jQuery autocomplete in Flask

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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

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太阳男子

2020-12-09 00:51
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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