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July 2, 2012 08:15
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Making a basic AJAX request with Flask
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| # Answer to a question on Flask mailing list | |
| # http://librelist.com/browser//flask/2012/6/30/using-ajax-with-flask/ | |
| # NOTE: *REALLY* don't do the thing with putting the HTML in a global | |
| # variable like I have, I just wanted to keep everything in one | |
| # file for the sake of completeness of answer. | |
| # It's generally a very bad way to do things :) | |
| # | |
| from flask import (Flask, request, jsonify) | |
| app = Flask(__name__) | |
| html_page = """<!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <title>Rough AJAX Test</title> | |
| <script> | |
| function loadXMLDoc() | |
| { | |
| var req = new XMLHttpRequest() | |
| req.onreadystatechange = function() | |
| { | |
| if (req.readyState == 4) | |
| { | |
| if (req.status != 200) | |
| { | |
| //error handling code here | |
| } | |
| else | |
| { | |
| var response = JSON.parse(req.responseText) | |
| document.getElementById('myDiv').innerHTML = response.username | |
| } | |
| } | |
| } | |
| req.open('POST', '/ajax') | |
| req.setRequestHeader("Content-type", "application/x-www-form-urlencoded") | |
| var un = document.getElementById('scname').value | |
| var sec = document.getElementById('secret').value | |
| var postVars = 'username='+un+'&secret='+sec | |
| req.send(postVars) | |
| return false | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <h1>Flask AJAX Test</h1> | |
| <form action="" method="POST"> | |
| <input type="text" name="scname" id="scname"> | |
| <input type="hidden" name="secret" id="secret" value="shhh"> | |
| <input type="button" value="Submit" onclick="return loadXMLDoc()"> | |
| </form> | |
| <div id="myDiv"></div> | |
| </body> | |
| </html>""" | |
| @app.route('/') | |
| def index(): | |
| return html_page | |
| @app.route('/ajax', methods = ['POST']) | |
| def ajax_request(): | |
| username = request.form['username'] | |
| return jsonify(username=username) | |
| if __name__ == "__main__": | |
| app.run(debug = True) |
What's the intention behind returning the JSON string in the ajax_request method?
return jsonify(username=username)Not sure what this is doing! Thanks, this is a great tut
It's just there to show how you would return some data from the ajax request. If I remember correctly, it needs to be given a header and stuff as part of the request and the jsonify() method handles all of that and makes it accessible in the javascript response object, rather than as plain text that you then have to parse.
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What's the intention behind returning the JSON string in the ajax_request method?
return jsonify(username=username)Not sure what this is doing! Thanks, this is a great tut