Angular Validation Example

<div class="col-sm-5" ng-class="{ 'has-error' : (inspectForm.controlNum.$invalid && !inspectForm.controlNum.$pristine) || inspect.controlNum < 0}">
    <input type="number" class="form-control input-sm" placeholder="관리번호" ng-model="inspect.controlNum" name="controlNum" required>
    <span ng-show="inspectForm.controlNum.$error.required && !inspectForm.controlNum.$pristine " class="help-block">관리번호를 입력해 주세요</span>
    <span ng-show="(inspectForm.controlNum.$invalid && !inspectForm.controlNum.$pristine) || inspect.controlNum < 0" class="help-block">관리번호는 0보다 작을 수 없습니다</span>
</div>