7 Amazing jQuery Tricks

Once again, I’ve gathered some of the useful jQuery tips and tricks for you to see how great jQuery can be.

Here they are:

1. Preloading Images

With this trick you could preload images in JavaScript before using them.

jQuery.preloadImages = function()
{
 for(var i = 0; i ").attr("src", arguments[i]);
 }
};

// Usage
$.preloadImages("image1.gif", "/path/to/image2.png", "some/image3.jpg");

2. Target Blank Links

Avoid XHTML 1.0 to restrict your target=blank code. Use this jQuery trick to do such thing.

$('a[@rel$='external']').click(function(){
 this.target = "_blank";
});

/*
Usage:
lepinskidesign.com.br
*/

3. Get the total number of matched elements

$('element').size();

4. Detect Browser

CSS’ conditional comment is pretty useful to detect browser and apply some css style.

//A. Target Safari
if( $.browser.safari ) $("#menu li a").css("padding", "1em 1.2em" );

//B. Target anything above IE6
if ($.browser.msie && $.browser.version > 6 ) $("#menu li a").css("padding", "1em 1.8em" );

//C. Target IE6 and below
if ($.browser.msie && $.browser.version = "1.8" ) $("#menu li a").css("padding", "1em 1.8em" );

5. Columns of equal Height

Yes this is possible with the following jQuery trick.

function equalHeight(group) {
 tallest = 0;
 group.each(function() {
 thisHeight = $(this).height();
 if(thisHeight > tallest) {
 tallest = thisHeight;
 }
 });
 group.height(tallest);
}

/*
Usage:
$(document).ready(function() {
 equalHeight($(".recent-article"));
 equalHeight($(".footer-col"));
});
*/

6. Font Resize

Resize fonts using jQuery.

$(document).ready(function(){
 // Reset Font Size
 var originalFontSize = $('html').css('font-size');
 $(".resetFont").click(function(){
 $('html').css('font-size', originalFontSize);
 });
 // Increase Font Size
 $(".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 Font Size
 $(".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;
 });
});

7. Remove a word in a text

Remove any word in a text using this jQuery trick.

var el = $('#id');
el.html(el.html().replace(/word/ig, ""));