8 practical jQuery tips_jquery-JS Tutorial-php.cn

8 practical jQuery tips_jquery

WBOY

Release： 2016-05-16 16:57:26

Original

1062 people have browsed it

1) Disable the right-click function
If you want to protect website information for users, then developers can use this code - disable the right-click function.

Copy code The code is as follows:

$(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) Use jQuery to set the text size
Using this code, the user can resize the text (increase or decrease) according to their needs.

Copy code The code is as follows:

$(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 the link in a new window
Using this code will help users open the link in a new window and provide users with better User experience.

Copy code The code is as follows:

$(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) Change the style list
Use this code to help you change the style list.

Copy code The code is as follows:

$(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) Return to top link
This code is for It is very practical to click on a single page for a long time, and you can click the "return to top" function at important moments.

Copy code The code is as follows:

$(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 the X/Y axis of the mouse pointer

Copy code The code is as follows:

$().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 the current mouse Coordinates
Using this script you can get mouse coordinates in any web browser.

Copy code The code is as follows:

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

8) Image preloading
This code helps users quickly load images or web pages.

Copy code The code is as follows:

jQuery.preloadImagesInWebPage = function() 
{
 for(var ctr = 0; 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…');
});