如何通过参数来定制组件ActionScript编写

问题描述

我有ActionScript编写的自定义组件。它有构造函数期待一些参数。

I have a custom component written in ActionScript. It has constructor which is expecting some arguments.

我希望包括自定义组件在MXML这样，

I want to include that custom component in mxml like this,

Main.mxml

...
<custom:CustomActionScriptComponent/>  // Error line ..
..

不过，它显示了我一个错误说

But, it shows me an error saying

Error 1136: Incorrect number of arguments.  Expected 1.

如何通过参数MXML文件，该自定义动作成分？

How to pass parameter in MXML file, to that custom ActionScript component?

推荐答案

作为标签，MXML并不支持类的构造函数。

As tags, MXML does not support class constructors.

按照您的ActionScript类，可以允许参数的默认初始化：

Per your ActionScript class, you could allow default initialization of the parameter:

    public function CustomActionScriptComponent(parameter:Object=null)
    {
        super();
    }

然后实现一个创造完整的事件处理程序在MXML：

Then implement a creation complete event handler in your MXML:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx"
               creationComplete="creationCompleteHandler(event)">

    <fx:Script>
        <![CDATA[
            import mx.events.FlexEvent;

            protected function creationCompleteHandler(event:FlexEvent):void
            {
                customActionScriptComponent.parameter = {};
            }
        ]]>
    </fx:Script>

    <custom:CustomActionScriptComponent id="customActionScriptComponent" />

</s:Application>

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