Canjs中的验证

Question

如何实现Canjs的验证？我遇到了一些麻烦。在他们的指南页面上，他们这样做：

Contact = can.Observe({
init : function(){
    // validates that birthday is in the future
    this.validate("birthday",function(birthday){
        if(birthday > new Date){
            return "your birthday needs to be in the past"
        }
    })
}
},{});

但是当我尝试这个的时候，我没有任何成功。

Answer 1

应该能行得通。您只需要在您的观察实例(Fiddle)上使用.errors()检索验证错误：

var Contact = can.Observe({
init : function(){
    // validates that birthday is in the future
    this.validate("birthday",function(birthday){
        if(birthday > new Date){
            return "your birthday needs to be in the past"
        }
    })
}
},{});

var dave = new Contact({
    name: 'Dave',
    birthday: new Date(2024, 05, 05)
});

console.log(dave.errors());

您可以在can.Map.validations documentation中找到完整的演练。