使用Aurelia的架构表单

Question

我正在使用Aurelia基于json构建动态表单.表单是从json生成的,如下所示:

Schema = [{
    'key': 'Name',
    'display': 'Name',
    'type': 'text',
    'placeholder': 'Name',
    'required': true
},
{
    'key': 'IsSubscribed',
    'display': 'Subscribed to newsletter?',
    'type': 'checkbox',
    'placeholder': null,
    'required': false
}];

填写表单的模型可通过Web API服务获得.所以,我成功使用以下模板.

    <template>

    <section class="au-animate">
    <h2>Edit Form</h2>
    <form class="form-group">
        <div repeat.for="item of Schema" class="form-group">
            <label if.bind="item.type === 'text' || item.type === 'checkbox'" class="control-label" for.bind="item.key">${item.display}
                <input class="form-control" id.bind="item.key" placeholder.bind="item.placeholder" type.bind="item.type" value.bind="Model[item.key]" />    
            </label>
            <label if.bind="item.type === 'textarea'">${item.display}
                <textarea placeholder.bind="item.placeholder" value.bind="Model[item.key]></textarea>
            </label>
            ...
        </div>
    </form>
    </section>

    </template>

当模型包含另一个对象作为属性时,我现在面临困难.例如,对于属性地址我想要一个City的输入框.

因此,item.key = "Address.City".

我可以绑定(1)Model.Address.City或(2)Model ['Address'] ['City']这是不可能的,因为表单是在运行时生成的.我想用类似的东西(3)型号["Address.City"],这样我就可以用模型[item.key]的结合.有没有简单的语法来实现这一目标？

Angular Js中类似应用的示例是Angular Schema Form

提前致谢.

Answer 1

这可以通过一种能够理解如何处理键的绑定行为来实现.最终结果是绑定将像任何其他绑定表达式一样起作用.

这是一个例子:https://gist.run？id = 720d20b2db5adba92f62f7e665cf3b96

app.html

<template>
  <require from="./dynamic-expression-binding-behavior"></require>

  <label>
    Address 1:
    <input value.bind="model & dynamicExpression:'address.address1'">
  </label>
  <label>
    Address 2:
    <input value.bind="model & dynamicExpression:'address.address2'">
  </label>
  <label>
    City:
    <input value.bind="model & dynamicExpression:key">
  </label>
  <label>
    State:
    <input value.bind="model & dynamicExpression:'address.state'">
  </label>
  <label>
    Zip:
    <input value.bind="model & dynamicExpression:'address.zip'">
  </label>
</template>

app.js

export class App {
  model = {
    address: {
      address1: '1 Main Street',
      address2: '',
      city: 'Burlington',
      state: 'VT',
      zip: '05401'
    }
  };

  key = 'address.city';
}

动态表达结合-behavior.js

import {inject} from 'aurelia-dependency-injection';
import {Parser} from 'aurelia-binding';
import {rebaseExpression} from './expression-rebaser';

@inject(Parser)
export class DynamicExpressionBindingBehavior {
  constructor(parser) {
    this.parser = parser;
  }

  bind(binding, source, rawExpression) {
    // Parse the expression that was passed as a string argument to
    // the binding behavior.
    let expression = this.parser.parse(rawExpression);

    // Rebase the expression
    expression = rebaseExpression(expression, binding.sourceExpression);

    // Squirrel away the binding's original expression so we can restore
    // the binding to it's initial state later.
    binding.originalSourceExpression = binding.sourceExpression;

    // Replace the binding's expression.
    binding.sourceExpression = expression;
  }

  unbind(binding, source) {
    // Restore the binding to it's initial state.
    binding.sourceExpression = binding.originalSourceExpression;
    binding.originalSourceExpression = null;
  }
}