Access DOM Content of a specific URL without directly opening the page - javascript

How would I go about saving a URL's DOM to a variable without directly opening that page? For example, let's say I have a Chrome extension that allows the user to right click text, search Google, and alert the user with the first result. How would I do this without opening the search results in another tab? Is there any function like saveDOMContent("http://www.google.com/search?q=test") (Note: not a real function) that can do this in pure Javascript?

function getPage(){
var somediv =$('#somediv');
var url='someurl';
var options = {
method:'get',
onSuccess: function(transport){
somediv.innerHTML=transport.responseText;
}
};
new Ajax.Request(url,options);
}
Try something like this, but can not say the same for some cross domain calls

Related

Why opening a product page in eBay redirects to a different URL?

When I open the following url in browser,
http://pages.ebay.com/link/?nav=item.view&id=141628727383&alt=web
It redirects to a different url
http://www.ebay.com/itm/141628727383
What's the mechanism?
Because it uses some kind of JS redirection:
var eULin;
window.onload = function() {
eULin = new eUL();
eULin.version = '1.4.1+1424198141014';
eULin.redirect();
}
eUL is defined in http://pages.ebay.com/link/univlink.min.js
eUL.prototype.redirect calls eUL.prototype.winRedirect, which calls location.replace. That replaces the current page with a new one, in a way that the current one won't be accessible using the back button.

Reload a page inside iframe

I have an iframe and I want to reload the currently displayed page on button press.
HTML:
<iframe id="webView"></iframe>
JS:
function reloadPage()
{
var webView = document.getElementById("webView");
//CODE
}
Inside the reloadPage() method I tried different solutions:
Call reload()
webView.contentWindow.location.reload();
This just doesn't work because the pages loaded inside the iframe are from a different domain than the main page.
Set src
webView.src = wevView.src;
It gives wrong result because it contains the initial url that I set to the iframe, non the current one.
Set location
webView.contentWindow.location = webView.contentWindow.location
I was expecting it to not work with urls from different domains (the same as calling reload()), but actually it works and also gives a good result.
Good but not perfect: the location object holds the current url but strips any parameter.
For example if the frame is currently displaying the following url:
http://www.myserver.com/thatsite/?page_id=11
the location object contains this url:
http://www.myserver.com/thatsite/
So this one works well as long as there are no parameters in the url.
Better solution?
I rely heavly on urls with parameters (mostly WordPress installations) so i need a way to keep them while reloading.
Anyone knows a solution to achieve this?
just not possible, see this thread:
Get current URL from IFRAME
and this one
How do I get the current location of an iframe?
Since setting location works, you could use location.search to retrieve the GET parameters and reconstruct the URL that way.
Example:
webView.contentWindow.location = webView.contentWindow.location + webView.contentWindow.location.search

Is it possible to trigger behavior in the content script from the popup?

Currently I am using message passing to send a request from my contentscript for data in localStorage and I am not having any issues with that, the content script is working as expected.
Can you do this in the other direction?
I have an object that exists in the content script that has a method called ".apply()" and I want to run it when the used clicks the option to do so.
I tried to make a listener in the content script like this:
var myLinker = new Linker();
chrome.extension.onRequest.addListener(function(request) {
if (request.method == "apply")
{
myLinker.apply("nothing");
alert("applied");
}
else
; //Do nothing
And send requests to it like this:
chrome.extension.sendRequest({method: "apply"}, function(){
alert("Tried to request");
});
I get that it is a bit of a hack, but it is the only thing I could think of, and it doesn't even work =/
Is there a way to do this?
I am pretty sure I could just inject new code into the page from the popup (I think I saw an api function for that), and then run stuff, but that would take more memory and just feels like a bad way to do it, because you would basically have the exact same code twice.
To send a message from the extension to a content script, use chrome.tabs.sendMessage instead of chrome.extension.sendRequest.
Because sendRequest has been superseded by onMessage in Chrome 20, there's no official documentation for sendRequest any more. The documentation for chrome.tabs.sendMessage can be found here. Please note that these events cannot be mixed, use either *Request or *Message.
Yes, you would use this: http://developer.chrome.com/extensions/tabs.html#method-sendMessage
Content scripts live within the DOM of the page. And each page that is open within Chrome has a tab ID associated with it -- http://developer.chrome.com/extensions/tabs.html#type-tabs.Tab
Let's say you want to send the {method: "apply"} to a page that was just opened in a new tab:
chrome.tabs.onCreated.addListener(function(tab) {
chrome.tabs.sendMessage(tab.id, { method: "apply" });
});
There are other events/methods to get the specific Tab you want to send the message to. I think there's one called getCurrent to send to the currently selected tab, check out the docs for that.

Javascript bookmarklet to take info from one page and submit it to form on another page

Now that I discovered here that I can't write JavaScript within one page to enter form data on another external page, I'd like to do this with a browser-based bookmarklet instead.
I'm able to access the data on my original page with this bookmarklet code snippet:
javascript:var%20thecode=document.myForm.myTextArea.value;
If I open the external Web-based form manually in the browser, this code changes what's in the text box:
javascript:void(document.externalForm.externalTextArea.value="HELLO WORLD"));
And this bookmarklet code will open a new browser window with the external form:
javascript:newWindow=window.open("http://www.url.com","newWindow");if(window.focus){void(newWindow.focus());}
However, when I try to put these snippets together in a single bookmarklet to open the external form in a new window and change the data inside, I can't access any of the elements in newWindow. For example, this doesn't work to check the existing value of the text area in the new window
javascript:var%20newWindow=window.open("http://www.url.com","newWindow");if(window.focus){void(newWindow.focus());}window.alert(newWindow.document.externalForm.externalTextArea.value);
Once I use the bookmarklet code to open the new window as newWindow, I don't seem to be able to access the elements within that new window. Any suggestions what I'm missing? Thanks.
That's because the bookmarklet runs within the sandbox (the environment) of the current web page. Since you're not allowed to access (the DOM of) another page which doesn't have the same protocol, domain name and port, you're not able to access the document property of newWindow when protocols, domains and ports don't match. BTW, the same is true for accessing iframes on a page.
As you're talking about an “external form”, I guess you don't stay on the same domain. The other examples retrieve or manipulate data on the current page (at that moment) and won't error out.
Also see Same origin policy.
Update: About the Delicious (et al.) bookmarklet: its code actually reads:
(function () {
f = 'http://delicious.com/save?url=' + encodeURIComponent(window.location.href) + '&title=' + encodeURIComponent(document.title) + '&v=5&';
a = function () {
if (!window.open(f + 'noui=1&jump=doclose', 'deliciousuiv5', 'location=yes,links=no,scrollbars=no,toolbar=no,width=550,height=550'))
location.href = f + 'jump=yes'
};
if (/Firefox/.test(navigator.userAgent)) {
setTimeout(a, 0)
} else {
a()
}
})()
So, yes, the parameters are only transferred using a GET request.

How to use javascript to get information from the content of another page (same domain)?

Let's say I have a web page (/index.html) that contains the following
<li>
<div>item1</div>
details
</li>
and I would like to have some javascript on /index.html to load that
/details/item1.html page and extract some information from that page.
The page /details/item1.html might contain things like
<div id="some_id">
picture
map
</div>
My task is to write a greasemonkey script, so changing anything serverside is not an option.
To summarize, javascript is running on /index.html and I would
like to have the javascript code to add some information on /index.html
extracted from both /index.html and /details/item1.html.
My question is how to fetch information from /details/item1.html.
I currently have written code to extract the link (e.g. /details/item1.html)
and pass this on to a method that should extract the wanted information (at first
just .innerHTML from the some_id div is ok, I can process futher later).
The following is my current attempt, but it does not work. Any suggestions?
function get_information(link)
{
var obj = document.createElement('object');
obj.data = link;
document.getElementsByTagName('body')[0].appendChild(obj)
var some_id = document.getElementById('some_id');
if (! some_id) {
alert("some_id == NULL");
return "";
}
return some_id.innerHTML;
}
First:
function get_information(link, callback) {
var xhr = new XMLHttpRequest();
xhr.open("GET", link, true);
xhr.onreadystatechange = function() {
if (xhr.readyState === 4) {
callback(xhr.responseText);
}
};
xhr.send(null);
}
then
get_information("/details/item1.html", function(text) {
var div = document.createElement("div");
div.innerHTML = text;
// Do something with the div here, like inserting it into the page
});
I have not tested any of this - off the top of my head. YMMV
As only one page exists in the client (browser) at a time and all other (virtual/possible) pages are on the server, how will you get information from another page using JavaScript as you will have to interact with the server at some point to retrieve the second page?
If you can, integrate some AJAX-request to load the second page (and parse it), but if that's not an option, I'd say you'll have to load all pages that you want to extract information from at the same time, hide the bits you don't want to show (in hidden DIVs?) and then get your index (or whoever controls the view) to retrieve the needed information from there ... even though that sounds pretty creepy ;)
You can load the page in a hidden iframe and use normal DOM manipulation to extract the results, or get the text of the page via AJAX, grab the part between <body...>...</body>¨ and temporarily inject it into a div. (The second might fail for some exotic elements like ins.) I would expect Greasemonkey to have more powerful functions than normal Javascript for stuff like that, though - it might be worth to thumb through the documentation.

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