在JQUERY中更改时获取附加文本框的值

需要帮忙。

如何获得具有相同类名的附加文本框的值？请找到代码片段。

JS：

var count = document.getElementsByName("emailId[]").length; //get the totol no. of contact no. elements
//function to add a new element for entering emailId 
$("#add-email-id").click(function () {
    $("#email-id-container").append('<div id="emailAddress_container_' + count + '" style="margin-top:8px"><input type="text" name="emailId[]"  id="email_address_' + count + '" data-toggle="tooltip" title="Enter Email address here" placeholder="[email protected]" size="30" onBlur="ValidateEmail(' + count + ');" class="emailId"><span><input class="username" id="username_' + count + '" name="username[]" value="username" /></span><span style="margin-left:8px;"><a href="javascript:void(0);"  class="delete-email-id" style="color:#F00;">(-)</a></span><span id="email_err_' + count + '"></span></div>');
    count++; //increment the counter as new contact element is being added.
});

$(document).ready(function () {
    $('.emailId').change(function () {
        var usernameDiv = $(this).parent("div").find(".username").attr("id"); //get the div where the truncated username will be placed
        alert($(this).attr("id"));
        alert($("#" + usernameDiv).val());
        var emailAddress = $(this).val();
        var truncatedValue = emailAddress;
        var name = "";
        if (emailAddress.indexOf("@") != -1) {
            ///alert("@");      
            name = $.trim(emailAddress.split("@")[0]);
            //alert(name);
            if (name && name.search(/\s/) === -1) {
                var len = name.length;
                //alert(len);
                if (len > 4) {
                    truncatedValue = name.substring(0, 3);
                }
                usernameDiv.val(truncatedValue);
            } else {
                usernameDiv.val("username");
            }
        }
    });
});

我需要获取email_address字段的值，然后在附加的相应用户名字段中获取截断的值。