Jewel Alert
Reference
Available since version 0.9.4
Class | Extends | Implements |
---|---|---|
org.apache.royale.jewel.Alert | org.apache.royale.jewel.Group | org.apache.royale.core.IPopUp |
Note: This component is currently only available in JavaScript.
Overview
The Alert
component displays a message and one or more buttons in a window that pops up over all other controls and views.
It uses the AlertView
beads to display a modal dialog with a title and a variety of buttons configured through the flag property of its show
static function. The user cannot use the rest of the interface without first engaging with the modal dialog.
Alert
uses the HTML dialog element, which currently has very limited cross-browser support. To ensure support across all modern browsers, we use the dialogPolyfill externs.
Example of use
Alert
is not designed to be instantiated the way the majority of components are. Instead, use the static method show
to display the component, as in the following snippet:
Alert.show('This alert shows a label text and the default OK button.', 'Alert Example');
When you use Alert.show()
, Royale generates a modal dialog and adds it, centered in front of the application and on top of all displayed visual elements.
Click the following button to see an example of Alert
:
To close the window, click one of the buttons on the bottom controlBar
, or programmatically call the Alert.close()
method on the instance.
Relevant Properties and Methods
Check the reference of org.apache.royale.jewel.Alert for a more detailed list of properties and methods.
Properties
PROPERTY | Type | Description |
---|---|---|
title | String | The title of the Alert . |
message | String | The message to display in the Alert body. |
flags | uint | The buttons to display on the Alert as bit-mask values. Possible values are: YES , NO , OK , and CANCEL . |
Methods
Method | Parameters | Description |
---|---|---|
show | message(String), title(String), flags(uint), parent(Object) | Shows the Alert non modal anchored to the given parent object, which is usually a root component such as *, as a UIView or body if null. |
close | buttonFlag:uint = 0x000004 | Closes the dialog element. |
Relevant Events
The Alert
component uses the CloseEvent.CLOSE
event when the user removes it from the application. You can attach callback listeners to the CloseEvent.CLOSE
as follows:
var alert:Alert = Alert.show("Do you want to save your changes?", "Save Changes", Alert.OK | Alert.NO);
alert.addEventListener(CloseEvent.CLOSE, alertClickHandler);
Then check event.detail
to know what button was clicked inside the dialog.
// Event handler callback function for CloseEvent event
private function alertClickHandler(event:CloseEvent):void {
if (event.detail == Alert.YES)
status.text="You answered Yes";
else
status.text="You answered No";
}
Relevant Beads
The Alert
component uses the following beads:
Bead Type | Implementation | Description |
---|---|---|
IBeadModel | org.apache.royale.jewel.beads.models.AlertModel | The data model for the Alert. |
IBeadView | org.apache.royale.jewel.beads.views.AlertView | The bead used to create the elements of the Alert. |
IBeadController | org.apache.royale.jewel.beads.controllers.AlertController | The bead used to handle input events. |
IBeadLayout | org.apache.royale.jewel.beads.layouts.NullLayout(*) | The bead used to position the elements of the Alert. |
(*) NullLayout is used temporarily.