Adobe® Flex® 4 Language Reference
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flash.html 
HTMLHost 
Packageflash.html
Classpublic class HTMLHost
InheritanceHTMLHost Inheritance Object

Runtime Versions: AIR 1.0

An HTMLHost object defines behaviors of an HTMLLoader object for user interface elements that can be controlled by setting various properties or by calling various methods of the window object of the HTML page. These methods and properties are:
  • window.blur()
  • window.focus()
  • window.moveBy()
  • window.moveTo()
  • window.location
  • window.close()
  • window.open()
  • window.resizeBy()
  • window.resizeTo()
  • window.status
  • window.document.title

The methods in the HTMLHost class provide ways of handling changes in each of these window settings. To use this class, create a new class (a subclass) that extends the HTMLHost class and that overrides the methods for which you want to define behaviors. The methods of the HTMLHost class handle JavaScript properties and methods as follows:

JavaScript property or methodHTMLHost method
window.blur() windowBlur()
window.focus() windowFocus
window.location updateLocation
window.close() windowClose
window.open() createWindow
window.status updateStatus
window.document.title updateTitle

To respond to changes in the window.moveBy(), window.moveTo(), window.resizeBy(), and window.resizeTo() methods, override the set windowRect() method in the subclass of HTMLHost.

Each HTMLHost object can be associated with at most one HTMLLoader object. Assigning an HTMLHost instance to the htmlHost property of the HTMLLoader object establishes this relationship. Assigning null to the htmlHost property of the HTMLLoader object or setting the HTMLHost object as the htmlHost property of another HTMLLoader object removes the HTMLHost from the first HTMLLoader object.

View the examples

See also



Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  AIR-only htmlLoader : flash.html:HTMLLoader
[read-only] The HTMLLoader object to which this HostControl object applies.
HTMLHost
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
  AIR-only windowRect : Rectangle
The property that is changed when JavaScript code in the HTMLLoader object calls the window.moveBy(), window.moveTo(), window.resizeBy(), or window.resizeTo() method.
HTMLHost
Public Methods
 MethodDefined By
  
AIR-only HTMLHost(defaultBehaviors:Boolean = true)
Creates an HTMLHost object.
HTMLHost
  
The function called when JavaScript code in the HTMLLoader object calls the window.open() method.
HTMLHost
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
  
AIR-only updateLocation(locationURL:String):void
The function called when JavaScript code in the HTMLLoader object sets the window.location property.
HTMLHost
  
The function called when JavaScript code in the HTMLLoader object sets the window.status property.
HTMLHost
  
The function called when JavaScript code in the HTMLLoader object sets the window.document.title property or when the title element changes, either via the DOM or because of a new page load.
HTMLHost
 Inherited
Returns the primitive value of the specified object.
Object
  
The function called when JavaScript code in the HTMLLoader object calls the window.blur() method.
HTMLHost
  
The function called when JavaScript code in the HTMLLoader object calls the window.close() method.
HTMLHost
  
The function called when JavaScript code in the HTMLLoader object calls the window.focus() method.
HTMLHost
Property Detail
AIR-only 

htmlLoader

property
htmlLoader:flash.html:HTMLLoader  [read-only]

Runtime Versions: AIR 1.0

The HTMLLoader object to which this HostControl object applies. The htmlHost property of that HTMLLoader object is set to this HostControl object.



Implementation
    public function get htmlLoader():flash.html:HTMLLoader

See also

AIR-only 

windowRect

property 
windowRect:Rectangle

Runtime Versions: AIR 1.0

The property that is changed when JavaScript code in the HTMLLoader object calls the window.moveBy(), window.moveTo(), window.resizeBy(), or window.resizeTo() method.

In the subclass of HTMLHost, override the set windowRect() method to handle the new window bounds, as desired.



Implementation
    public function get windowRect():Rectangle
    public function set windowRect(value:Rectangle):void
Constructor Detail
AIR-only 

HTMLHost

()Constructor
public function HTMLHost(defaultBehaviors:Boolean = true)

Runtime Versions: AIR 1.0

Creates an HTMLHost object.

Parameters
defaultBehaviors:Boolean (default = true) — Indicates wether root-content behaviors should be provided by default.
Method Detail

AIR-only createWindow

()method
public function createWindow(windowCreateOptions:flash.html:HTMLWindowCreateOptions):flash.html:HTMLLoader

Runtime Versions: AIR 1.0

The function called when JavaScript code in the HTMLLoader object calls the window.open() method.

By default, a JavaScript call to window.open() in the HTML page of an HTMLLoader does not open an new NativeWindow object in the runtime. You can open a new NativeWindow object in the runtime by creating a new NativeWindow object in the createWindow method override in the subclass of the HTMLHost class.

Parameters

windowCreateOptions:flash.html:HTMLWindowCreateOptions — An object containing properties in the string passed as the features parameter of the call to window.open().

Returns
flash.html:HTMLLoader — An HTMLLoader object that contains the new HTML page. Typically, you create a new HTMLLoader object in this method, add it to the stage of a new NativeWindow object, and then return it.

AIR-only updateLocation

()method 
public function updateLocation(locationURL:String):void

Runtime Versions: AIR 1.0

The function called when JavaScript code in the HTMLLoader object sets the window.location property.

Parameters

locationURL:String — The value to which the location property of the window property of the HTMLLoader object is set.

AIR-only updateStatus

()method 
public function updateStatus(status:String):void

Runtime Versions: AIR 1.0

The function called when JavaScript code in the HTMLLoader object sets the window.status property.

Parameters

status:String — The value to which the status property of the window property of the HTMLLoader object is set.

AIR-only updateTitle

()method 
public function updateTitle(title:String):void

Runtime Versions: AIR 1.0

The function called when JavaScript code in the HTMLLoader object sets the window.document.title property or when the title element changes, either via the DOM or because of a new page load.

Parameters

title:String — The value to which the window.document.title property of the HTMLLoader object is set.

AIR-only windowBlur

()method 
public function windowBlur():void

Runtime Versions: AIR 1.0

The function called when JavaScript code in the HTMLLoader object calls the window.blur() method.

AIR-only windowClose

()method 
public function windowClose():void

Runtime Versions: AIR 1.0

The function called when JavaScript code in the HTMLLoader object calls the window.close() method.

By default, a JavaScript call to window.close() in the HTML page of an HTMLLoader object closes the windows containing the HTMLLoader object.

AIR-only windowFocus

()method 
public function windowFocus():void

Runtime Versions: AIR 1.0

The function called when JavaScript code in the HTMLLoader object calls the window.focus() method.

HTMLHost.1.as

The following code defines CustomHost, a subclass of HTMLHost. Methods of the CustomHost class override the inherited methods in the HTMLHost class to define actions taken when JavaScript code in the HTMLLoader page sets various properties or calls various methods of the window object:
package
{
    import flash.html.HTMLHost;
    import flash.html.HTMLLoader;
    import flash.display.NativeWindow;
    import flash.display.NativeWindowInitOptions;
    import flash.display.StageScaleMode;
    import flash.geom.Rectangle;
    import flash.text.TextField;

    public class CustomHost extends HTMLHost
    {
        import flash.html.*;
        public var statusField:TextField;
        public function CustomHost(defaultBehaviors:Boolean=true)
        {
            super(defaultBehaviors);
        }
        override public function windowClose():void
        {
            htmlLoader.stage.window.close();
        }
        override public function createWindow(windowCreateOptions:HTMLWindowCreateOptions):HTMLLoader
        {
            var initOptions:NativeWindowInitOptions = new NativeWindowInitOptions();
            var window:NativeWindow = new NativeWindow(initOptions);
            window.visible = true;
            var htmlLoader2:HTMLLoader = new HTMLLoader();
            htmlLoader2.width = window.width;
            htmlLoader2.height = window.height;
            window.stage.scaleMode = StageScaleMode.NO_SCALE;
            window.stage.addChild(htmlLoader2);
            return htmlLoader2;
        }
        override public function updateLocation(locationURL:String):void
        {
            trace(locationURL);
        }        
        override public function set windowRect(value:Rectangle):void
        {
            htmlLoader.stage.nativeWindow.bounds = value;
        }
        override public function updateStatus(status:String):void
        {
            statusField.text = status;
        }        
        override public function updateTitle(title:String):void
        {
            htmlLoader.stage.nativeWindow.title = title + "- Example Application";
        }
        override public function windowBlur():void
        {
            htmlLoader.alpha = 0.5;
        }
        override public function windowFocus():void
        {
            htmlLoader.alpha = 1;
        }
    }
}
Create the following class, which adds an HTMLLoader object to the stage, as well as a TextField object named statusBar. The HTMLLoader object defines a CustomHost object as its htmlHost property:
package
 {
     import flash.display.Sprite;
 
     public class SimpleHTMLBox extends Sprite
     {
         import mx.controls.HTML;
         import flash.html.HTMLLoader;
         import flash.text.TextField;
         import flash.net.URLRequest;
         import CustomHost;
         private var host:CustomHost;
         private var statusField:TextField;
         private var html:HTMLLoader;
         
         public function SimpleHTMLBox()
         {
             html = new HTMLLoader();
             var url:String = "Test.html";
             var urlReq:URLRequest = new URLRequest(url); 
             html.load(urlReq);
             
             host = new CustomHost();
             html.htmlHost = host;
             statusField = new TextField();
             host.statusField = statusField;
             
             configureUI();
         }
         private function configureUI():void
         {
             html.width = 400;
             html.height = 200;
             statusField.width = 400;
             statusField.height = 24;
             statusField.border = true;
             statusField.y = 200;
             
             addChild(html);
             addChild(statusField);                
         }
         
     }
 }

Build an AIR application that adds an object defined by this class to the main window's stage.

Create an HTML page named Test.html in the application resources directory (the directory that contains the application descriptor file), and add the following content to it:

<html>
     <head>
         <title>Test</title>
     </head>
     <body>
         <a href="#" onclick="window.open('Test.html')">window.open('Test.html')</a>
         <br/><a href="#" onclick="window.document.location = 'www.adobe.com'">window.document.location = 'www.adobe.com'</a>
         <br/><a href="#" onclick="window.moveBy(6, 12)">moveBy(6, 12)</a>
         <br/><a href="#" onclick="window.close()">window.close()</a>
         <br/><a href="#" onclick="window.blur()">window.blur()</a>
         <br/><a href="#" onclick="window.focus()">window.focus()</a>
         <br/><a href="#" onclick="window.status = new Date().toString()">window.status = new Date().toString()</a>
     </body>
 </html>

When you test the application, the CustomHost class handles the user-interface-related JavaScript settings in the HTML page.