Jquery常用技巧收集整理篇_jquery

比如有禁止右键点击、隐藏搜索文本框文字、在新窗口中打开链接、检测浏览器、预加载图片等等。具体如下：
禁止右键点击

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

隐藏搜索文本框文字

$(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); }
});
}

在新窗口中打开链接

$(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

检测浏览器
注: 在版本jQuery 1.4中，$.support 替换掉了$.browser 变量。

$(document).ready(function() {
// Target Firefox 2 and above
if ($.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 && $.browser.version // do something
}
// Target anything above IE6
if ($.browser.msie && $.browser.version > 6){
// do something
}
});

预加载图片

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

页面样式切换

$(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
});

列高度相同
如果使用了两个CSS列，使用此种方式可以是两列的高度相同。

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

动态控制页面字体大小

$(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;
});
});

返回页面顶部功能

$(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
});

获得鼠标指针XY值

$(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

});

验证元素是否为空

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

替换元素

$(document).ready(function() {
$('#id').replaceWith('

I have been replaced

);
});

jQuery延时加载功能

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

移除单词功能

$(document).ready(function() {
var el = $('#id');
el.html(el.html().replace(/word/ig, ""));
});

验证元素是否存在于jQuery对象集合中

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

使整个DIV可点击

$(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

});

ID与Class之间转换当改变Window大小时，在ID与Class之间切换

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

克隆对象

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

});

使元素居屏幕中间位置

$(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();
});

写自己的选择器

$(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');
});
});

统计元素个数

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

使用自己的Bullets

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

引用Google主机上的jQuery类库

//Example 1


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

禁用jQuery（动画）效果

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

与其他JavaScript类库冲突解决方案

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