An example of implementing Ajax to verify usernames
JSP part code:
<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><%@include file="/common/header.jsp"%><title>用户管理</title><script type="text/javascript">function doVerify(){//获取界面的账号var account = $("#account").val();//获取账号后的提示信息文本var accountText = document.getElementById("accountText");//如果账号输入不为空，执行该方法if(account !=""){
$.ajax({
url:"${basePath}nsfw/userAction_verifyAccout.action",//后台查询验证的方法 data:{"user.account": account},//携带的参数 type: "post",
success: function(msg){//根据后台返回前台的msg给提示信息加HTMLif("true" !=msg){// 账号已经存在 accountText.innerHTML = "<font color='red'>抱歉，"+account+"已被注册，请更换！</font>"}else{ // 账号不存在 accountText.innerHTML = "<font color='green'>恭喜，"+account+"可以注册！</font>"}
}
});
}
}</script></head><body class="rightBody"><tr><td class="tdBg" width="200px">帐号：</td><td><s:textfield name="user.account" id="account" onchange="doVerify()"/><span id="accountText"></span></td></tr></body>
Backend code:
public class UserDAOImpl extends BaseDaoImpl<User> implements UserDAO {/** * 校验账号唯一性 */@Overridepublic List<User> findObjectByAccountAndId(String id, String account) {
StringBuilder hqlStr = new StringBuilder("FROM User t WHERE t.account = ?");if (StringUtils.isNotBlank(id)) {
hqlStr.append(" AND t.id=?");
}
Query query = getSession().createQuery(hqlStr.toString());
query.setParameter(0, account);if (StringUtils.isNotBlank(id)) {
query.setParameter(1, id);
} return query.list();
}
Rendering:
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