【发布时间】：2014-10-08 21:19:47
【问题描述】：
这是一个 Spring Web MVC 项目，我在服务器端进行输入验证。如果有任何错误，则在将其发送到视图之前将其添加到模型中。
控制器
@Controller("resultController")
public class ResultController {
private final ResultService resultService;
@Autowired
public ResultController(ResultService resultService) {
this.resultService = resultService;
}
// @RequestMapping(value = "/search", method = RequestMethod.GET)
@RequestMapping(value ="/template", method = RequestMethod.GET)
public String getPersonList(ModelMap model) {
System.out.println("We are coming into this place");
return "header";
}
@RequestMapping(value = "/number", method = RequestMethod.POST, params = { "regNo" })
public String getStudentResult(@RequestParam(value = "regNo", required = true) String regNo, ModelMap model){
//Server side validation
if(regNo.equals(null) || regNo.isEmpty()){
model.addAttribute("nullValue", "Register Number field cannot be empty");
return "header";
}else if(regNo.length() != 12 ){
System.out.println("This Sys out is shown");
model.addAttribute("invalidLength", new String("invalid"));
return "header";
}else{
model.addAttribute("studentResult",resultService.getStudentResult(regNo));
return "numberResult";
}
}
}
header.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<head>
<script src="http://code.jquery.com/jquery.min.js"></script>
<style>
#mycontainer, h1, h3 {
text-align:center;
}
form {
display:inline-block;
}
/* #regNoErrorMsgNumber {
display: none;
background: brown;
color: white;
} */
</style>
</head>
<body>
<div id="mycontainer">
<form method="post" action="number" id="number">
<!-- <div id="regNoErrorMsgNumber">Only numbers are allowed</div> -->
<div style="text-align: center;" >
<!-- //TODO: Only number, no spaces, no special symbol and 12 digit check-->
<input width="20" type="text" data-validation="numbers" id="regNo" name="regNo" size="30" maxLength="50" placeholder="Enter Register Number"> <b>OR</b>
<div>
<c:if test="${not empty nullValue}">
<c:out value="${nullValue}"/>
</c:if>
<c:if test="${not empty invalidLength}">
<c:out value="Register Number should be 12 digits"/>
</c:if>
</div>
</div>
</form>
<form method="post" action="name" id="name">
<input type="text" id="studentName" name="studentName" size="30" maxLength="50" placeholder="Enter Student Name"></input>
</form>
</div>
<div style="text-align: center;">
<input id="inputFields" type="button" value="Search" />
</div>
<!-- </form> -->
<script>
$(document).ready(function(){
$('#inputFields').click(function(event){
if (document.getElementById('regNo').value !=""){
$("#number").submit();
}else if(document.getElementById('studentName').value !=""){
$("#name").submit();
}
});
});
</script>
</body>
jsp中下面这段jstl代码不起作用
<c:if test="${not empty invalidLength}">
<c:out value="Register Number should be 12 digits"/>
</c:if>
另外，如果我使用没有c:if 标记的c:out 语句，那么它可以工作。但它错位了 UI 中的两个输入字段。在jsp中可以看到divmycontainer代码。我希望错误消息显示在regNo 输入字段下方，但同时regNo 和studetnName 输入字段应该在一行中居中对齐。
PS：我得到了Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core". Try increasing the version of the Dynamic Web Module project facet, as this method of reference may not be supported by the current JSP version (1.1).，但c:out 被c:if 包裹的标签有效。
【问题讨论】：
-
@SotiriosDelimanolis 你能帮我解决这个问题吗，拜托。谢谢。
标签： html spring jsp spring-mvc jstl