html - form 表单 用户名提示和错误提示分开显示？

Question

点击输入框，显示用户名提示，点击立即注册按钮，在输入框下显示错误提示

<form class="form-horizontal" name="checkForm" ng-init="isEmpty=false;">
    <p class="form-group">
        <label class="col-sm-3 control-label">用 户 名</label>
        <p class="col-sm-8 account">
            <input type="text" class="form-control showHide" placeholder="您的账户名和登录名"
                ng-model="account"
                name="account"
                required="required"
                ng-pattern="regularList.account"
                ng-blur="checkForm.account.$blured = false;"
                ng-focus="checkForm.account.$blured = true;"
                autocomplete="off"/>
            <span ng-class="{'right':(checkForm.account.$error.pattern),'error':checkForm.account.$valid}"></span>
        </p>
        <span ng-messages="isEmpty && checkForm.account.$blured && checkForm.account.$error" role="alert">
            <span class="error_text" ng-message="required" style="color: #ff0000">用户名不能为空</span>
        </span>
        <span ng-messages="checkForm.account.$blured && checkForm.account.$error" role="alert">
            <span class="error_text" ng-message="pattern"style="color: #ff0000">用户名为4-20位中文数字与英文字母组成！</span>
        </span>
    </p>
    <p class="tip-container" ng-if="checkForm.account.$blured==true">
        <p class="input-tip" ng-show="checkForm.account.$blured">
            <i></i>
            <span>!支持中文、字母、数字、“-”“_”的组合，4-20个字符</span>
        </p>
    </p>

具体效果如下

现在是输入内容不希望显示错误提示
我现在的问题是，输入相应的内容，会有错误的提示，效果见下

目的：输入内容不提示错误，点击立即注册，如果不符合相应的规范，再提示错误。
求指点，谢谢

Answer 1

Also drunk. . .
<input type="text" class="form-control showHide" placeholder="Your account name and login name"

            ng-model="account"
            ng-pattern="regularList.account"/>

<span ng-show="showAccountError" role="alert">

        <span class="error_text" style="color: #ff0000">用户名为4-20位中文数字与英文字母组成！</span>

</span>
When the user submits, use regular expressions in the controller to determine whether $scope.account is legal. If it is not legal, set $scope.showAccountError=true. Set false to this variable when the page is initialized.