DEMO CRUD App – Fyne Golang GUI Tutorial 56

Fyne CRUD app – Fyne Golang GUI Tutorial 56

Want to create full crud app in Fyne & golang watch this tutorial.

 

Source Code

[sourcecode language=”go”] package main

import (
"encoding/json"
"fmt"
"io/ioutil"
"os"

"fyne.io/fyne/v2"
"fyne.io/fyne/v2/app"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/widget"
)

func main() {
// reading data from file
res, _ := ioutil.ReadFile("myfilename.txt")
// creating struct for my data
type Student struct {
Name string
Phone string
}
// slice/array to store all data
var mydata []Student
// parse json data
json.Unmarshal(res, &mydata)
a := app.New()
w := a.NewWindow("Student Record List")
w.Resize(fyne.NewSize(400, 400))
list := widget.NewList(
func() int { return len(mydata) },
func() fyne.CanvasObject {
return widget.NewLabel("My list item widget")
},
func(lii widget.ListItemID, co fyne.CanvasObject) {
co.(*widget.Label).SetText(mydata[lii].Name)
},
)
label1 := widget.NewLabel("…")
label2 := widget.NewLabel("…")
list.OnSelected = func(id widget.ListItemID) {
label1.Text = mydata[id].Name
label1.TextStyle = fyne.TextStyle{Bold: true}
label2.Text = mydata[id].Phone
// label2.TextStyle = fyne.TextStyle{Bold: true}
label1.Refresh()
label2.Refresh()
}
e_name := widget.NewEntry()
e_name.SetPlaceHolder("Enter name …")
e_phone := widget.NewEntry()
e_phone.SetPlaceHolder("Enter phone …")
e_submit := widget.NewButton("Submit", func() {
if e_name.Text != "" && e_phone.Text != "" {
obj1 := &Student{
Name: e_name.Text,
Phone: e_phone.Text,
}
mydata = append(mydata, *obj1)
b, _ := json.MarshalIndent(mydata, "", " ")
os.WriteFile("myfilename.txt", b, 0644)
e_name.Text = ""
e_phone.Text = ""
e_name.Refresh()
e_phone.Refresh()
} else {
label1.Text = "Incorrect data"
label2.Text = ""
label2.Refresh()
label1.Refresh()
}
list.Refresh()
})
e_del := widget.NewButton("DELETE", func() {
var mydata2 []Student
for _, a := range mydata {
if a.Name != label1.Text {
mydata2 = append(mydata2, a)
fmt.Println(a)
}
}
mydata = mydata2
b, _ := json.MarshalIndent(mydata2, "", " ")
os.WriteFile("myfilename.txt", b, 0644)
e_name.Text = ""
e_phone.Text = ""
e_name.Refresh()
e_phone.Refresh()
list.Refresh()
})
e_update := widget.NewButton("Update", func() {
if e_name.Text != "" && e_phone.Text != "" {
var mydata2 []Student
for _, a := range mydata {
if a.Name != label1.Text {
mydata2 = append(mydata2, a)
fmt.Println(a)
} else {
obj1 := &Student{
Name: e_name.Text,
Phone: e_phone.Text,
}
mydata2 = append(mydata2, *obj1)
fmt.Println(a)
}
}
mydata = mydata2
b, _ := json.MarshalIndent(mydata2, "", " ")
os.WriteFile("myfilename.txt", b, 0644)
e_name.Text = ""
e_phone.Text = ""
e_name.Refresh()
e_phone.Refresh()
list.Refresh()
} else {
label1.Text = "Incorrect data"
label2.Text = ""
label2.Refresh()
label1.Refresh()
}
list.Refresh()
})
c := container.NewVBox(label1, label2,
e_name, e_phone, e_submit, e_del, e_update)
w.SetContent(container.NewHSplit(
list,
c,
))
w.ShowAndRun()
fmt.Println(mydata)
}

[/sourcecode]

 

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