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;  
            }  
        );  
    }