Problema em devolver valores da função JavaScript para Flex

StackOverflow https://stackoverflow.com/questions/1088104

Pergunta

No código flexível ligado, eu estou tentando chamar uma função javascript na embalagem HTML. O exemplo também é ao vivo em: http://www.cse.epicenterlabs.com/mbm/ajax_api.html O problema que estou enfrentando é que eu tenho que clicar duas vezes no botão para obter o resultado desejado. Parece que existe algum atraso na definição do variável "output". Como eu poderia obter a saída da função de javascript em um clique? 

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:TextArea x="209" y="139" height="245" width="318"  id="text1" fontSize="28"/>
    <mx:Script>
        <![CDATA[
                import mx.rpc.events.ResultEvent;
    import flash.external.*;

     public function callWrapper():void {
        var s:String;
        if (ExternalInterface.available) {
           var wrapperFunction:String = "initialize";
           s = ExternalInterface.call(wrapperFunction,text1.text);
           text1.text = s;

        } else {
           s = "Wrapper not available";
        }
        trace(s); 
     }

                ]]>
    </mx:Script>
    <mx:Button x="92" y="118" label="Transliterate" click="callWrapper()"/>
</mx:Application>

HTML Wrapper: 

<!-- saved from url=(0014)about:internet -->
<html lang="en">

<!-- 
Smart developers always View Source. 

This application was built using Adobe Flex, an open source framework
for building rich Internet applications that get delivered via the
Flash Player or to desktops via Adobe AIR. 

Learn more about Flex at http://flex.org 
// -->

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<!--  BEGIN Browser History required section -->
<link rel="stylesheet" type="text/css" href="history/history.css" />
<!--  END Browser History required section -->

<title></title>
<script src="AC_OETags.js" language="javascript"></script>

<!--  BEGIN Browser History required section -->
<script src="history/history.js" language="javascript"></script>
<!--  END Browser History required section -->

<style>
body { margin: 0px; overflow:hidden }
</style>
<script language="JavaScript" type="text/javascript">
<!--
// -----------------------------------------------------------------------------
// Globals
// Major version of Flash required
var requiredMajorVersion = 9;
// Minor version of Flash required
var requiredMinorVersion = 0;
// Minor version of Flash required
var requiredRevision = 28;
// -----------------------------------------------------------------------------
// -->
</script>
</head>

<body scroll="no">
      <script type="text/javascript" src="http://www.google.com/jsapi"></script>
    <script type="text/javascript">

    google.load("language", "1");

        var output;
    function initialize(input) {
      google.language.transliterate([input], "en", "hi", function(result) {
        if (!result.error) {
          if (result.transliterations && result.transliterations.length > 0 &&
            result.transliterations[0].transliteratedWords.length > 0) {
            output = result.transliterations[0].transliteratedWords[0];
          }
        }
      });
    return output;
    }
    </script>
    <script language="JavaScript" type="text/javascript">
<!--
// Version check for the Flash Player that has the ability to start Player Product Install (6.0r65)
var hasProductInstall = DetectFlashVer(6, 0, 65);

// Version check based upon the values defined in globals
var hasRequestedVersion = DetectFlashVer(requiredMajorVersion, requiredMinorVersion, requiredRevision);

if ( hasProductInstall && !hasRequestedVersion ) {
    // DO NOT MODIFY THE FOLLOWING FOUR LINES
    // Location visited after installation is complete if installation is required
    var MMPlayerType = (isIE == true) ? "ActiveX" : "PlugIn";
    var MMredirectURL = window.location;
    document.title = document.title.slice(0, 47) + " - Flash Player Installation";
    var MMdoctitle = document.title;

    AC_FL_RunContent(
        "src", "playerProductInstall",
        "FlashVars", "MMredirectURL="+MMredirectURL+'&MMplayerType='+MMPlayerType+'&MMdoctitle='+MMdoctitle+"",
        "width", "100%",
        "height", "100%",
        "align", "middle",
        "id", "ajax_api",
        "quality", "high",
        "bgcolor", "#869ca7",
        "name", "ajax_api",
        "allowScriptAccess","sameDomain",
        "type", "application/x-shockwave-flash",
        "pluginspage", "http://www.adobe.com/go/getflashplayer"
    );
} else if (hasRequestedVersion) {
    // if we've detected an acceptable version
    // embed the Flash Content SWF when all tests are passed
    AC_FL_RunContent(
            "src", "ajax_api",
            "width", "100%",
            "height", "100%",
            "align", "middle",
            "id", "ajax_api",
            "quality", "high",
            "bgcolor", "#869ca7",
            "name", "ajax_api",
            "allowScriptAccess","sameDomain",
            "type", "application/x-shockwave-flash",
            "pluginspage", "http://www.adobe.com/go/getflashplayer"
    );
  } else {  // flash is too old or we can't detect the plugin
    var alternateContent = 'Alternate HTML content should be placed here. '
    + 'This content requires the Adobe Flash Player. '
    + '<a href=http://www.adobe.com/go/getflash/>Get Flash</a>';
    document.write(alternateContent);  // insert non-flash content
  }
// -->
</script>
<noscript>
    <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
            id="ajax_api" width="100%" height="100%"
            codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab">
            <param name="movie" value="ajax_api.swf" />
            <param name="quality" value="high" />
            <param name="bgcolor" value="#869ca7" />
            <param name="allowScriptAccess" value="sameDomain" />
            <embed src="ajax_api.swf" quality="high" bgcolor="#869ca7"
                width="100%" height="100%" name="ajax_api" align="middle"
                play="true"
                loop="false"
                quality="high"
                allowScriptAccess="sameDomain"
                type="application/x-shockwave-flash"
                pluginspage="http://www.adobe.com/go/getflashplayer">
            </embed>
    </object>
</noscript>
</body>
</html>
Foi útil?

Solução

Isso é porque google.language.transliterate não é uma operação síncrona. Sua função initialize retornos mesmo antes google.language.transliterate tem running acabado (que é por isso que você está anexando uma função callback para executar depois que é feito).

Você precisa callback uma função do ActionScript após transliterate é feito. Explorar ExternalInterface.addCallback () para adicionar uma função do ActionScript que pode ser chamado de javascript.

Outras dicas

A chamada para google.language.transliterate no código JavaScript é assíncrona, por isso parece que você tem que pressionar o botão duas vezes. A função anônima que é passado como o quarto argumento não for executado até que alguns dados foram carregados.

Talvez você deve mostrar algum tipo de indicador de carregamento antes de chamar google.language.transliterate e depois escondê-lo no manipulador? Dessa forma, você veria quando do carregamento de dados.

Você pode criar um arquivo html usando o script eo uso que dentro do componente Flex HTML.

Exemplo: 

<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:HTML id="html"
        width="100%"
        height="100%"
        location="{serverIp}/Translit.html"/>
</mx:WindowedApplication>

Obrigado rapazes, funcionou. Estou anexando o código de trabalho aqui:

código

Flex: ( ajax_api.mxml ) 

<?xml version="1.0" encoding="utf-8"?>
    <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
        <mx:TextArea x="209" y="139" height="245" width="318"  id="text1" fontSize="28"/>
        <mx:Script>
            <![CDATA[
                import mx.rpc.events.ResultEvent;
        import flash.external.*;

         public function callWrapper():void {
            var s:String;
            if (ExternalInterface.available) {
       ExternalInterface.addCallback("g", g);
               var wrapperFunction:String = "initialize";
               ExternalInterface.call(wrapperFunction,text1.text);

            } else {
               s = "Wrapper not available";
            }
            trace(s); 
         }
         public function g(str:String):void
         {
            text1.text = str;
         }

                ]]>
        </mx:Script>
        <mx:Button x="75" y="50" label="Enter some text and click this button to see the transliteration output" click="callWrapper()" height="37"/>
    </mx:Application>

HTML Wrapper: 

<!-- saved from url=(0014)about:internet -->
<html lang="en">

<!-- 
Smart developers always View Source. 

This application was built using Adobe Flex, an open source framework
for building rich Internet applications that get delivered via the
Flash Player or to desktops via Adobe AIR. 

Learn more about Flex at http://flex.org 
// -->

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<!--  BEGIN Browser History required section -->
<link rel="stylesheet" type="text/css" href="history/history.css" />
<!--  END Browser History required section -->

<title>ajax_api</title>
<script src="AC_OETags.js" language="javascript"></script>

<!--  BEGIN Browser History required section -->
<script src="history/history.js" language="javascript"></script>
<!--  END Browser History required section -->

<style>
body { margin: 0px; overflow:hidden }
</style>
<script language="JavaScript" type="text/javascript">
<!--
// -----------------------------------------------------------------------------
// Globals
// Major version of Flash required
var requiredMajorVersion = 9;
// Minor version of Flash required
var requiredMinorVersion = 0;
// Minor version of Flash required
var requiredRevision = 28;
// -----------------------------------------------------------------------------
// -->
</script>
</head>

<body scroll="no">
      <script type="text/javascript" src="http://www.google.com/jsapi"></script>
    <script type="text/javascript">

    google.load("language", "1");
function thisMovie(movieName)
{

    if(navigator.appName.indexOf("Microsoft")!=-1)
    {
        alert("microsoft");
        return window[movieName];
    }
    else
    {
        return document[movieName];
    }
}

function initialize(input) {
      google.language.transliterate([input], "en", "hi", function(result) {
        if (!result.error) {
          var container = document.getElementById("transliteration");
          if (result.transliterations && result.transliterations.length > 0 &&
            result.transliterations[0].transliteratedWords.length > 0) {
            output = result.transliterations[0].transliteratedWords[0];
        thisMovie("ajax_api").g(output);
          }
        }
      });
    }

    </script>
    <script language="JavaScript" type="text/javascript">
<!--
// Version check for the Flash Player that has the ability to start Player Product Install (6.0r65)
var hasProductInstall = DetectFlashVer(6, 0, 65);

// Version check based upon the values defined in globals
var hasRequestedVersion = DetectFlashVer(requiredMajorVersion, requiredMinorVersion, requiredRevision);

if ( hasProductInstall && !hasRequestedVersion ) {
    // DO NOT MODIFY THE FOLLOWING FOUR LINES
    // Location visited after installation is complete if installation is required
    var MMPlayerType = (isIE == true) ? "ActiveX" : "PlugIn";
    var MMredirectURL = window.location;
    document.title = document.title.slice(0, 47) + " - Flash Player Installation";
    var MMdoctitle = document.title;

    AC_FL_RunContent(
        "src", "playerProductInstall",
        "FlashVars", "MMredirectURL="+MMredirectURL+'&MMplayerType='+MMPlayerType+'&MMdoctitle='+MMdoctitle+"",
        "width", "100%",
        "height", "100%",
        "align", "middle",
        "id", "ajax_api",
        "quality", "high",
        "bgcolor", "#869ca7",
        "name", "ajax_api",
        "allowScriptAccess","sameDomain",
        "type", "application/x-shockwave-flash",
        "pluginspage", "http://www.adobe.com/go/getflashplayer"
    );
} else if (hasRequestedVersion) {
    // if we've detected an acceptable version
    // embed the Flash Content SWF when all tests are passed
    AC_FL_RunContent(
            "src", "ajax_api",
            "width", "100%",
            "height", "100%",
            "align", "middle",
            "id", "ajax_api",
            "quality", "high",
            "bgcolor", "#869ca7",
            "name", "ajax_api",
            "allowScriptAccess","sameDomain",
            "type", "application/x-shockwave-flash",
            "pluginspage", "http://www.adobe.com/go/getflashplayer"
    );
  } else {  // flash is too old or we can't detect the plugin
    var alternateContent = 'Alternate HTML content should be placed here. '
    + 'This content requires the Adobe Flash Player. '
    + '<a href=http://www.adobe.com/go/getflash/>Get Flash</a>';
    document.write(alternateContent);  // insert non-flash content
  }
// -->
</script>
<noscript>
    <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
            id="ajax_api" width="100%" height="100%"
            codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab">
            <param name="movie" value="ajax_api.swf" />
            <param name="quality" value="high" />
            <param name="bgcolor" value="#869ca7" />
            <param name="allowScriptAccess" value="sameDomain" />
            <embed src="ajax_api.swf" quality="high" bgcolor="#869ca7"
                width="100%" height="100%" name="ajax_api" align="middle"
                play="true"
                loop="false"
                quality="high"
                allowScriptAccess="sameDomain"
                type="application/x-shockwave-flash"
                pluginspage="http://www.adobe.com/go/getflashplayer">
            </embed>
    </object>
</noscript>
</body>
</html>
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