Java 如何将一组复选框值从一个 JSP 页面传递到另一个
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How to pass an array of checkbox value From one JSP page to another
提问by Salini L
I am a beginner. I want to pass an array of check box values from one JSP page to another. The page getting data is
我是初学者。我想将一组复选框值从一个 JSP 页面传递到另一个页面。获取数据的页面是
<%
ResultSet rs=s.notapprovedqns();
%>
<%
while(rs.next())
{ %>
<tr><td><input name="qns[]" type="checkbox" value="<% out.println(rs.getInt("question_id")); %>" /></td><td><center><%=rs.getString("question_id") %></center></td><td><%=rs.getString("question") %></td></td></tr>
<%
}
%>
How can i receive check box values in JSP another page. I have tried the following code but its not working properly
如何在 JSP 另一个页面中接收复选框值。我尝试了以下代码，但无法正常工作
String[] h=null;
h=request.getParameterValues("qns[]");
But its passing the value
但它传递了价值
[Ljava.lang.String;@a0a595
Please somebody help me to solve this problem.
请有人帮我解决这个问题。
采纳答案by Mazhar
You Can use it as follows. in Form
您可以按如下方式使用它。通知
<form method="post" action="process.jsp">
<input type="checkbox" name="list" value="value1">
<input type="checkbox" name="list" value="value2">
<input type="checkbox" name="list" value="value3">
</form>
In process.jsp
进程中.jsp
String[] ids=request.getParameterValues("list");
// this will get array of values of all checked checkboxes
for(String id:ids){
// do something with id, this is checkbox value
}
回答by Juned Ahsan
You are getting an array so you need to get the elements using index, such as:
您正在获取一个数组，因此您需要使用索引获取元素，例如：
h=request.getParameterValues("qns[]");
String item = h[0]
or use a loop to iterate entire array.
或使用循环来迭代整个数组。
回答by JNL
for(int count=0; count<h.length; count++){
// DO SOME OPERATION on h[count];
}
Also, just a recommendation, please do not name the variables as qns[], you can always keep it simple by saying selectedItems
另外，只是一个建议，请不要将变量命名为qns[]，您始终可以通过说来保持简单selectedItems
回答by AhmadDani
You may use stringbuilder(), i hope it's works:
您可以使用 stringbuilder()，我希望它有效：
ResultSet rs=s.notapprovedqns();
StringBuilder lstquestion = new StringBuilder();
while(rs.next()) {
String question_id = rs.getString("question_id");
String question = rs.getString("question");
lstquestion.append('<tr><td><input name="qns[]" type="checkbox" value='+question_id+' /></td><td><center>'+question_id+'</center></td><td>'+question+'</td></td></tr>')
}
