我找不到如何检查大于0的值，因为<!DOCTYPE html>
<!--
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<html>
<head>
<title>Tuition Hub</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link type="text/png" rel="icon" href=""/>
<style>
#page{
background-image: linear-gradient(to right,#2E74FA 10%,#59C2F9 90%);
}
#main {
border:1px;
border-radius:100px;
margin:50px 100px;
background-color:white;
}
.image{
border-radius:50px 0px 0px 50px;
height:500px;
width:50%;
float:left;
background-color:white;
}
.form{
border-radius:0px 50px 50px 0px;
height:500px;
width:50%;
float:right;
background-color:white;
}
#input{
width:89%;
background-color:#E6E6E6;
padding:15px;
margin:10px;
border: 0px;
border-radius:100px;
}
#select{
width:62%;
background-color:#E6E6E6;
padding:15px;
margin:10px;
border: 0px;
border-radius:100px;
}
#check{
font-size:44px;
color: blue;
}
input:focus {
background-color:aqua;
}
.submit{
color:white;
background-color:limegreen;
padding:10px;
border:0px;
border-radius:100px;
}
.img{
height:500px;
width:400px;
}
</style>
</head>
<body id="page">
<div id="main">
<div class="image">
<img src="\images\tuition_hub.jpg" class="img">
</div>
<div class="form">
<form action="Fee_Calculator" method ="get">
<H3><B><center>Get estimated fees</center></B></H3>
<input type="text" name="fname" placeholder="Name" id="input" style="margin-top:0px"><br>
<input type="email" name="email" placeholder="Email" id="input"><br>
Select Your Board : <select name="board" id="select"><br>
<option value="ICSE" />ICSE
<option value="CBSE"/>CBSE
</select><br>
Select Your Class : <select name="class" id="select"><br>
<option value="2" id="select"/>2
<option value="3" id="select"/>3
<option value="4" id="select"/>4
<option value="5" id="select"/>5
<option value="6" id="select"/>6
<option value="7" id="select"/>7
<option value="8" id="select"/>8
<option value="9" id="select"/>9
</select><br>
Select your Subjects :<br>
<input type="checkbox" name="Maths" id="check" value="on">Maths
<input type="checkbox" name="Science" id="check" value="on">Science<br>
<input type="checkbox" name="English" id="check" value="on">English
<input type="checkbox" name="Social Studies" id="check" value="on">Social Studies<br>
<center><input type="submit" value="CHECK" class="submit"></center>
</form>
</div>
</div>
</body>
</html>
也接受0，但是如果使用import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author NEGI PC
*/
@WebServlet(urlPatterns = {"/Fee_Calculator"})
public class Fee_Calculator extends HttpServlet {
String name,email,board,sub1,sub2,sub3,sub4;
int sclass,fee;
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
name = request.getParameter("fname");
email = request.getParameter("email");
board = request.getParameter("board");
sub1 = request.getParameter("Maths");
sub2 = request.getParameter("Science");
sub3 = request.getParameter("English");
sub4= request.getParameter("Social Studies");
sclass= Integer.parseInt(request.getParameter("class"));
if(board.equals("ICSE")){
switch(sclass){
case 2 :
if(sub1.equals("on")){
fee+=200;
}
if(sub2.equals("on")){
fee+=200;
}
if(sub3.equals("on")){
fee+=200;
}
if(sub4.equals("on")){
fee+=200;
}
break;
case 3 :
if(sub1.equals("on")){
fee+=250;
}
if(sub2.equals("on")){
fee+=250;
}
if(sub3.equals("on")){
fee+=250;
}
if(sub4.equals("on")){
fee+=250;
}
break;
case 4 :
if(sub1.equals("on")){
fee+=250;
}
if(sub2.equals("on")){
fee+=250;
}
if(sub3.equals("on")){
fee+=250;
}
if(sub4.equals("on")){
fee+=250;
}
break;
case 5 :
if(sub1.equals("on")){
fee+=300;
}
if(sub2.equals("on")){
fee+=300;
}
if(sub3.equals("on")){
fee+=300;
}
if(sub4.equals("on")){
fee+=300;
}
break;
case 6 :
if(sub1.equals("on")){
fee+=350;
}
if(sub2.equals("on")){
fee+=350;
}
if(sub3.equals("on")){
fee+=350;
}
if(sub4.equals("on")){
fee+=350;
}
break;
case 7 :
if(sub1.equals("on")){
fee+=400;
}
if(sub2.equals("on")){
fee+=400;
}
if(sub3.equals("on")){
fee+=400;
}
if(sub4.equals("on")){
fee+=400;
}
break;
case 8 :
if(sub1.equals("on")){
fee+=500;
}
if(sub2.equals("on")){
fee+=450;
}
if(sub3.equals("on")){
fee+=450;
}
if(sub4.equals("on")){
fee+=450;
}
break;
case 9 :
if(sub1.equals("on")){
fee+=500;
}
if(sub2.equals("on")){
fee+=450;
}
if(sub3.equals("on")){
fee+=450;
}
if(sub4.equals("on")){
fee+=450;
}
break;
default:
out.println("WRONG INPUT !!!");
}
}
else{
//For option CBSE , Not created yet!!
}
out.println("<h2>Your Estimated fees => Rs."+fee);
out.println("<br> For more Details ,Consult the Tutor!!!</h2>");
fee=0;
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
，那么0和1之间的任何十进制也将不被接受。
我也不知道为什么我不能使用下面的数据/为maxValue计算的变量。如果我使用minValue(0)，它可以工作，但是我需要它是动态的。
minValue(1)答案 0 :(得分：1)
我相信在这种情况下，您的validations应该是一个函数，而不是对象。
validations() {
return {
form: {
amount: { maxValue: maxValue(this.maxValue) }
}
}
}
您可以在此处找到相关示例：https://vuelidate.netlify.com/#sub-dynamic-parameters
-编辑-
关于大于0的值，复制自我的评论：
我不确定，但是似乎没有针对这种情况的内置验证器。您可以编写自己的验证器，看起来或多或少像这样：
const greaterThanZero = (value) => value > 0
validations() {
form: {
amount: {
maxValue: greaterThanZero
}
}
}
或者您可以使用minValue（0.00000001）作为解决方法自定义验证器也可以采用参数，因此您可以编写比将采用动态值的自定义验证器大的代码（相关文档：https://vuelidate.netlify.com/#sub-extra-parameters）