dojo.xhrpost getting status code as 0 - ajax

I am submitting a for using dojo's xhrpost. My app runs on ruby on rails. In the controller I am performing a redirect. I store the redirected URL the response headers. I access the redirected URL on the client and then load the redirected URL on the client. The following is the code.
In the view, performing ajax submit using dojo.xhrpost
function () {
var form = dojo.byId("form_id");
dojo.connect(form, "onsubmit", function(event){
// Stop the submit event since we want to control form submission.
dojo.stopEvent(event);
var xhrArgs = {
form: dojo.byId("form_id"),
handleAs: "text",
load: function(data, ioargs){
//getting redirected url from response header
var new_url = ioargs.xhr.getResponseHeader("new_url");
//redirecting to the url
document.location.href = new_url;
},
error: function(response){
//handling error
}
}
//submitting for to action1 of controller
var deferred = dojo.xhrPost(xhrArgs);
});
}
Code in controller
def action1
new_url = url_for(:controller=>"controller", :action => "action2")
#passing the new URL as parameter in the redirection
redirect_to :action2, :new_url => new_url
end
def action2
#getting the new url from the params and saving it in respone header so that it can be accesses in client
response.headers["new_url"] = params[:new_url]
end
This worked fine on my local host. But when I put it on my server its failing.
I am getting the ioargs.xhr.status as "0". data is " ". Though the form is getting saved response is empty and no response headers are getting set.
Please Help.

I had to modify the controller a bit.
def action1
if request.xhr?
render :json => new_url.to_json
else
#follow normal redirection
redirect_to :action2
end
Also in the ajax call
var xhrArgs = {
form: dojo.byId("form_id"),
handleAs: "json",
load: function(data, ioargs){
//getting redirected url from data
document.location.href = data;
},
error: function(response){
//handling error
}
Basically I found out returning the entire HTML page as response in not the right way.
Only the URL should be returned in the response and redirection should be done from the View,

Related

Django - Making an Ajax request

Im having a hard time figuring out how to integrate this ajax request into my view. I'm still learning how to integrate django with ajax requests.
My first question would be: Does the ajax request need to have its own dedicated URL?
In my case I am trying to call it on a button to preform a filter(Preforms a query dependent on what is selected in the template). I have implemented this using just django but it needs to make new request everytime the user preforms a filter which I know is not efficient.
I wrote the most basic function using JQuery to make sure the communication is there. Whenever the user changed the option in the select box it would print the value to the console. As you will see below in the view, I would to call the ajax request inside this view function, if this is possible or the correct way of doing it.
JQuery - Updated
$("#temp").change( function(event) {
var filtered = $(this).val();
console.log($(this).val());
$.ajax({
url : "http://127.0.0.1:8000/req/ajax/",
type : "GET",
data : {
'filtered': filtered
},
dataType: 'json',
success: function(data){
console.log(data)
},
error: function(xhr, errmsg, err){
console.log("error")
console.log(error_data)
}
});
Views.py
def pending_action(request):
requisition_status = ['All', 'Created', 'For Assistance', 'Assistance Complete', 'Assistance Rejected']
FA_status = RequisitionStatus.objects.get(status='For Assistance')
current_status = 'All'
status_list = []
all_status = RequisitionStatus.objects.all()
status_list = [status.status for status in all_status]
# This is where I am handling the filtering currently
if request.GET.get('Filter') in status_list:
user_req_lines_incomplete = RequisitionLine.objects.filter(Q(parent_req__username=request.user) & Q(status__status=request.GET.get('Filter')))
current_status = request.GET.get('Filter')
else:
user_req_lines_incomplete = RequisitionLine.objects.filter(parent_req__username=request.user).exclude(status__status='Completed')
user_reqs = Requisition.objects.filter(par_req_line__in=user_req_lines_incomplete).annotate(aggregated_price=Sum('par_req_line__total_price'),
header_status=Max('par_req_line__status__rating'))
return render(request, 'req/pending_action.html', { 'user_reqs':user_reqs,
'user_req_lines_incomplete':user_req_lines_incomplete,
'requisition_status':requisition_status,
'current_status':current_status,
'FA_status':FA_status})
def filter_status(request):
status = request.GET.get('Filter')
data = {
'filtered': RequisitionLine.objects.filter(Q(parent_req__username=request.user) & Q(status__status=status)),
'current_status': status
}
return JsonResponse(data)
Urls.py
path('pending/', views.pending_action, name='pending_action')
First: you have to divide your template to unchangeable part and the part that you want to modify with your filter.
Second: for your goal you can use render_to_string. See the followning link https://docs.djangoproject.com/en/2.1/topics/templates/#usage
code example (views.py):
cont = {
'request': request, #important key-value
'your_models_instances': your_models_instances
}
html = render_to_string('your_filter_template.html', cont)
return_dict = {'html': html}
return JsonResponse(return_dict)
In your js file you need to determine relative url "{% url 'name in yours url file'%}"
And in success you need to add next line:
success: function(data){
$(".filter-block").html(data.html);
}
i hope it will help you! Good luck!

session.setAttribute only updates after page reload

I have an ajax request which invokes GetTierNamesServlet:
$('#application').change(function() {
$.ajax({
url : 'GetTierNamesServlet',
data : {
name : $('#application').find(":selected").text()
},
type : 'get',
cache : false,
success : function(data) {
},
error : function() {
alert('error');
}
}).done(function() {
var test = '<c:out value="${tiers}" />';
alert(test)
})
});
GetTierNamesServlet saves 'tiers' to a session attribute as follows and forwards back to the same page (index.html).
HttpSession session = request.getSession(false);
session.setAttribute("tiers", tiers);
getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);
When alert(test) is called, it alerts the selected tiers from the previous time the ajax request was processed.
The session attribute 'tiers' always seems to "lag" one refresh behind.
What am I doing incorrectly here? I would expect that by placing the alert within the .done portion of the ajax request it would wait the asynchronous call to return before doing something.
This fragment of JavaScript:
var test = '<c:out value="${tiers}" />';
is rendered with the value of ${tiers} before your servlet is called. If you inspect the HTML on the page you will likely find something like:
...
}).done(function() {
var test = 'null'; // or some other "old" value
alert(test)
})
the JSP content is translated to HTML and sent to the browser (page 1)
some event on page 1 causes the JavaScript to be executed
the AJAX call results in the page being rendered again and returned to the browser (page 2)
the JavaScript in page 1 finishes executing via the .done(...) function.
You AJAX call is returning a page when it should probably return a JSON fragment containing your tiers content which will then be consumed by the .done function.

Django, Ajax- HttpResponse does not send json

Django 1.7.2/ python 3.4
this code is about 'like'.
if user click the 'like' button, ajax calls 'pushLike'.
if the user has liked the article before(saved inside Mysql), delete the row on table(DB).
or if the user is not liking the article, create a row and insert it on the table(DB).
after that, count how many like has beed clicked on that article.
I would like to pass the likeCnt(count) to ajax, and write it on the button.
The likeCnt has the right value(I checked it on the server mysql table).
The button color does change(white to blue, and vise versa), but the text does not change.
It seems like json does not pass to ajax. I tried passing data by 'text' type and it did worked, but i want it by json.
I've tried simplejson, json, mimetype, content_type on HttpResponse.
please help me.
view
#login_required
def pushLike(request):
pk = request.GET['writing_id']
try:
la = LikeArticles.objects.get(user = User.objects.get(username=request.user.username), article_id=pk)
if(la.is_like()):
la.delete()
likeCnt = LikeArticles.objects.filter(article_id=pk).count()
FreeBoards.objects.filter(id=pk).update(like = likeCnt)
else: #Never happens
la.like = True
la.save()
likeCnt = LikeArticles.objects.filter(article_id=pk).count()
FreeBoards.objects.filter(id=pk).update(like = likeCnt)
except ObjectDoesNotExist:
la = LikeArticles(user = User.objects.get(username=request.user.username),
article = FreeBoards.objects.get(id=pk),
like = True,
)
la.save()
likeCnt = LikeArticles.objects.filter(article_id=pk).count()
FreeBoards.objects.filter(id=pk).update(like = likeCnt)
data = {'likeCnt': likeCnt}
# return render(request, url, context)
return HttpResponse(simplejson.dumps(data), mimetype='application/javascript')
javascript
<script type="text/javascript">
$(document).ready(function(){
$('#btn-like').click(function(){
var e = $('#btn-like').css('background-color');
$.ajax({
url : '/sle/freeboards/pushLike/',
data : {'writing_id':{{writing_id}},
},
dataType : "json",
success:function(data){
alert(data.likeCnt);
if(e == 'rgb(59, 89, 152)') {
$('#btn-like').css('background-color', '#ffffff').css('color', '#000000');
$('#btn-like').text(data.likeCnt);
} else {
$('#btn-like').css('background-color', '#3b5998').css('color', '#ffffff');
$('#btn-like').text(data.likeCnt);
}
},
failure: function(data){
alert('fail!!')
}
});
});
});
</script>
you'll want to be sure to set the proper mimetype in your HttpResponse
#login_required
def pushLike(request):
...
# return json -- !!not javascript!!
return HttpResponse(simplejson.dumps(...), mimetype="application/json")
--or--
#login_required
def pushLike(request):
...
# return json -- !!not javascript!!
return JsonResponse({"your": "context dictionary"})
If that doesn't work, have you tried parsing the json with your Jquery code?
ie:
$.ajax({
...
success: function(data){
var response = $.parseJSON(data);
...
}
});
javascript might actually receiving bytes back from whatever you are serving your django app with... so instead of getting JSON back, you're actually getting string that looks like JSON. http://api.jquery.com/jquery.parsejson/

not getting response from ajax call in codeigniter

I am trying to check if the user name is available for use using ajax and codeigniter. I have problem to get the response from the codeingniter controller in my js. file but without success.
Here is the controller function, relevant to the question:
if ($username == 0) {
$this->output->set_output(json_encode(array("r" => true)));
} else {
$this->output->set_output(json_encode(array("r" => false, "error" => "Username already exits")));
}
Rest assured that I do get 1 if username already exists in thedatabase and 0 if it does not exist.
I have the following js.file
// list all variables used here...
var
regform = $('#reg-form'),
memberusername = $('#memberusername'),
memberpassword = $('#memberpassword'),
memberemail = $('#memberemail'),
memberconfirmpassword = $('#memberconfirmpassword');
regform.submit(function(e) {
e.preventDefault();
console.log("I am on the beggining here"); // this is displayed in console
var memberusername = $(this).find("#memberusername").val();
var memberemail = $(this).find("#memberemail").val();
var memberpassword = $(this).find("#memberpassword").val();
var url = $(this).attr("action");
$.ajax({
type: "POST",
url: $(this).attr("action"),
dataType: "json",
data: {memberusername: memberusername, memberemail: memberemail, memberpassword: memberpassword},
cache: false,
success: function(output) {
console.log('I am inside...'); // this is never displayed in console...
console.log(r); // is never shonw in console
console.log(output); is also never displayed in console
$.each(output, function(index, value) {
//process your data by index, in example
});
}
});
return false;
})
Can anyone help me to get the username value of r in the ajax, so I can take appropriate action?
Cheers
Basically, you're saying that the success handler is never called - meaning that the request had an error in some way. You should add an error handler and maybe even a complete handler. This will at least show you what's going on with the request. (someone else mentioned about using Chrome Dev Tools -- YES, do that!)
As far as the parse error. Your request is expecting json data, but your data must not be returned as json (it's formatted as json, but without a content type header, the browser just treats it as text). Try changing your php code to this:
if ($username == 0) {
$this->output->set_content_type('application/json')->set_output(json_encode(array("r" => true)));
} else {
$this->output->set_content_type('application/json')->set_output(json_encode(array("r" => false, "error" => "Username already exits")));
}

AJAX call in expressJS

I can't seem to get the AJAX call correct. There have been other QA that deal with the $.ajax() function but I'm trying to solve this with $.post().
When the form button is clicked the javascript at the head is executed, which includes a $.post(). The url /login is routed through and passed to loginPost function. There a response is determined and sent back to the javascript (right?). Instead, webpage renders the response (pass || fail).
Why isn't the response from the AJAX call being sent back to get processed?
This is a simple example that I am working with to get me better acquainted to how AJAX in expressJS and jQuery work. Any Help is greatly appreciated!
--views/login.jade
script(src='/_js/jquery-1.8.2.min.js')
script
$(document).ready(function(req, res) {
$('#login').submit(function() {
var formData = $(this).serialize();
console.log(formData);
$.post('/login', formdata, processData).error('ouch');
function processData(data, status) {
console.log(status);
console.log(data);
if (data == 'pass') {
$('#content').html('<p>You have successfully loggin in!</p>');
} else {
if (! $('#fail').length) {
$('#formFrame').prepend('<p id="fail">Incorrect login information. Please try again)</p>');
}
}
} //end processData
}); //end submit
}); //end ready
div.main
h1= title
div#formFrame
form(id='login', action='/login', method='POST')
p
label(for='username') Username:
input(id='username', type='text', name='username')
p
label(for='password') Password:
input(id='password', type='password', name='password')
p
input(id='button', type='submit', name='button', value='Submit')
--routes/index.js
app.post('/login', loginPost);
--routes/loginPost
module.exports.loginPost = function(req, res) {
var password = 'admin'
, username = 'user'
, data = req.body;
if (data.username == username && data.password == password) {
res.send('pass');
} else {
res.send('fail');
}
};
You still have to stop the <form> from submitting via its default action, which can be done with event.preventDefault():
$('#login').submit(function(evt) {
evt.preventDefault();
// ...
});
Otherwise, the <form> will redirect the page to its action (or back to the current address if no action was given), interrupting the $.post request.

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