HTML向Flex传参

最近有个需求，要在网站中播放一段介绍性的视频，于是做了一个用Flex播放视频的demo。播放视频的代码是以前在网上找的，但是从html页面获得视频地址的时候参数传递问题浪费了很多时间，现整理总结如下：

在Flex中接收参数很简单，通过FlexGlobals.topLevelApplication.parameters或直接用parameters，文档中对parameters的介绍如下：

接收参数代码：

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1. privatefunction init():void 
2. { 
3.     if (parameters != null) { 
4.         var source:String = parameters.source as String; 
5.         var param2:String = parameters.test as String; 
6.     } 
7. } 

			private function init():void
			{
				if (parameters != null) {
					var source:String = parameters.source as String;
					var param2:String = parameters.test as String;
				}
			}

        parameters 参数有两个来源Url和FlashVars，分别介绍如下：

新建一个Flex应用程序时会同时新建一个html页面，Flex应用是嵌入到html中的。其中包括javascript和<noscript>标签两部分，只有当浏览器不支持javascript时才会执行<noscript>中的代码。

        1.通过url传递参数

这种方式和html url传参一样，swf?param1=param1&param2=param2代码如下：

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1. swfobject.embedSWF( 
2.                 "VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv&param2=test", "flashContent",  
3.                 "500", "500",  
4.                 swfVersionStr, xiSwfUrlStr,  
5.                 flashvars, params, attributes); 

swfobject.embedSWF(
                "VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv&param2=test", "flashContent", 
                "500", "500", 
                swfVersionStr, xiSwfUrlStr, 
                flashvars, params, attributes);

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1. <noscript> 
2.     <objectclassid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"width="500"height="500"id="VideoPlayer"> 
3.       <paramname="movie"value="VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv"/> 
4.       ...... 
5.       <!--[if !IE]>--> 
6.       <objecttype="application/x-shockwave-flash"data="VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv&param2=test "width="500"height="500"> 
7.          ....... 
8.       <!--<![endif]--> 
9.       ...... 
10.     </object> 
11. <noscript> 

<noscript>
	<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="500" height="500" id="VideoPlayer">
      <param name="movie" value="VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv" />
      ......
      <!--[if !IE]>-->
      <object type="application/x-shockwave-flash" data="VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv&param2=test " width="500" height="500">
         .......
      <!--<![endif]-->
      ......
	</object>
<noscript>

        2.通过FlashVars传递参数

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1. var flashvars = {}; 
2. flashvars.source = "http://material.157you.com/material/767/dcf_enc.flv"; 
3. flashvars.param2 = "test"; 
4.  
5. swfobject.embedSWF( 
6.     "VideoPlayer.swf", "flashContent",  
7.     "500", "500",  
8.     swfVersionStr, xiSwfUrlStr,  
9.     flashvars, params, attributes); 

            var flashvars = {};
            flashvars.source = "http://material.157you.com/material/767/dcf_enc.flv";
            flashvars.param2 = "test";
            
            swfobject.embedSWF(
                "VideoPlayer.swf", "flashContent", 
                "500", "500", 
                swfVersionStr, xiSwfUrlStr, 
                flashvars, params, attributes);

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1. <noscript> 
2.     <objectclassid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"width="500"height="500"id="VideoPlayer"> 
3.         <paramname="movie"value="VideoPlayer.swf"/> 
4.         <paramname="flashvars"value="source=http://material.157you.com/material/767/dcf_enc.flv&param2=test"/> 
5.      ...... 
6.         <!--[if !IE]>--> 
7.         <objecttype="application/x-shockwave-flash"data="VideoPlayer.swf"width="500"height="500"> 
8.             <paramname="flashvars"value="source=http://material.157you.com/material/767/dcf_enc.flv&param2=test"/> 
9.             ...... 
10.         <!--<![endif]--> 
11.         ...... 
12.     </object> 
13. <noscript> 

<noscript>
	<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="500" height="500" id="VideoPlayer">
		<param name="movie" value="VideoPlayer.swf" />

		<param name="flashvars" value="source=http://material.157you.com/material/767/dcf_enc.flv&param2=test" />
     ......
		<!--[if !IE]>-->
		<object type="application/x-shockwave-flash" data="VideoPlayer.swf" width="500" height="500">
		    <param name="flashvars" value="source=http://material.157you.com/material/767/dcf_enc.flv&param2=test" />
		    ......
		<!--<![endif]-->
		......
	</object>
<noscript>

注意：当同时使用url和flashvars传参时，如果参数名相同则flashvars的值会覆盖url的值

        以上是通过Flex提供的专门传递参数的方式实现的，还有一种方式也可以实现参数传递，我们知道在Flex中可以调用JS的方法，所以可以在JS中写一个方法，返回值为要传递的参数，这样在Flex中就可以获取到了，这算是曲线救国的一种方法。

JS方法，返回参数params：

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1. function flexParams() { 
2.     var params = {param2:‘test‘}; 
3.     params.source = "http://material.157you.com/material/767/dcf_enc.flv"; 
4.  
5.     return params; 
6. } 

			function flexParams() {
				var params = {param2:‘test‘};
				params.source = "http://material.157you.com/material/767/dcf_enc.flv";

				return params;
			}

Flex中调用JS方法，获得参数：

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1. privatefunction init():void 
2. { 
3.     var params:Object = ExternalInterface.call("flexParams"); 
4.      
5.     if (params != null) { 
6.         var source:String = params.source as String; 
7.         var param2:String = params.param2 as String; 
8.     } 
9. } 

			private function init():void
			{
				var params:Object = ExternalInterface.call("flexParams");
				
				if (params != null) {
					var source:String = params.source as String;
					var param2:String = params.param2 as String;
				}
			}

HTML向Flex传参,古老的榕树,5-wow.com