<span class="label">
            User Name
            <i class="fa"
               ng-class="{'fa-exclamation-triangle': as.vloginUserName(as.forms.login.loginUserName) != 'OK'}"
               title="{{ as.vloginUserName(as.forms.login.loginUserName) }}"></i>
        </span>
        <input class="w15r"
               id="loginUserName"
               name="loginUserName"
               ng-change="as.clearRegisterData()"
               ng-model="as.loginUserName"
               ng-minlength="3"
               type="text"
               value="" />

vloginUserName = function (field) {
    if (angular.isDefined(field)) {
        if (field.$error.minlength) return "Minimum Length 5";
    }
    return "OK";
}