在Aurelia的子类上使用@bindable属性 [英] Using the @bindable attribute on child class in Aurelia

问题描述

对于当前的项目，我们正在创建许多自定义控件，它们共享相同的属性并且可以绑定.

For the current project at work, we are creating quite a few custom controls that all share the same properties and that are bindable.

@bindable required: boolean = false;
@bindable minLength: number = 0;
@bindable maxLength: number = 0;

由于我们要避免代码重复，因此我们的想法是将这些可绑定属性保留在一个单独的类中，在本例中称为"Validation".

Since we'd like to avoid code duplication, the idea is to keep these bindable properties in a separate class, called 'Validation' in this case.

import {Validation} from "./validation";

export class MyClass {
  private validation: Validation = new Validation();

  // also tried:
  // @bindable validation: Validation = new Validation();
}

问题是如何使HTML绑定到Validation类中的属性.这样做validation.required.bind="someProperty.required"不会更新验证实例上的required属性.我们尝试使用DI，但这似乎也没有减少.

The question is how to get the HTML to bind to the properties in the Validation class. Doing this validation.required.bind="someProperty.required" doesn't update the required property on the validation instance. We attempted to use DI, but that didn't seem to cut it either.

import {inject} from "aurelia-framework";
import {Validation} from "./validation";

@inject(Validation)
export class MyClass {
  constructor(private validation: Validation) {
    this.validation = validation;
  }
}

任何提示将不胜感激.

Aurelia似乎将"validation.required"解释为命令而不是表达式.

It seems that Aurelia interprets 'validation.required' as a command rather than an expression.

WARN [templating-binding] Unknown binding command. Object {defaultBindingMode: null, attrName: "validation", attrValue: "true", command: "required", expression: null}

推荐答案

作为一种变通办法，直到Aurelia支持具有可绑定属性的继承，我将绑定到具有某些共享属性的类.可绑定的控件现在将在各个控件之间重复.

As a work-around until inheritance with bindable properties gets supported in Aurelia, I am binding to a class that has some of the shared properties. The bindable ones will get duplicated across the controls for now.

import {bindable, bindingMode} from "aurelia-framework";
import {IControlBase, ControlBase} from "./controlbase";

export class MyClass {
  @bindable controlbase: IControlBase = new ControlBase();
  @bindable label: string = "";
  @bindable editing: boolean = false;
  @bindable({ defaultBindingMode: bindingMode.twoWay })
  value: string;
}

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