Hi there,
I have a problem trying to call an existing javascript method that
takes a javascript Array as parameter and checks the type of the input
parameter. When I pass a javascript Array created in a JSNI method to
the existing method it doesn't preserve it's Array type, so the type
check fails.
Here's some code to examplify. Consider I have the javascript legacy
function MyFunction that is in MyFunctions.js and I have included that
in my module correctly.
function MyFunction(a){
if(a instanceof Array){
alert("Hooray, I am an Array")
//normally logic would be here
} else {
alert("No way, I am not an Array");
//normally error if input is not array
}
}
Now, I want to call this method using JSNI, so I wrap it in
JMyFunction, like this :
public static native void JMyFunction() /*-{
var myArray = new Array();
myArray[0] = "hello"
if(myArray instanceof Array){
$wnd.alert("Array is Array")}
else{
$wnd.alert("Array is not Array")
}
$wnd.MyArrayTest(myArray);
}-*/;
Calling JMyFunction lets two alert boxes pop up, respectively with the
text:
Array is Array
No way, I'm not an array
This is because myArray is no longer an Array once passed into
MyFunction, but an Object. I can also check that with Firebug when
generating detailed output.
Does anybody know a smart workaround for this problem?
I've read the following discussing:
http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/20871a328695ffee/90fb836f1e9ecc95#
The "solution" by Scott Blum does not work in my case. I can put all
JavaScriptObjects in a JavaScriptObject that is a javascript Array and
then pass that as an Array, but it will just as myArray in my example
script, not be preserved as an Array when it arrives at the legacy
javascript function (the code example above is probably clearer than
my attempt at this explanation).
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