我正在创建一个小应用程序,让用户可以向上或向下投票。我正在使用Django(以及它的新功能!)。
我只是想知道,向用户展示upvote链接的最佳方式是什么。作为链接,按钮还是别的什么?
我已经在php中使用不同的框架做了类似的事情,但我不确定我是否可以这样做。我应该有一个上/下投票的方法,然后显示一个链接到用户点击。当他们点击它时,它会执行该方法并刷新页面吗?
答案 0 :(得分:32)
这是我的解决方案的要点。我使用jQuery / AJAX的图像来处理点击。受此网站的影响很大。有一些东西可以使用一些工作(例如客户端中的错误处理 - 其中大部分可能会被重构)但希望代码对您有用。
HTML:
<div class="vote-buttons">
{% ifequal thisUserUpVote 0 %}
<img class="vote-up" src = "images/vote-up-off.png" title="Vote this thread UP. (click again to undo)" />
{% else %}
<img class="vote-up selected" src = "images/vote-up-on.png" title="Vote this thread UP. (click again to undo)" />
{% endifequal %}
{% ifequal thisUserDownVote 0 %}
<img class="vote-down" src = "images/vote-down-off.png" title="Vote this thread DOWN if it is innapropriate or incorrect. (click again to undo)" />
{% else %}
<img class="vote-down selected" src = "images/vote-down-on.png" title="Vote this thread DOWN if it is innapropriate or incorrect. (click again to undo)" />
{% endifequal %}
</div> <!-- .votebuttons -->
jQuery:
$(document).ready(function() {
$('div.vote-buttons img.vote-up').click(function() {
var id = {{ thread.id }};
var vote_type = 'up';
if ($(this).hasClass('selected')) {
var vote_action = 'recall-vote'
$.post('/ajax/thread/vote', {id:id, type:vote_type, action:vote_action}, function(response) {
if (isInt(response)) {
$('img.vote-up').removeAttr('src')
.attr('src', 'images/vote-up-off.png')
.removeClass('selected');
$('div.vote-tally span.num').html(response);
}
});
} else {
var vote_action = 'vote'
$.post('/ajax/thread/vote', {id:id, type:vote_type, action:vote_action}, function(response) {
if (isInt(response)) {
$('img.vote-up').removeAttr('src')
.attr('src', 'images/vote-up-on.png')
.addClass('selected');
$('div.vote-tally span.num').html(response);
}
});
}
});
处理AJAX请求的Django视图:
def vote(request):
thread_id = int(request.POST.get('id'))
vote_type = request.POST.get('type')
vote_action = request.POST.get('action')
thread = get_object_or_404(Thread, pk=thread_id)
thisUserUpVote = thread.userUpVotes.filter(id = request.user.id).count()
thisUserDownVote = thread.userDownVotes.filter(id = request.user.id).count()
if (vote_action == 'vote'):
if (thisUserUpVote == 0) and (thisUserDownVote == 0):
if (vote_type == 'up'):
thread.userUpVotes.add(request.user)
elif (vote_type == 'down'):
thread.userDownVotes.add(request.user)
else:
return HttpResponse('error-unknown vote type')
else:
return HttpResponse('error - already voted', thisUserUpVote, thisUserDownVote)
elif (vote_action == 'recall-vote'):
if (vote_type == 'up') and (thisUserUpVote == 1):
thread.userUpVotes.remove(request.user)
elif (vote_type == 'down') and (thisUserDownVote ==1):
thread.userDownVotes.remove(request.user)
else:
return HttpResponse('error - unknown vote type or no vote to recall')
else:
return HttpResponse('error - bad action')
num_votes = thread.userUpVotes.count() - thread.userDownVotes.count()
return HttpResponse(num_votes)
Thread模型的相关部分:
class Thread(models.Model):
# ...
userUpVotes = models.ManyToManyField(User, blank=True, related_name='threadUpVotes')
userDownVotes = models.ManyToManyField(User, blank=True, related_name='threadDownVotes')
答案 1 :(得分:12)
即插即用:
RedditStyleVoting
使用django-voting执行任何模型的reddit样式投票 http://code.google.com/p/django-voting/wiki/RedditStyleVoting
答案 2 :(得分:10)
无论你做什么,确保它是由POST提交而不是GET; GET请求永远不会更改数据库信息。
答案 3 :(得分:7)