Openui5 Binding Property With A Function, Instead Of Direct Access

I would like to bind a property (flag_baz in this case) from a JSONModel to a checkbox. Thing is that the json model looks like this. { foo: 'Foo', bar:'Bar', flag_baz : 'X

Solution 1:

Well in case some cares i've found the answer on my own.

All bindings can use a type like so

checkBox.bindProperty("checked", { 
      path : "flag_baz", 
      type : new BooleanStringType()
});

the BooleanStringType class would look like this:

sap.ui.model.SimpleType.extend("BooleanStringType", {
    //called when going from model to ui
    formatValue : function(flag_baz){
        return flag_baz === "X";
    },
    //called when going from ui back to the model
    parseValue : function(flag_baz){
        return flag_baz ? "X" : "";
    },
    validateValue : function(flag_baz){
       //some validation if needed
    }
});