while you declare your baby struct as an nameless struct like so:

kind Knowledge struct {
	Data1   int
	Data2   int
	ImpData []struct { // What kind is that this?
		Title string
		ID    string
		TextS string
	}
}

… it makes the initialization of my contrived information extra verbose:

for i := 0; i < 10; i++ {
	dat.ImpData = append(dat.ImpData, struct {
		Title string
		ID    string
		TextS string
	}{"take a look at", strconv.Itoa(i), "take a look at"})
}

Nevertheless it’s in impact the identical. You possibly can run it right here with the very same Knowledge struct as in your instance:

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