AS3 NumericStepper 组件

Question

我正在 Flash CS4 中创建 Actionscript 3 应用程序。我创建了一个名为 dropDown 的影片剪辑，并将 Actionscript 导出为 dropDown。在这个影片剪辑中，我放置了一个 numericStepper 组件。我还有一个基本的影片剪辑，其中包含一个文本框，上面写着 Add Dropdown Exporting for Actionscript as DropDownBtn。真的很基本。

添加下拉按钮通过事件侦听器和回调函数创建影片剪辑的实例。

创建实例后，我似乎无法访问数字步进器的值。我的代码如下：

   //create the load dropdown button
    var newButton = new DropDownBtn();
    //position the button
    newButton.x = 20;
    newButton.y = 20;
    //and add it to the stage
    addChild(newButton);
    //add the event listener to the button
    newButton.addEventListener(MouseEvent.MOUSE_DOWN, addDropdown);

    function addDropdown(e:MouseEvent):void{

        //create and instance of the drop down
        var newDropDown = new dropDown();

        //move it over beside the add dropdown button
        newDropDown.x = newButton.width+40;
        newDropDown.y = 20;

        //add the instance of the newDropDown to the display stack
        addChild(newDropDown);

        //add the event listener to the dropdown
        newDropDown.addEventListener(Event.CHANGE, useDropDownValue);
    }

    function useDropDownValue(e:Event):void{
        //this is where I need to utilize the value of the Numeric Stepper
        //I thought it would be accessed as follows but it doesn't seem to work
        //I added a trace to make sure this function is being executed and that works
        //when i comment out my attempt at using the Numeric Stepper Value
        trace("useDropDownValue Function Accessed");
        var dropDownValue = newDropdown.value;
    }

Answer 1

您已将

 var newDropDown = new dropDown();

范围限定在 addDropdown 函数内部

您需要将其移到该函数之外以使其具有全局范围

 //create the load dropdown button
    var newButton = new DropDownBtn();
    //position the button
    newButton.x = 20;
    newButton.y = 20;
    //and add it to the stage
    addChild(newButton);
    //add the event listener to the button
    newButton.addEventListener(MouseEvent.MOUSE_DOWN, addDropdown);



// GLOBAL SCOPE HERE
//create and instance of the drop down
var newDropDown = new dropDown();
    function addDropdown(e:MouseEvent):void{


        //move it over beside the add dropdown button
        newDropDown.x = newButton.width+40;
        newDropDown.y = 20;

        //add the instance of the newDropDown to the display stack
        addChild(newDropDown);

        //add the event listener to the dropdown
        newDropDown.addEventListener(Event.CHANGE, useDropDownValue);
    }

    function useDropDownValue(e:Event):void{
        //this is where I need to utilize the value of the Numeric Stepper
        //I thought it would be accessed as follows but it doesn't seem to work
        //I added a trace to make sure this function is being executed and that works
        //when i comment out my attempt at using the Numeric Stepper Value
        trace("useDropDownValue Function Accessed");
        var dropDownValue = newDropdown.value;
    }

Answer 2

好的，我明白了。

我必须在影片剪辑中引用 NumericStepper 的实例名称。像这样。

var numericStepperValue = movieClip.NumericStepperInstance.value;

感谢您的帮助。