登录时，当用户名或密码一项为空时，怎么弹出提示框提示用户，两项都添加后再进行提交操作
日期：2014-05-18 浏览次数：20682 次
登录时，当用户名或密码一项为空时，如何弹出提示框提示用户，两项都添加后再进行提交操作？
一下是代码，应如何添加？
<%@ taglib uri= "/WEB-INF/struts-tiles.tld " prefix= "tiles " %>
<%@ taglib uri= "/WEB-INF/struts-nested.tld " prefix= "nested " %>
<%@ taglib uri= "/WEB-INF/struts-logic.tld " prefix= "logic " %>
<%@ taglib uri= "/WEB-INF/struts-template.tld " prefix= "template " %>
<%@ taglib uri= "/WEB-INF/struts-bean.tld " prefix= "bean " %>
<%@ taglib uri= "/WEB-INF/struts-html.tld " prefix= "html " %>
<%@ page contentType= "text/html; charset=GBK " %>
<html:html xhtml= "true " locale= "true ">
<head>
<title>
login.jsp
</title>
<html:base/>
</head>
<body>
<h1> h1>
<p>
<html:form action= "/loginAction.do " method= "POST ">
<html:text property= "username "/>
<br>
<html:password property= "password "/>
<br>
<html:submit property= "submit " value= "Submit "/> <br>
<html:reset value = "Reset "/>
</html:form>
</body>
</html:html>
------解决方案--------------------
<%@ taglib uri= "/WEB-INF/struts-tiles.tld " prefix= "tiles " %>
<%@ taglib uri= "/WEB-INF/struts-nested.tld " prefix= "nested " %>
<%@ taglib uri= "/WEB-INF/struts-logic.tld " prefix= "logic " %>
<%@ taglib uri= "/WEB-INF/struts-template.tld " prefix= "template " %>
<%@ taglib uri= "/WEB-INF/struts-bean.tld " prefix= "bean " %>
<%@ taglib uri= "/WEB-INF/struts-html.tld " prefix= "html " %>
<%@ page contentType= "text/html; charset=GBK " %>
<html:html xhtml= "true " locale= "true ">
<head>
<title>
login.jsp
</title>
<html:base/>
</head>
<body>
<script type= "text/javascript "> -------------------------------增加的
function submit1()
{
if(za.aa.value== " "){
alert( "请输入发送信息内容 ");
za.aa.focus();
return false;
}
}
</script>
<h1> </h1>
<p>
<html:form action= "/loginAction.do " name= "za " method= "POST ">
<html:text name= "aa " property= "username "/>
<br>
<html:password property= "password "/>
<br>
<html:submit property= "submit " onclick= "return submit1() " value= "Submit "/> <br> ----增加的submit1() "
<html:reset value = "Reset "/>
</html:form>
</body>
</html:html>
------解决方案--------------------
function check() {
var usernameText = document.getElementsByName( "username ")[0];
var passwordText =
一下是代码，应如何添加？
<%@ taglib uri= "/WEB-INF/struts-tiles.tld " prefix= "tiles " %>
<%@ taglib uri= "/WEB-INF/struts-nested.tld " prefix= "nested " %>
<%@ taglib uri= "/WEB-INF/struts-logic.tld " prefix= "logic " %>
<%@ taglib uri= "/WEB-INF/struts-template.tld " prefix= "template " %>
<%@ taglib uri= "/WEB-INF/struts-bean.tld " prefix= "bean " %>
<%@ taglib uri= "/WEB-INF/struts-html.tld " prefix= "html " %>
<%@ page contentType= "text/html; charset=GBK " %>
<html:html xhtml= "true " locale= "true ">
<head>
<title>
login.jsp
</title>
<html:base/>
</head>
<body>
<h1> h1>
<p>
<html:form action= "/loginAction.do " method= "POST ">
<html:text property= "username "/>
<br>
<html:password property= "password "/>
<br>
<html:submit property= "submit " value= "Submit "/> <br>
<html:reset value = "Reset "/>
</html:form>
</body>
</html:html>
------解决方案--------------------
<%@ taglib uri= "/WEB-INF/struts-tiles.tld " prefix= "tiles " %>
<%@ taglib uri= "/WEB-INF/struts-nested.tld " prefix= "nested " %>
<%@ taglib uri= "/WEB-INF/struts-logic.tld " prefix= "logic " %>
<%@ taglib uri= "/WEB-INF/struts-template.tld " prefix= "template " %>
<%@ taglib uri= "/WEB-INF/struts-bean.tld " prefix= "bean " %>
<%@ taglib uri= "/WEB-INF/struts-html.tld " prefix= "html " %>
<%@ page contentType= "text/html; charset=GBK " %>
<html:html xhtml= "true " locale= "true ">
<head>
<title>
login.jsp
</title>
<html:base/>
</head>
<body>
<script type= "text/javascript "> -------------------------------增加的
function submit1()
{
if(za.aa.value== " "){
alert( "请输入发送信息内容 ");
za.aa.focus();
return false;
}
}
</script>
<h1> </h1>
<p>
<html:form action= "/loginAction.do " name= "za " method= "POST ">
<html:text name= "aa " property= "username "/>
<br>
<html:password property= "password "/>
<br>
<html:submit property= "submit " onclick= "return submit1() " value= "Submit "/> <br> ----增加的submit1() "
<html:reset value = "Reset "/>
</html:form>
</body>
</html:html>
------解决方案--------------------
function check() {
var usernameText = document.getElementsByName( "username ")[0];
var passwordText =
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