Using Ajax in Django is a open Issue. I have tried to understand it by reading blogs and forums, but it didn't work for me. I am posting a very simple question related to it.
Method defined in views.py: (just a sample)
def widget_data(request):
####
extra_context = {
'data': username
'part': company
}
return direct_to_template(request,'test/widgets.html',
extra_context)
I want to load extra_context to rendered template using Ajax.
Following things will happen in widget.html template i.e.
When a moderator will type a URL at the address bar to open a page it will load two widgets i.e. one for loading all the registered username and other one for their company name . user are continuously registering to the sites and adding company name to their profile. When a new user will registered to the site both widget should load automatically using Ajax.
I have no idea about the topic of Ajax.
How to do this?
How should i even start this?
I have read these following links :
Tutorial 1
Tutorial 2
I know that the answer will be too long and too messy but any help will be appreciative.
If you use jQuery you can do the following
$.get('/url/of/widget_data/view', success(data, textStatus, jqXHR) {
$('#idofdivtoupdate').html(data);
});
That would probably be the easiest way to do it.
Related
All the answers I saw here or elsewhere on Google were with jquery. This is not jquery.
I send an ajax string to a php file.
The php, among other things, formulates a message string which I echo
back to the client.
The returned string is put up in the client as an alert.
The form is then reset.
The problem is that when I do this it puts up as much of the page source that the alert can handle. If I open developer tools to look at the return, it puts the message up correctly, not the page source. Here is the return snippet in my ajax:
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
alert(ajaxRequest.responseText);
document.getElementById("thisForm").reset();
}
}
The php file does a simple echo of a text string.
What is it about developer tools that makes this run correctly and why doesn't it print out the message in the alert when developer tools is not there?
When I run the backend php by itself, with or without developer tools, it displays the message properly.
Does anyone have any ideas?
More information: I tried to replace the alert and reset with a
display.innerHTML=ajaxRequest.responseText where display is a javascript object formed from getElementById("ajaxReturn") of a "div id="ajaxReturn". It didn't work. When I tried developer tools, it showed the network response text as being the page source.
I also added && this.status == 200 to the if statement. No change.
The problem is solved. I am not deleting this because it might help some other poster who runs into the same problem. I launched the AJAX with an onclick to a javascript function called ajaxFunction(). The html entity containing the onclick had an href="#" in it. Removing that href solved the problem.
I had the exact same issue and my cause was related to having an extra slash in my URL.
Lets say my URL was:
https://example.com/index.php
I had a wrong link as follows:
https://example.com/index.php/
On both instances my server loads the page,
But the Ajax shows the page source as response for:
https://example.com/index.php/
But works fine for:
https://example.com/index.php
The ajax is essentially posting to index.php/ajaxpage.php which then responds with whats on index.php instead of whats on ajaxpage.php
I am working on codeigniter and I am making a login page. When i validate the credentials I wan to move the user to next view if the credentials are correct.
I am using following command to redirect the user but it is merging the new view to the existing view and the url being shown in the browser is also getting appended.
$this->load->view('DataEntry');
URL before executing this command :http://127.0.0.1:8080/ci/
URL after executing this command : http://127.0.0.1:8080/ci/index.php/CI/DataEntry
how can i redirect the user from one view to another without appending the url and what is the right way to do it ?
I am an abolute beginner. so accept my apologies for dumb questions.
In general, it should be something like this:
//pseudo code
if ($validation_passed)
{
redirect('secret_page_controller/secretpage_method');
}
else
{
//if validation failed
$this->load->view('view_where_login_form_is');
}
Follow basic example from docs.
Please, format your code appropriate and add controller/method(s) code.
I know there are several screen scraping threads on here but none of the answers quite satisfied me.
I am trying to scrape the HTML from an external web page using javascript. I am using $.ajax and everything should work fine. Here is my code:
$.ajax({
url: "my.url/path",
dataType: 'text',
success: function(data) {
var myVar = $.get(url);
alert(myVar);
}
});
The only problem is that it is looking for the specified url within my web server. How do I use a proxy to get to an external web page?
Due to Cross Site Scripting restrictions, you're going to have to pass the desired URL to a page on your server that will query the URL in question from serverside, and then return the results to you. Take a look at the thread below and the incorporate that into your application and have it return the source when that page is hit by your AJAX function.
How to get the HTML source of a webpage in Ruby
Using a GET request is going to the be easiest way to transfer the URL of the page you want to fetch your server so you'll be able to call something like:
$.ajax("fetchPage.rb" + encodeURI(http://www.google.com))
Because you can't access the side in question directly from the server, you're going to have to pipe the serverside script through a proxy for the request to work, which really kind of depends on your setup. Taking a look at the Proxy class in Ruby:
http://ruby-doc.org/stdlib-1.9.3/libdoc/net/http/rdoc/Net/HTTP.html#method-c-Proxy
I am trying to call yahoo api via Ajax to find current weather:
var query = "select * from weather.forecast where location in ('UKXX0085','UKXX0061','CAXX0518','CHXX0049') and u='c'";
var url = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent(query) +'&rnd=1344223&format=json&callback=jsonp1285353223470';
new Ajax.Request(url, {
method: 'get',
onComplete: function(transport) {
alert(transport.Status); // say 'null'
alert(transport.responseText); // say ''
}
});
I noticed, that instead of GET firebug says OPTIONS. What is it and how I can use force prototype to use GET?
Here is functionality which i am trying to recreate.
And here is full URL which I am trying to access:
http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20location%20in%20(%27UKXX0085%27%2C%27UKXX0061%27%2C%27CAXX0518%27%2C%27CHXX0049%27)%20and%20u%3D%27c%27&rnd=1344223&format=json&callback=jsonp1285353223470
After hours of trying to debug the same issue myself, I came to the following conclusion.
I believe this happens because of XSS counter-measures in newer browsers.
You can find very detailed information about these new counter-measures here:
https://developer.mozilla.org/en/http_access_control
Basically, a site can specify how "careful" the browser should be about allowing scripts from other domains. If your site, or a site from which you're loading external JavaScript code, includes one of these pieces of "browser advice", newer browsers will react by enforcing a stronger XSS policy.
For some reason, Prototype's Ajax.Request, under Firefox, seems to react by attempting to do an OPTIONS request, rather than a GET or POST, so perhaps Prototype has not been updated to correctly handle these new security conditions.
At least that was the conclusion in my case. Maybe this clue can help with your case...
I need to crawl a web board, which uses ajax for dynamic update/hide/show of comments without reloading the corresponding post.
I am blocked by this comment area.
In Ajax.request, url is specified with a path without host name like this :
new Ajax(**'/bbs/comment_db/load.php'**, {
update : $('comment_result'),
evalScripts : true,
method : 'post',
data : 'id=work_gallery&no=i7dg&sno='+npage+'&spl='+splno+'&mno='+cmx+'&ksearch='+$('ksearch').value,
onComplete : function() {
$('cmt_spinner').setStyle('display','none');
try {
$('cpn'+npage).setStyle('fontWeight','bold');
$('cpf'+npage).setStyle('fontWeight','bold');
} catch(err) {}
}
}).request();
If I try to access the url with the full host name then
I just got the message: "Permission Error" :
new Ajax(**'http://host.name.com/bbs/comment_db/load.php'**, {
update : $('comment_result'),
evalScripts : true,
method : 'post',
data : 'id=work_gallery&no=i7dg&sno='+npage+'&spl='+splno+'&mno='+cmx+'&ksearch='+$('ksearch').value,
onComplete : function() {
$('cmt_spinner').setStyle('display','none');
try {
$('cpn'+npage).setStyle('fontWeight','bold');
$('cpf'+npage).setStyle('fontWeight','bold');
} catch(err) {}
}
}).request();
will result in the same error.
This is the same even when I call the actual php url in the web browser like this:
http://host.name.com/bbs/comment_db/load.php?'id=work_gallery&..'
I guess that the php module is restricted to be called by an url in the same host.
Any idea for crawling this data ?
Thanks in advance.
-- Shin
Cross site XMLHttpRequest are forbidden by most browsers. If you want to crawl different sites, you will need to do it in a server side script.
As mentioned by darin, the XMLHttpRequest Object (which is the essence of Ajax requests) has security restrictions on calling cross-site HTTP requests, I believe its called the "Same Origin Policy for JavaScript".
While there is a working group within the W3C who have proposed new Access Control for Cross-Site Requests recommendation the restriction still remains in effect for most mainstream browsers.
I found some information on the Mozilla Developer Network that may provide a better explanation.
In your case, it appears that you are using the Prototype JavaScript framework, where Ajax.Request still uses the XMLHttpRequest object for its Ajax requests.
method:'post'
might well be your problem: the host serving the request likely rejects get requests, which is all you can throw at it from a browser address bar. if this is what's happening, you'll need to find or install some sort of scripting tool capable of doing the job (perl would be my choice, and unless you're running Windows, you'll already have that).
I do have to wonder whether what you're trying to do is legit, though: trawling other sites' comment databases isn't usually encouraged.
I would solve this by running a PHP script locally that will do the crawling from outside pages. That way jQuery doesn't have to go to an outside domain.