NativeScript/nativescript-core/ui/dialogs

Dialogs module. Examples:

require("globals");

var dialogs = require("ui/dialogs");
dialogs.alert("Some message")
    .then(function () { dialogs.alert("Alert closed!"); });

dialogs.alert("Some message", { title: "My custom title", okButtonText: "Close" })
    .then(function () { dialogs.alert("Alert closed!"); });

dialogs.confirm("Some question?").then(function (r) { dialogs.alert("Result: " + r); });
dialogs.confirm("Some question?", { title: "My custom title", okButtonText: "Yes", cancelButtonText: "No" })
    .then(function (r) { dialogs.alert("Result: " + r); });
dialogs.confirm("Some question?", { title: "My custom title", okButtonText: "Yes", cancelButtonText: "No", neutralButtonText: "Not sure" })
    .then(function (r) { dialogs.alert("Result: " + r); });

dialogs.prompt("Some message")
    .then(function (r) { dialogs.alert("Boolean result: " + r.result + ", entered text: " + r.text); }).fail(function (e) { console.log(e) });

dialogs.prompt("Some message", "Default text for the input", {
    title: "My custom title", okButtonText: "Yes",
    cancelButtonText: "No", neutralButtonText: "Not sure", inputType: dialogs.InputType.Password
}).then(function (r) { dialogs.alert("Boolean result: " + r.result + ", entered text: " + r.text); });

dialogs.login("Enter your user name and password:").then(function(r) {
        dialogs.alert("Result:" + r.result + " User name:" + r.userName + " Password:" + r.password);
   });

dialogs.login("Enter your user name and password:", "", "",
                {
                    title: "Login",
                    okButtonText: "Sign In",
                    cancelButtonText: "Cancel",
                    neutralButtonText:"Sign Up"
                })
  .then(function(r) {
        dialogs.alert("Result:" + r.result + " User name:" + r.userName + " Password:" + r.password);
		if(r.result) {
			// login here
		} else if(r.result === false) {
			// perform something on cancel if you want
		} else if(r.result === "undefined") {
			// you can create new user credentials here for example
		}
   }).fail(function(e){ console.log(e)});

Custom dialogs:

	require("globals");
	var dialogs = require("ui/dialogs");

	/// Splash
	var d = new dialogs.Dialog("Loading...");
	d.show();
	setTimeout(function(){ d.hide(); }, 2000);

	//or cancelable loading dialog
	var d = new dialogs.Dialog("Loading...",
		function(r){ dialogs.alert("You just canceled loading!"); }, { cancelButtonText: "Cancel" });
	d.show();
	setTimeout(function(){ d.hide(); }, 10000);