Answering prompt messages
Aside from alert messages, there are prompt messages that ask users to input their answer into a single text field. To handle this kind of dialog box from web pages, PhantomJS allows us to handle and answer back to this dialog prompts using the onPrompt callback.
page.onPrompt = function(message, defaultVal) {
if (message === 'How old are you?') {
return '18';
}
return defaultVal;
};The onPrompt function callback receives two parameters. The first parameter is the message to be displayed in the prompt dialog; this normally asks a question back to the user. The second parameter is the default value or answer.
