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Answered

App.response and null

Forum|Forum|4 years ago
September 9, 2021
2 replies
811 views

Why, if the input field is empty and the user pressed the OK button, the function is not interrupted and the Else block is processed?

app.addSubMenu({ cName: "Test", cParent: "Help", nPos: 0})
app.addMenuItem({ cParent: "Test", cName: "My_button",  nPos: 2, cExec: "NumberX()", cEnable: "event.rc = (event.target != null);"});

function NumberX() 
{
		Msg = app.response(" ", " ");
		if (Msg == null) {
			app.alert("The user did not enter anything and clicked Ok");
			return;}
		else 
		{	
			app.alert("The user entered some number: " + Msg);
		}			
};

app.trustedFunction(NumberX);

Acrobat SDK and JavaScript

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Correct answer Test Screen Name

The documentation says app.response returns null if the user clicks Cancel. Your user is not doing this!

Community Expert

Community Expert

If they click OK and don't enter anything the returned value is an empty string, which is not the same as null.

Community Expert

Community Expert

You can handle both scenarios at the same time, like this:

if (Msg == null || Msg=="")

Dmitriy K.Author

Known Participant

Once again, many thanks!

Test Screen NameCorrect answer

Legend

The documentation says app.response returns null if the user clicks Cancel. Your user is not doing this!

Dmitriy K.Author

Known Participant

Thank you, now I found it in API

Tell me how you can handle the OK button? or for this you need to use app.execDialog ();

Community Expert

Community Expert

Just replace null in your code with ""...