获取复选框的选中值并将其发送到 servlet

发布于 2024-10-08 05:31:41 字数 2552 浏览 3 评论 0原文

我必须显示前面带有复选框的用户列表。我现在想选择一些名称并将其从数据库中删除。我已经编写了代码来显示用户。我不知道如何获取所选值并将其删除。请帮助我，这是我尝试过的

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<%String user=request.getParameter("Users"); %>
<script type="text/javascript">
var chk="dummy";
 function doSubmit(theClick){
        window.open("AddUser.jsp");
        return false;
        }
function setValue(chVal)
{
    chk=chk+","+chVal;
    alert(chk);

}       
function doDelete(theClick){
    document.buttons.action = "AddUserServlet?type=delete&name="+chk;
    alert(chk);
    document.buttons.submit();          

}
</script>
</head>
<body>
<center>

<!--  action="AddUserServlet"--> 

<%
try{
String User[]=user.trim().split(" ");
for(int i=0;i<User.length;i++){
    out.println("<html>");
    out.println("<body>");
    out.println("<form>");
    out.println("<input type='checkbox' value='User[i]' onClick='setValue(this.value)' name='user'>"+User[i]+"</input>");
    //out.println("<input type='checkbox' value='User'+i+ name='user1'>"+User[i]+"</br>"+"</form>");
    out.println("</form>");
    out.println("</body>");
    out.println("</html>");
    //out.println("<input type='checkbox' value='User'+i+ name='user1'>"+User[i]+"</br>"+"</form>");
}
}catch(Exception e){
    e.printStackTrace();
}

%>

<!--
<form method="Post" name="buttons"> 
 <input type='checkbox' value='User' onClick="setValue(this.value)" name='user1'></input>
<input type='checkbox' value='User1' onClick="setValue(this.value)" name='user1'></input>
<input type='checkbox' value='User2' onClick="setValue(this.value)" name='user1'></input>
<div id="add"></div>
</form>-->

<form method="Post" name="add">
<input type="submit" value="ADD" onclick="return doSubmit(this)">
<input type="submit" value="MODIFY" onClick="return doSubmit(this)">
<input type="submit" value="DELETE" onClick="return doDelete(this)">
</form>
</center>
</body>
</html>

。上面的代码显示名称列表以及复选框。但返回值“user”而不是数据库中的名称。另外，如果我取消选中一个名称，它会再次返回用户。

[*]abc-----> returns dummy,user
if i uncheck this []user returns dummy,user0,user1

我需要获取用户名列表。

原文

I have to display a list of users with checkbox in its front. I now want to select some of the names and delete it in database. I have written code to display users. I don't know how to get the selected values and delete it. Please help me here is what I have tried

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<%String user=request.getParameter("Users"); %>
<script type="text/javascript">
var chk="dummy";
 function doSubmit(theClick){
        window.open("AddUser.jsp");
        return false;
        }
function setValue(chVal)
{
    chk=chk+","+chVal;
    alert(chk);

}       
function doDelete(theClick){
    document.buttons.action = "AddUserServlet?type=delete&name="+chk;
    alert(chk);
    document.buttons.submit();          

}
</script>
</head>
<body>
<center>

<!--  action="AddUserServlet"--> 

<%
try{
String User[]=user.trim().split(" ");
for(int i=0;i<User.length;i++){
    out.println("<html>");
    out.println("<body>");
    out.println("<form>");
    out.println("<input type='checkbox' value='User[i]' onClick='setValue(this.value)' name='user'>"+User[i]+"</input>");
    //out.println("<input type='checkbox' value='User'+i+ name='user1'>"+User[i]+"</br>"+"</form>");
    out.println("</form>");
    out.println("</body>");
    out.println("</html>");
    //out.println("<input type='checkbox' value='User'+i+ name='user1'>"+User[i]+"</br>"+"</form>");
}
}catch(Exception e){
    e.printStackTrace();
}

%>

<!--
<form method="Post" name="buttons"> 
 <input type='checkbox' value='User' onClick="setValue(this.value)" name='user1'></input>
<input type='checkbox' value='User1' onClick="setValue(this.value)" name='user1'></input>
<input type='checkbox' value='User2' onClick="setValue(this.value)" name='user1'></input>
<div id="add"></div>
</form>-->

<form method="Post" name="add">
<input type="submit" value="ADD" onclick="return doSubmit(this)">
<input type="submit" value="MODIFY" onClick="return doSubmit(this)">
<input type="submit" value="DELETE" onClick="return doDelete(this)">
</form>
</center>
</body>
</html>

The code above displays list of names along with checkboxes. But returns value "user" and not the name in database. Also if I uncheck a name it again returns user.

[*]abc-----> returns dummy,user
if i uncheck this []user returns dummy,user0,user1

I need get the username list.

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看春风乍起 2024-10-15 05:31:41

您将在每个复选框周围打印一个全新的和

。您的 HTML 最终在浏览器中显示如下：

<html>
    <head></head>
    <body>
        <html><body><form><input type="checkbox"></form></body></html>
        <html><body><form><input type="checkbox"></form></body></html>
        <html><body><form><input type="checkbox"></form></body></html>
        <form><input type="submit"></form>
    </body>
</html>

This is 语法无效 HTML。您需要重写代码，以便所有复选框和提交按钮都以相同形式结束：

<html>
    <head></head>
    <body>
        <form>
            <input type="checkbox">
            <input type="checkbox">
            <input type="checkbox">
            <input type="submit">
        </form>
    </body>
</html>

然后您也不需要那些丑陋的 JavaScript 解决方法。您只需为复选框指定相同的名称，但指定不同的值即可。这样您就可以通过 HttpServletRequest#getParameterValues() 获取检查的值。

String[] users = request.getParameterValues("user");

You're printing a whole new <html> and <form> around every single checkbox. Your HTML ends up in browser like as:

<html>
    <head></head>
    <body>
        <html><body><form><input type="checkbox"></form></body></html>
        <html><body><form><input type="checkbox"></form></body></html>
        <html><body><form><input type="checkbox"></form></body></html>
        <form><input type="submit"></form>
    </body>
</html>

This is syntactically invalid HTML. You need to rewrite your code so that all checkboxes and the submit button ends up in the same form:

<html>
    <head></head>
    <body>
        <form>
            <input type="checkbox">
            <input type="checkbox">
            <input type="checkbox">
            <input type="submit">
        </form>
    </body>
</html>

Then you also don't need those ugly JavaScript workarounds. You just give the checkboxes the same name, but a different value. This way you can just grab the checked values by HttpServletRequest#getParameterValues().

String[] users = request.getParameterValues("user");

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云仙小弟 2024-10-15 05:31:41

您需要为每个用户的每个复选框分配不同的名称。这样，获取 POST 表单的 servlet 可以检查每个复选框名称（例如 user1...userX），如果设置了其值，则可以删除相应的用户。请注意，如果未设置该复选框，则不会为该名称发送任何表单编码参数，因此您实际上可以仅检查发送了哪些名称并删除它们。

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