I am exploring RESTful Flask API and as a learning I have created a small web form in HTML. Please see below the code for HTML.
<!DOCTYPE html>
<html>
<h2>User Input</h2>
<body
<script>
src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src="/static/js/predict.js"></script>
<p>Please enter the Power prices per unit</p>
<form method="get" action='/predict' target ="_blank"
enctype="multipart/form-data">
New Value - 1:<br>
<input type="number" id="New_val_1">
<br>
New Value - 2:<br>
<input type="number" id="New_val_2">
<br><br>
<button id="btnpredict" type="button">Predict</button>
</form>
<p>If you click the "Submit" button, the form-data will be sent to a page
called "/action_page.php".</p>
</body>
</html>'
Please see below the code for predict.js. This is a JQuery AJAX
$(function(){
$('#btnpredict').click(function(){
$.ajax({
url: '/predict',
data: JSON.stringify({userInput: uInput})
type: 'GET',
contentType: 'application/json',
success: function(response){
("#results").text(response.results);
},
error: function(error){
console.log(error);
}
});
});
});
And finally, the app.py code where the above HTML is getting rendered and upon receiving the the values passed on forms ML model is used.
from flask import Flask, redirect, request, render_template,json, Response
import statsmodels.api as sm
import numpy as np
from sklearn.externals import joblib
app = Flask(__name__)
#app.route('/')
#app.route('/home')
def home():
return render_template('index.html')
#app.route('/predict', methods = ['GET'])
def predict():
if request.method=='GET':
X_value_new_1 = request.values.get('New_val_1')
X_value_new_2 = request.values.get('New_val_2')
X_1,X_2 = X_value_new_1,X_value_new_2
testData = np.array([X_1,X_2]).astype(np.float).reshape(-1,1)
testData=sm.add_constant(testData)
pred = Regression_model.predict(testData)
dump = json.dumps({'prediction':list(pred)})
resp = Response(dump,mimetype='application/json')
return resp
return None
def load_model():
global Regression_model
Regression_model = joblib.load('E:/model_file_save')
if __name__ == "__main__":
print("**Starting Server...")
load_model()
app.run(debug=True)
Now the problem:
When I click on Predict button nothing happens. However, if on the address-bar if I write the 'http://localhost:5000/predict?New_val_1=1000&New_val_2=2000' then I get the correct prediction values in JSON format.
How to fix this issue? Is there any problem in JQuery?
Please help.
Best
AR
Read textbox values e.g. $("#tag").val() and concate with ajax url e.g.
predict?New_val_1=1000&New_val_2=2000'
and remove data property. You can also pass values using data property see below link for example.
https://www.codeproject.com/Questions/870797/How-to-pass-textbox-value-to-other-page-using-Jque
Related
I am building a Flask site that dynamically loads some information like the time but I'm running into some issue with AJAX with jQuery.
Following the example on the flask site https://flask.palletsprojects.com/en/1.1.x/patterns/jquery/
I want to change it to a dynamic URL based on the users unique ID instead of a static one.
Python File:
from flask import Flask, jsonify, render_template, request
app = Flask(__name__)
#app.route('/_add_numbers/<UNIQUEID>')
def add_numbers():
a = request.args.get('a', 0, type=int)
b = request.args.get('b', 0, type=int)
return jsonify(result=a + b)
#app.route('/')
def index():
return render_template('index.html')
The HTML
<script type=text/javascript>
$(function() {
$('a#calculate').bind('click', function() {
$.getJSON($SCRIPT_ROOT + '/_add_numbers/UNIQUEID', {
a: $('input[name="a"]').val(),
b: $('input[name="b"]').val()
}, function(data) {
$("#result").text(data.result);
});
return false;
});
});
</script>
<h1>jQuery Example</h1>
<p><input type=text size=5 name=a> +
<input type=text size=5 name=b> =
<span id=result>?</span>
<p><a href=# id=calculate>calculate server side</a>
I cannot figure out how to put a unique ID into the HTML. Any help is much appreciated!
There are a variety of ways to do this. I would recommend simply adding the user's id into the template context, with render_template("index.html", user_id=current_user.id) (make sure you import current_user from flask. This will return a user id if the user is logged in, and None if not. Then you can do the following:
$(function() {
$("a#calculate").bind("click", function() {
$.getJSON($SCRIPT_ROOT + "/_add_numbers/{{ user_id }}",
etc etc: your code goes here
)}
)}
That should do it.
Alternatively you could actually use the value of current_user.id (if you feel you understand it) in the template, as this is implicitly passed down with Jinja anyway. o substitute {{ user_id }} with `{{ current_user.id }}.
I'm trying to develop a web-app with Flask and HTML and right now I need to get the user input, pass it to the Python back-end, execute a function and return its output, placing it inside an HTML element. I also want this to happen without refreshing the HTML page.
How can I do this?
Bellow I have the code that I've developed so far but it's not working correctly:
My HTML:
<div id="ThroughputRate" class="data_entry">
<form action="{{ url_for('background_check_throughputrate') }}" method="post">
<input name="throughput_rate_text" class="input_box">
<input id="checkThroughputRate" type="submit" class='new-button-data' value="Check Throughput Rate">
<output name="throughputRateResult" class="result_box" ></output>
</form>
</div>
My Flask backend:
#app.route('/background_check_throughputrate', methods=['GET', 'POST'])
def background_check_throughputrate():
if request.method == 'POST':
text = request.form['throughput_rate_text']
processed_text = str(text)
throughput = transition_throughput_rate(processed_text)
return jsonify(throughput)
My HTML (continuation to get the output of the function executed on Flask):
<script type=text/javascript>
$(function() {
$('a#checkThroughputRate').bind('click', function() {
$.getJSON('/background_check_throughputrate', function(data) {
console.log(data);
document.getElementById('throughputRateResult').innerHTML = data;
});
return false;
});
});
</script>
The idea behind my execution is that the user uses the first snippet of code (in HTML) to insert the input, this input is passed onto the second snippet of code (in flask) and finally, the output of the function is passed onto the last snippet of code (in JS inside HTML) so that it can be displayed on the corresponding HTML element.
So far, the input is being correctly processed inside flask but the issue is that when the function returns the jsonify, it appears on the screen, instead of sending it into the frontend. What am I doing wrong?
Thank you all
$.getJSON is designed to load the JSON data from endpoint using GET request, however, your Python code example responds to only POST requests.
Here is the working code:
HTML
<div id="ThroughputRate" class="data_entry">
<form action="{{ url_for('background_check_throughputrate') }}" method="post" id="throughputRateForm" enctype="multipart/form-data">
<input name="throughput_rate_text" class="input_box">
<input id="checkThroughputRate" type="submit" class='new-button-data' value="Check Throughput Rate">
<output id="throughputRateResult" class="result_box" ></output>
</form>
</div>
Python
#app.route('/background_check_throughputrate', methods=['GET', 'POST'])
def background_check_throughputrate():
if request.method == 'POST':
text = request.form['throughput_rate_text']
processed_text = str(text)
throughput = transition_throughput_rate(processed_text)
return jsonify(throughput)
JavaScript
<script type="text/javascript">
$(function () {
$('#throughputRateForm').on('submit', function (e) {
e.preventDefault();
var form = $(this)[0];
var formData = new FormData(form);
$.ajax({
url: '/background_check_throughputrate',
method: 'POST',
data: formData,
processData: false,
contentType: false,
success: function (data) {
console.log(data);
document.getElementById('throughputRateResult').innerHTML = data;
}
});
});
});
</script>
Also, this code blindly trusts the user input and displays it on the webpage which can result to Cross-Site Scripting (XSS) and that is not good!
Avoid using innerHTML property when displaying user input, because it can be used to inject malicious HTML tags (e.g. <script>), i would highly recommend using innerText property instead.
I am making a "write anything here" webpage where users can write anything in a textbox then post it and it is visible to everyone. It worked fine till I found out that when any user writes and submits, all the others have to refresh the page so as to get the new data from database. So a solution to this was to call ajax continuously in some intervals. This would check if there are new entries in the table. If yes, then it would render it to the html without refreshing the whole page. Now I am pure ajax noob and after hours of research I am unable to find out how to do it.
Here is the html code
<div id="textArea">
<form action="http://127.0.0.1:3000" method="POST">
<br>
<textarea minlength="3" name="comment" placeholder="Enter Text Here.." required></textarea>
<input id="postButton" type="submit" name="" value="POST">
</form>
</div>
</div>
<div class="show">
{% for item in data %}
<div id="auto" class="disPost">{{item[0]}}</div>
{% endfor %}
</div>
Here the textarea is in a form and it submits the text to database via flask server.
Also, all the comments that users wrote are shown in "div.show"
Now the flask code is like this
#app.route('/', methods = ['POST', 'GET'])
def home():
if request.method == 'POST':
post = request.form["comment"]
myquery = "select p_id from posts order by p_id desc limit 1"
mycursor.execute(myquery)
new_p_id = mycursor.fetchone()[0] + 1
myquery = "select exists(select * from posts where p_des=%s)"
rec_tup = (post,)
mycursor.execute(myquery, rec_tup)
if mycursor.fetchone()[0]==0:
myquery = "insert into posts values(%s, %s)"
rec_tup = (new_p_id, post)
mycursor.execute(myquery, rec_tup)
mydb.commit()
mycursor.execute("select distinct p_des from posts order by p_id desc")
data = mycursor.fetchall()
return render_template("homepage.html", data=data)
"mydb" is the connector & "mycursor" is the connector's cursor
Now I am stuck somewhere in how to call AJAX function. I am not able to write beyond this ..
$(document).ready(function() {
setInterval(function() {
$.ajax({
url: '',
type: 'GET',
data: //something must be here,
success: function(data) {
//here "div" must be added to the "show" class - that is comment of other users
}
})
}, 3000);
});
I know that I have to do something like this but am literally not able to solve it.
I know this is not good question and I must look at tutorials first. But believe me I had it all. I am not able to solve this problem at all.
Thank you for seeing this :)
I did this on my latest project, you can try it too. But make sure to refresh only div element you want the data show, not all the page.
$(document).ready(function() {
function getData(){
$.ajax({
url: '',
type: 'GET',
data: //something must be here,
success: function(data) {
//here "div" must be added to the "show" class - that is comment of other users
}
});
}
getData();
setInterval(function() {getData()},2000);
});
Hey guys I have a problem,
I have next function in my views.py:
#userRegistered
def getSyncGit(request, section):
print 'POTATOE' #(<-debug print)
cmd = '. script.sh 1'
p = sp.Popen(['/bin/bash', '-c', cmd], stdout=sp.PIPE, stderr=sp.PIPE)
result = p.wait()
return HttpResponseRedirect(getURL(request.LANGUAGE_CODE, '/assistant/configuration/project/list/'))
At the urls.py:
from .views import getSyncGit
url(r'^/project/sync/$', getSyncGit, {'section':'configuracion'}, name='pgetSyncGit'),
And in my template:
<script type="text/javascript">
function sendSyncProject()
{
$.ajax({url: "{% url 'pgetSyncGit' %}", success: function(result){
alert('cool');
}});
}
</script>
<td>
<input id="butSendSyncProject" type="button" name="butSendSyncProject" style="margin-left:1px;" value="{% trans 'Sinc' %}" onclick="sendSyncProject()" />
</td>
<td>
asdasdasdasdasddas
</td>
When I call to action with button, I can see thealert message, but the getSyncGit function is not executed.
When I call to action with url href, it redirects me to the url "/project/sync/", but the function neither executes....
Try to change your script to a script that writes a line into a file like "echo 'test' > tmp.txt" and tell us if tmp.txt is being created or not
Thank you for your answer #Oliver
I've tried what you've said and it doesn't work.
I've tried the following:
At the urls.py:
from .views import editDeProject
url(r'^/project/edit/0', editDeProject, {'section':'configuracion'}, name='pgetSyncGit'),
And now i have next function in my views.py:
def editDeProject(request, id, section):
"""Page Edit of DB de_project"""
errorTable = ''
form = None
if id == 0:
getSyncGit(request,id,section)
else:
try:
table = DeProject.objects.get(codProject=id)
if request.method == 'POST':
Using this method it works, it prints POTATOE and it generates file.txt, however I'm forcing url.py to take id 0 as an input.
therefore I believe the problem is when the (r'^/project/sync/(?P.*)/' gets generated
I have a simple html page which renders with a number of nearly identical forms for the user to submit. Upon submit, the view is intended to add a row to the database, recreate the list of forms with slightly updated data, and send it back to the browser ('/route/complete/' maps to add_completed_route_view in urls.py).
This works perfectly the first time. Once the page has been redrawn with the new list of forms, however, the next submit will fail the request.is_ajax() test I have in the view. That causes it to skip to request.REQUEST['next'] and subsequently to home_view.
I've commented it out below, but I've also tried appending c['HTTP_X_REQUESTED_WITH'] = 'XMLHttpRequest' to the view but it hasn't helped.
I'm looking for help in ensuring that the headers continue to have the appropriate XMLHttpRequest param while the user submits through AJAX. Code is below, and help is much appreciated.
script.js
<script>
$(document).ready(function() {
$(".doneForm").submit(function() {
var route_id = $(this).find('input[name=route_id]').val()
var next = $(this).find('input[name=next]').val()
var reqData = {route_id:route_id,next:next}
$.ajax({
type: "post",
url: "/route/complete/",
data: reqData,
success: function(data) {
$("#routeTable").html(data);
}
});
return false;
});
});
</script>
and
template.html
<div id="routeTable">
{% for route in route_list %}
<div id="routeDone">
<form class="doneForm" action="/route/complete/" method="post">
<input type="hidden" name="route_id" value="{{ route.route_id }}" />
<input type="hidden" name="next" value="{{ request.get_full_path }}" />
<input type="submit" value="Done" class="doneButton" />
</form>
</div>
{% endfor %}
</div>
and
views.py
def add_completed_route_view(request):
if request.method == 'POST' and request.user.is_authenticated():
add_completed_route(request)
if request.is_ajax():
wall_slug = get_wall_slug_from_route_id(request.REQUEST['route_id'])
c = get_context_for_wall_page(request, wall_slug)
# c['HTTP_X_REQUESTED_WITH'] = 'XMLHttpRequest'
return render_to_response('m/js_route_table.html', c, context_instance=RequestContext(request))
else:
return HttpResponseRedirect(request.REQUEST['next'])
else:
return HttpResponseRedirect(reverse('home_view'))
The problem is that once the Ajax is completed, it replaces the original form with a new one - and this one no longer has the javascript event handler attached, so the next time the form submits via the normal POST method.
Luckily, jQuery has a couple of methods that handle this for you - live and delegate. So instead of $(".doneForm").submit(function() ..., do this:
$(".doneForm").live("submit", function() {...