Is it possible to:
From within my webpage, get all the HTML source from another webpage. I need to do this in order to pass that other pages html source to my function.
The following different attempts don't work:
var html = $.get("http://simplyrecipes.com/recipes/braised_turkey_legs/").html();
var html = $.get("http://simplyrecipes.com/recipes/braised_turkey_legs/");
var html = $("http://simplyrecipes.com/recipes/braised_turkey_legs/").html();
Using Ajax, and get is just a shortcut for ajax, it's not really possible to get the source html from other domains, if that is what your trying to do? as ajax has a same origin policy for security reasons.
However going thru YQL it is possible to do is, read this to see how, or you could proxy with php or something else, with just regular get requests however it's not doable.
If the pages you are trying to get are on your domain, .load(); would probably be better.
Javascript has a same origin policy, this is what's holding you back.
jQuery's get function does not return the loaded data - rather, it calls a callback function and passes the data as a parameter.
This is from the documentation:
$.get('ajax/test.html', function(data) {
$('.result').html(data);
alert('Load was performed.');
});
P.S.: Note that in any case this will only work on the same domain, as cross-domain AJAX is normally not supported for security reasons.
Related
So I have this function that gets innerHTML from the site I'm in:
document.getElementById('go').onclick = function(){
alert(document.getElementById('hourbyhour_details').innerHTML);
};
However that's not what I need, I want to get the innerHTML of another site I'm not in. I can use a WebRequest and a StreamReader to read the source code of the page I want and store it in a String, is there a way to send this String to the function? Or Is there just another way to get specific content like that but from a remote site, and not necesarily the one I'm in?
Thanks!
You are going to have to get around the same-origin policy to do this in Javascript. You can see more here:
Same-origin Policy
One way to get around this is JSONP, the other way is have a server-side script return the information you want from your domain. Good luck.
I'm trying to load an external page using JSONP, but the page is an HTML page, I just want to grab the contents of it using ajax.
EDIT: The reason why I'm doing this is because I want to pass all the user information ex: headers, ip, agent, when loading the page rather than my servers.
Is this doable? Right now, I can get the page, but jsonp attempts to parse the json, returning an error: Uncaught SyntaxError: Unexpected token <
Sample code:
$.post('http://example.com',function(data){
$('.results').html(data);
},'jsonp');
I've set up a jsfiddle for people to test with:
http://jsfiddle.net/8A63A/1/
http://en.wikipedia.org/wiki/JSONP#Script_element_injection
Making a JSONP call (in other words, to employ this usage pattern),
requires a script element. Therefore, for each new JSONP request, the
browser must add (or reuse) a new element—in other words,
inject the element—into the HTML DOM, with the desired value for the
"src" attribute. This element is then evaluated, the src URL is
retrieved, and the response JSON is evaluated.
Now look at your error:
Uncaught SyntaxError: Unexpected token <
< is the first character of any html tag, probably this is the start of <DOCTYPE, in this case, which is, of course, invalid JavaScript.
And NO, you can't use JSONP for fetching html data.
I have done what you want but in my case I have control of the server side code that returns the HTML.
So, what I did was wrapped the HTML code in one of the Json properties of the returned object and used it at client side, something like:
callback({"page": "<html>...</html>"})
The Syntax error you are facing it's because the library you're using expects json but the response is HTML, just that.
I've got three words for you: Same Origin Policy
Unless the remote URL actually supports proper JSONP requests, you won't be able to do what you're trying to. And that's a good thing.
Edit: You could of course try to proxy the request through your server …
If you really just want to employ the client to snag an HTML file, I suggest using flyJSONP - which uses YQL.. or use jankyPOST which uses some sweet techniques:
jankyPOST creates a hidden iframe and stuffs it with a form (iframe[0].contentWindow.document.body.form.name).
Then it uses HTML5 (watch legacy browsers!) webMessaging API to post to the other iframe and sets iframe's form elements' vals to what u specified.
Submits form to remote server...done.
Or you could just use PHP curl, parse it, echo it, so on.
IDK if what exactly ur using it for but I hope this helps.
ALSO...
I'm pretty sure you can JSONP anything that is an output from server code. I did this with ClientLogin by just JSONPing their keyGen page and successfully consoleLogged the text even though it was b/w tags. I had some other errors on that but point is that I scraped that output.
Currently, I'm trying to do what you are so I'll post back if successful.
I don't think this is possible. JSONP requires that the response is rendered properly.
If you want another solution, what about loading the url in an iframe and trying to talk through the iframe. I'm not 100% positive it will work, but it's worth a shot.
First, call the AJAX URL manually and see of the resulting HTML makes sense.
Second, you need to close your DIV in your fiddle example.
I want to get a short string hosted on a server where I do not have access to the data as XML, JSON, etc. I am trying to use either .load or .ajax to do this. I want to be able to parse the data into a javascipt array. The entire contents of the remote page is text and I am happy to take all of it and remove what I do not need via a small javascript. I have tried:
<script>
$(document).ready(function(){
$("button").click(function(){
$.ajax({url:"http://url:8888/data", success:function(result){
$("div").html(result);
}});
});});
</script>
I have two questions.
1- why does this not work?
2- What would be the best way to store the string in a javascript var?
I am sure JQuery is working correctly.
The answer would be to long to post here (really). But look those up:
Same Origin Policy
Padded JSON
If you have no control over the remote site, you have lost - you will not get any data from it by Ajax (which is actually a feature, not a limitation of the technology). One way of circumventing the protection would be to build a proxy that just mirrors the remote service you need to reach and makes it available in the same domain that your main HTML came from.
I have a form that uploads a file in an firame to a remote server. As a result at the submission url server returns json data with the result of operation, which my iframe catches.
{'result': 'true' or 'false'}
Now I'd like to retrieve this json as the callback of my iframe. I know that I need jsonp to achieve this since it's a cross-site call. Here's my function with sample code from IBM' site :
function fileUploadFunction(){
var fileUploadForm = $('#file_upload_form');
fileUploadForm.attr('action', uploadURL);
fileUploadForm.submit();
$('#upload_target').load(function () {
alert("IFrame loaded");
$.getJSON(uploadUrl+"&callback=?", function(data) {
alert("Symbol: " + data.symbol + ", Price: " + data.price);
});
});
};
But here few problems arise. First - my uploadUrl is just "http://something/" . Do I need it to support calls with $callback= suffix ?
Secondly - server gives response only as a result to file upload. So I need to get the result that is stored in my iframe and not at the specified url. How to solve this ?
Here's the link. Notice hidden iframe inside the form. Result from server shows there. :
http://ntt.vipserv.org/artifact/
EDIT
I've previously tried :
$('#upload_target').load(function () {
var ret = frames['upload_target'].document.getElementsByTagName("body")[0].innerHTML;
var data = eval("("+ret+")");
});
But it raises 'permissions denied' error.
This is easily done with easyXDM and there is actually a blog post about this exact use case here.
In essence what it does is use cross-domain messaging to relay the response to the invoking document.
Update: Here is a link for this in action, the source can be found at github, the files are prefixed 'upload_'.
Sean's easyXDM recommendation is a great option (& should probably be marked as correct), but I wanted to suggest another light-weight solution that I haven't seen anyone use.
In cases where you're posting to a hidden iframe on another domain & just need a single response back (not two-way communcation), you could pass a message from the iframe to the parent using a busted url. Here's an example:
the parent loads an iframe on different domain
the parent polls myframe.contentWindow.location.href (constantly getting Permission denied errors since the frame is on another domain)
iframe processes, then redirects to
http://parentdomain.com/pagethatdoesnotexist?{'result':'ok'}
iframe gets a 404 but now the location is available to the parent
the parent reads the message from the iframe's URL
one possible solution could be to set the name of the iframe with pure js. This name could be read from the wrapping parent page.
Looks to me that your code will request uploadURL twice: first, .submit() do a POST request to upload the file and the result is shown in the iframe as a webpage; second, .getJSON() do a GET request and the result is executed as javascript in <script>. You will realize this if you open up Firebug while testing your app.
Since two of the requests are independent, I have no idea how .getJSON() will give you any information about the file you just uploaded with .submit().
For these kind of cross-domain communication, I would suggest using postMessage; otherwise you will need to change you application workflow to do everything in the iframe after file have uploaded; e.g. do <script>alert('Submission accepted');</script> in the iframe.
What are you trying to do after a user have successfully upload a file?
dont use .html() at all.
I used
jQuery('.someElement')
and it worked for me. you can save the result in a variable and insert it in new element
e.g
var = jQuery('.someElement');
jQuery('.newElement').html(var);
I could just create a form and use that to do a POST request to any site, thing is the FORM method isn't asynchronous, I need to know when the page has finished loading. I tried messing around with this using an iframe with a form inside, but no success.
Any ideas?
EDIT
unfortunately I have no control over the response data, it varies from XML, json to simple text.
You can capture the onload event of an iframe. Target your form to the iframe and listen for the onload. You will not be able to access the contents of the iframe though, just the event.
Try something like this:
<iframe id='RS' name='RS' src='about:blank' onload='loaded()'></iframe>
<form action='wherever.php' target='RS' method='POST'>...</form>
script block:
var loadComplete = 0
function loaded() {
//avoid first onload
if(loadComplete==0) {
loadComplete=1
return()
}
alert("form has loaded")
}
IF you want to make cross domain requests you should either made a JSON call or use a serverside proxy. A serverside proxy is easy to set up, not sure why people avoid it so much. Set up rules in it so people can not use the proxy to request other things.
If the data returned from the cross domain post is JSON, then you can dynamically add a script tag pointing to the URI that returns the data. The browser will load that "script" which then you can access from other javascript.
YUI3's IO object offers cross-domain requests, however it does so using a small Flash control it embeds on the page.
While there is work going into secure cross-domain requests from JavaScript, at this time, you need to use a plugin like Flash or Silverlight as a bridge with which to make the request.
You can't do anything cross-domain using javascript. You'd have to use a backend language like PHP or asp or something.