26个Jquery使用小技巧

长平狐 发布于 2012/09/06 16:45
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下面列出了一些Jquery使用技巧。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。

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://www.opensourcehunter.com" rel=external>open link</A>
 
4. 检测浏览器
 
$(document).ready( function () {
// Target Firefox 2 and above
if ($.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; jQuery(?<img { 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 rel=stylesheet type=text/css href= "default.css" >
// the links
<A class="Styleswitcher" href= "#" rel= default .css>Default Theme</A>
<A class="Styleswitcher" href= "#" rel=red.css>Red Theme</A>
<A class="Styleswitcher" href= "#" rel=blue.css>Blue Theme</A>
});
 
7. 列高度相同
$(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
$(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= "#top" >go to top</A>
});
 
11. 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>
 
});
 
12. 验证元素是否为空
 
$(document).ready( function () {
if ($( '#id' ).html()) {
// do something
}
});
 
13. 替换元素
 
$(document).ready( function () {
$( '#id' ).replaceWith( '
<DIV>I have been replaced</DIV>
 
' );
});
 
14. jQuery延时加载功能
 
$(document).ready( function () {
window.setTimeout( function () {
// do something
}, 1000);
});
 
15. 移除单词功能
 
$(document).ready( function () {
var el = $( '#id' );
el.html(el.html().replace(/word/ig, "" ));
});
 
16. 验证元素是否存在于jquery对象集合中
 
$(document).ready( function () {
if ($( '#id' ).length) {
// do something
}
});
 
17. 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= "index.html" >home</A></DIV>
 
});
 
18. ID与Class之间转换.
 
$(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= "index.html" >home</A></DIV>
 
});
 
19. 克隆对象
 
$(document).ready( function () {
var cloned = $( '#id' ).clone();
// how to use
<DIV id=id></DIV>
 
});
 
20. 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();
});
 
21. 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' );
});
});
 
22. 统计元素个数
 
$(document).ready( function () {
$( "p" ).size();
});
 
23. 使用自己的 Bullets
 
$(document).ready( function () {
$( "ul" ).addClass( "Replaced" );
$( "ul > li" ).prepend( "‒ " );
// how to use
ul.Replaced { list-style : none; }
});
 
24. 引用Google主机上的Jquery类库
 
<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 type=text/javascript src= "http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" ></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>
 
25. 禁用Jquery(动画)效果
 
$(document).ready( function () {
jQuery.fx.off = true ;
});
 
26. 与其他Javascript类库冲突解决方案
 
 
$(document).ready( function () {
var $jq = jQuery.noConflict();
$jq( '#id' ).show();
});

原文链接:http://www.cnblogs.com/weisenz/archive/2012/09/05/2672176.html
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