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
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$(document).ready( function (){ |
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$(document).bind( "contextmenu" , function (e){ |
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return false ; |
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}); |
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}); |
2、 隐藏搜索文本框文字
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$(document).ready( function () { |
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$( "input.text1" ).val( "Enter your search text here" ); |
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textFill($( 'input.text1' )); |
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}); |
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function textFill(input){ //input focus text function |
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var originalvalue = input.val(); |
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input.focus( function (){ |
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if ( $.trim(input.val()) == originalvalue ){ input.val( '' ); } |
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}); |
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input.blur( function (){ |
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if ( $.trim(input.val()) == '' ){ input.val(originalvalue); } |
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}); |
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} |
3、 在 新窗口中打开链接
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$(document).ready( function () { |
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//Example 1: Every link will open in a new window |
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$( 'a[href^="<a href="http://%22]%27%29.attr%28%22target/">http://"]' ).attr( "target</a>" , "_blank" ); |
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//Example 2: Links with the rel="external" attribute will only open in a new window |
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$( 'a[@rel$=' external ']' ).click( function (){ |
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this .target = "_blank" ; |
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}); |
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}); |
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// how to use |
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<A href= "<a href=" http: //www.opensourcehunter.com/">http://www.opensourcehunter.com</a>" rel=external>open link</A> |
4、检测浏览器注: 在版本jQuery 1.4中,$.support 替换掉了$.browser 变量。
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$(document).ready( function () { |
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// Target Firefox 2 and above |
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if ($.browser.mozilla && $.browser.version >= "1.8" ){ |
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// do something |
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} |
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// Target Safari |
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if ( $.browser.safari ){ |
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// do something |
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} |
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// Target Chrome |
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if ( $.browser.chrome){ |
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// do something |
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} |
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// Target Camino |
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if ( $.browser.camino){ |
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// do something |
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} |
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// Target Opera |
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if ( $.browser.opera){ |
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// do something |
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} |
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// Target IE6 and below |
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if ($.browser.msie && $.browser.version <= 6 ){ |
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// do something |
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} |
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// Target anything above IE6 |
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if ($.browser.msie && $.browser.version > 6){ |
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// do something |
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} |
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}); |
5、预加载图片
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$(document).ready( function () { |
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jQuery.preloadImages = function () |
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{ |
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for ( var i = 0; i ").attr(" src", arguments[i]); |
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} |
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}; |
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// how to use |
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$.preloadImages( "image1.jpg" ); |
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}); |
6、页面样式切换
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$(document).ready( function () { |
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$( "a.Styleswitcher" ).click( function () { |
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//swicth the LINK REL attribute with the value in A REL attribute |
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$( 'link[rel=stylesheet]' ).attr( 'href' , $( this ).attr( 'rel' )); |
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}); |
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// how to use |
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// place this in your header |
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<LINK href= "default.css" type=text/css rel=stylesheet> |
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// the links |
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<A class=Styleswitcher href= "#" rel= default .css>Default Theme</A> |
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<A href= "#" rel=red.css>Red Theme</A> |
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<A href= "#" rel=blue.css>Blue Theme</A> |
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}); |
7、 列高度相同如果使用了两个CSS列,使用此种方式可以是两列的高度相同。
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$(document).ready( function () { |
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function equalHeight(group) { |
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tallest = 0; |
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group.each( function () { |
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thisHeight = $( this ).height(); |
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if (thisHeight > tallest) { |
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tallest = thisHeight; |
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} |
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}); |
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group.height(tallest); |
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} |
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// how to use |
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$(document).ready( function () { |
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equalHeight($( ".left" )); |
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equalHeight($( ".right" )); |
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}); |
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}); |
8、 动态控制 页面字体大小用户可以改变页面字体大小
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$(document).ready( function () { |
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// Reset the font size(back to default) |
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var originalFontSize = $( 'html' ).css( 'font-size' ); |
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$( ".resetFont" ).click( function (){ |
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$( 'html' ).css( 'font-size' , originalFontSize); |
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}); |
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// Increase the font size(bigger font0 |
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$( ".increaseFont" ).click( function (){ |
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var currentFontSize = $( 'html' ).css( 'font-size' ); |
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var currentFontSizeNum = parseFloat(currentFontSize, 10); |
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var newFontSize = currentFontSizeNum*1.2; |
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$( 'html' ).css( 'font-size' , newFontSize); |
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return false ; |
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}); |
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// Decrease the font size(smaller font) |
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$( ".decreaseFont" ).click( function (){ |
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var currentFontSize = $( 'html' ).css( 'font-size' ); |
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var currentFontSizeNum = parseFloat(currentFontSize, 10); |
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var newFontSize = currentFontSizeNum*0.8; |
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$( 'html' ).css( 'font-size' , newFontSize); |
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return false ; |
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}); |
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}); |
9、返回页面顶部功能
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$(document).ready( function () { |
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$( 'a[href*=#]' ).click( function () { |
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if (location.pathname.replace(/^/ //,'') == this.pathname.replace(/^///,'') |
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&& location.hostname == this .hostname) { |
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var $target = $( this .hash); |
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$target = $target.length && $target |
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|| $( '[name=' + this .hash.slice(1) + ']' ); |
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if ($target.length) { |
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var targetOffset = $target.offset().top; |
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$( 'html,body' ) |
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.animate({scrollTop: targetOffset}, 900); |
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return false ; |
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} |
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} |
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}); |
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// how to use |
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// place this where you want to scroll to |
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<A name=top></A> |
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// the link |
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<A href= "#top" >go to top</A> |
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}); |
10、获得鼠标指针 XY值
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$(document).ready( function () { |
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$().mousemove( function (e){ |
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//display the x and y axis values inside the div with the id XY |
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$( '#XY' ).html( "X Axis : " + e.pageX + " | Y Axis " + e.pageY); |
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}); |
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// how to use |
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<DIV id=XY></DIV> |
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}); |
11、 验证元素是否为空
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$(document).ready( function () { |
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if ($( '#id' ).html()) { |
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// do something |
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} |
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}); |
12、替换元素
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$(document).ready( function () { |
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$( '#id' ).replaceWith(' |
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<DIV>I have been replaced</DIV> |
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'); |
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}); |
13、jQuery延时加载功能
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$(document).ready( function () { |
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window.setTimeout( function () { |
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// do something |
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}, 1000); |
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}); |
14、 移除单词功能
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$(document).ready( function () { |
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var el = $( '#id' ); |
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el.html(el.html().replace(/word/ig, "" )); |
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}); |
16、验证元素是否存在于Jquery对象集合中
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$(document).ready( function () { |
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if ($( '#id' ).length) { |
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// do something |
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} |
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}); |
17、使整个DIV可点击
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$(document).ready( function () { |
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$( "div" ).click( function (){ |
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//get the url from href attribute and launch the url |
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window.location=$( this ).find( "a" ).attr( "href" ); return false ; |
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}); |
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// how to use |
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<DIV><A href= "index.html" >home</A></DIV> |
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}); |
18、ID与 Class之间转换当改变Window大小时,在ID与Class之间切换
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$(document).ready( function () { |
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function checkWindowSize() { |
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if ( $(window).width() > 1200 ) { |
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$( 'body' ).addClass( 'large' ); |
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} |
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else { |
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$( 'body' ).removeClass( 'large' ); |
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} |
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} |
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$(window).resize(checkWindowSize); |
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}); |
19、 克隆对象
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$(document).ready( function () { |
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var cloned = $( '#id' ).clone(); |
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// how to use |
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<DIV id=id></DIV> |
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}); |
20、使元素居屏幕中间位置
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$(document).ready( function () { |
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jQuery.fn.center = function () { |
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this .css( "position" , "absolute" ); |
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this .css( "top" , ( $(window).height() - this .height() ) / 2+$(window).scrollTop() + "px" ); |
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this .css( "left" , ( $(window).width() - this .width() ) / 2+$(window).scrollLeft() + "px" ); |
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return this ; |
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} |
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$( "#id" ).center(); |
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}); |
21、写自己的选择器
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$(document).ready( function () { |
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$.extend($.expr[ ':' ], { |
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moreThen1000px: function (a) { |
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return $(a).width() > 1000; |
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} |
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}); |
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$( '.box:moreThen1000px' ).click( function () { |
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// creating a simple js alert box |
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alert( 'The element that you have clicked is over 1000 pixels wide' ); |
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}); |
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}); |
22、统计元素个数
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$(document).ready( function () { |
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$( "p" ).size(); |
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}); |
23、使用自己的 Bullets
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$(document).ready( function () { |
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$( "ul" ).addClass( "Replaced" ); |
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$( "ul > li" ).prepend( "‒ " ); |
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// how to use |
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ul.Replaced { list-style : none; } |
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}); |
24、引用Google主机上的Jquery类库Let Google host the jQuery script for you. This can be done in 2 ways.
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//Example 1 |
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<SCRIPT src= "<a href=" http: //www.google.com/jsapi%22%3E%3C/SCRIPT">http://www.google.com/jsapi"></SCRIPT</a>> |
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<SCRIPT type=text/javascript> |
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google.load( "jquery" , "1.2.6" ); |
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google.setOnLoadCallback( function () { |
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// do something |
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}); |
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</SCRIPT><SCRIPT src= "<a href=" http: //ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js">http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js</a>" type=text/javascript></SCRIPT> |
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// Example 2:(the best and fastest way) |
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<SCRIPT src= "<a href=" http: //ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js">http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js</a>" type=text/javascript></SCRIPT> |
25、禁用Jquery(动画)效果
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$(document).ready( function () { |
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jQuery.fx.off = true ; |
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}); |
26、 与 其他Javascript类库冲突解决方案
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$(document).ready( function () { |
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var $jq = jQuery.noConflict(); |
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$jq( '#id' ).show(); |
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}); |