将数据从 javascript 传递到 servlet
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passing data from javascript to servlet
提问by Sumithra
I have values of checkbox and as soon as I click delete the values and the type must be sent to a servlet called DeleteServlet. Please help me how to send the values?
我有复选框的值，一旦我单击删除值，必须将类型发送到名为 DeleteServlet 的 servlet。请帮我如何发送值？
<html>
<head>
<script type="text/javascript">
function get_check_value(chkbox){
if(chkbox.checked){
var Values=chkbox.value;
//send this Values to servlet
}
}
function doDelete(theClick){
var type=theClick;
//send this type to servlet
alert(type);
}
</script>
</head>
<%String user=request.getParameter("Users"); %>
<body>
<%
String User[]=user.trim().split(" ");
for(int i=0;i<User.length;i++){%>
<center>
<form name='list' action='AddUserServlet'>
<% out.println("<input type='checkbox' name='user" + i + "' value='"+ User[i] + "' onClick='return get_check_value(this)'>" + User[i]+ "</input>" ); %>
</form>
<%}%>
<input type="submit" value="ADD" name="b1" >
<input type="submit" value="MODIFY" name="b1">
<input type="submit" value="DELETE" name="b1" onClick="return doDelete(value)" >
</center>
</body>
</html>
I tried this "document.list.user.value" in an alert box it comes as undefined object. To send to a servlet I tried the following line but nothing is read
我在警告框中尝试了这个“document.list.user.value”，它作为未定义的对象出现。要发送到 servlet，我尝试了以下行，但没有读取任何内容
chk_val=chkbox.value;
document.add.action = "AddUserServlet?type=delete&name="+chk_val;
document.add.submit();
回答by BalusC
You don't need Javascript for this at all.
您根本不需要 Javascript。
Just change your code so that the HTML form is generated as follows:
只需更改您的代码，以便按如下方式生成 HTML 表单：
<form action="AddUserServlet" method="post">
<input type="checkbox" name="user" value="1">
<input type="checkbox" name="user" value="2">
<input type="checkbox" name="user" value="3">
<input type="checkbox" name="user" value="4">
<input type="checkbox" name="user" value="5">
<input type="submit" name="b1" value="ADD">
<input type="submit" name="b1" value="MODIFY">
<input type="submit" name="b1" value="DELETE">
</form>
(the checkbox value must be the unique user ID)
（复选框值必须是唯一的用户 ID）
Then use request.getParameterValues()in your AddUserServlet:
然后request.getParameterValues()在您的AddUserServlet：
String b1 = request.getParameter("b1");
if ("DELETE".equals(b1)) {
String[] users = request.getParameterValues("user");
// ...
}
The usersarray will contain the checked values (1, 2, 3, 4 and/or 5).
该users数组将包含检查的值（1、2、3、4 和/或 5）。
回答by user257980
Could you use jQuery javascript libary. It is easy to use and you will find lots of tutorials. Here is good tutorial about get method(AJAX) http://api.jquery.com/jQuery.get/
你能用jQuery javascript libary吗？它易于使用，您会发现很多教程。这是关于获取方法（AJAX）http://api.jquery.com/jQuery.get/的很好的教程
Is it possible to do it without javascript?
没有javascript可以做到吗？
