35个jQuery小技巧

35个jquery小技巧。

1. 禁止右键点击

$(document).ready(function(){

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

return false;

});

});

2. 隐藏搜索文本框文字

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); }

});

}

3. 在新窗口中打开链接

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^="https://"]').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. 检测

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 <= 6 ){

// do something

}

// target anything above ie6

if ($.browser.msie && $.browser.version > 6){

// do something

}

});

5. 预加载图片

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);

}

}

// how to use

$.preloadimages("image1.jpg");

});

6. 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

});

7. 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"));

});

});

8. 动态控制页面字体大小

用户可以改变页面字体大小

$(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;

});

});

9. 返回页面顶部功能

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

});

10. 获得鼠标指针xy值

want to know where your mouse cursor is?

$(document).ready(function() {

$().mousemove(function(e){

//display the x and y axis values inside the p with the id xy

$('#xy').html("x axis : " + e.pagex + " | y axis " + e.pagey);

});

// how to use

});

11.返回顶部按钮

你可以利用 animate 和 scrolltop 来实现返回顶部的动画，而不需要使用其他插件。

// back to top

$('a.top').click(function () {

$(document.body).animate({scrolltop: 0}, 800);

return false;

});

back to top

改变 scrolltop 的值可以调整返回距离顶部的距离，而 animate 的第二个参数是执行返回动作需要的时间(单位：毫秒)。

12.预加载图片

如果你的页面中使用了很多不可见的图片(如：hover 显示)，你可能需要预加载它们：

$.preloadimages = function () {

for (var i = 0; i < arguments.length; i++) {

$('

').attr('src', arguments);
}

};

$.preloadimages('img/hover1.png', 'img/hover2.png');