Our site uses Facebook Connect to allow users to post updates to their Facebook. The javascript that allows this has to be loaded directly through Facebook's Feature loader, and we had been loading it on every page where a user might want to connect to Facebook. Unfortunately, because some users have Facebook blocked at their workplace, this is causing our site to hang for those users.
Ideally, what we'd like to do is to load the js through the feature loader only just before it is actually needed. However, we do not know whether the feature will be needed until after the page on which it will be used is already loaded. Specifically, a user will open up a dialog box and check "publish to facebook" before submitting a form by AJAX (but NOT leaving the page). It is at this point that we'd like both to load the Facebook js, and immediately execute the code to bring up their dialog box. Is there a reasonable way to do this?
Essentially what you want to do is load the js on demand after the page has already been loaded. This is certainly doable; there is a decent article that summarizes how you might accomplish it here:
http://ajaxpatterns.org/On-Demand_Javascript
I also like the following little functions from phpjs.org:
http://phpjs.org/functions/require_once:503
http://phpjs.org/functions/include_once:434
http://phpjs.org/functions/include:433
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I'm implementing Invisible reCAPTCHA on my website, and to reduce the number of third party JS files on page load I'd like to download the https://www.google.com/recaptcha/api.js file only once the user submits a form. Once it loads I would then use grecaptcha.render followed by grecaptcha.execute. I've implemented and tested this, and it works as expected.
My concern is that delaying this file load may negatively affect Google's ability to confirm the user is not a robot. For example, perhaps Google's JS picks up user events while they're using the page and uses those actions to verify the humanness of a user. By delaying the JS load, Google won't have those user events to take into account and may result in more legitimate users getting annoying image challenges.
The docs don't mention anything about this. Does anyone have experience with this implementation? I'd think Google relies on other info like IP address and cookies for this kind of verification, but I want to confirm.
I made a webpage which can provide some direct downloads. Therefore I only want real human, not crawler, to download my files. I tried to use Google reCAPTCHA but it is part of the webpage - visitors can still use the download links and doesn't have to worry about the reCAPTCHA at all. Is there a way to mandate visitors to pass the verification first? For example, is it possible to pop up reCAPTCHA before the whole page is loaded? If that's doable, how can I do it? Thanks!
What I can recommend here is the captcha form be on the current page that you have and create a new page with the download links that's not indexable.
Upon authorizing the captcha code, use header('Location: download.php'); or something similar to redirect the user.
A captcha before loading a webpage is possible, but it always uses client side code such as javascript which bots can easily bypass.
My requirement is to write one script when I run the script it opens the page and fill the fields and automatically take me to next page.
For e.g. Script for www.irctc.co.in. When we login to irctc it ask the user name and password and when click on submit it redirect to next page.
I want to write a script in such a way that I just click on the script it internally does all these things and I could see the next page.
I am unable form where I should start.
I think you are looking for something like Greasemonkey: https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/
Greasemonkey is a Mozilla Firefox extension that allows users to install scripts that make on-the-fly changes to web page content after or before the page is loaded in the browser.
If you use a different browser, then you can refer to: http://en.wikipedia.org/wiki/Greasemonkey#Equivalents_for_other_browsers
Check Watir - Web Application Testing in Ruby. Although it is used for automation, it might solve the purpose here. With Watir, you write scripts in ruby and execute it and then see the magic. More information can be found here
I have a web application where many jquery files needed after login page. Can i include it on the login page so that on the next page the browser don't make a request for the file.
Means the files are used from the browser cache. Is it possible?
Yes, you can (as #Juhana already mentioned).
You can also use a CDN like Google to deliver jQuery or other common libraries. If someone already visited another site including jQuery via Google CDN, it would be already cached by his browser when logging in to your site (if you are also using the CDN of Google).
Yes, it is possible. Since you don't want to slow down login page, it is better to dynamically insert it on the page after it is loaded and rendered so user can interact with it without any delays that loading of this file might impose. Also note that this doesn't give you 100% guarantee that file will be in cache, since browser might choose not to store it or delete it before user visits your next page according to its policies and space limitations.
You can request file anywhere with jquery $.getScript() method. If server caching is ON everything will be fine.
I'm sorry if this is a newbie question but I don't really know what to search for either. How do you keep content from a previous page when navigating through a web site? For example, the right side Activity/Chat bar on facebook. It doesn't appear to refresh when going to different profiles; it's not an iframe and doesn't appear to be ajax (I could be wrong).
Thanks,
I believe what you're seeing in Facebook is not actual "page loads", but clever use of AJAX or AHAH.
So ... imagine you've got a web page. It contains links. Each of those links has a "hook" -- a chunk of JavaScript that gets executed when the link gets clicked.
If your browser doesn't support JavaScript, the link works as it normally would on an old-fashioned page, and loads another page.
But if JavaScript is turned on, then instead of navigating to an HREF, the code run by the hook causes a request to be placed to a different URL that spits out just the HTML that should be used to replace a DIV that's already showing somewhere on the page.
There's still a real link in the HTML just in case JS doesn't work, so the HTML you're seeing looks as it should. Try disabling JavaScript in your browser and see how Facebook works.
Live updates like this are all over the place in Web 2.0 applications, from Facebook to Google Docs to Workflowy to Basecamp, etc. The "better" tools provide the underlying HTML links where possible so that users without JavaScript can still get full use of the applications. (This is called Progressive Enhancement or Graceful degradation, depending on your perspective.) Of course, nobody would expect Google Docs to work without JavaScript.
In the case of a chat like Facebook, you must save the entire conversation on the server side (for example in a database). Then, when the user changes the page, you can restore the state of the conversation on the server side (with PHP) or by querying your server like you do for the chat (Javascript + AJAX).
This isn't done in Javascript. It needs to be done using your back-end scripting language.
In PHP, for example, you use Sessions. The variables set by server-side scripts can be maintained on the server and tied together (between multiple requests/hits) using a cookie.
One really helpful trick is to run HTTPFox in Firefox so you can actually monitor what's happening as you browse from one page to the next. You can check out the POST/Cookies/Response tabs and watch for which web methods are being called by the AJAX-like behaviors on the page. In doing this you can generally deduce how data is flowing to and from the pages, even though you don't have access to the server side code per se.
As for the answer to your specific question, there are too many approaches to list (cookies, server side persistence such as session or database writes, a simple form POST, VIEWSTATE in .net, etc..)
You can open your last closed web-page by pressing ctrl+shift+T . Now you can save content as you like. Example: if i closed a web-page related by document sharing and now i am on travel web page. Then i press ctrl+shift+T. Now automatic my last web-page will open. This function works on Mozilla, e explorer, opera and more. Hope this answer is helpful to you.