jQuery自动完成在Flask中 [英] jQuery autocomplete in Flask
问题描述
在 manage.py 中，我得到了以下内容：
@app。 route（'/ autocomplete'，methods = ['GET']）
def autocomplete（）：
results = []
search = request.args.get（'autocomplete'）
for mv in db_session.query（Movie.title）.filter（Movie.title.like（'％'+ str（search）+'％'））。all（）：
results.append（mv [b]
return jsonify（json_list = results）
我的索引。 html 文件：
< head>
...
< link href =http://code.jquery.com/ui/1.10.2/themes/smoothness/jquery-ui.css =Stylesheet> < /链路>
< script src =../ static / js / jquery.js>< / script>
< script src =http://code.jquery.com/ui/1.10.2/jquery-ui.js>< / script>
< script type =text / javascript>
$（$ b $ .ajax（{
url：'{{url_for（autocomplete）}}'
}）。done（function（data）自动完成（{
source：data.json_list，
minLength：2
}）;
}）; $ b $（'＃autocomplete' b}）;
< / script>
...
< / head>
< body>
...
< div>
< input name =autocompletetype =textid =autocompleteclass =form-control input-lg/>
< / div>
...
< / body>
看起来像firefox中的开发工具不会返回任何错误。
终端返回以下内容：
$ b
GET / autocomplete HTTP / 1.1200 -
GET / HTTP / 1.1200 -
GET
/static/css/bootstrap.css HTTP / 1.1304 -
GET /static/js/jquery.js
HTTP / 1.1304 -
小工具不起作用。由于我不太了解jQuery，所以无法弄清楚导致问题的原因。有人能帮我吗？
下面是工作的JS / jQuery和Flask代码：
@ app.route（'/ autocomplete'，methods = ['GET']）
def autocomplete（）：
search = request。 args.get（'q'）
query = db_session.query（Movie.title）.filter（Movie.title.like（'％'+ str（search）+'％'））
results = [mv [0] for mv in query.all（）]
return jsonify（matching_results = results）
HTML / jQuery：
< head>
< link href =// code.jquery.com/ui/1.10.2/themes/smoothness/jquery-ui.css =Stylesheet>< / link>
< script src =// code.jquery.com/jquery-2.2.0.min.js\">< ;; script>
< script src =// code.jquery.com/ui/1.10.2/jquery-ui.js>< / script>
< script type =text / javascript>
$（function（）{
$（＃autocomplete）。autocomplete（{
source：function（request，response）{
$ .getJSON（{{url_for （'autocomplete'）}}，{
q：request.term，//在flask中，q将是使用request.args
}，function（data）{
response（data.matching_results）; //来自jsonify的匹配结果
}）;
}，
minLength：2，
select：function（event，ui）{
console.log（ui.item.value）; //不在你的问题中，但可能在以后帮助
}
}）;
}）
< / script>
< / head>
< body>
< div>
< input name =autocompletetype =textid =autocompleteclass =form-control input-lg/>
< / div>
< / body>
有点解释是为了：'q'是您在jQuery中定义的搜索字词参数名称$ .getJSON ajax调用。这是传递给烧瓶，并采用 request.args.get 。数据库查询是从那里构建的，列表理解用来构造结果。请注意，列表解析不会初始化列表，也不会使用for + append组合;接下来，jsonify返回列表 results 作为一个字典包装成<$ code> matching_results 保存结果列表。不要试图使用 json.dumps 将列表返回给您的ajax调用。请参阅这里为什么（TL / DR：安全问题）。
还要注意的是，我故意改变了一些变量名，所以你可以告诉脚本/烧瓶函数看到哪个变量。例如，ajax调用没有看到列表 results ，它看到 matching_results 。这里面（现在的JavaScript的）数据对象。
获取列表 matching_results 是使用附加脚本中的模式的关键。它比简单发送列表更混乱，但更安全，并最终将允许您在客户端使用JS / jQuery进行更复杂的事情。
最后， select 选项将用户的选择打印到开发者控制台，仅供参考，因此您可以实际响应用户的选择。
<对于更完整的jquery-autocomplete示例，请参阅使用AJAX加载数据一节 here 。
Can't make jQuery autocomplete widget work with Flask framework. (http://jqueryui.com/autocomplete/#remote here is an example)
In manage.py I got the following :
@app.route('/autocomplete', methods=['GET'])
def autocomplete():
results = []
search = request.args.get('autocomplete')
for mv in db_session.query(Movie.title).filter(Movie.title.like('%' + str(search) + '%')).all():
results.append(mv[0])
return jsonify(json_list=results)
My index.html file:
<head>
...
<link href="http://code.jquery.com/ui/1.10.2/themes/smoothness/jquery-ui.css" rel="Stylesheet"></link>
<script src="../static/js/jquery.js"></script>
<script src="http://code.jquery.com/ui/1.10.2/jquery-ui.js" ></script>
<script type="text/javascript">
$(function() {
$.ajax({
url: '{{ url_for("autocomplete") }}'
}).done(function (data) {
$('#autocomplete').autocomplete({
source: data.json_list,
minLength: 2
});
});
});
</script>
...
</head>
<body>
...
<div>
<input name="autocomplete" type="text" id="autocomplete" class="form-control input-lg"/>
</div>
...
</body>
Looks like dev tools in firefox don't return any errors. The terminal returns the following:
"GET /autocomplete HTTP/1.1" 200 -
"GET / HTTP/1.1" 200 -
"GET /static/css/bootstrap.css HTTP/1.1" 304 -
"GET /static/js/jquery.js HTTP/1.1" 304 -
The widget just doesn't work. Since I don't know much about jQuery I can't figure out what causes the problem. Can anybody help me please ?
Below is working JS/jQuery and Flask code:
@app.route('/autocomplete', methods=['GET'])
def autocomplete():
search = request.args.get('q')
query = db_session.query(Movie.title).filter(Movie.title.like('%' + str(search) + '%'))
results = [mv[0] for mv in query.all()]
return jsonify(matching_results=results)
HTML/jQuery:
<head>
<link href="//code.jquery.com/ui/1.10.2/themes/smoothness/jquery-ui.css" rel="Stylesheet"></link>
<script src="//code.jquery.com/jquery-2.2.0.min.js"></script>
<script src="//code.jquery.com/ui/1.10.2/jquery-ui.js" ></script>
<script type="text/javascript">
$(function() {
$("#autocomplete").autocomplete({
source:function(request, response) {
$.getJSON("{{url_for('autocomplete')}}",{
q: request.term, // in flask, "q" will be the argument to look for using request.args
}, function(data) {
response(data.matching_results); // matching_results from jsonify
});
},
minLength: 2,
select: function(event, ui) {
console.log(ui.item.value); // not in your question, but might help later
}
});
})
</script>
</head>
<body>
<div>
<input name="autocomplete" type="text" id="autocomplete" class="form-control input-lg"/>
</div>
</body>
A bit of explanation is in order: 'q' is your search term argument name as defined in jQuery's $.getJSON ajax call. That's passed to flask, and picked up using request.args.get. The database query is constructed from that, and a list comprehension is used to construct the results. Note that with list comprehensions you don't initialize the list, nor do you use a for+append combination; one elegant line does everything.
Next, jsonify returns the list results wrapped as a dictionary with the key matching_results holding the results list. Do not be tempted to use json.dumps to return a list to your ajax call. See here why (TL/DR: security concerns).
Note also that i've deliberately changed some variable names so you could tell what script/flask function 'sees' which variable. E.g., the ajax call doesn't see the list results, it sees matching_results. And that's inside (now javascript's) data object.
To grab the list matching_results is the key for, use the pattern in the attached script. It's messier than simply sending a list, but more secure, and eventually will allow you to do more sophisticated things on the client-side using JS/jquery.
Finally, the select option prints the user's selection to the developer console, just for reference so you can actually respond to a user's selection.
For a more complete jquery-autocomplete example see the 'Load Data with AJAX' section here.
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