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^="", "_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/" 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/> <SCRIPT type=text/javascript> google.load("jquery", "1.2.6"); google.setOnLoadCallback(function() { // do something }); </SCRIPT><SCRIPT src="http://huhaiqia.blog.163.com/blog/" type=text/javascript></SCRIPT> // Example 2:(the best and fastest way) <SCRIPT src="http://huhaiqia.blog.163.com/blog/" 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(); });