Modal Dialog Interactions

Modal dialog interactions are a new Discord API feature that allow you to have pop-up windows which prompt the user to input information. Once the user has filled in this information, your program will receive an on_form_submit event which will contain the data which was input. You must use a slash command interaction response to submit your modal form data to Discord, via the on_slashcommand event. From here calling the dialog method of the interaction_create_t event object will trigger the dialog to appear.

Each dialog box may have up to five rows of input fields. The example below demonstrates a simple setup with just one text input:

#include <dpp/dpp.h>
#include <iostream>
 
int main(int argc, char const *argv[])
{
    dpp::cluster bot("token");
 
    bot.on_log(dpp::utility::cout_logger());
 
    bot.on_slashcommand([&bot](const dpp::slashcommand_t& event) {
        /* Check for our /dialog command */
        if (event.command.get_command_name() == "dialog") {
 
            /* Instantiate an interaction_modal_response object */
            dpp::interaction_modal_response modal("my_modal", "Please enter stuff");
 
            /* Add a text component */
            modal.add_component(
                dpp::component().
                set_label("Short type rammel").
                set_id("field_id").
                set_type(dpp::cot_text).
                set_placeholder("gumd").
                set_min_length(5).
                set_max_length(50).
                set_text_style(dpp::text_short)
            );
 
            /* Add another text component in the next row, as required by Discord */
            modal.add_row();
            modal.add_component(
                dpp::component().
                set_label("Type rammel").
                set_id("field_id2").
                set_type(dpp::cot_text).
                set_placeholder("gumf").
                set_min_length(1).
                set_max_length(2000).
                set_text_style(dpp::text_paragraph)
            );
 
            /* Trigger the dialog box. All dialog boxes are ephemeral */
            event.dialog(modal);
        }
    });
 
    /* This event handles form submission for the modal dialog we create above */
    bot.on_form_submit([](const dpp::form_submit_t & event) {
        
        /* For this simple example, we know the first element of the first row ([0][0]) is value type string.
         * In the real world, it may not be safe to make such assumptions!
         */
        std::string v = std::get<std::string>(event.components[0].components[0].value);
 
        dpp::message m;
        m.set_content("You entered: " + v).set_flags(dpp::m_ephemeral);
 
        /* Emit a reply. Form submission is still an interaction and must generate some form of reply! */
        event.reply(m);
    });
 
    bot.on_ready([&bot](const dpp::ready_t & event) {
        if (dpp::run_once<struct register_bot_commands>()) {
            /* Create a slash command and register it as a global command */
            bot.global_command_create(dpp::slashcommand("dialog", "Make a modal dialog box", bot.me.id));
        }
    });
 
    /* Start bot */
 
    bot.start(dpp::st_wait);
    return 0;
}

If you compile and run this program and wait for the global command to register, typing /dialog will present you with a dialog box like the one below: