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What Is The Difference Between Changewatcher.watch, And Bindingutils.bindproperty?

Answer»

ChangeWatcher: Acts like the watch on AS2. It watches a variable for changes and when SOMETHING happens fires an event. Make sure you call the canWatch to ensure that you can watch it! There are 3 ways to specify the second parameter, the chain.

  • A String containing the name of a PUBLIC bindable property of the host OBJECT.ChangeWatcher.watch(this, "myvar", handler)
  • An Object in the form: 

{ name: property name, ACCESS: function (host) { return host[name] } }.
The Object contains the name of a public bindable property, and a function which serves as a getter for that property.ChangeWatcher.watch(this, { name:"myvar", getter: function():String { return "something" }}, handler);

  • A non-empty Array containing any combination of the first two options. This represents a chain of bindable properties accessible from the host. For example, to watch the property host.a.b.C, call the method as: watch(host, ["a","b","c"] BindingUtils.bindProperty

Works pretty much the same way as the watch, but instead of having to handle and event it allows you to immediately bind two properties one-way.The first two parameters are for the the target, the second parameters are the triggers.

BindingUtils.bindProperty( this, "va1", this, "var2");

Note : Make sure you add the flex framework.swc to your project Library Path to have access to the mx.binding.util class.

ChangeWatcher: Acts like the watch on AS2. It watches a variable for changes and when something happens fires an event. Make sure you call the canWatch to ensure that you can watch it! There are 3 ways to specify the second parameter, the chain.

{ name: property name, access: function (host) { return host[name] } }.
The Object contains the name of a public bindable property, and a function which serves as a getter for that property.ChangeWatcher.watch(this, { name:"myvar", getter: function():String { return "something" }}, handler);

Works pretty much the same way as the watch, but instead of having to handle and event it allows you to immediately bind two properties one-way.The first two parameters are for the the target, the second parameters are the triggers.

BindingUtils.bindProperty( this, "va1", this, "var2");

Note : Make sure you add the flex framework.swc to your project Library Path to have access to the mx.binding.util class.



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