Issue with calling instance method from handwritten javascript

Question

Can anyone help with what is wrong in the code below(based on the answers to a similar question asked on SO):

    public String javaMethod(String input) {
        return "it works";
}

    public native void defineBridgeMethod() /*-{ 
        var that = this;
        $wnd.jsFunction= $entry(function(msg) {
                 [email protected]::javaMethod(Ljava/lang/String;)(msg)
            });
    }-*/;

The issue is that Javascript does not find jsFunction: alert(jsFunction) in Javascript code returns 'undefined'.

Thanks.

Edit: Huh, one hour later: figured out that I just needed to have that.@com... returned!

So your question is answered? If so, answer your own question please. — Peter
– Peter, Commented Mar 13, 2012 at 14:17

srini1998 · Accepted Answer · 2012-03-15 23:40:03Z

2

Huh, one hour later: figured out that I just needed to have that.@com... returned!

The bridge method should be:

public native void defineBridgeMethod() /*-{ 
    var that = this;
    $wnd.jsFunction= $entry(function(msg) {
             return [email protected]::javaMethod(Ljava/lang/String;)(msg)
        });
}-*/;

answered Mar 15, 2012 at 23:40

srini1998

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2 Comments

Dr. Max Völkel Over a year ago

I don't get what "var this = that" really does, but it works - while this.@... does not.

PAX Over a year ago

It has something to do with scoping. this within that function is another one than outside the function. You circumvent that by assigning the outer this to a variable which is also "visible" within the function statement.

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