Flash CS4 pass variable from javascript function to actionscript and back

Question

I want to pass the result of a js function into actionscript when the js function is called from actionscript. The js parses a url and returns the var in the url. In actionscript the functions are declared:

function gup(name1:String) :void {
flash.external.ExternalInterface.call("gup", name1);

}

function printAlert(group2:String) :void {
flash.external.ExternalInterface.call("printAlert", group2);

}

then later in actions I call gup() which should return the var which I turn around and print as an alert to check what value is there. "group" is the name of the var I want to get out of the url to use for branching in the swf. If I just define whichGroup the alert works fine. trying to get the return value of the js function the alert value is null

var whichGroup = gup("group");

printAlert(whichGroup);

Are printAlert and gup functions defined in the javascript? Your functions doesn't seem to handle the return value of js functions at all — Amarghosh
– Amarghosh, Commented Sep 1, 2010 at 4:12

Amarghosh · Accepted Answer · 2010-09-01 04:16:12Z

1

ActionScript

function printAlert(group2:String):void {
    var retValue:String = ExternalInterface.call("printAlert", group2);
    trace(retValue);
}

javascript:

function printAlert(grp) {
   return "Received group " + grp;
}

answered Sep 1, 2010 at 4:16

Amarghosh

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1 Comment

palito Over a year ago

Thanks. I got it working with something very similar. function printAlert(group:String) :void { flash.external.ExternalInterface.call("printAlert", group); } Using var retData:String = ExternalInterface.call("gup","group"); in later frame javascriptfunction gup is a function that has a regular expression to get the vars out of a url printAlert(group){ alert("grouppa=" + group); }

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