Render Jinja after jQuery AJAX request to Flask

问题:

I have a web application that gets dynamic data from Flask when a select element from HTML is changed. of course that is done via jquery ajax. No probs here I got that.

The problem is, the dynamic data - that is sent by Flask -, is a list of objects from the database Flask-sqlalchemy.

Of course the data is sent as JSON from Flask.

I'd like to iterate through those objects to display their info using Jinja.

HTML

<select id="#mySelect">
    <option value="option1" id="1">Option 1 </option>
    <option value="option2" id="1">Option 2 </option> 
    <option value="option3" id="3">Option 3 </option>
</select>

jQuery

$('body').on('change','#mySelect',function(){
   var option_id = $('#mySelect').find(':selected').attr('id');
   $.ajax({
     url: "{{ url_for('_get_content') }}",
     type: "POST",
     dataType: "json",
     data: {'option_id':option_id},
     success: function(data){
       data = data.data;
      /* HERE I WANT TO ITERATE THROUGH THE data LIST OF OBJECTS */
     }

   });
});

Flask

@app.route('/_get_content/')
def _get_content():
    option_id = request.form['option_id']
    all_options = models.Content.query.filter_by(id=option_id)
    return jsonify({'data': all_options})

PS : I know that jinja gets rendered first so there is no way to assign jQuery variables to Jinja. So how exactly am I going to iterate through the data list if I can't use it in Jinja ?

回答1:

Okay, I got it.

Simply, I made an external html file and added the required jinja template to it.

{% for object in object_list %}
   {{object.name}}
{% endfor %}

then in my Flask file I literally returned the render_template response to the jquery ( which contained the HTML I wanted to append )

objects_from_db = getAllObjects()
return jsonify({'data': render_template('the_temp.html', object_list=objects_from_db)}

And then simply append the HTML from the response to the required div to be updated.

回答2:

If you are sending data using json you don't need to use Jinja2. You can simply try something like this:

@app.route('/_get_content/')
def _get_content():
    option_id = request.form['option_id']
    all_options = models.Content.query.filter_by(id=option_id)
    return jsonify({'data': [option.name for option in all_options]})

or define a method in your model something like to_json that returns a field or dictionary or ... and call it in your view.

@app.route('/_get_content/')
def _get_content():
    option_id = request.form['option_id']
    all_options = models.Content.query.filter_by(id=option_id)
    return jsonify({'data': [option.to_json() for option in all_options]})