如何将数组列表从servlet传递到javascript?
问题描述:
我正在通过从servlet传递数组列表,方法是在属性中进行设置并将其转发到jsp
I'm passing an arraylist from servlet by setting it in the attribute and forwarding it to the jsp
Servlet:
ArrayList <String> mylist = new ArrayList <String>();
mylist.add("Superman");
mylist.add("batman");
mylist.add("flash");
request.setAttribute("mylist", mylist);
request.getRequestDispatcher("Welcome.jsp").forward(request, response);
response.sendRedirect("Index.jsp");
Index.jsp
Index.jsp
function doPopulateList(obj)
{
alert("HELLO"+obj.id +obj.name+obj.value);
var select = document.getElementsByClassName("my_dropdown1");
alert("all good");
//var list = new Array();
var list = '${mylist}';
//var options = ["1", "2", "3", "4", "5"];
alert("All good till arraylist");
for(var i=0;i<list.length;i++)
{
alert(list[i]);
}
当我尝试将arraylist值放在警报框中时,我会收到类似
When I'm trying put the arraylist values in the alert box, I'm getting alerts like
[
S
U
我希望警报像
Superman
batman
flash
如果这是重复的问题,请原谅我.
Pardon me if this is duplicate question.
答
首先,您需要遍历服务器端列表并将每个元素添加到JS数组中,然后servlet才不将响应发送给客户端.
Firstly, you need to traverse the server-side list and add each element to JS array before the servlet does not send the response to the client.
因此,这可能有效:
<script>
var list = [
<c:forEach items="${mylist}" var="hero">
'<c:out value="${hero}" />',
</c:forEach>
];
console.log(list);
</script>