overriding

I have MainComponent that uses ChildComponentA as a @ViewChild . MainComponent is calling a method on ChildComponentA . I want to write an unit test case mocking ChildComponentA . How can I do this using TestBed (in Angular 2 RC5)? Before I used to use overrideDirective(MainComponentName, ChildComponentA, MockChildComponentA); Is there an equivalent to this using TestBed ? I tried using TestBed.overrideComponent(ChildComponentA,{ set: { template: '<div></div>' } }); which just sets the template, but I want to mock the methods in the component as well. I think in this case you can try and

It really bothers me that the pressing the enter key in a Datagrid moves the selection down one item, I'd like to be able to decide what it does in a normal keydown event. So what I did was create a new class that inherits DataGrid and override the OnKeyDown event and use that as my datagrid. This creates a whole new set of problems, since I apparently have to rewrite all the other keypresses (arrow key navigation, shift+arrow key selection, pgup/pgdn, etc..). I've been trying to hack it, but it just seems so pointless spending time rewriting something that has already been written and

I want to validate value before every model save. So, I must override the save function. The code is nearly just the same on, and I want to write it in a mixin class. But failed for I don't know how to write super func. I'm poor of of English, so sorry. class SyncableMixin(object): def save(self, *args, **kwargs): try: res = validate(*args, **kwargs) except Exception: raise ValidateException() super(?, self).save(*args, **kwargs) class SomeModel(SyncableMixin, models.Model): pass You always refer to the current class in a super call. super(SyncableMixin, self).save(*args, **kwargs) This is

Lets say we have alert method of window object. I would like to enhance it with nice alertbox. Also I want to save the existing alert method so that we can switch back once our application is over. Something like this, but its throwing error in firefox console. window.prototype.alert = function(){ } You can; var base = window.alert; window.alert = function(message) { document.getElementById("myalertwidget").innerHTML = message; return base.apply(this, arguments); }; There is no window.prototype object. window is a global object of javascript context and it is not created from the prototype.