How to preload the entire website like gmail does? How to show this in progress bar? What are the mechanisms used to get this effect?
I can use jquery, jquery UI, php. Will this be enought to create this?
I'm quite sure Gmail is built using the Google Web Toolkit, which essentially means that your whole application is contained in JavaScript files.. in fact the initial page source of Gmail is practically empty.
This post will probably help: GMail like file upload progress bar with GWT?
idea behind showing progress bar while page is loading....simply start loading bar and hide when $(document).ready(); All the others things after that are made with hashbang / hashtag. Here is exactly what you are looking for
Related
This question may seem off-leading but I want to convert my website in to an actual android app. There were suggestions that I should just create a custom-web browser and that the address will then lead to my website which of course looks like the app is the website itself, but what if I'd like to "convert" like code-for-code in to android's IDE? Is this possible?
Because when I stick to the "browser" method, sometimes, since it has to load the HTML, CSS, JS and etc. I'd like to make it "rooted" to the Android app like it's already there so that when it connects to the internet, it will only get my MSQL data and skip the whole HTML, CSS, ... loading stuffs everytime they visit my page.
Is there any way to achieve something like this?
You can try at webview. It is a View that displays web pages. This class is the basis upon which you can roll your own web browser or simply display some online content within your Activity. It uses the WebKit rendering engine to display web pages and includes methods to navigate forward and backward through a history, zoom in and out, perform text searches and more.
You can explore from the following link:
https://developer.android.com/reference/android/webkit/WebView.html
The simplest way is to use ionic/cordova to create a webview that will browse the live website on the app load. Alternatively you can use online service such as applika.me that does more of the same.
I have searched about that for very long time. But I havn't known how it works and how to create it. I am so serious to get it. I am a beginner of Ajax and JQuery. I wish to create a fixed mp3 music player in my web. Although I have some code and know how to do mp3 player for html5, but I have not knew how to do fixed mp3 player which won't change playing when another pages load. Could you help me, please. Example: it is like of www.revernation.com and facebook's chat popup box, still active without refreshing another pages.
You can't keep an mp3 player running when the user navigates to a completely different site in the same browser window.
You can however keep the current page open and fake navigation to other subpages of your own site with History API + AJAX and DOM manipulation. The trick is sometimes called pjax.
An example implementation: https://github.com/defunkt/jquery-pjax
Angular.js does what is described in the previous answer.
What you need to do is convert your app into an SPA.
Single-Page Applications (SPAs) are Web apps that load a single HTML
page and dynamically update that page as the user interacts with the
app. SPAs use AJAX and HTML5 to create fluid and responsive Web apps,
without constant page reloads. However, this means much of the work
happens on the client side, in JavaScript.
Best for SPA
i suggest you to go with AngularJS.
You can still do it with JQuery with Ajax calls if you don't want to use other front-end frameworks
I realized that many of web app use # in their app's URL.
For example, Google Analytics.
This address is in the URL bar when I am viewing the visitor's language page:
https://www.google.com/analytics/web/?hl=en#report/visitors-language/a33185827w60383872p61754588/
This address is in the address bar when I am viewing the visitors' geolocation page:
https://www.google.com/analytics/web/?hl=en#report/visitors-geo/a33185827w60383872p61754588/
I think that this is the Google Analytics web app passing #report/visitors-language and #report/vistiors-geo.
I know that Google analytics is using an <iframe>. It seems that only the main content box is changing when displaying content.
Is # used because of the <iframe> functionality?
There are several answers but none cover the backend part.
Here is a URL, one from your own example:
www.google.com/analytics/web/?hl=en#report/visitors-language/a33185827w60383872p61754588/
You can think about the post-hash (including the hash #) part as a client-side request.
The web server will never know what was entered after the hash sign. It is the browser pointing to a specific ID on the page.
For basic web pages, if you have this HTML: <a name="main">welcome</a>
on a web page at www.example.com/welcome, going to www.example.com/welcome#main will scroll your browser viewport to the welcome text in the <a> HTML tag.
The web server will not know whether #main was in the URL or not.
Values in the URL after a question mark are called URL parameters, e.g. www.example.com/?foo=bar. The web server can deliver different content based on those values.
However, there is a technology developed by Google called AJAX (Asynchronous JavaScript and XML) that makes use of the # part in the URL to deliver different content without a page load. It's not using an <iframe>.
Using JavaScript, you can trigger a change in the URL's post-hash part and make a request to the server to get a specific part of the page, for example for the URL www.example.com/welcome#main2 Even if an element named #main2 does not exist, you can show one using JavaScript.
A hashbang is #!. It is used to make search engine indexing easier by indicating that this part is a dynamic web page.
This is the "hash" in the url.
Many browsers support hash change event in javascript.
as per my knowledge the hash change is the revolution in the ajax callbacks.
as such when the user interacts with the any link with a hash then on the hash change the event is fired and you can apply any thing with the javascript.
one more thing is that hash change is supported by the browser history.
see below URL
SEO and the use of !# in a url
or Read it
'#! is called a "hashbang" and they are the root of all that is evil in web development.'
Basically, weak web developers decided to use #anchor names as a kludgy hack to get "web 2.0" things to work on their page, then complained to google that their page rank suffered. Google made a work around to their kludge by enabling the hashbang.
Weak web developers took this work around as gospel. Don't use it. It is a crutch.
Web development that depends on hashbangs is web-development done wrong.
This article is far more well worded than I could ever be, and deals with the Gawker media fiasco from their migration to a (failed) hashbang centric website. It tells you WHAT is happening and why it's bad.
http://isolani.co.uk/blog/javascript/BreakingTheWebWithHashBangs
Correct me if I'm wrong, the hashtag in that URL would be used as an anchor to scroll the page to an element with an id. For example, I send you to the url http://example.com/sample#example, and the page would scroll (just display) at the element (I'm using a div as an arbitrary example, it could be anything).
Ajax and hash mark in the url mostly used for quick action.
If you have a part in your site that can be visible only by fire event (mostly click) - it would be hard to share it. With hash mark in the url you can (by javascript) make the browser think that you did the required action and it will display the relevant part.
Normally the '#' is using in url will find the particular id which is next to '#' in that particular page. By using this we can view the particular content at middle of the page also.
So I understand this may come across as a open question, but I need away to solve this issue.
I can either make the site do ajax request that load the body content, or I can have links that re-loads the whole page.
I need the site to be SEO compliant, and I would really like the header to not re-load when the content changes, the reason is that we have a media player that plays live audio.
Is there away that if Google BOT or someone without ajax enabled it does the site like normal href but if ajax or javascript allowed do it the ajax way.
Build the website without JS first, ensure it works as wished, each link linking a new unique page. Google parses your site without JS, so what you see with JS off is what he sees.
Then add the JS, with click handlers to prevent the default page reload and do your ajax logic instead. You could use JQuery and .load() to do this quite easily.
Other solution, you could use the recommended Google method ( https://developers.google.com/webmasters/ajax-crawling/ ), but it's more work and less effective SEO-wise.
Or you can put your audio player in a iFrame...
I'm new to YQL, and just trying to learn how to do some fairly simple tasks.
Let's say I have a list of URLs and I want to get their HTML source as a string in javascript (so I can later insert it to a database via ajax). How would I go about getting this info back in Javascript? Or would I have to do it in PHP? I'm fine with either, really - whatever can work.
Here's the example queries I'd run on their console:
select * from html where url="http://en.wikipedia.org/wiki/Baroque_music"
And the goal is to essentially save the HTML or maybe just the text or something, as a string.
How would I go about doing this? I somewhat understand how the querying works, but not really how to integrate with javascript and/or php (say I have a list of URLs and I want to loop through them, getting the html at each one and saving it somewhere).
Thanks.
You can't read other pages with Javascript due to a built-in security feature in web browsers. It is called the Same origin policy.
The usual method is to scrape the content of these sites from the server using PHP.
There is an other option with javascript called a bookmarklet.
You can add the bookmarklet in your bookmarks bar, and each time you want the content of a site click the bookmark.
A script will be loaded in the host page, it can read the content and post it back to your server.
Oddly enough, the same origin policy, does not prevent you to POST data from this host page to your domain. You need to POST a FORM to an IFRAME that has a source hosted on your domain.
You won't be able to read the response you get back from the POST.
But you can poll with a setInterval making a JSONP call to your domain to know if the POST was successful.