How to interact with the Window Object's Methods

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Using External Objects for Javascript, you can interact with the Window Object from the GeneXus code. Also, it exposes some methods that can be called from the GeneXus code; for example:

  • alert method : Displays an alert box with a message and an OK button.
  • prompt method : Displays a dialog box that prompts the visitor for input.

In this case, we don't have any associated external javascript. The Javascript External Name of the EO has to be window.

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We need to define the methods (alert and prompt), which have to be static methods, along with their parameters.

 

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How to call the window methods

Event 'alert'
    ExternalObjectWindow.alert('Read the license agreement first.')
Endevent

Event 'promptnow'
    &outdata = ExternalObjectWindow.prompt(' ')
Endevent

Note that we don't define a variable based on the External Object type because the methods we are calling are static. And, if your External Object's method has a return value it cannot be invoked from any event that has any server side code, like calling a Procedure object (the Procedure cannot be called on the same event that is calling the method wich returns a value).

Download the sample from Window Object interaction sample.

See also

How to execute GeneXus events from JS code using External Objects

How to implement a dictionary data type using JS and server side code




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