how to make the breezejs required validator allow empty strings

问题

What is the preferred way in breezejs to allow empty strings in required properties?

I found this answer which recommends replacing the required validator like this:

Validator.required = function (context) {
    var valFn = function (v, ctx) {
        return v != null;
    }
    return new Validator("required", valFn, context);
};
// register the new validator so that metadata can find it. 
Validator.registerFactory(Validator.required, "required");

There's also mention of a allowEmptyStrings flag somewhere.

What is the preferred way to do this?

回答1:

You can create a 'required' validator that allows empty string like this:

var v0 = Validator.required({ allowEmptyStrings: true });

来源：https://stackoverflow.com/questions/23478929/how-to-make-the-breezejs-required-validator-allow-empty-strings