《锋利的jquery》源码整理——jquery技巧上
在看《锋利的jquery》这本书的时候,书末尾总结了jquery的一些用法技巧,感觉很实用,先收藏着以后用到,可以借鉴看看。
一,资源(在w3cfuns资源中可以找到第一版和第二版)
《锋利的jquery》: http://pan.baidu.com/share/link?shareid=1725756399&uk=4245516461 (PDF)
http://www.readfar.com/books/5520ce503063e1f304000696(ebup)
源码:http://pan.baidu.com/share/link?shareid=104027&uk=2030367496
二,代码
1,禁用页面的右键菜单
$(document).ready(function(){ $(document).bind("contextmenu",function(e){ return false; }); });
2,判断浏览器类型
$(document).ready(function() { // Firefox 2 and above if ($.browser.mozilla && $.browser.version >= "1.8" ){ // do something } // Safari if( $.browser.safari ){ // do something } // Chrome if( $.browser.chrome){ // do something } // Opera if( $.browser.opera){ // do something } // IE6 and below if ($.browser.msie && $.browser.version <= 6 ){ alert("ie6") } // anything above IE6 if ($.browser.msie && $.browser.version > 6){ alert("ie6以上") } });
3,输入框文字输入和失去焦点
<input type="text" class="text1" /> <script> $(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(‘‘); } }).blur( function(){ if( $.trim(input.val()) == ‘‘ ){ input.val(originalvalue); } }); } </script>
4.返回头部滑动动画
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> </head> <body> <div style="width:100%;height:800px;"></div> <a href="#nogo" id="goheader">返回顶部</a> <script> jQuery.fn.scrollTo = function(speed) { var targetOffset = $(this).offset().top; $(‘html,body‘).stop().animate({scrollTop: targetOffset}, speed); return this; }; // use $("#goheader").click(function(){ $("body").scrollTo(500); return false; }); </script> </body> </html>
5,获取鼠标位置
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> </head> <body> <div id="XY" ></div> <script> $(document).ready(function () { $(document).mousemove(function(e){ $(‘#XY‘).html("X : " + e.pageX + " | Y : " + e.pageY); }); }); </script> </body> </html>
6,判断元素是否存在
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> </head> <body> <div id="XY" ></div> <script> $(document).ready(function() { if ($(‘#XY‘).length){ alert(‘元素存在!‘) }else{ alert(‘元素不存在!‘) } }); </script> </body> </html>
7,点击div进行跳转
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> </head> <body> <div style="width:200px;height:40px;background:#eee;cursor:pointer;"> <a href="http://www.cssrain.cn">home</a> </div> <script> $(document).ready(function() { $("div").click(function(){ window.location=$(this).find("a").attr("href"); return false; }); }); </script> </body> </html>
8,设置div在屏幕中央
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> <style> #XY{ width:460px; height:300px; background:#aaa; } </style> </head> <body> <div id="XY"></div> <script> $(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; } //use $("#XY").center(); }); </script> </body> </html>
9,关闭和开启动画效果
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> <style> #XY{ width:40px; height:100px; background:#aaa; } </style> </head> <body> <button id="XY1" class="box">开始动画</button> <button id="XY2" class="box">关闭动画</button> <button id="XY3" class="box">开启动画</button> <div id="XY" class="box"></div> <script> $(document).ready(function() { $("#XY1").click(function(){ animateIt(); }); $("#XY2").click(function(){ jQuery.fx.off = true; }); $("#XY3").click(function(){ jQuery.fx.off = false; }); }); function animateIt() { $("#XY").slideToggle("slow"); } </script> </body> </html>
10,检测鼠标的右键和左键
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> <style> #XY{ width:40px; height:100px; background:#aaa; } </style> </head> <body> <div id="XY" class="box"></div> <script> $(document).ready(function() { $("#XY").mousedown(function(e){ alert(e.which) // 1 = 鼠标左键 ; 2 = 鼠标中键; 3 = 鼠标右键 }) }); </script> </body> </html>
11,回车提交表单
<!DOCTYPE> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> <style> #XY{ width:40px; height:100px; background:#aaa; } </style> </head> <body> <input type="input" /> <script> $(document).ready(function() { $("input").keyup(function(e){ if(e.which=="13"){ alert("回车提交!") } }) }); </script> </body> </html>
12,设置全局的ajax参数
<!DOCTYPE > <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="../../scripts/jquery.js" type="text/javascript"></script> <style> #load{ display:none; } </style> </head> <body> <div id="load">加载中...</div> <input type="button" id="send1" value="ajax"/> <div id="resText1"></div> <script> $(document).ready(function() { $(‘#send1‘).click(function() { $.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?tags=car&tagmode=any&format=json&jsoncallback=?",function(data){ $("#resText1").empty(); $.each(data.items, function( i,item ){ $("<img/> ").attr("src", item.media.m ).appendTo("#resText1"); if ( i == 3 ) { return false; } }); } ); }); $.ajaxPrefilter(function( options ) { options.global = true; }); $("#load").ajaxStart(function(){ showLoading(); //显示loading disableButtons(); //禁用按钮 }); $("#load").ajaxComplete(function(){ hideLoading(); //隐藏loading enableButtons(); //启用按钮 }); }); function showLoading(){ $("#load").show(); } function hideLoading(){ $("#load").hide(); } function disableButtons(){ $("#send1").attr("disabled","disabled"); } function enableButtons(){ $("#send1").removeAttr("disabled"); } </script> </body> </html>
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