本文列出jquery一些应用小技巧,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、页面样式切换、所有列等高、动态控制页面字体大小、获得鼠标指针的X值Y值、验证元素是否为空、替换元
素、延迟加载、验证元素是否存在于Jquery集合中、使DIV可点击、克隆对象、使元素居中、计算元素个数、使用Google主机上的Jquery类
库、禁用Jquery效果、解决Jquery类库与其他Javascript类库冲突问题。
请看下文jquery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
$(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
$(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://huhaiqia.blog.163.com/blog/http://www.opensourcehunter.com" rel=external>open
link</A>
4、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 &&
$.browser.version <= 6
){
// do
something
}
// Target
anything above IE6
if ($.browser.msie
&& $.browser.version >
6){
// do
something
}
});
5、预加载图片
$(document).ready(function()
{
jQuery.preloadImages =
function()
{
for(var i = 0; i").attr("src",
arguments[i]);
}
};
// 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
<LINK
href="http://huhaiqia.blog.163.com/blog/default.css" type=text/css
rel=stylesheet>
//
the links
<A class=Styleswitcher
href="http://huhaiqia.blog.163.com/blog/#" rel=default.css>Default
Theme</A>
<A class=Styleswitcher
href="http://huhaiqia.blog.163.com/blog/#" rel=red.css>Red
Theme</A>
<A class=Styleswitcher
href="http://huhaiqia.blog.163.com/blog/#" rel=blue.css>Blue
Theme</A>
});
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
$(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
<A
name=top></A>
// the
link
<A
href="http://huhaiqia.blog.163.com/blog/#top">go to
top</A>
});
10、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
<DIV
id=XY></DIV>
});
11、验证元素是否为空
$(document).ready(function()
{
if
($(‘#id‘).html())
{
//
do
something
}
});
12、替换元素
$(document).ready(function()
{
$(‘#id‘).replaceWith(‘
<DIV>I have been
replaced</DIV>
‘);
});
13、jQuery延时加载功能
$(document).ready(function()
{
window.setTimeout(function()
{
// do
something
}, 1000);
});
14、 移除单词功能
$(document).ready(function()
{
var el =
$(‘#id‘);
el.html(el.html().replace(/word/ig,
""));
});
15、验证元素是否存在于Jquery对象集合中
$(document).ready(function()
{
if
($(‘#id‘).length)
{
// do
something
}
});
16、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
<DIV><A
href="http://huhaiqia.blog.163.com/blog/index.html">home</A></DIV>
});
17、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);
});
18、克隆对象
$(document).ready(function()
{
var cloned =
$(‘#id‘).clone();
//
how to use
<DIV
id=id></DIV>
});
18、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();
});
19、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‘);
});
});
20、统计元素个数
$(document).ready(function()
{
$("p").size();
});
21、使用自己的 Bullets
$(document).ready(function()
{
$("ul").addClass("Replaced");
$("ul > li").prepend("?
");
// how to
use
ul.Replaced
{ list-style : none; }
});
22、引用Google主机上的Jquery类库Let Google host the jQuery script for you.
This can be done in 2 ways.
//Example 1
<SCRIPT
src="http://huhaiqia.blog.163.com/blog/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://huhaiqia.blog.163.com/blog/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 src="http://huhaiqia.blog.163.com/blog/http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"
type=text/javascript></SCRIPT>
23、禁用Jquery(动画)效果
$(document).ready(function()
{
jQuery.fx.off = true;
});
24、 与其他Javascript类库冲突解决方案
$(document).ready(function()
{
var $jq =
jQuery.noConflict();
$jq(‘#id‘).show();
});