Question

我的Backbone模型中存在范围问题。我试图引用Backbone.Validation对象中的模型函数。

即，我无法从goto对象/地图中访问模型函数validateDob：

validation

我可以建议如何设置它？

Answer 1

查看您的代码，validateDob并不需要访问该实例，因此您可以按如下方式将其命名为命名函数：

function validateDob(value) {
  var selDay = $('select[name="dobday"] option:selected').val();
  var selMonth = $('select[name="dobmonth"] option:selected').val();
  var selYear = $('select[name="dobyear"] option:selected').val();

  if (!Utils.isAdult(selDay, selMonth, selYear))
    return _('You have to be at least 18 years old.').translate();
}

Backbone.Model.extend({
  validation: {
    firstname: {
      required: true,
      msg: _('First Name is required').translate()
    },
    dobday: validateDob,
    dobmonth: validateDob,
    dobyear: validateDob
  },
  validateDob: validateDob
});

但是，不建议使用全局选择器直接从DOM访问值。您应该使用作用于视图元素的选择器将这些值设置为模态属性。

在这种情况下，假设您使用backbone.validation插件，您可以定义一个返回验证配置的函数，如：

Backbone.Model.extend({
  validation: function() {
    return {
      firstname: {
        required: true,
        msg: _('First Name is required').translate()
      },
      dobday: this.validateDob, // this should be modal instance now
      dobmonth: this.validateDob,
      dobyear: this.validateDob
    }
  },
  validateDob: function(value) {
    // Now context should be the modal instance so you can do this.get('prop')
    var selDay = $('select[name="dobday"] option:selected').val();
    var selMonth = $('select[name="dobmonth"] option:selected').val();
    var selYear = $('select[name="dobyear"] option:selected').val();

    if (!Utils.isAdult(selDay, selMonth, selYear))
      return _('You have to be at least 18 years old.').translate();
  }
});

Answer 2

你可以试试这个

 Backbone.Model.extend({
    validation: {
        firstname: { required: true, msg: _('First Name is required').translate() }
    },
    initialize:function() {
        this.validation.dobyear= this.validateDob;
        //you can other props similarly
    },
    validateDob: function(value)  {
        var selDay = $('select[name="dobday"] option:selected').val();
        var selMonth = $('select[name="dobmonth"] option:selected').val();
        var selYear = $('select[name="dobyear"] option:selected').val();

        if (!Utils.isAdult(selDay, selMonth, selYear))
            return _('You have to be at least 18 years old.').translate();
    }
});

Backbone验证自定义函数的骨干模型范围问题

2 个答案: