26JQUERY-SKILLS

Posted on | 四月 3, 2010 | 20 Comments

1. Disable right-click
Disable right-click contextual menu.

$(document).ready(function(){
$(document).bind(“contextmenu”,function(e){
return false;
});
});
$(document).ready(function(){
$(document).bind(“contextmenu”,function(e){
return false;
});
});

2. Disappearing search field text
Hide when clicked in the search field, the value.(example can be found below in the comment fields)

$(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); }
});
}
$(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); }
});
}

3. Opening links in a new window
XHTML 1.0 Strict doesn’t allow this attribute in the code, so use this to keep the code valid.

$(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”;
});
});
// how to use
open link
$(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”;
});
});
// how to use
open link

4. Detect browser
Change/add something for a certain browser.

Notice: As of jQuery 1.4, the $.browser variable is replaced by $.support.

$(document).ready(function() {
// Target Firefox 2 and above
if ($.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
}
});
$(document).ready(function() {
// Target Firefox 2 and above
if ($.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
}
});

5. Preloading images
This piece of code will prevent the loading of all images, which can be useful if you have a site with lots of images.

$(document).ready(function() {
jQuery.preloadImages = function()
{
for(var i = 0; i”).attr(“src”, arguments[i]);
}
}
// how to use
$.preloadImages(“image1.jpg”);
});
$(document).ready(function() {
jQuery.preloadImages = function()
{
for(var i = 0; i”).attr(“src”, arguments[i]);
}
}
// how to use
$.preloadImages(“image1.jpg”);
});

6. CSS Styleswitcher
Switch between different styles?

$(document).ready(function() {
$(“a.Styleswitcher”).click(function() {
//swicth the LINK REL attribute with the value in A REL attribute
$(‘link[rel=stylesheet]‘).attr(‘href’ , $(this).attr(‘rel’));
});
// how to use
// place this in your header

// the links
Default Theme
Red Theme
Blue Theme
});
$(document).ready(function() {
$(“a.Styleswitcher”).click(function() {
//swicth the LINK REL attribute with the value in A REL attribute
$(‘link[rel=stylesheet]‘).attr(‘href’ , $(this).attr(‘rel’));
});
// how to use
// place this in your header

// the links
Default Theme
Red Theme
Blue Theme
});

7. Columns of equal height
If you are using two CSS columns, use this to make them exactly the same 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”));
});
});
$(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”));
});
});

8. Font resizing
Want to let the users change there font size?

$(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;
});
});
$(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;
});
});

9. Smooth(animated) page scroll
For a smooth(animated) ride back to the top(or any location).

$(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

// the link
go to top
});
$(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

// the link
go to top
});

11. Get the mouse cursor x and y axis
Want to know where your mouse cursor is?

$(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);
});
// how to use

});
$(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);
});
// how to use

});

12. Verify if an Element is empty
This will allow you to check if an element is empty.

$(document).ready(function() {
if ($(‘#id’).html()) {
// do something
}
});
$(document).ready(function() {
if ($(‘#id’).html()) {
// do something
}
});

13. Replace a element
Want to replace a div, or something else?

$(document).ready(function() {
$(‘#id’).replaceWith(‘

‘);
});
$(document).ready(function() {
$(‘#id’).replaceWith(‘
I have been replaced

‘);
});

14. jQuery timer callback functions
Want to delay something?

$(document).ready(function() {
window.setTimeout(function() {
// do something
}, 1000);
});
$(document).ready(function() {
window.setTimeout(function() {
// do something
}, 1000);
});

15. Remove a word
Want to remove a certain word(s)?

$(document).ready(function() {
var el = $(‘#id’);
el.html(el.html().replace(/word/ig, “”));
});
$(document).ready(function() {
var el = $(‘#id’);
el.html(el.html().replace(/word/ig, “”));
});

16. Verify that an element exists in jQuery
Simply test with the .length property if the element exists.

$(document).ready(function() {
if ($(‘#id’).length) {
// do something
}
});
$(document).ready(function() {
if ($(‘#id’).length) {
// do something
}
});

17. Make the entire DIV clickable
Want to make the complete 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;
});
// how to use

});
$(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;
});
// how to use
home

});

18. Switch between classes or id’s when resizing the window.
Want to switch between a class or id, when resizing the window?

$(document).ready(function() {
function checkWindowSize() {
if ( $(window).width() > 1200 ) {
$(‘body’).addClass(‘large’);
}
else {
$(‘body’).removeClass(‘large’);
}
}
$(window).resize(checkWindowSize);
});
$(document).ready(function() {
function checkWindowSize() {
if ( $(window).width() > 1200 ) {
$(‘body’).addClass(‘large’);
}
else {
$(‘body’).removeClass(‘large’);
}
}
$(window).resize(checkWindowSize);
});

19. Clone a object
Clone a div or an other element.

$(document).ready(function() {
var cloned = $(‘#id’).clone();
// how to use

});
$(document).ready(function() {
var cloned = $(‘#id’).clone();
// how to use

});

20. Center an element on the screen
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;
}
$(“#id”).center();
});
$(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;
}
$(“#id”).center();
});

21. Write our own selector
Write your own selectors.

$(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’);
});
});
$(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’);
});
});

22. Count a element
Count an element.

$(document).ready(function() {
$(“p”).size();
});
$(document).ready(function() {
$(“p”).size();
});

23. Use Your Own Bullets
Want to use your own bullets instead of using the standard or images bullets?

$(document).ready(function() {
$(“ul”).addClass(“Replaced”);
$(“ul > li”).prepend(“‒ “);
// how to use
ul.Replaced { list-style : none; }
});
$(document).ready(function() {
$(“ul”).addClass(“Replaced”);
$(“ul > li”).prepend(“‒ “);
// how to use
ul.Replaced { list-style : none; }
});

24. Let Google host jQuery for you
Let Google host the jQuery script for you. This can be done in 2 ways.

//Example 1

// Example 2:(the best and fastest way)

//Example 1

// Example 2:(the best and fastest way)

25. Disable jQuery animations
Disable all jQuery effects

$(document).ready(function() {
jQuery.fx.off = true;
});
$(document).ready(function() {
jQuery.fx.off = true;
});

26. No conflict-mode
To avoid conflict other libraries on your website, you can use this jQuery Method, and assign a different variable name instead of the dollar sign.

$(document).ready(function() {
var $jq = jQuery.noConflict();
$jq(‘#id’).show();
});
$(document).ready(function() {
var $jq = jQuery.noConflict();
$jq(‘#id’).show();
});

相关文章:

1. Prototype And jquery
2. 10 JQUERY 设计技巧
3. 禁止右键代码
4. jQuery方法大全
5. jquery自学笔记1

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