Fill Dropdown and get Strings of Textfield of Website from Go

Getting Help
1

Hello Guys,

i currently try to do a Fileserver for my Project.
i have to fill a Drop-down-menu with a struct-array, get the name back of the chosen one of the box and have to read the strings inside a textfield of HTML from Go and i dont know how to do that. Pls send me some Code Example cause im new to this language and dont understand much.

Here is my Go-Code:

    //Klimakammer struct
type klimakammer struct {
	name        string
	Hersteller  string
	ip          string
	sollTemp    string
	istTemp     string
	sollFcht    string
	istFcht     string
	kammerstart bool
	kammerstop  bool
}

//Ct01 Klimakammern erstellen
var Ct01 = klimakammer{"ct01", "weiss", "10.0.62.22", "", "", "", "", false, true}

//Kammern - Fill Klimakammer Array
var Kammern = []klimakammer{
	Ct01,
}

func main() {

	fs := http.FileServer(http.Dir("./static"))
	http.Handle("/", fs)

	http.ListenAndServe(":8080", nil)

	http.HandleFunc("/getKammer", func(w http.ResponseWriter, r *http.Request) {
        //The Struct-Array kammern should be passed here to the DropDown
	})

}

And here is my Func.js Code: -> it’s an onClick Function when you start the program per button

    function fillChoiceBox() {
    var x = document.getElementById("Kammer"); // ID of DropDown
    //Loop for Struct Array
    var option = document.createElement("option");
    option.text = //Every single Chamber/kammer as option like Ct01.name
    x.add(option);
}
2

And that was my previous try, cause of the HandleFunc “/getKammer”

// $.ajax({
//     url: "http://localhost:8080/getKammer",
//     method: "GET",
//     function(data) {
//         var $dropdown = $("#Kammer");
//         $dropdown.append($("<option />").val(data).text(this.name));
//         $("#getKammer").prop('disabled', true);
//         $dropdown.append("<option>hallooo</option>")
//         document.getElementById("status").value = "es funktioniert yee";
//         },
//     });
3

Encode it to JSON:

package main

import (
	"encoding/json"
	"fmt"
)

type Klimakammer struct {
	Name        string `json:"name"`
	Hersteller  string `json:"hersteller"`
	Ip          string `json:"ip"`
	SollTemp    string `json:"sollTemp"`
	IstTemp     string `json:"istTemp"`
	SollFcht    string `json:"sollFcht"`
	IstFcht     string `json:"istFcht"`
	Kammerstart bool   `json:"kammerstart"`
	Kammerstop  bool   `json:"makkerstop"`
}

var Ct01 = Klimakammer{"ct01", "weiss", "10.0.62.22", "", "", "", "", false, true}

var Kammern = []Klimakammer{
	Ct01,
}

func main() {
	buff, _ := json.Marshal(&Kammern)

	fmt.Println(string(buff))
}

Output:

[{
	"name": "ct01",
	"hersteller": "weiss",
	"ip": "10.0.62.22",
	"sollTemp": "",
	"istTemp": "",
	"sollFcht": "",
	"istFcht": "",
	"kammerstart": false,
	"makkerstop": true
}]

see https://play.golang.org/p/w_v_Ujg2ZZd

Note that only exported fields can be serialized like this!

4

and how to get it into the ChoiceBox?

5

Write the JSON string to the w http.ResponseWriter in the handler func.

Client side JS is out of scope for this forum.

6

okay thanks

7

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