8 Useful jQuery Tips and Tricks for Programmers

Today we are going to share some tips and tricks for jQuery users. jQuery is one of the best  JavaScript libraries. It is designed for simplifying animations, event handling, Ajax-enabled and client side scripting of HTML. Also jQuery has various plugins for developers to help create websites and web pages in simple and easy ways.

Here are the 8 most useful jQuery tips and tricks for programmers.

1) Disable Right-Clicking

If you want to hide your site's information from users, developers should use this code to disable right-clicking. Using this code, jquery programmers can deactivate right-clicking on web pages. Here is the code:

$(document).ready(function() {
	//catch the right-click context menu
	$(document).bind("contextmenu",function(e) {				 
		//warning prompt - optional
		alert("No right-clicking!");

		//delete the default context menu
		return false;
	});
});

2) Text Resize with jQuery

Users can resize (increase and decrease) the text of websites with this code.

$(document).ready(function() {
	//find the current font size
	var originalFontSize = $('html').css('font-size');

	//Increase the text size
	$(".increaseFont").click(function() {
		var currentFontSize = $('html').css('font-size');
		var currentFontSizeNumber = parseFloat(currentFontSize, 10);

		var newFontSize = currentFontSizeNumber*1.2;
		$('html').css('font-size', newFontSize);
		return false;
	});

	//Decrease the Text 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;
	});

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

3) Open Links in New Windows

Try this code and increase your site impressions. Using this jQuery code users will go to a new window after clicking on a link on your site.

$(document).ready(function() {
	//select all anchor tags that have http in the href
	//and apply the target=_blank
	$("a[href^='http']").attr('target','_blank');
});

4) Style Sheets Swap

Swap style sheets using this code.

$(document).ready(function() {
	$("a.cssSwap").click(function() { 
		//swap the link rel attribute with the value in the rel    
		$('link[rel=stylesheet]').attr('href' , $(this).attr('rel')); 
	}); 
});

5) Back to Top Link

Back to top is a very common function on almost every website. This functionality is very useful for long pages.

$(document).ready(function() {
	//when the id="top" link is clicked
	$('#top').click(function() {
		//scoll the page back to the top
		$(document).scrollTo(0,500);
	}
});

6) Get Mouse Cursor x and y Axis

You can find the values of X and Y coordinates of mouse pointer with this code.

$().mousemove(function(e){
    //display the x and y axis values inside the P element
    $('p').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);
});

7) Detect Current Mouse Coordinates

Using this script, you can find the current mouse coordinates in any web browser that supports jQuery.

$(document).ready(function() {
$().mousemove(function(e)
{
$('# MouseCoordinates ').html("X Axis Position = " + e.pageX + " and Y Axis Position = " + e.pageY);
});

8) Preloading Images in jQuery

This image preloading script helps to quickly load images on your web pages.

jQuery.preloadImagesInWebPage = function() 
{
     for(var ctr = 0; ctr<arguments.length; ctr++)
{
jQuery("").attr("src", arguments[ctr]);
}
}
To use the above method, you can use the following piece of code:
$.preloadImages("image1.gif", "image2.gif", "image3.gif");
To check whether an image has been loaded, you can use the following piece of code:
$('#imageObject').attr('src', 'image1.gif').load(function() {
alert('The image has been loaded…');
});