ng-blur, ng-focus
HTML
<div ng-app
ng-init="focus=false;blur=false;active=false">
<input type="text"
ng-class="{ myFocus: focus, myBlur: blur }"
ng-focus="focus=true;blur=false;"
ng-blur="blur=true;focus=false;">
<p>focus: {{focus}}</p>
<p>blur: {{blur}} </p>
</div>
CSS
input[type="text"].myFocus {
background-color: yellow;
}
input[type="text"].myBlur {
background-color: red;
}