处理Flex页面的后退、前进、刷新、关闭事件

1. 在 index.template.html 中增加javascript

<script language=”JavaScript” type=”text/javascript”>

window.onbeforeunload = onbeforeunload_handler;  

function onbeforeunload_handler()   

{  

    var warning="";

 

    var fxControl = document.${application} || window.${application};   

    if ( fxControl )  

        if ( typeof fxControl.getUnsavedDataWarning=="function")   

            warning = fxControl.getUnsavedDataWarning();    // This calls a function in our Flex app  

      

    if ( warning != '' )   

        return warning;  

    else   

        return void(0);   

}

 

window.onunload = function()   

{  

    var fxControl = document.${application} || window.${application};  

    if ( fxControl )  

        if ( typeof fxControl.javascriptOnUnload=="function")   

           fxControl.javascriptOnUnload();  // This calls a function in our Flex app  

}  

</script>

 

2.在 Flex 的 application 页面里加增一个addCallback, 在页面加载完后就addCallback:

private const UNSAVED_DATA_WARNING:String = 'You have unsaved changes. You will lose them if you continue.';  

              

    private function onCreationComplete():void {  

        ExternalInterface.addCallback("getUnsavedDataWarning",  

            function():String {  

                return UNSAVED_DATA_WARNING;  

            }  

        );  

    }