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HTML向Flex传参
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最近有個需求，要在網站中播放一段介紹性的視頻，于是做了一個用Flex播放視頻的demo。播放視頻的代碼是以前在網上找的，但是從html頁面獲得視頻地址的時候參數傳遞問題浪費了很多時間，現整理總結如下：
在Flex中接收參數很簡單，通過FlexGlobals.topLevelApplication.parameters或直接用parameters，文檔中對parameters的介紹如下：
spark.components.Application.parameters():Object [只讀] 包含表示提供給此 Application 的參數的名稱-值對的 Object。可以使用 for-in 循環來提取 parameters Object 中的所有名稱和值。 參數有兩個源：Application 的 URL 中的查詢字符串和 FlashVars HTML 參數（僅適用于主 Application）的值。 |
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接收參數代碼：
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privatefunction init():void? {? ??? if (parameters != null) {? ??????? var source:String = parameters.source as String;? ??????? var param2:String = parameters.test as String;? ??? }? }? private function init():void{if (parameters != null) {var source:String = parameters.source as String;var param2:String = parameters.test as String;}}
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??????? parameters 參數有兩個來源Url和FlashVars，分別介紹如下：
新建一個Flex應用程序時會同時新建一個html頁面，Flex應用是嵌入到html中的。其中包括javascript和<noscript>標簽兩部分，只有當瀏覽器不支持javascript時才會執行<noscript>中的代碼。
??????? 1.通過url傳遞參數
這種方式和html url傳參一樣，swf?param1=param1¶m2=param2代碼如下：
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swfobject.embedSWF(? ??????????????? "VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv¶m2=test", "flashContent",?? ??????????????? "500", "500",?? ??????????????? swfVersionStr, xiSwfUrlStr,?? ??????????????? flashvars, params, attributes);? swfobject.embedSWF("VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv¶m2=test", "flashContent", "500", "500", swfVersionStr, xiSwfUrlStr, flashvars, params, attributes);
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<noscript>? ??? <objectclassid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"width="500"height="500"id="VideoPlayer">? ????? <paramname="movie"value="VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv"/>? ????? ......? ????? ? ????? <objecttype="application/x-shockwave-flash"data="VideoPlayer.swf?source=http://material.157you.com/material/767/dcf_enc.flv¶m2=test "width="500"height="500">? ???????? .......? ????? ? ????? ......? ??? </object>? <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¶m2=test " width="500" height="500">.......<!--<![endif]-->......</object>
<noscript>
??????? 2.通過FlashVars傳遞參數
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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);? 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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<noscript>? ??? <objectclassid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"width="500"height="500"id="VideoPlayer">? ??????? <paramname="movie"value="VideoPlayer.swf"/>? ??????? <paramname="flashvars"value="source=http://material.157you.com/material/767/dcf_enc.flv¶m2=test"/>? ???? ......? ??????? ? ??????? <objecttype="application/x-shockwave-flash"data="VideoPlayer.swf"width="500"height="500">? ??????????? <paramname="flashvars"value="source=http://material.157you.com/material/767/dcf_enc.flv¶m2=test"/>? ??????????? ......? ??????? ? ??????? ......? ??? </object>? <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¶m2=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¶m2=test" />......<!--<![endif]-->......</object>
<noscript>
注意：當同時使用url和flashvars傳參時，如果參數名相同則flashvars的值會覆蓋url的值
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??????? 以上是通過Flex提供的專門傳遞參數的方式實現的，還有一種方式也可以實現參數傳遞，我們知道在Flex中可以調用JS的方法，所以可以在JS中寫一個方法，返回值為要傳遞的參數，這樣在Flex中就可以獲取到了，這算是曲線救國的一種方法。
JS方法，返回參數params：
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function flexParams() {? ??? var params = {param2:'test'};? ??? params.source = "http://material.157you.com/material/767/dcf_enc.flv";? ? ??? return params;? }? function flexParams() {var params = {param2:'test'};params.source = "http://material.157you.com/material/767/dcf_enc.flv";return params;}
Flex中調用JS方法，獲得參數：
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privatefunction 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;? ??? }? }? 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;}}
轉載于:https://www.cnblogs.com/regalys168/p/3627748.html
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