25大实用的jQuery技巧和解决方案

1. 去除页面的右键菜单

$(document).ready(function(){

$(document).bind("contextmenu",function(e){

return false;

});

});

2、搜索输入框文字的消失

当鼠标获得焦点、失去焦点的时候，input输入框文字处理：

$(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、新窗口打开页面

$(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

<a href="http://www.opensourcehunter.com" rel="external">open link</a>

4、判断浏览器类型

注意： jQuery 1.4中$.support 来代替以前的$.browser

$(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、预加载图片

$(document).ready(function() {

jQuery.preloadImages = function()

{

for(var i = 0; i<arguments.length; i++)="" {="" jquery("=""><img>").attr("src", arguments[i]);

}

}

// how to use

$.preloadImages("image1.jpg");

});

</arguments.length;>

6、轻松切换css样式

$(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

<link rel="stylesheet" href="default.css" type="text/css">

// the links

<a href="#" class="Styleswitcher" rel="default.css">Default Theme</a>

<a href="#" class="Styleswitcher" rel="red.css">Red Theme</a>

<a href="#" class="Styleswitcher" rel="blue.css">Blue Theme</a>

});

7、高度相等的列

如果您使用两个CSS列，以此来作为他们完全一样的高度

$(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、简单字体变大缩小

$(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、返回头部滑动动画

$('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>

10、获取鼠标位置

$().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);

});

11、判断一个元素是否为空

if ($('#id').html()) {

// do something

}

12、替换元素

$('#id').replaceWith('

<div>I have been replaced</div>

');

13、jquery timer 返回函数

$(document).ready(function() {

window.setTimeout(function() {

// do something

}, 1000);

});

14、jquery也玩替换

$(document).ready(function() {

var el = $('#id');

el.html(el.html().replace(/word/ig, ""));

});

15、判断元素是否存在

$(document).ready(function() {

if ($('#id').length) {

// do something

}

});

16、让div也可以click

$("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

<div><a href="index.html">home</a></div>

17、使用jquery来判断浏览器大小添加不同的class

$(document).ready(function() {

function checkWindowSize() {

if ( $(window).width() > 1200 ) {

$('body').addClass('large');

}

else {

$('body').removeClass('large');

}

}

$(window).resize(checkWindowSize);

});

18、几个字符就clone！

var cloned = $('#id').clone()

19、设置div在屏幕中央

$(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();

});

20、创建自己的选择器

$(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');

});

});

21、计算元素的数目

$(document).ready(function() {

$("p").size();

});

22、设置自己的li样式

$(document).ready(function() {

$("ul").addClass("Replaced");

$("ul > li").prepend("‒ ");

// how to use

ul.Replaced { list-style : none; }

});

23、使用google的主机来加载jquery库

<script src="http://www.google.com/jsapi"></script>

<script type="text/javascript">

google.load("jquery", "1.2.6");

google.setOnLoadCallback(function() {

// do something

});

</script><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type="text/javascript"></script>

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

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>

24、关闭jquery动画效果

$(document).ready(function() {

jQuery.fx.off = true;

});

25、使用自己的jquery标识

$(document).ready(function() {

var $jq = jQuery.noConflict();

$jq('#id').show();

});