Golang : Get checkbox or extract multipart form data value example
This tutorial is a slight modification on the previous tutorial on the how to upload multiple files and this time we will learn how to get the values of a multi-part form data.
To extract the values from a multi-part form is easy after parsing with ParseMultipartForm()
and with request.FormValue()
The example below will show you how to get the value of a checkbox. Run this code, point your browser to your web server port 8080 and you should see a simple form. Click on the check box and press submit button. Rerun the process again but this time WITHOUT ticking the check box.
Here you go!
package main
import (
"fmt"
"net/http"
)
func Home(w http.ResponseWriter, r *http.Request) {
html := `<html>
<title>Go upload</title>
<body>
<form action="http://example.com:8080/getcheckbox" method="post" enctype="multipart/form-data">
<label for="file">Filenames:</label>
<input type="file" name="multiplefiles" id="multiplefiles" multiple>
<input type="checkbox" name="compress" value="compressboxchecked">
<input type="submit" name="submit" value="Submit">
</form>
</body>
</html>`
//output to web browser(client)
w.Write([]byte(fmt.Sprintf(html)))
}
func GetCheckBox(w http.ResponseWriter, r *http.Request) {
err := r.ParseMultipartForm(200000) // grab the multipart form
if err != nil {
fmt.Fprintln(w, err)
return
}
// get the value of checkbox
// if the checkbox is not ticked, the value will be empty
fmt.Fprintln(w, r.FormValue("compress"))
fmt.Println("Compress the file ? : ", r.FormValue("compress"))
}
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", Home)
mux.HandleFunc("/getcheckbox", GetCheckBox)
http.ListenAndServe(":8080", mux)
}
SEE ALSO :
https://www.socketloop.com/tutorials/upload-multiple-files-golang
See also : Upload multiple files with Go
By Adam Ng
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