Grokking angular by claims

directives.md

• ng-submit * only makes sense on a <form> tag * is just an event handler much like ng-click
• ng-options * only makes sense on a <select> tag * enables us to have objects as selected values instead of just strings * saves us from having to type out <options ng-repeat="..." ... /> * provides additional shortcut for <optgroup> through :groupBy
• ng-click

• should always be a method call, don't do assignments as that relies on brittle scoping and is hard to test
  

• the above is less true if you aren't using scope but instead `ng-controller=SomeController as some` and can explicitly assign to a variable in that scope like `ng-click="some.aVariable = someValue"`.
  

• inside an `ng-repeat` will commonly mean passing the `ng-repeat` variable to the callback
  

• ng-class

• is a shorthand to conditionally set css classes
  

• looks like `ng-class="{classname: cond, classname: cond, ...}"`