将变量从父级传递给子级的问题。 AS3答案

【问题标题】：issues passing variables from parent to child. AS3将变量从父级传递给子级的问题。 AS3
【发布时间】：2011-10-15 21:23:32
【问题描述】：

我正在尝试从我的子 MC 中的父级访问一些变量。

父代码：

var data_history:String;    
function finish_checkUp(event:Event):void{          
        var checkUp_stat:String;
        checkUp_stat = data.check_UP_STAT;
        if (checkUp_stat == "PASSED"){
            data_history = "FALSE";
            gotoAndPlay ("domain_check");
        }
        else if (checkUp_stat == "FAILED"){
            data_history = "TRUE";
            gotoAndPlay ("error_data_conflict");
        }
        else if (checkUp_stat == "FAILED_UN"){
            data_history = "TRUE";
            gotoAndPlay ("");
        }   
}

儿童主持人：

 contt_btn.addEventListener(MouseEvent.MOUSE_DOWN, mouseClick);
    contt_btn.addEventListener(MouseEvent.ROLL_OVER,contt_btnOver);
    contt_btn.addEventListener(MouseEvent.ROLL_OUT,contt_btnOut);
    function contt_btnOver(event:MouseEvent):void{
        contt_btn.gotoAndPlay("over");
    }
    function contt_btnOut(event:MouseEvent):void{
        contt_btn.gotoAndPlay("out");
    }
    function mouseClick(event:MouseEvent):void
    {
        trace (MovieClip(this.parent).data_history);
        if (data_history == "TRUE"){
    MovieClip(parent).gotoAndPlay("begin_erasing");
        }
        else if (data_history == "FALSE"){
            gotoAndPlay("");}
    }

现在如您所见，我尝试了trace 方法，但没有成功。 Flash 不会报告有关trace 方法的任何错误，但会报告两个未定义的变量(data_history)。我尝试在脚本顶部的所有函数之上使用跟踪方法，但仍然出现相同的错误。

有什么想法吗？

【问题讨论】：

标签： flash actionscript-3 actionscript

【解决方案1】：

在跟踪中，您通过 this.parent 引用 data_history 属性。假设跟踪您的值，您需要调整 if...else 以通过 parent 引用该属性：

function mouseClick(event:MouseEvent):void
{
    trace (MovieClip(this.parent).data_history);
    if (MovieClip(this.parent).data_history == "TRUE"){
MovieClip(parent).gotoAndPlay("begin_erasing");
    }
    else if (MovieClip(this.parent).data_history == "FALSE"){
        gotoAndPlay("");}
}

如果您在其中的跟踪引发错误，则该属性从不存在于父级上。

【讨论】：

【解决方案2】：

子电影不应该以这种方式检查其父电影。

试试这个：

在孩子的文档类中：

public var data_history:String;
function mouseClick(event:MouseEvent):void{
           if (data_history == "TRUE"){
                  MovieClip(parent).gotoAndPlay("begin_erasing");
           }
           else if (data_history == "FALSE"){
                   gotoAndPlay("");}
           }
 }

在父级中

function finish_checkUp(event:Event):void{ 
          var checkUp_stat:String;
          checkUp_stat = data.check_UP_STAT;
          if (checkUp_stat == "PASSED"){
              data_history = "FALSE";
              if (childMC as ChildDocumentClass) {
                  (childMC as ChildDocumentClass).data_history = data_history;
              }
              gotoAndPlay ("domain_check");
          }
          else if (checkUp_stat == "FAILED"){
              data_history = "TRUE";
              if (childMC as ChildDocumentClass) {
                  (childMC as ChildDocumentClass).data_history = data_history;
              }
              gotoAndPlay ("error_data_conflict");
          }
          else if (checkUp_stat == "FAILED_UN"){
              data_history = "TRUE";
              if (childMC as ChildDocumentClass) {
                  (childMC as ChildDocumentClass).data_history = data_history;
              }
              gotoAndPlay ("");
          }
  }

【讨论】：