Js与flash交互：在html页面中用js与MyReport插件交互

Html页面与flash的加载

如下图，flash是html页面的一个插件节点。

js与flash进行交互，首先要处理好html页面和swf的加载问题。

Swf调用外部js方法，要确保js方法已存在，该条件一般都满足，因为swf加载比页面js慢。

Js访问swf的接口时，要确保swf已经加载完成，该条件则需要做特殊的处理。

如何做？

可以想到的是，只有flash插件本身才知道自己是否加载完成，所以，需要flash插件在加载完成后要主动的通知外部html页面：“我加载完啦！”，外部html页面收到这个通知后再进行后续的操作。

更复杂的情况是，页面有2次加载数据的场合：要同时保证，页面、flash、数据都加载完成后，在进行后续操作。

 

ExternalInterface类

ExternalInterface类是实现flash外部调用的关键类，其中：

ExternalInterface.available：判断是否允许进行外部调用。

ExternalInterface.addCallback：注册外部访问flash的方法（js 2 flash）。

ExternalInterface.call：flash内部调用外部方法（flash 2 js）。

关于该类的更多信息请查看帮助文档。

 

向MyReport插件增加js访问的接口

MyReportApp.swf在加载完成后会主动调用页面的js方法onMyReportInitialized；关闭时主动调用js方法onMyReportClosed；打印时主动调用js方法onMyReportPrinted。

注册了一个loadReport方法可以让页面js进行调用。

以下是MyReportApp的flex代码

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

                           xmlns:myreport="myreport.*"

                           minWidth="800" minHeight="600" backgroundColor="0xffffff" creationComplete="Init()"

                           fontFamily="Simsun" layout="horizontal" paddingBottom="0" paddingLeft="0"

                           paddingRight="0" paddingTop="0">

       <mx:Style source="Index.css"/>

       <mx:Script>

              <![CDATA[

                     import mx.collections.ArrayCollection;

                     import mx.events.CloseEvent;

                     import myreport.MyReportEvent;

                     import myreport.ReportEngine;

                     import myreport.ReportViewer;

                     import myreport.export.ExportEvent;

 

                     private function Init():void

                     {

                           //注册关闭事件

                           _Report.addEventListener(CloseEvent.CLOSE, OnClose);

                           //注册导出事件

                           _Report.addEventListener(ExportEvent.EXPORT, OnExport);

                           //注册打印事件

                           ReportEngine.AddEventListener(myreport.MyReportEvent.PRINT, OnPrint);

                           AddExtInterface();

                           OnMyReportInitialized();

                     }

                     private function OnClose(event:CloseEvent):void

                     {

                            //处理关闭事件

                           OnMyReportClosed();

                     }

                     private function OnPrint(event:MyReportEvent):void

                     {

                           //处理打印事件

                           OnMyReportPrinted();

                     }

                     private function OnExport(event:ExportEvent):void

                     {

                           var file:FileReference;

                           if(event.FileType == ExportEvent.FILE_TYPE_PDF)

                           {

                                  file = new FileReference();

                                  //保存到本地，该方法要Flash player 10以上

                                  file.save(event.Bytes, "Export1.pdf");

                           }

                           else if(event.FileType == ExportEvent.FILE_TYPE_XLS)

                           {

                                  file = new FileReference();

                                  //保存到本地，该方法要Flash player 10以上

                                  file.save(event.Bytes, "Export1.xls");

                           }

                     }

                     private function AddExtInterface():void

                     {

                           if(ExternalInterface.available)

                           {

                                  ExternalInterface.addCallback("loadReport", LoadReport);

                           }

                     }

                     //==============定义外部访问接口====================

                     /**

                      * 加载完成时调用，通知外部初始化加载已完成

                      * (主动调用)

                      */

                     private function OnMyReportInitialized():Object

                     {

                           if(!ExternalInterface.available)

                                  return 0;

                           return ExternalInterface.call("onMyReportInitialized");

                     }

                     /**

                      * 关闭时调用，通知外部点击了关闭按钮

                      * (主动调用)

                      */

                     private function OnMyReportClosed():Object

                     {

                           if(!ExternalInterface.available)

                                  return 0;

                           return ExternalInterface.call("onMyReportClosed");

                     }

                     /**

                      * 打印时调用，通知外部执行了打印功能

                      * (主动调用)

                      */

                     private function OnMyReportPrinted():Object

                     {

                           if(!ExternalInterface.available)

                                  return 0;

                           return ExternalInterface.call("onMyReportPrinted");

                     }

                     /**

                      * 加载报表和数据

                      * (被动调用，必须在onMyReportInitialized执行后调用)

                      */

                     private function LoadReport(url:String, params:Object, table:Array):void

                     {

                           _Report.Load(url, new ArrayCollection(table), params);

                     }

              ]]>

       </mx:Script>

       <myreport:ReportViewer id="_Report" width="100%" height="100%">

       </myreport:ReportViewer>

</mx:Application>

 

在html页面中与MyReportApp.swf交互

MyReportEmbedDemo.html的代码，引入了swfobject.js向页面动态添加flash插件MyReportApp.swf。用jquery控制页面的加载，页面加载后调用onPageLoad方法。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <title>js与flash交互：嵌入MyReport插件示例</title>

    <script type="text/javascript" src="swfobject.js"></script>

    <script type="text/javascript" src="myreport.js"></script>

    <script src="jquery-1.9.1.min.js" type="text/javascript"></script>

    <script type="text/javascript">

        var swfVersionStr = "11.1.0";

        var xiSwfUrlStr = "playerProductInstall.swf";

        var flashvars = {};

        var params = {};

        params.quality = "high";

        params.bgcolor = "#ffffff";

        params.allowscriptaccess = "sameDomain";

        params.allowScriptAccess = "always";

        params.allowfullscreen = "true";

        var attributes = {};

        attributes.id = "MyReportApp";

        attributes.name = "MyReportApp";

        attributes.align = "middle";

        swfobject.embedSWF("MyReportApp.swf", "flashContent", "955px", "600px", swfVersionStr, xiSwfUrlStr, flashvars, params, attributes);

    </script>

    <script type="text/javascript">

        $(document).ready(function () {

            onPageLoad();//该方法在myreport.js实现

        });

    </script>

</head>

 

<body>

<p style=" text-align:center">该示例演示在页面嵌入MyReport插件，使用js与flash插件进行交互</p>

<div id="flashContent">

    <p>

        To view this page ensure that Adobe Flash Player version

        11.1.0 or greater is installed.

    </p>

    <script type="text/javascript">

        var pageHost = ((document.location.protocol == "https:") ? "https://" : "http://");

        document.write("<a href='http://www.adobe.com/go/getflashplayer'><img src='"

                + pageHost + "www.adobe.com/images/shared/download_buttons/get_flash_player.gif' alt='Get Adobe Flash player' /></a>" );

    </script>

</div>

</body>

</html>

 

myreport.js的代码，关键位置加粗显示，页面加载后调用loadReport1调用加载报表方法，传入静态测试数据。

var myReportAPI; //定义MyReport接口对象

var myReportInit = false; //定义MyReport初始化变量

 

//页面加载完成时调用

function onPageLoad(){

    myReportAPI = document.getElementById("MyReportApp");

    loadReport1();

}

function onMyReportInitialized(){

    myReportInit = true;

    //以下是自定义代码

    alert("MyReport初始化。");

    loadReport1();

}

function onMyReportClosed() {

    //以下是自定义代码

    alert("MyReport关闭。");

}

function onMyReportPrinted() {

    //以下是自定义代码

    //alert("MyReport打印。");

}

function myReportLoad(url, params, table) {

    if (!myReportAPI || !myReportInit)

        return;

    myReportAPI.loadReport(url, params, table);

}

 

//自定义加载方法1

function loadReport1() {

    if (!myReportInit)// 要先判断插件是否初始化

        return;

    var url = "xml/ReportStyle1.xml"; //报表路径

    //报表参数数据，这里为了测试方便使用了静态的数据，实际使用时应该向服务端动态请求数据。

    var params = {};

    params["单据编号"] = "KA06417033944";

    params["单据日期"] = new Date();

    params["主标题"] = "销售单";

    params["公司名称"] = "XXXX贸易公司";

    params["经手人"] = "某某某";

    params["公司地址"] = "广州市天河区天河路xx号 xx大厦 xx楼";

    params["公司电话"] = "66866888";

    params["公司"] = { "地址": "广州市天河区天河路xx号 xx大厦 xx楼", "电话": "66866888" };

//报表表格数据，这里为了测试方便使用了静态的数据，实际使用时应该向服务端动态请求数据。

var table = new Array();

    for (var i = 0; i < 25; i++){

        table.push({ID: i, 名称: "商品信息XXX 规格XXX 型号XXX", 数量: i+1, 金额: (i+1)*10, 日期: new Date()});

}

    myReportLoad(url, params, table);

}

 

运行效果图

 

 

如何获取MyReport

MyReport报表引擎下载链接和相关文章索引

 

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