Conversion Exception in Appway 5.1

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n/A

postedon November 26, 2013at 2:09 PM

I'm trying to build a field that can take partial dates, e.g. 2013, 12.2013 or 7.12.2013. I'm using a converter to convert these dates into 2013, 201312, 20131207, since in this format, they can easily be compared.

When I enter something like 13.2013, my input converter throws an exception. Which I think is correct. Unfortunately, the tooltext shown in the yellow triangle is the code of the converter. I there a way to show a dedicated message to the user?

Stephan

repliedon November 26, 2013at 3:24 PM

Unfortunately there is no easy way to do this. You have to use a trick.

You first have to make sure that your converter code does not throw an exception. Maybe you have to wrap your code with a Try/Catch statement. In case the user has entered an illegal value, you can use the following piece of script code to manually "inject" a validation error:

1String $componentPath := COMPONENTPATH();
2String $message := 'No, no, no!!!';
3SCREENCONTEXT().getScreenState().setError($componentPath, $message, $value);

The function "COMPONENTPATH()" in line 1 returns a value used as identifier for the screen component generating the validation error. The variable "$message" on line 2 contains the error message you would like to show to the user. The third parameter of the method "setError" on line 3 is the original value entered by the user. When the screen is rendered, this value will be displayed in the text field.

Your converter code must return a value at the end. You can return null or any other legal value for the type of binding you are using on the text field. If it is a String variable, you can also return the original value entered by the user.

- Ste

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