Get element that triggered action

[Former Member]

Hello,

Does anybody know how to find out which element on the screen triggered the action? Within action method I need to know which element triggered the action.

Elements are created dynamically and action to them is bound during run time.

Thank you.

[Former Member · Accepted solution]

Example: You have 2 buttons "B1", "B2" and both are assigned the same action. How to know in the action handler which button was pressed?

Solutions: Event parameter mapping

B1.mappingOfOnAction().addParameter("Button", "B1");
B2.mappingOfOnAction().addParameter("Button", "B2");

Declare an action parameter "Button" of type String. Then at runtime, this parameter will contain "B1" or "B2" depending on the button that was pressed.

Armin

[Former Member · Accepted solution]

Hello Armin,

This is for ABAP WebDynpro.

B1 is an ID that I assign to a button during creation, right?

Thanks.

[Former Member · Accepted solution]

"B1" is the ID of the first button in this example, B1 is a reference to the button (in wdDoModifyView()) which you can get by calling method view.getElement("B1").

WD ABAP should have similar methods, I don't know the exact syntax.

Armin

[Former Member · Accepted solution]

Hello Amin,

I am very clear on wdDoModiryView is here for.

I thougth that at the time of creation of a button I assign an id to it. For example MyId="5234523452345"

Than, in action handler I add a parameter with the same name as I created - MyId of type int. So when the action is called I get reference to ID of an element that triggered that action, correct?

If so what is wdDoModifyView is for?

Could you please comment?

Thank you

[Former Member · Accepted solution]

I don't understand the question "If so what is wdDoModifyView is for?".

In WD Java, this method is the only place where you can create and access view elements, I assume this is similar in WD ABAP.

So if you want to create buttons programmatically or get a reference to an existing button and define an event parameter mapping (as in my example), this must be done inside method wdDoModifyView().

Armin

[Former Member · Accepted solution]

Hello Armin,

Not sure about Java WebDynpro but in ABAP you can create a global reference to the view and access it anywhere, so it does not have to be in wdDoModifyView.

[Former Member · Accepted solution]

Hello Armin,

I awarded you some points.

I was able to get reference to the element that triggered the action partially with your suggestion.

Thank you.