I am a developer and (at least as often) a (l)user. UI and UX design are important from both perspectives, and it’s important to bear this in mind whilst creating any application. What is this waffle all about? There are some platforms, based in yonder cloud that could tweak the tiniest of features, and make the lives of their users (and administrators) 1 x shed-load better. Until they do that, we’re gonna have to do it ourselves.
Let’s get specific. Typically, validation error messages provided by Apex and VisualForce are only apparent after form is submitted ( or when we’re on the last page of a 39-page wizard ). Of course some cases require that it be this way, but for other cases it’s like my (very) old professor used to say, “Jus’ don’t let em make the mistake in the first place boy *tongue-click*”. Heeding Prof. Swart’s advice, let’s see how we can easily do this.