Created
May 5, 2017 01:55
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dynamic update of selectField options Flask Ajax
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| from flask import Flask | |
| from flask import json, make_response, render_template_string, request | |
| from flask_wtf import Form | |
| from wtforms import IntegerField, SelectField | |
| from wtforms.validators import DataRequired | |
| template = """ | |
| <html> | |
| <head> | |
| <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> | |
| </head> | |
| <body> | |
| <form action="" method="post" id="selectDevice" name="device"> | |
| {{ form.hidden_tag() }} | |
| <p> | |
| Nummber of Devices: {{ form.selectAmount(size=1) }} | |
| Select device: {{form.deviceAddress() }} | |
| </p> | |
| </form> | |
| <script type="text/javascript" charset="utf-8"> | |
| $("#deviceAddress").click(function(){ | |
| $.ajax({ | |
| url: '/selectform', | |
| type: 'POST', | |
| data: $('#selectDevice').serialize(), | |
| success: function(selectOptions){ | |
| $("#deviceAddress").empty(); | |
| for (var i = 0; i < selectOptions.length; i++){ | |
| $("#deviceAddress").append( | |
| $("<option></option>") | |
| .attr("value", selectOptions[i][0]) | |
| .text(selectOptions[i][1]) | |
| ); | |
| } | |
| } | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> | |
| """ | |
| app = Flask(__name__) | |
| app.config['WTF_CSRF_ENABLED'] = True | |
| app.config['SECRET_KEY'] = 'you-will-never-guess' | |
| class SelectDevice(Form): | |
| deviceAddress = SelectField('device number') | |
| selectAmount = IntegerField('amount devices', | |
| [DataRequired()], | |
| default = 3) | |
| def __init__(self, *args, **kwargs): | |
| super(SelectDevice, self).__init__(*args, **kwargs) | |
| defaultAmount = self.selectAmount.data | |
| self.deviceAddress.choices = [('device{}'.format(i), i) for i in range(defaultAmount)] | |
| @app.route('/') | |
| @app.route('/selectform', methods=['GET']) | |
| def select(): | |
| form = SelectDevice() | |
| return render_template_string(template, form=form) | |
| @app.route('/selectform', methods=['POST']) | |
| def updateselect(): | |
| deviceAmount = int(request.form.get('selectAmount')) | |
| choices = [('device{}'.format(i), i) for i in range(deviceAmount)] | |
| response = make_response(json.dumps(choices)) | |
| response.content_type = 'application/jsons' | |
| return response | |
| if __name__ == '__main__': | |
| app.run() |
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| <html> | |
| <head> | |
| <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> | |
| </head> | |
| <body> | |
| <form action="" method="post" id="selectDevice" name="device"> | |
| {{ form.hidden_tag() }} | |
| <p> | |
| Nummber of Devices: {{ form.selectAmount(size=1) }} | |
| Select device: {{form.deviceAddress() }} | |
| </p> | |
| </form> | |
| <script type="text/javascript" charset="utf-8"> | |
| $("#deviceAddress").click(function(){ | |
| $.ajax({ | |
| url: '/selectform', | |
| type: 'POST', | |
| data: $('#selectDevice').serialize(), | |
| success: function(selectOptions){ | |
| $("#deviceAddress").empty(); | |
| for (var i = 0; i < selectOptions.length; i++){ | |
| $("#deviceAddress").append( | |
| $("<option></option>") | |
| .attr("value", selectOptions[i][0]) | |
| .text(selectOptions[i][1]) | |
| ); | |
| } | |
| } | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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