下面列出了一些Jquery使用技巧。比如有禁止右鍵點擊、隱藏搜索文本框文字、在新窗口中打開鏈接、檢測瀏覽器、預加載圖片、頁面樣式切換、所有列等高、動態控制頁面字體大小、獲得鼠標指針的X值Y值、驗證元素是否爲空、替換元素、延遲加載、驗證元素是否存在於Jquery集合中、使DIV可點擊、克隆對象、使元素居中、計算元素個數、使用Google主機上的Jquery類庫、禁用Jquery效果、解決Jquery類庫與其他Javascript類庫衝突問題。
1. 禁止右鍵點擊
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$(document).ready( function (){ $(document).bind( "contextmenu" , function (e){ return
false ; }); }); |
2. 隱藏搜索文本框文字
Hide when clicked in the search field, the value.(example can be found below in the comment fields)
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$(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 (
$.trim(input.val()) == ''
){ input.val(originalvalue); } }); } |
3. 在新窗口中打開鏈接
XHTML 1.0 Strict doesn’t allow this attribute in the code, so use this to keep the code valid.
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$(document).ready( function ()
{ //Example
1: Every link will <span id="8_nwp" style="width: auto; height: auto; float: none;"><a id="8_nwl" href="http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=open&k0=open&kdi0=0&luki=2&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0"
target="_blank" mpid="8" style="text-decoration: none;"><span style="color:#0000ff;font-size:14px;width:auto;height:auto;float:none;">open</span></a></span> in a new window $( 'a[href^="http://"]' ).attr( "<span
id=" 9_nwp "
style=" width:
auto; height: auto; float: none; "><a
id=" 9_nwl "
href=" http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=target&k0=target&kdi0=0&luki=5&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0 "
target=" _blank "
mpid=" 9 "
style=" text-decoration:
none; "><span
style=" color: #0000ff;font-size:14px;width:auto;height:auto;float:none;">target</span></a></span>",
"_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 |
4. 檢測瀏覽器
注: 在版本jQuery 1.4中,$.support 替換掉了$.browser 變量
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$(document).ready( function ()
{ //
Target Firefox 2 and above if
($.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 && $.browser.version > 6){ //
do something } }); |
5. 預加載圖片
This piece of code will prevent the loading of all images, which can be useful if you have a site with lots of images.
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$(document).ready( function ()
{ jQuery.preloadImages
= function () { for ( var
i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)> ").attr(" src ",
arguments[i]); } } //
how to use $.preloadImages(" image1.jpg"); }); |
6. 頁面樣式切換
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$(document).ready( function ()
{ $( "a.Styleswitcher" ).click( function ()
{ //swicth
the LINK REL attribute with the value in A REL attribute $( 'link[rel=stylesheet]' ).attr( 'href'
, $( this ).attr( 'rel' )); }); //
how to use //
place this in your header <LINK
rel=stylesheet type=text/<span id= "7_nwp"
style= "width:
auto; height: auto; float: none;" ><a
id= "7_nwl"
href= "http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=css&k0=css&kdi0=0&luki=4&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0"
target= "_blank"
mpid= "7"
style= "text-decoration:
none;" ><span
style= "color:#0000ff;font-size:14px;width:auto;height:auto;float:none;" >css</span></a></span>
href= "default.css" > //
the links <A
class=Styleswitcher href= "#"
rel= default .css>Default
Theme</A> <A
class=Styleswitcher href= "#"
rel=red.css>Red Theme</A> <A
class=Styleswitcher href= "#"
rel=blue.css>Blue Theme</A> }); |
7. 列高度相同
如果使用了兩個CSS列,使用此種方式可以是兩列的高度相同。
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$(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($( ".right" )); }); }); |
8. 動態控制頁面字體大小
用戶可以改變頁面字體大小
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$(document).ready( function ()
{ //
Reset the font size(back to default) var
originalFontSize = $( 'html' ).<span
id= "5_nwp"
style= "width:
auto; height: auto; float: none;" ><a
id= "5_nwl"
href= "http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=css&k0=css&kdi0=0&luki=4&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0"
target= "_blank"
mpid= "5"
style= "text-decoration:
none;" ><span
style= "color:#0000ff;font-size:14px;width:auto;height:auto;float:none;" >css</span></a></span>( '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' ).<span
id= "6_nwp"
style= "width:
auto; height: auto; float: none;" ><a
id= "6_nwl"
href= "http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=css&k0=css&kdi0=0&luki=4&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0"
target= "_blank"
mpid= "6"
style= "text-decoration:
none;" ><span
style= "color:#0000ff;font-size:14px;width:auto;height:auto;float:none;" >css</span></a></span>( 'font-size' ); var
currentFontSizeNum = parseFloat(currentFontSize, 10); var
newFontSize = currentFontSizeNum*0.8; $( 'html' ).css( 'font-size' ,
newFontSize); return
false ; }); }); |
9. 返回頁面頂部功能
For a smooth(animated) ride back to the top(or any location).
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$(document).ready( function ()
{ $( 'a[href*=#]' ).click( function ()
{ if
(location.pathname.replace(/^\ //,'')
== this.pathname.replace(/^\//,'') &&
location.hostname == this .hostname)
{ var
$<span id= "4_nwp"
style= "width:
auto; height: auto; float: none;" ><a
id= "4_nwl"
href= "http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=target&k0=target&kdi0=0&luki=5&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0"
target= "_blank"
mpid= "4"
style= "text-decoration:
none;" ><span
style= "color:#0000ff;font-size:14px;width:auto;height:auto;float:none;" >target</span></a></span>
= $( this .hash); $target
= $target.length && $target ||
$( '[name='
+ this .hash.slice(1)
+ ']' ); if
($target.length) { var
targetOffset = $target.offset().top; $( 'html,body' ) .animate({scrollTop:
targetOffset}, 900); return
false ; } } }); //
how to use //
place this where you want to scroll to <A
name=top></A> //
the link <A
href= "#top" >go
to top</A> }); |
11. 獲得鼠標指針XY值
Want to know where your mouse cursor is?
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$(document).ready( function ()
{ $().mousemove( function (e){ //display
the x and y axis values inside the div with the id XY $( '#XY' ).html( "X
Axis : "
+ e.pageX + "
| Y Axis "
+ e.pageY); }); //
how to use <DIV
id=XY></DIV> }); |
12. 驗證元素是否爲空
This will allow you to check if an element is empty.
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$(document).ready( function ()
{ if
($( '#id' ).html())
{ //
do something } }); |
13. 替換元素
Want to replace a div, or something else?
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$(document).ready( function ()
{ $( '#id' ).replaceWith( ' <DIV>I
have been replaced</DIV> ' ); }); |
14. jQuery延時加載功能
Want to delay something?
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$(document).ready( function ()
{ window.setTimeout( function ()
{ //
do something },
1000); }); |
15. 移除單詞功能
Want to remove a certain word(s)?
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$(document).ready( function ()
{ var
el = $( '#id' ); el.html(el.html().replace(/word/ig,
"" )); }); |
16. 驗證元素是否存在於jquery對象集合中
Simply test with the .length property if the element exists.
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$(document).ready( function ()
{ if
($( '#id' ).length)
{ //
do something } }); |
17. 使整個DIV可點擊
Want to make the complete div clickable?
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$(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與Class之間轉換.
當改變Window大小時,在ID與Class之間切換
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$(document).ready( function ()
{ function
checkWindowSize() { if
( $(window).width() > 1200 ) { $( 'body' ).addClass( 'large' ); } else
{ $( 'body' ).removeClass( 'large' ); } } $(window).resize(checkWindowSize); }); |
19. 克隆對象
Clone a div or an other element.
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$(document).ready( function ()
{ var
cloned = $( '#id' ).clone(); //
how to use <DIV
id=id></DIV> }); |
20. 使元素居屏幕中間位置
Center an element in the center of your screen.
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$(document).ready( function ()
{ jQuery.fn.center
= function
() { this .<span
id= "3_nwp"
style= "width:
auto; height: auto; float: none;" ><a
id= "3_nwl"
href= "http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=css&k0=css&kdi0=0&luki=4&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0"
target= "_blank"
mpid= "3"
style= "text-decoration:
none;" ><span
style= "color:#0000ff;font-size:14px;width:auto;height:auto;float:none;" >css</span></a></span>( "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 ; } $( "#id" ).center(); }); |
21. 寫自己的選擇器
Write your own selectors.
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$(document).ready( function ()
{ $.extend($.expr[ ':' ],
{ moreThen1000px:
function (a)
{ return
$(a).width() > 1000; } }); $( '.box:moreThen1000px' ).click( function ()
{ //
creating a simple js alert box alert( 'The
element that you have clicked is over 1000 pixels wide' ); }); }); |
22. 統計元素個數
Count an element.
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$(document).ready( function ()
{ $( "p" ).size(); }); |
23. 使用自己的 Bullets
Want to use your own bullets instead of using the standard or images bullets?
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$(document).ready( function ()
{ $( "ul" ).addClass( "Replaced" ); $( "ul
> li" ).prepend( "‒
" ); //
how to use ul.Replaced
{ list-style : none; } }); |
24. 引用Google主機上的Jquery類庫
Let Google host the jQuery script for you. This can be done in 2 ways.
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//Example
1 <SCRIPT
type=text/<span id= "1_nwp"
style= "width:
auto; height: auto; float: none;" ><a
id= "1_nwl"
href= "http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=javascript&k0=javascript&kdi0=0&luki=6&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0"
target= "_blank"
mpid= "1"
style= "text-decoration:
none;" ><span
style= "color:#0000ff;font-size:14px;width:auto;height:auto;float:none;" >javascript</span></a></span>> google.load( "jquery" ,
"1.2.6" ); google.setOnLoadCallback( function ()
{ //
do something }); </SCRIPT><SCRIPT
type=text/javascript src= "http://<span
id=" 2_nwp "
style=" width:
auto; height: auto; float: none; "><a
id=" 2_nwl "
href=" http://cpro.baidu.com/cpro/ui/uijs.php?c=news&cf=1001&ch=0&di=128&fv=15&jk=efee86eb2bab058a&k=ajax&k0=ajax&kdi0=0&luki=3&n=10&p=baidu&q=06011078_cpr&rb=0&rs=1&seller_id=1&sid=8a05ab2beb86eeef&ssp2=1&stid=0&t=tpclicked3_hc&tu=u1922429&u=http%3A%2F%2Fwww%2Eadmin10000%2Ecom%2Fdocument%2F909%2Ehtml&urlid=0 "
target=" _blank "
mpid=" 2 "
style=" text-decoration:
none; "><span
style=" color: #0000ff;font-size:14px;width:auto;height:auto;float:none;">ajax</span></a></span>.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT> //
Example 2:(the best and fastest way) <SCRIPT
type=text/javascript src= "http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" ></SCRIPT> |
25. 禁用Jquery(動畫)效果
Disable all jQuery effects
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$(document).ready( function ()
{ jQuery.fx.off
= true ; }); |
26. 與其他Javascript類庫衝突解決方案
To avoid conflict other libraries on your website, you can use this jQuery Method, and assign a different variable name instead of the dollar sign.
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$(document).ready( function ()
{ var
$jq = jQuery.noConflict(); $jq( '#id' ).show(); }); |