Suppose, I have a simple HTML checkbox.
When the HTML page is loaded through flask initially, this checkbox displays boolean values from a postgres database. It cannot be included in an HTML form, nor I can use submit button.
Now, if I tick/untick this checkbox, I want to send the value associated with this checkbox to flask and ultimately to db.
Can I do it with ninja or do I need ajax call for it?? I tried with ajax, but :(
I am a newbie to ajax,json,flask.
I tried searching other questions, but most of them I found were with HTML form or with php.
Sorry for my lack of knowledge, if I miss something.
<input type="checkbox" id="statustick" name="statustick" value="{{ testvariable }}" {% if testvariable==True %}checked{% endif %}>
<script>
$("#statustick").change( function(){
if( $(this).is(':checked') ) {
$.ajax({
type: "POST",
url: "{{ url_for('logging') }}",
contentType: "application/json",
data: JSON.stringify("#check".val()),
dataType: "json",
success: function(response) {
console.log(response);
},
error: function(err) {
console.log(err);
}
});
}else{
alert("unchecked");
}
});
Related
I am trying to send data from a form to Python Flask using ajax. I do not want the page to reload. When I try to send the form I get the error
POST http://127.0.0.1:5000/addTran 400 (BAD REQUEST)
I just want to input a Russian word with an English translation and then to write it to a file from flask.
Here is my html and JavaScript
<form id="translationForm">
<label for="russianWord">Russian Word:</label><br>
<input type="text" id="russianWord" serialize-as="russianWord" name="russianWord"><br>
<label for="englishWord">English word:</label><br>
<input type="text" id="englishWord" serialize-as="englishWord" name="englishWord">
<input type="submit" value="Submit">
</form>
<script>
$(function () {
$('#translationForm').on('submit',function (e) {
$.ajax({
type: 'POST',
url: "{{url_for('addTran')}}",
data: $('#translationForm').serialize(),
contentType: "application/j-son;charset=UTF-8",
dataType: "json",
success: function () {
alert("It worked!");
}
});
e.preventDefault();
});
});
Here is my Python route
#app.route('/addTran',methods=["POST"])
def addTran():
if request.method == "POST":
tran = request.get_json(force=True)
with open('/home/matt/Desktop/info.txt','w') as w:
w.write(str(tran))
Adding JSON.stringify() worked!
data: JSON.stringify($('#translationForm').serialize())
Maybe it's the typo in the request content type?
contentType: "application/j-son;charset=UTF-8",
To
contentType: "application/json",
I'm try to send data to a django view through ajax with POST method as I saw in one tutorial.
The code I've made is the following (myURL is the URL where I call testview):
$(document).on('submit','#form',function(e){
e.preventDefault();
$.ajax({
type:'POST',
url:'/myURL/',
data:{
HELLO: "I'm inside ajax data"
},
contentType: "application/json",
datatype: 'json',
sucess:function(){
alert("Ajax pass data correctly");
}
})
});
</script>
And in django I'd call HELLO as following. test.html is where I have the html form
if request.method == 'POST':
takeHELLOfromajaxpost = request.POST['HELLO']
return render(request,'test.html',{'dataTakenfromAjax':takeHELLOfromajaxpost})
return render(request,'test.html',{})
Then I would template tagging in the same HTML {{ dataTakenfromAjax }} to verify if I'm taking that data , but nothing happens! I even get no error.
First of all, you are not sending csrfmiddlewaretoken with your request.
Second, you have typo in success argument.
Third, you probably expecting it to completely change html? Than you should add $("body").html() at successful response. That way your variable appear on page.
test.html:
{{ dataTakenfromAjax }}
<form action="" id="form">
{% csrf_token %}
<button type="submit">Submit</button>
</form>
<script
src="https://code.jquery.com/jquery-3.4.1.js"
integrity="sha256-WpOohJOqMqqyKL9FccASB9O0KwACQJpFTUBLTYOVvVU="
crossorigin="anonymous"></script>
<script>
$(document).on('submit', '#form', function (e) {
e.preventDefault();
$.ajax({
type: 'POST',
url: '/myURL/',
data: {
csrfmiddlewaretoken: $("[name=csrfmiddlewaretoken]").val(),
HELLO: "I'm inside ajax data"
},
success: function (data) {
$("body").html(data);
}
})
});
</script>
I have given {% csrf_token %} inside the form.
Do I have to give another {% csrf_token %} inside the AJAX $.ajax({ .......... )} ?
<form method="post" data-validate-username-url="{% url 'validate_username' %}">
{% csrf_token %}
{{ form.as_p }}
<button type="submit">Sign up</button>
</form>
<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
<script>
$("#id_username").change(function () {
console.log($(this).val());
var form = $(this).closest("form");
$.ajax({
url: form.attr("data-validate-username-url"),
data: form.serialize(),
dataType: 'json',
success: function (data) {
if (data.is_taken) {
alert(data.error_message);
}
}
});
});
</script>
See below for how I changed your code. The csrf_token is assigned to a variable with Django templating. You can produce this variable in any of your Javascript code.
The token is then included in the header
<script>
var token = '{{csrf_token}}';
$("#id_username").change(function () {
console.log($(this).val());
var form = $(this).closest("form");
$.ajax({
headers: { "X-CSRFToken": token },
url: form.attr("data-validate-username-url"),
data: form.serialize(),
dataType: 'json',
success: function (data) {
if (data.is_taken) {
alert(data.error_message);
}
}
});
});
</script>
The documentation very well explained how to use AJAX
https://docs.djangoproject.com/en/2.1/ref/csrf/
Get this library https://github.com/js-cookie/js-cookie/
Add this var csrftoken = Cookies.get('csrftoken');
The last step is configure ajax setup
function csrfSafeMethod(method) {
// these HTTP methods do not require CSRF protection
return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
}
$.ajaxSetup({
beforeSend: function(xhr, settings) {
if (!csrfSafeMethod(settings.type) && !this.crossDomain) {
xhr.setRequestHeader("X-CSRFToken", csrftoken);
}
}
});
Update to the steps above - as the Django documentation indicates you can use the Javascript Cookie library to do a Cookies.get('csrftoken'). Also, I had to add {% csrf_token %} before the function call. Might be obvious, but I didn't know so providing it here to help others
This question is not new, however I've spent really plenty of time, but coudn't fixed it.
<form id="test_data_form" action={% url 'insert_test_data' %} method="post">{% csrf_token %}
<input type="submit" value="Insert test data">
<div id="message"></div>
</form>
<script type="text/javascript">
var form = $("test_data_form");
$(document).ready(function() {
form.submit(function() {
$.ajax({
data: form.serialize(),
url: form.attr('action'),
cache: false,
type: form.attr('method'),
dataType:'json',
success: function(response) {
alert("1");
},
error: function() {
alert('Error!');
}
}
);
return false;
}
);
}
);
</script>
views.py
#csrf_exempt
def insert_test_data(request):
print request.is_ajax()
data = {'success': True, 'html': "text"}
return HttpResponse(json.dumps(data), mimetype="application/json")
urls.py
url(r'^hello/insert_test_data/$', insert_test_data, name="insert_test_data"),
Firstly, I've found that success isn't caught, so then while debugging I found that django doesn't think it is an ajax request and redirects me to the different page: /insert_test_data. And I want to stay on the home page.
I've found a lot of advices about that problem (e.g. cache: false) but none of them helped. I agree, that I miss something obvious, but couldn't figure out what exactly.
I'll be realy glad for any help.
The JavaScript to handle the form submit looks ok at first inspection, but there's one mistake:
var form = $("test_data_form");
If you use Firebug or Chrome developer tools and query for this element in the console, you won't get anything back because you're missing a selector (tag, id, class, etc). From your form tag, I think you meant to select by id:
var form = $("#test_data_form");
I have a form which is loaded via jQuery from the external template file:
$('#imguploadform').html(' ').load('{% url upload_form %}');
In template it looks like this:
<img src="{{ MEDIA_URL }}img/misc/upload.png" alt="Illustration" title="myimage" />
<form id="uploadForm" enctype="multipart/form-data" method="post" action="upload_picture/">
{{ form.as_ul }}
<input type="submit" value="Upload" id="uploadImage" />
</form>
I'm trying to upload an image with ajax using jquery form plugin:
var submit_options = {
target: '#picworks',
dataType: 'json',
success: function() {
alert('It Works!');
}
};
$('#uploadForm').submit(function(){
$(this).ajaxSubmit(submit_options);
return false;
});
But then I want to return a json object from server and dynamically load into page an image using it's returned address. I've tried like this:
def upload_picture(request):
dest = save_original(request.FILES['image'])
form = UploadImageForm(request.POST, request.FILES)
res = json.dumps({
"path": dest,
})
return HttpResponse(res, mimetype='application/json')
The problem is that I can't catch a json response in javascript, so my browser shows me just an empty page with json dictionary content. What I'm doing wrong?
Have your success callback take a parameter. That will be the response.
var submit_options = {
target: '#picworks',
dataType: 'json',
success: function(response) {
alert('It Works!');
window.location.href = response.path;
}
};
I solved the problem! The thing is that function which replace form submitting action with an ajax request is called earlier than the form loads from external file. So it should be like this:
$('#imguploadform').html(' ').load('{% url upload_form %}',
function(){
var submit_options = {
dataType: 'json',
success: update_dom
};
function update_dom(data) {
$('#picworks').html('<img src="' + data.path + '" alt="Illustration" />');
}
$('#uploadForm').submit(function(){
$(this).ajaxSubmit(submit_options);
return false;
});
});