modify inputField to support error state

[dgoldstein1]

Component:

Will this modification effect the existing functionality?

• no modification or deleting of current functionality

Describe your proposed change

• add prop errorText to inputField to show invalid entry
• should highlight the box red like the required prop
• should display red text under the field

[shanberg]

I’m thinking we should define a few validation states for all the form components, and have InputField pass that down as a prop to the InputTextField and whatever other children.

Style for those validation states would be handled in the hintText and InputTextField components individually.

I’m also thinking instead of hintText, we should have help, and that help should be a node, not a string, so that we can include any help text and validation language when necessary, as well as icon like a warning triangle if in error.