AngularJs 禁止用户输入input，阻止事件运作

<div class="form-group">
                  <lable class="add-on">证件类型</lable>
                  <span class="right-add-on sl-icon-mobile-lock"></span>
                  <input type="text" name="idCardTxt" class="form-control" placeholder="身份证" maxlength="0"
                         ng-keypress="$event.preventDefault()" ng-paste="$event.preventDefault()" onfocus="idCardTxt.blur()">
                </div>