Submit form within bootstrap modal using ajax and codeigniter without page change

I am trying to submit a form within a bootstrap modal using ajax. And my form is successfully submitted, but the success statements within ajax are not executed. The page is redirected to a blank page saying {"msg":"ok"}. I am pasting the code from controller and view. Please help.

Controller

$update_profile_details = $this->userp_m->edit_profile_m($uname,$uemail,$data1,$new_email);

            if($update_profile_details == true)
            {
                $status['msg'] = 'ok';
            }
            else
            {
                $status['msg'] = 'err';
            }

            echo json_encode ($status);

View

    $(document).ready(function()
{   

$("#myForm").submit(function(e) 
{   
    e.preventDefault();
    var reg = /^[A-Z0-9._%+-]+@([A-Z0-9-]+\.)+[A-Z]{2,4}$/i;
    var name = $('#inputName').val();
    var email = $('#inputEmail').val();

    if (name.trim() == '') {
        alert('Please enter your name.');
        $('#inputName').focus();
        return false;
    } else if (email.trim() == '') {
        alert('Please enter your email.');
        $('#inputEmail').focus();
        return false;
    } else if (email.trim() != '' && !reg.test(email)) {
        alert('Please enter valid email.');
        $('#inputEmail').focus();
        return false;
    } else {
        var fd = new FormData(this);

        $.ajax({
            type: 'POST',
            url: $('#myForm').attr('action'),
            dataType: "json",
            data: $('#myform').serialize(), fd,
            contentType: false,  
            cache: false,   
            processData:false,
            beforeSend: function() 
            {
                $('.submitBtn').attr("disabled", "disabled");
                $('.modal-body').css('opacity', '.5');
            },
            success: function(status) 
            {
                alert(status);

                if (status.msg == 'ok') {
                    $('#inputName').val('');
                    $('#inputEmail').val('');
                    $('.statusMsg').html('<span style="color:green;">Changes have been saved successfully.</p>');
                } else 
                {
                    $('.statusMsg').html('<span style="color:red;">Some problem occurred, please try again.</span>');
                }

                $('.submitBtn').removeAttr("disabled");
                $('.modal-body').css('opacity', '');
            },
            error: function(status) 
            {
                alert("Some error, please try again");

            }
        });
    }

});

HTML

 <form id="myform" method="post" enctype="multipart/form-data" action="<?php echo site_url('User/user_index_c/edit_profile_c'); ?>">
    <label>Full Name : </label>
    <input class="name_styling" type="text" placeholder="Enter name" id="inputName" name="uname">

    <label>Email Id : </label>
    <input class="email_styling" type="email"  placeholder="Enter email" id="inputEmail" name="new_email">

    <div class="controls">
    <label>Profile Photo : </label>
    <input name="file1" type="file"  id="image_file" />
    <img id="blah" class="logoupload" src="#" alt="your image" />
    <span class="filename"></span>
    </div>

    <center><input class="submitBtn" id="submit" type="submit" value="Save Changes" name="submit" ></center>

</form>