How to do trim in @bind

answered 2018-03-18 14:43:00 +0800

chillworld
5367 ● 4 ● 9
https://github.com/chillw...

Oke, let's start to apologise for the short comment.
I looked at this on the phone, didn't have the time or resources to answer this correct so I pointed already to a possible solution.

Why doesn't this work.

Well, @bind is a shortcut for @load and @save together.
While @load just calls a getter, it's possible to do : @load('vm.state.email.trim()')
Look carefully at the trim(), yes the () is needed because otherwise he will call getTrim().
But @save() calls setters, trim function isn't a setter method, it doesn't take any parameters in, so that's the reason why it never can be done in this way.

Solution 1 : Do it in your setter.

You can add the trim method in your getter and setter method before returning/setting your variable.
If it's a basic business requirement of email, that's the place where you need to do it.
Like this, every usage of email will be correct through your whole application.

Solution 2 : Converter.

Zul :

="@bind('vm.state.email') @converter(vm.trimConverter)">

Java :

public class MyViewModel{
    private Converter trimConverter = new Converter() {
        // Implements the 2 methods and do your stuff.
        // Example in link provided.
    };

    public Converter getTrimConverter(){
        return myConverter;
    }
}

Solution 3 : Make your own custom component.

Custom components are underrated in ZK.
They are powerfull, easy to use and the advantage is refactoring is in 1 place in stead of multiple places.
But a custom components only pays off when you will actually use it more then once.

In this case, you can make a class who extends your component (I guess Textbox).
Override the getter (and/or setter) methods for value and add the trim() to it.
Very easy and your zul can stay clean that way.

So, depending on your needs, you have 3 possible solutions now.

Chill.