Asked  7 Months ago    Answers:  5   Viewed   43 times

What I want is to have links which change a part of the page , and a dynamic URL for it, where I can specify variables such like #calendar=10_2010tabview=tab2

Check this for an exact example: CLICK HERE FOR EXACT DEMO

So here is the link format what I need:

#calendar=10_2010&tabview=tab2

I need to have variables in the links like calendar and tabview so I can change multiple things on a single page without realoading.


Or another format such like on http://www.wbhomes.com.au , this is exactly what I want, however the first format is good too but this is much more beautiful.

  • http://wbhomes.com.au/#/propertiesforsale/houseandland/quinnsbeach-waterland1

Requirements

  • Needs to be accessed from anywhere from example a mail, or if I just write in the url bar.

  • The link should be in the history, so if If I push the back or forward button the page needs to be accessed.

  • Page refresh needs to work too.


Some recources:

Examples:

  • www.developer.yahoo.com/

  • www.facebook.com - the sidebar links on your profile page

  • www.wbhomes.com.au/ - 100% close to what I want

  • www.flickr.com/

  • www.youtube.com

Some Tutorials:

  • www.ajaxpatterns.org/

  • www.contentwithstyle.co.uk/


Please help me! I've never found any solution to do this, but I don't want to use jquery or any API, or any library, I want to have a working Javascript/AJAX and PHP script.

 Answers

26

For the demo linked in your question, achieving that functionality is actually really simple - as it doesn't use any AJAX at all (when you start to add AJAX to the mix, it get's more difficult - explained later). To achieve that functionality you would; upgrade your links to use hashes, then bind into the hashchange event. Unfortunately the hashchange event is not cross-browser compatible, though luckily there are many "history/remote plugins" available - our preferred one over the years has proven to be jQuery History, it's open-source, got great support and is actively developed :-).

Although, when it comes to adding AJAX functionality to the mix like such sites as Facebook, WBHomes and Balupton.com then you will start to face a whole series of seriously difficult problems! (I know as I was the lead architect for the last two sites!). Some of these problems are:

  • How to gracefully and easily upgrade certain internal links to use the History and AJAX functionality, and detect when the hash has changed? while keeping other links working just like before.
  • How to redirect from "www.yoursite.com/myapp/a/b/c" to "www.yoursite.com/myapp/#/a/b/c"? and still keep the experience smooth for the user such that the 3 necessary redirects are as smooth as possible.
  • How to submit form values and data using AJAX and update the hash? and vice versa if they don't support Javascript.
  • How to detect which particular area of the page the AJAX request is wanting? Such that subpages are displayed with the correct page.
  • How to change the page title when the AJAX state changes? and other non-page content.
  • How to perform nice intro/outro effects while the AJAX state loads and changes? such that the user isn't left in the dark.
  • How to update the sidebar login info when we login via AJAX? As obviously we don't want that login button up the top left to be there anymore.
  • How to still support the website for users that do not have JS enabled? Such that it gracefully degrades and still is indexable by Search Engines.

The only open-source and reliable project I know of which tries to solve all those extremely difficult problems mentioned has proven to be jQuery Ajaxy. It's effectively an extension to the jQuery History project mentioned before, providing a nice elegant high level interface to add AJAX functionality to the mix to take care of those difficult problems behind the scenes so we don't have to worry about them. It's also the chosen solution used in the last few commercial sites mentioned earlier.

Good luck, and if you have any further questions then just post a comment on this answer and I'll get to it asap :-)

Update: There is now the HTML5 History API (pushState, popState) which deprecates the HTML4 hashchange functionality. History.js is now the sucessor to jQuery History and provides cross-browser compatibility for the HTML5 History API and an optional hashchange fallback for HTML4 browsers. jQuery Ajaxy will be upgraded for History.js

Wednesday, March 31, 2021
 
codingb
answered 7 Months ago
44

Here is how the referred code example supposed to work:

product-category.php

<?php
define( 'INCLUDE_DIR', dirname( __FILE__ ) . '/' );

$rules = array( 
    'redirect-category'  => "/product-category\.php\?cat_id=(?'category'\d+)"
);

$uri = $_SERVER['REQUEST_URI'];
$uri = urldecode( $uri );

foreach ( $rules as $action => $rule ) {
    if ( preg_match( '#'.$rule.'#', $uri, $params ) ) {
        include( INCLUDE_DIR . $action . '.php' );
        exit();
    }
}

redirect-category.php

<?php
$categories = array(
    2 => 'men-items'
);
header("Location: " . preg_replace( '#'.$rule.'#', "/product_category/{$categories[$params['category']]}/", $uri ));
Saturday, May 29, 2021
 
the_e
answered 5 Months ago
70

Make JSONP calls. JSONP calls are not real ajax requests (because they don't use XMLHttpRequest object, and they simply inject a script tag into the DOM). But they won't be shown in Firebug.

Tuesday, June 22, 2021
 
Indranil
answered 4 Months ago
85

Ajax requests have usually a X-Requested-With: XMLHttpRequest request header. In JSF, you can obtain the request headers by ExternalContext#getRequestHeaderMap().

ExternalContext externalContext = facesContext.getExternalContext();
Map<String, String> headers = externalContext.getRequestHeaderMap();
boolean ajax = "XMLHttpRequest".equals(headers.get("X-Requested-With"));
Wednesday, June 30, 2021
 
Sabya
answered 4 Months ago
86

Oh yes - it's becoming a common pattern to handle page-state-to-URL persistence when content is AJAX driven.

Javascript can access this value via window.location.hash. Once that's done, you can perform any actions based on the value of that hash

  • Show/hide nodes
  • Makes other AJAX calls
  • Change page titles or colors
  • Swap images
  • etc

Really, any DHTML effect.

Thursday, August 19, 2021
 
Puneet
answered 2 Months ago
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