Pass function as parameter in Dart

Question

Hello: I need pass a function (event handler) as parameter to other function site in other class:

classB
{
    ClassB(){}
/***/
    load (void onData(Event e))
    {
        ImageElement ie=new ImageElement();
        ie.onLoad.listen( onData );  
        ie.src='hello.png';
    } 

/***/

}

classA
{
    List<ClassB> lcb=new List();

    ClassA(){}
  /****/

    void handler(Event e) {
        /****/
    }

    myFunction() { 
       /***/
        for (var i=0; i < lcb.length; i++)
        {   
            ***
            lcb[i].load( handler );
            ***
        }
       /***/
    }
}

It seems right in principle, but does not work. The function that is passed is never executed. Anyone have any idea what is the correct way?

Answer 1

Looks good and should work especially after your recent update with listen . Why do you expect the ImageElement to fire. You have to assign a src and attach it to the DOM to make it load and fire onload .