7

我有 editMessage.js 构造函数：

 constructor(){

  var messageStringProperty1 = new messageStringProperty();
  messageStringProperty1.propertyName = 'title';
  messageStringProperty1.propertyValue = 'This is the menu for school campus';
  this.messageProperties[0] = messageStringProperty1;

  var messageIntegerProperty1 = new messageIntegerProperty();
  messageIntegerProperty1.propertyName = 'Menu Title Font Size';
  messageIntegerProperty1.selectedValue = 30;
  messageIntegerProperty1.selectableValues = [10, 12, 14, 30]
  this.messageProperties[1] = messageIntegerProperty1;

  var messageImageProperty1 = new messageImageProperty();
  messageImageProperty1.propertyName = 'Background Image';
  messageImageProperty1.elementName = 'BackgroundImage';
  messageImageProperty1.originalImage = "http://i2.wp.com/ejohn.org/files/Timers.png";
  this.messageProperties[2] = messageImageProperty1;

 var messageColorProperty1 = new messageColorProperty();
  messageColorProperty1.propertyName = 'Title Color';
  messageColorProperty1.propertyValue = '#ffffff';
  messageColorProperty1.elementName = 'TitleColor';
  this.messageProperties[3] = messageColorProperty1;

}

和editMessage.html（视图）是：

<li class="list-group-item" repeat.for="p of messageProperties">
   <div if.bind="p.propertyType == 'string'">
    <div class="form-group">
       <label for="ln1">Name: ${p.propertyName}</label>
       <input type="text" value.bind="p.propertyValue" class="form-control" id="ln1" >
    </div>
  </div>
  <div if.bind="p.propertyType == 'integer'">
    <div class="form-group">
       <label for="ln2">Name: ${p.propertyName}</label>
       <input type="text" value.bind="p.selectedValue" class="form-control" id="ln2" >
      <select-picker selectable-values.bind="p.selectableValues" selected-value.two-way="p.selectedValue"></select-picker>
   </div>
  </div>
  <div if.bind="p.propertyType == 'image'">
    <div class="form-group, message-border">
      <div class="message-property-name">
       Name: ${p.propertyName}
       <input type="text" value.bind="p.propertyValue" id="ln3" >
      </div>
      <image-picker selected-file.two-way="p.selectedFile" original-image.two-way="p.originalImage" element-name.bind="p.elementName"></image-picker>
    </div>    
  </div>
  <div if.bind="p.propertyType == 'color'">
    <div class="form-group">
       <label for="ln3">Name: ${p.propertyName}</label>
       <input type="text" value.bind="p.propertyValue" class="form-control" id="ln3" >
       <color-picker element-name.bind="p.elementName" initial-color.bind="p.propertyValue"></color-picker>
    </div>    
  </div>
</li>

我想要一个保存按钮，这样如果我的任何 message*property 对象发生更改，它就会启用，否则它会保持禁用状态。

在过去，我创建了一个计时器并通过将原始值与更改后的值进行比较来进行一些脏检查。Aurelia 的最佳方法是什么？

4

1 回答 1

11

感谢 zewa66，我复制了与github.com/aurelia/app-contacts相同的方法。我所做的是在每个业务对象消息*属性上创建了一个 hasPropertyChanged 方法。

例如在 messageStringProperty 我有：

get propertyHasChanged(){
  return this.originalValue != this.propertyValue;
}

然后在主视图上我有：

 get canSave(){
   for (var i=0; i< this.messageProperties.length; i++){
     if (this.messageProperties[i].propertyHasChanged){
      return true;
    }
  }

  return false;
}

在我们看来：

 <button class="btn btn-success" click.trigger="saveChanges()"
                          disabled.bind="!canSave">Save Changes</button>
于 2015-05-05T21:51:00.797 回答