How to get data from server by using JSON, JQuery and AJAX?
Question
I am newer on developing flask-python based applications and got stuck in some point. The problem is that I cannot retrieve data from mysql.
First of all, let me share my some files' contents, at least some parts of them. For html, I am using bootstrap.
index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<link href="http://getbootstrap.com/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="http://getbootstrap.com/examples/jumbotron-narrow/jumbotron-narrow.css" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="../static/css/search-bar.css">
<script type=text/javascript src="{{ url_for('static', filename='js/jquery-1.11.2.js') }}"></script>
<script type=text/javascript src="{{ url_for('static', filename='js/wordQuery.js') }}"></script>
</head>
<body>
<div class="jumbotron">
<h1>Search</h1>
<div class="container">
<div class="row">
<div id="custom-search-input">
<div class="input-group col-md-12">
<input type="text" id="wordInput" class="form-control input-lg" placeholder="Please type the word you want to search" />
<span class="input-group-btn">
<button class="btn btn-info btn-lg" type="button" id="btnWordSearch">
<i class="glyphicon glyphicon-search"></i>
</button>
</span>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
app.py:
from flask import Flask, render_template, json, jsonify, request
from flaskext.mysql import MySQL
from werkzeug import generate_password_hash, check_password_hash
mysql = MySQL()
app = Flask(__name__)
# MySQL configurations
app.config['MYSQL_DATABASE_USER'] = 'USER_NAME'
app.config['MYSQL_DATABASE_PASSWORD'] = 'PASSWORD'
app.config['MYSQL_DATABASE_DB'] = 'DATABASE_NAME'
app.config['MYSQL_DATABASE_HOST'] = 'localhost'
mysql.init_app(app)
@app.route('/')
def main():
return render_template('index.html')
@app.route('/wordQuery', methods=['POST', 'GET'])
def checkWord():
word = request.form['wordInput']
success = "OK"
error = "NOK"
word = word.lower()
try:
with connection.cursor() as cursor:
# Read a single record
sql = "SELECT `word` FROM `allwords` \
WHERE `word` like %s"
cursor.execute(sql, (word + "%",))
result = cursor.fetchone()
if result is not None:
return json.dumps({'message': 'The word exists in the database !'})
else:
return json.dumps({'error': str(data[0])})
except Exception as e:
return json.dumps({'error': str(e)})
finally:
cursor.close()
conn.close()
if __name__ == "__main__":
app.run(debug=True, port=5005)
wordQuery.js:
$(function(){
$('#btnWordSearch').click(function(){
$.ajax({
url: '/wordQuery',
data: $('form').serialize(),
type: 'POST',
success: function(response){
console.log(response);
},
error: function(error){
console.log(error);
}
});
});
});
I want to see that when a word is searched, it should be found on the database and browser console should write the message 'The word exists in the database !'. Later, I want to implement another html page which gives results.
Thank you in advance for your help!
UPDATE:
I was getting the below error when I first posted this problem here;
jquery-1.11.2.js:9659 POST 127.0.0.1:5005/wordQuery 400 (BAD REQUEST)
However, now I changed a part in my html file. There was an id element like this: id="wordInput" and I changed it like this: name="wordInput" . After this change, I am getting a new error like this following;
jquery-1.11.2.js:9659 POST http://127.0.0.1:5005/wordQuery 500 (INTERNAL SERVER ERROR)
1 answers
solution1
0 2016-11-14 15:56:52
I don't see a form element in your HTML. You're probably POST ing empty data
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