Yahoo! and other websites across the Internet make much of their structured data available to developers, primarily through Web services. To access and query these services, developers traditionally endure the pain of locating the right URLs and documentation to access and query each Web service.

With YQL, developers can access and shape data across the Internet through one simple language, eliminating the need to learn how to call different APIs.

How Do I Get Started?

1. Check out the YQL Console.
2. Read how to access YQL from your application.
3. Get your API Keys to sign your requests if you need them.

1. Removing, Showing or Hiding DOM elements

// Remove Element
$("#div").remove();

// Hide
$("#div").hide();
$("#div").hide("slow");
$("#div").hide("fast");
$("#div").hide(1000);
$("#div").hide(1000, callback); 

// Show
$("#div").show();
$("#div").show("slow");
$("#div").show("fast");
$("#div").show(1000);
$("#div").show(1000, callback);  

// Toggle Hide/ Show
$("#div").toggle();
$("#div").toggle("slow");

2. Select All Check Boxes

// Check
$("#selectList").attr('checked', true); 

// Uncheck
$("#selectList").attr('checked', false);

3. Creating Images on the Fly

$("").attr({ "src": "images/loadingAnimation.gif" }).appendTo("#div");

4. jQuery noConflict used when using other libraries

var $j = jQuery.noConflict();
$j('#div').hide();

5. Getting Selected Radio Button value

$("input[name='id'][checked]").val();

6. Getting Select List values

// Value
$('#selectList').val(); 

// Text value
$('#selectList :selected').text() 

// Multiple Selection
var selections = [];
$('#multipleList :selected').each(function(i, selected){
     selections[i] = $(selected).text();
});

7. Check if checkbox is Checked

$('#checkBox').attr('checked'); 

$('#checkBoxID').is(':checked'); 

$("[:checkbox]:checked").each(
    function() {
    }
);

8. Browser Detection

if( $.browser.safari ) { // Do something }

if ($.browser.msie && $.browser.version > 6 ) { // Do something }

if ($.browser.msie && $.browser.version <= 6 ) { // Do something }

if ($.browser.mozilla && $.browser.version >= "1.8" )  { // Do something }

9. Highlight a Row onClick

$("tr").click(function() {
    $(this).toggleClass("rowActive");
});

/* CSS highlights clicked row */
.rowActive {
    border: 1px solid #333333;
    background-color: #999999;
}

10. Building the DOM Dynamically

$("
").attr({id:"header", "class":"header"}).html("Welcome to my Site!").appendTo(document.body);
$("").attr("src", "images/logo.gif").appendTo("#header");

JavaScript

  var isEventSupported = (function(){
    var TAGNAMES = {
      'select':'input','change':'input',
      'submit':'form','reset':'form',
      'error':'img','load':'img','abort':'img'
    }
    function isEventSupported(eventName) {
      var el = document.createElement(TAGNAMES[eventName] || 'div');
      eventName = 'on' + eventName;
      var isSupported = (eventName in el);
      if (!isSupported) {
        el.setAttribute(eventName, 'return;');
        isSupported = typeof el[eventName] == 'function';
      }
      el = null;
      return isSupported;
    }
    return isEventSupported;
  })();

Use

isEventSupported(<"Type of Event>")

For a more detailed description visit Kangax blog

With this little method writen by John Hann from Unscriptable.com you can add debouncing functionality to your JS methods.

Javascript

var debounce = function (func, threshold, execAsap) {

    var timeout;

    return function debounced () {
        var obj = this, args = arguments;
        function delayed () {
            if (!execAsap)
                func.apply(obj, args);
            timeout = null;
        };

        if (timeout)
            clearTimeout(timeout);
        else if (execAsap)
            func.apply(obj, args);

        timeout = setTimeout(delayed, threshold || 100);
    };

}

Usage

    // using debounce in a constructor or initialization function to debounce
    // focus events for a widget (onFocus is the original handler):
    this.debouncedOnFocus = this.onFocus.debounce(500, false);
    this.inputNode.addEventListener('focus', this.debouncedOnFocus, false);