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// Validate email address
var email = 'info@tympanus.net'
if(!(/^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i.test(email)))
alert('Invalid Email');

// Disable right mouse click
$(document).ready(function(){
    $(document).bind("contextmenu",function(e){
        return false;
    });
});

//Run a function 5 times with intervals of 20 seconds
var count = 0;
function myFunction() {
    count++;
    if(count > 5) clearInterval(timeout);
    //do something
}
var timeout = setInterval(myFunction, 20000);

//Check if an element exists
if ($("#elementid").length) {
    //it does!
}

//Cancel an ajax request
var req = $.ajax({
type:     "POST",
url:     "someurl",
data:     "id=1",
success: function(){
//something
}
});
//Cancel the Ajax Request
req.abort()

// Toggle all checkboxes
var tog = false; // or true if they are checked on load
$('a').click(function() {
    $("input[type=checkbox]").attr("checked",!tog);
    tog = !tog;
});

// Validate date of birth
$("#lda-form").submit(function(){
    var day = $("#day").val();
    var month = $("#month").val();
    var year = $("#year").val();
    var age = 18;
    var mydate = new Date();
    mydate.setFullYear(year, month-1, day);

    var currdate = new Date();
    currdate.setFullYear(currdate.getFullYear() - age);
    if ((currdate - mydate) < 0){
        alert("Sorry, only persons over the age of " + age + " may enter this site");
        return false;
    }
    return true;
});

// Center an element on the screen
jQuery.fn.center = function () {
    this.css("position","absolute");
    this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
    this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
    return this;
}

// Use the above function as:
$(element).center();


//Select all checkboxes
$(document).ready(function(){
    $("#checkboxall").change(function(){
        var checked_status = this.checked;
        $("input[name=checkall]").attr("checked", checked_status);
    });

});

// Get the current URL
$(document).ready(function() {
    var pathname = window.location.pathname;
});

// Check if and which key was pressed
$(function() {
    $(document).keypress(function(e){
        switch(e.which){
        // "ENTER"
        case 13:
        alert('enter pressed');
        break;

        // "s"
        case 115:
        alert('s pressed');
        break;

        (...)

        }
    });

});
        
// How to hide all children div except a specific one with jQuery?
$('#target div:not(#exclude)').hide();
//or
$('#target').children().filter(':not(#exclude)').hide(); 
 
 // Get IP address
 $.getJSON("http://jsonip.appspot.com?callback=?",function(data){
    alert( "Your ip: " + data.ip);
     
// Count number of textarea lines
var text = $("#textareaId").val();
var lines = text.split(/\r|\r\n|\n/);
alert(lines.length);    
});       

//Validate Credit Card
function isCreditCard( CC ){
    if (CC.length > 19)
        return (false);

    sum = 0; mul = 1; l = CC.length;
    for (i = 0; i < l; i++){
        digit = CC.substring(l-i-1,l-i);
        tproduct = parseInt(digit ,10)*mul;
        if (tproduct >= 10)
            sum += (tproduct % 10) + 1;
        else
            sum += tproduct;
        if (mul == 1)
            mul++;
        else
            mul–;
    }
    if ((sum % 10) == 0)
        return (true);
    else
        return (false);
}   
        
// Distinguish left and right mouse click
$("#element").live('click', function(e) {
    if( (!$.browser.msie && e.button == 0) || ($.browser.msie && e.button == 1) ) {
        alert("Left Button");
    }
    else if(e.button == 2)
        alert("Right Button");
});
        
// How to get the native image size
var img = $('#imageid');
var theImage = new Image();
theImage.src = img.attr("src");
alert("Width: " + theImage.width);
alert("Height: " + theImage.height);