Sending list box items to a servlet using Jquery AJAX [duplicate]

Question

I have a list box in an HTML form. I want to send the list items to a servlet using jquery and AJAX. At the server side, I want to add the sent list items one by one in a database. I tried this using an array in my jsp where I filled it with list items,and then sent it using AJAX, but at servlet I am getting NULL.

my jsp code:

var arr=new Array();
    var rel=$("#rcombo :selected").text();
    $("#listbox  option").each(function(){
        arr[0]=$("#listbox").text();
    });     

    $.ajax({
        type:"get",
        url:"NewServlet",
        data:{list:arr,rel:rel},
      success:function(){}
});

servlet code:

String list[]=request.getParameterValues("list");
System.out.println(list);

Then I changed the code a little bit:

jsp:

var arr=new Array();
    var rel=$("#rcombo :selected").text();
    $("#listbox  option").each(function(){
        arr[0]=$("#listbox").text();
    });     

    $.ajax({
        type:"get",
        url:"NewServlet",
        data:{list:arr[0],rel:rel},
      success:function(){}
});

servlet:

String list[]=request.getParameterValues("list");
System.out.println(list[0]);

Now, I am getting the data. But, all items are in list[0]. I am not able to extract them one by one. Please help me.

Sridhar R · Accepted Answer · 2014-04-12 06:21:12Z

0

Try this

$("#listbox  option").each(function(){
        arr.push($(this).text()); // this line push all text in array
});

Change

 data:{list:arr,rel:rel},

AJAX

$.ajax({
            url:"NewServlet",
            type:"POST",
            dataType:'json',
            data: {list:arr,rel:rel},
            success:function(data){
                // codes....
            }
     });

Servlet

String[] list = request.getParameterValues("list[]");

edited Apr 12, 2014 at 6:21

answered Apr 12, 2014 at 5:26

Sridhar R

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11 Comments

edge Over a year ago

:This time it gives Java.lang.null pointer exception.

edge Over a year ago

At jsp,I implemented the changes you have told.Now if I check the values of arr using alert, the values are seperated by comma. But then at servlet it is giving null pointer exception.

Sridhar R Over a year ago

where you put alert.when this ajax happening?when you cal this functons.Kindly tell clear ly

edge Over a year ago

After pushing the values to arr, I used alert(arr).It showed all the values like apple,jam,mango. It is ok here. But now at servlet side, exception is getting thrown when I use list[0].

Sridhar R Over a year ago

@edge check with updated code

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