-1

我有一个问题，它不检查我输入的文本是否只是字母？我真的不知道如何在 jsp 和 Ajax 中编写 javascript？有人可以通过发布一个我可以学习的好链接来提供帮助吗？尤其是使用Ajax调用数据库

这是我现在遇到的问题，我如何检查文本大小是否大于 0

<%@page import="java.util.*,support.*,java.sql.*"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>

<%//javascript file %>
<script>
function allLetter(value)  
{  
 var letters = /^[A-Za-z]+$/;  
 if(inputtxt.value.match(alphaExp))  
   {  
    return true;  
   }  
 else  
   {  
   alert("message");  
   return false;  
   }  
}  
</script>

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Names and country of residence page</title>
</head>
<body>
<%

Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;

    // Registering Postgresql JDBC driver with the DriverManager
    Class.forName("org.postgresql.Driver");

    // Open a connection to the database using DriverManager
    conn = DriverManager.getConnection(
        "jdbc:postgresql://localhost:5432/assignment1",
        "postgres","Km81920265");


        // Create the statement
        Statement statement = conn.createStatement();

        // Use the created statement to SELECT
        // the student attributes FROM the Student table.
        rs = statement.executeQuery("SELECT * FROM countries_and_states WHERE is_country='t'");


%>

<%//first delcare input %>
Please enter your first name, last name and middle initial:<p>
<form method="get" action="address.jsp">
<%//store input into session %>
Your first name :<input type="text" size="15" name="firstName" onchange="allLetter(this.value); "/><p/>
Your last name  :  <input type="text" size="15" name="lastName"/><p/>
Your middle name:<input type="text" size="15" name="middleName"/><p/>

<%//display dropdown menu using for looop %>
Provide country information menu:<p>
Country:
<select name="Countryid">

<%




while(rs.next()){
%>
<option value="<%=rs.getInt("cs_id")%>"><%=rs.getString("country_state")%>
</option>
<%} %>
</select>

<p>
<%-- -------- Close Connection Code -------- --%>
            <%
                // Close the ResultSet
                if(rs != null){
                    rs.close();
                }

                // Close the Statement
                statement.close();

                // Close the Connection
                conn.close();


 %>

<%///closing up the entry page and submit the data %>
<input type="submit" value="Submit Personal Data" onclick="this.disabled=true;"/>

</form>
</body>
</html>
4

2 回答 2

0

试试这个，我改成inputtxt.value.value

function allLetter(value)  
{  
 var letters = /^[A-Za-z]+$/;  
 if(value.match(letters))  //removed inputtxt and added `letters`
   {  
    return true;  
   }  
 else  
   {  
   alert("message");  
   return false;  
   }  
}  ​

演示：http: //jsfiddle.net/H44j6/

更新

更改此行

Your first name :<input type="text" size="15" name="firstName" onchange="allLetter(this.value); "/><p/>

至

Your first name :<input type="text" size="15" name="firstName" onkeydown="allLetter(this.value); "/><p/>

或者

Your first name :<input type="text" size="15" name="firstName" onblur="allLetter(this.value); "/><p/>
于 2012-12-06T03:30:32.987 回答
0

您正在将输入元素传递给 allLetter。你应该这样写方法。

function allLetter(inputtxt)  
{  
 var letters = /^[A-Za-z]+$/;  
 if(inputtxt.value.match(alphaExp))  
   {  
    return true;  
   }  
 else  
   {  
   alert("message");  
   return false;  
   }  
}
于 2012-12-06T03:25:08.827 回答