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JQuery, JSON, AJAX

AJAX: Async JavaScript & XML

• In traditional Web coding, to get information from a database or a file on the server - make an HTML form - GET or POST data to the server (click the "Submit" button) - the browser loads a results page. • Because the server returns a new page each

time the user submits input, traditional web applications can run slowly and tend to be less user-friendly.

AJAX: Async JavaScript & XML

• AJAX does not require the page to be reloaded - Instead JavaScript communicates directly with the server using the XMLHttpRequest object • The user will stay on the same page, and he or she will not notice that scripts request pages, or send data to a server in the background. • Because its asynchronous, the browser is not locked up

XMLHttpRequest or JQuery

• Methods to handle comms - Very tedious • JQuery $.ajax({

url: 'document.xml', type: 'GET', dataType: 'xml', timeout: 1000, error: function(){alert('Error loading XML'); }, success: function(xml){do something} });

Example Success Function

success: function(xml){

$(xml).find('item').each(function(){ var item_text = $(this).text(); $('

  • ') .html(item_text) .appendTo('ol'); }); }

    Simpler AJAX

    • Often, you simply need to pass some parameters to a page on the server. • $.post('save.cgi', {text: 'my string', number: 23}, function() {alert('Your data has been saved.');});!

    Simplest AJAX

    • A common use of Ajax is to load a chunk of HTML into an area of the page. To do that, simply select the element you need and use the load() function.

    $('#stats').load('stats.html');

    Trouble with AJAX

    • Two problems with AJAX - Security model - XML • Most browsers prohibit AJAX calls to different domains • XML is tedious to parse and use - Can serialise data as JavaScript objects!

    JSON: JavaScript Object Notation

    • Basic types are

    - Number integer, real, or floating point - String double-quoted Unicode with backslashes - Boolean true and false - Array ordered sequence of comma-separated

    values enclosed in square brackets - Object collection of comma-separated "key":value pairs enclosed in curly brackets - null

    JSON: JavaScript Object Notation

    { "firstName": "Leslie", "lastName": "Carr", "age": 43, "address": { !"streetAddress": "21 Foo Str, !"city": "New York" "powers": [1, 2, 4, 8, 16, 32] var p = eval("(" + JSON_text + ")");!alert(p.age);!

    JSON-P: JavaScript Object Notation

    foo( { "firstName": "Leslie",! "lastName": "Carr", "age": 43, "powers": [1, 2, 4, 8, 16, 32] • Bypasses security by pretending to be a script • API calls have a callback=foo parameter - i.e. client tells the server what callback to invoke on the returned data

    JSON/JQuery Flickr Example

    $.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=?", function(data){ $.each(data.items, function(i,item){ $("").attr("src", item.media.m).appendTo("#images"); if ( i == 3 ) return false; }); });

    EPrints

    $(document).ready(function(){

    $.getJSON("http://www.edshare.soton.ac.uk/cgi/search/simple/export_edshare_JSON.js?exp=.....comp3001...&jsonp=?", function(data){ $.each(data, function(i,item){ $("").

    $("").

    bind("error",function(){$(this).addClass("hidden")}) ).appendTo("#lectures"); }); }); });

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