Collection of snippets for jquery

jquery_snippets.js

//---- Center an element in the center of your screen.
$(document).ready(function() {
  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;
  }
});



//---- Clone a object
$(document).ready(function() {
   var cloned = $('#id').clone();
});



//---- Columns of equal height
$(document).ready(function() {
function equalHeight(group) {
    tallest = 0;
    group.each(function() {
        thisHeight = $(this).height();
        if(thisHeight > tallest) {
            tallest = thisHeight;
        }
    });
    group.height(tallest);
}



// how to use
$(document).ready(function() {
    equalHeight($(".left"));
    equalHeight($(".right"));
});
});



//---- Count an element
$(document).ready(function() {  
   $("p").size();  
});



//---- Count an element
$(document).ready(function() {
  // Target Firefox 2 and above
  if ($.browser.mozilla && $.browser.version >= "1.8" ){
	// do something
  }
  // Target Safari
  if( $.browser.safari ){
 	// do something
  }
  // Target Chrome
  if( $.browser.chrome){
	// do something
  }
  // Target Camino
  if( $.browser.camino){
	// do something
  }
  // Target Opera
  if( $.browser.opera){
	// do something
  }
  // Target IE6 and below
  if ($.browser.msie && $.browser.version <= 6 ){
	// do something
  }
  // Target anything above IE6
  if ($.browser.msie && $.browser.version > 6){
	// do something
  }
});



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



//---- Disappearing search field text
$(document).ready(function() {
  $("input.text1").val("Enter your search text here");
    textFill($('input.text1'));
  });
});

function textFill(input){ //input focus text function
  var originalvalue = input.val();
  input.focus( function(){
    if( $.trim(input.val()) == originalvalue ){ input.val(''); }
  });
  input.blur( function(){
    if( $.trim(input.val()) == '' ){ input.val(originalvalue); }
  });
}



//---- Font resizing
$(document).ready(function() {
  // Reset the font size(back to default)
  var originalFontSize = $('html').css('font-size');
    $(".resetFont").click(function(){
    $('html').css('font-size', originalFontSize);
  });
  // Increase the font size(bigger font0
  $(".increaseFont").click(function(){
    var currentFontSize = $('html').css('font-size');
    var currentFontSizeNum = parseFloat(currentFontSize, 10);
    var newFontSize = currentFontSizeNum*1.2;
    $('html').css('font-size', newFontSize);
    return false;
  });
  // Decrease the font size(smaller font)
  $(".decreaseFont").click(function(){
    var currentFontSize = $('html').css('font-size');
    var currentFontSizeNum = parseFloat(currentFontSize, 10);
    var newFontSize = currentFontSizeNum*0.8;
    $('html').css('font-size', newFontSize);
    return false;
  });
});



//---- Get the mouse cursor x and y axis
$(document).ready(function() {
   $().mousemove(function(e){
     //display the x and y axis values inside the div with the id XY
    $('#XY').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);
  });
});



//---- jQuery timer callback functions
$(document).ready(function() {
   window.setTimeout(function() {
     // do something
   }, 1000);
});



//---- Make the entire DIV clickable
$(document).ready(function() {
	$("div").click(function(){
	  //get the url from href attribute and launch the url
	  window.location=$(this).find("a").attr("href"); return false;
	});
});




//---- Opening links in a new window
$(document).ready(function() {
   //Example 1: Every link will open in a new window
   $('a[href^="http://"]').attr("target", "_blank");

   //Example 2: Links with the rel="external" attribute will only open in a new window
   $('a[@rel$='external']').click(function(){
      this.target = "_blank";
   });
});



//---- Remove a word
$(document).ready(function() {
   var el = $('#id');
   el.html(el.html().replace(/word/ig, ""));
});



//---- Replace an element
$(document).ready(function() {
   $('#id').replaceWith('<div>I have been replaced</div>');
});



//---- Smooth(animated) page scroll
$(document).ready(function() {
$('a[href*=#]').click(function() {
 if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
 && location.hostname == this.hostname) {
   var $target = $(this.hash);
   $target = $target.length && $target
   || $('[name=' + this.hash.slice(1) +']');
   if ($target.length) {
  	var targetOffset = $target.offset().top;
  	$('html,body').animate({scrollTop: targetOffset}, 900);
    	return false;
   }
  }
  });

// how to use
// place this where you want to scroll to
//<a name="top"></a>
// the link
//<a href="#top">go to top</a>
});



//---- Switch between classes or id’s when resizing the window.
$(document).ready(function() {
   function checkWindowSize() {
	if ( $(window).width() > 1200 ) {
		$('body').addClass('large');
	}
	else {
		$('body').removeClass('large');
	}
   }
$(window).resize(checkWindowSize);
});



//---- Use Your Own Bullets
$(document).ready(function() {  
   $("ul").addClass("Replaced");  
   $("ul > li").prepend("‒ ");  
});



//---- Verify if an Element is empty
$(document).ready(function() {
  if ($('#id').html()) {
   // do something
   }
});



//---- Verify that an element exists in jQuery
$(document).ready(function() {
   if ($('#id').length) {
  // do something
  }
});



//---- Write our own selector
$(document).ready(function() {
   $.extend($.expr[':'], {
       moreThen1000px: function(a) {
           return $(a).width() > 1000;
      }
   });
  $('.box:moreThen1000px').click(function() {
      // creating a simple js alert box
      alert('The element that you have clicked is over 1000 pixels wide');
  });
});



//---- Parse JSON
var obj = jQuery.parseJSON('
    {"name":"Larry King",
     "age": "5000"
    }');
alert( obj.name === "Larry King" ); //true
alert (obj.age  === "50");//false
alert (obj.age  === "5000"); //true



//---- How To Limit The Number Of Characters in a "Text-Area" field:
jQuery.fn.maxLength = function(max){
	this.each(function(){
		var type = this.tagName.toLowerCase();
		var inputType = this.type? this.type.toLowerCase() : null;
		if(type == "input" && inputType == "text" || inputType == "password"){
			//Apply the standard maxLength
			this.maxLength = max;
		}
		else if(type == "textarea"){
			this.onkeypress = function(e){
				var ob = e || event;
				var keyCode = ob.keyCode;
				var hasSelection = document.selection? document.selection.createRange().text.length > 0 : this.selectionStart != this.selectionEnd;
				return !(this.value.length >= max && (keyCode > 50 || keyCode == 32 || keyCode == 0 || keyCode == 13) && !ob.ctrlKey && !ob.altKey && !hasSelection);
			};
			this.onkeyup = function(){
				if(this.value.length > max){
					this.value = this.value.substring(0,max);
				}
			};
		}
	});
};

//Usage:
//$('#mytextarea').maxLength(500);




//--- How to test if an element is visible in jQuery
if($(element).is(':visible') == 'true') { //The element is Visible }




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



//---- How to Check if Cookies Are Enabled Or Not
var dt = new Date();
    dt.setSeconds(dt.getSeconds() + 60);
    document.cookie = "cookietest=1; expires=" + dt.toGMTString();
    var cookiesEnabled = document.cookie.indexOf("cookietest=") != -1;
    if(!cookiesEnabled)
	{
        //cookies have not been enabled
    }



//---- How to expire a Cookie
var date = new Date();
date.setTime(date.getTime() + (x * 60 * 1000));
$.cookie('example', 'foo', { expires: date });



//-- Retrieve url params with jquery
$.urlParam = function(name){
	var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(window.location.href);
	return results[1] || 0;
}

// example.com?someparam=name&otherparam=8&id=6
$.urlParam('someparam'); // name
$.urlParam('id');        // 6
$.urlParam('notavar');   // null