Django - save selected checkboxes and generate next round

I'm getting troubles how to make a next move in my app. In my views.py there are two functions which draw and return a non-repetitive pair of players.

views.py :

def check(who, tournament_pairs):
    for fighter in tournament_pairs:
        if who == fighter[0] or who == fighter[1]:
            return False
return True

#If odd number of players
def who_not_fight(tournament_pairs, fighters):
    final_fighters = list(itertools.chain(*tournament_pairs))

return list(set(fighters) - set(final_fighters))

where I use it:

    ...

    fighters = PlayerTournament.objects.all().order_by('?')

    all_pairs = itertools.combinations(fighters, 2)
    tournament_pairs = []

    for pair in all_pairs:
        if check(pair[0], tournament_pairs):
            tournament_pairs.append(pair)

    alone_fighter = who_not_fight(tournament_pairs, fighters)

    if alone_fighter:
        tournament_pairs.append((alone_fighter[0], None))

And getting selected values in checkboxes:

def get_checked(request):
    checked = []
    if request.method == 'POST':
        for key, _ in request.POST.items():
            if key != 'csrfmiddlewaretoken':
                checked.append(key)
    print checked

    return StreamingHttpResponse(','.join(checked))

Everything works nice. When I select the winners:

template.html

            {% if fights %}
            <form id='checked' method="POST" action="/get_checked/">
                <div class="container-fluid">
                    {% for fighter1, fighter2 in fights %}
                        <div class="row">
                            <div class="col-md-2">
                                <div class="panel panel-info">
                                    <div class="panel-body">
                                        {% if fighter1 or fighter2 %}
                                            <ul>
                                                <li><input name="{{ fighter1.player_id.id }}" type="checkbox" class="checked">
                                                    {{ fighter1.player_id.name }}
                                                    {{ fighter1.player_id.surname }}
                                                </li>
                                            </ul>
                                            <center>vs.</center>
                                            <ul>
                                                <li>
                                                    {% if fighter2 %}
                                                        <input name="{{ fighter2.player_id.id }}" type="checkbox" class="checked">
                                                        {{ fighter2.player_id.name }}
                                                        {{ fighter2.player_id.surname }}
                                                    {% else %}
                                                        BYE
                                                    {% endif %}
                                                </li>
                                            </ul>
                                        {% endif %}
                                    </div>
                                </div>
                            </div>
                        </div>
                    {% endfor %}
                </div>
                {% csrf_token %}
                <input id="checked" type='submit' value="Save" class="btn">
            </form><br>

            <form id="form2" method="POST" action="/next_round/">
            {% csrf_token %}
                <input type="submit" value="Next round" class="btn">
            </form>

        {% endif %}

After clicking button I'm being redirect to /get_checked/ and I got my selected id's of checkboxes. All I wanna do is to save these values without redirecting page.

Then I tried to use Ajax:

javascript.js

$(document).ready(function () {
$("#checked").click(function () {
    var input_string = $("#forminput").val();
    $.ajax({
        url: "/ajaxexample_json",
        type: "POST",
        dataType: "json",
        data: {
            client_response: input_string,
            csrfmiddlewaretoken: '{{ csrf_token }}'
        },
        success: function (json) {
            $('#result').append('Server Response: ' + json.server_response);
        },
        error: function (xhr, errmsg, err) {
            alert(xhr.status + ": " + xhr.responseText);
        }
    });
    return false;
});
});

Unfortunately, nothing happened. The next move I'd like to do is to generate the next pair of players (having selected id's of players). Also without refreshing page, just after I click the button "Next round".

Does anyone did it before or may have some ideas how would I do it in easier way ? Or maybe I got wrong somewhere in my code ?

This is how it looks: Before clicking save button After clicking save button

Thanks for each response!