具有范围参考的Devextreme自定义验证器

Question

项目（dx-item）的角度自定义验证如何在devextreme和angular 4中引用它？

<dxi-validation-rule type="custom" [validationCallback]="hasDateSet" message="Follow up date is required."></dxi-validation-rule>



 hasDateSet(e): boolean {
//how can I get referece to this (scope)
//this here give me validator => e
console.log(e);
return false;

}

Answer 1

好的，最后我找到了正确的答案。您需要在构造函数中覆盖它;

this.hasDateSet = this.hasDateSet.bind(this);