How Do I Parse and Retrieve Form Input from HTML in Goji?

Parse Input from HTML

When working with HTTP forms in Goji, it's essential to understand how to parse and retrieve data submitted by users. This tutorial will guide you through the process step by step.

Understanding Form Parsing

To access form values in Goji, you first need to call r.ParseForm(). This function reads the raw form data from the HTTP request and makes it available in the r object.

Retrieving Form Values

Once you've parsed the form, you can retrieve specific form values using the PostFormValue or FormValue methods. The former is used for POST submissions, while the latter can be used for both POST and GET submissions.

For example, to retrieve the value of an input field with the name attribute in a POST form, you would use:

name := r.PostFormValue("name")

Connecting HTML to Goji

To connect your HTML form to your Goji application, you can use the Handle or Get methods. The Handle method allows you to specify a URL pattern and a handler function for HTTP requests that match that pattern.

For example, if you have an input field with the name attribute in a form with the action attribute set to "/hello," you would create a handler function like this:

func hello(c web.C, w http.ResponseWriter, r *http.Request) {
    // Call to ParseForm makes form fields available.
    err := r.ParseForm()
    if err != nil {
        // Handle error here via logging and then return            
    }

    name := r.PostFormValue("name")
    fmt.Fprintf(w, "Hello, %s!", name)
}

And then register the handler with the Handle method:

goji.Handle("/hello", hello)

Conclusion

By following these steps, you can successfully parse form input in your Goji application and retrieve user-submitted data for further processing. Remember to call r.ParseForm() before accessing form values, and connect your HTML form to your Goji application using the Handle or Get methods.

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