Jquery使用小技巧(1)

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

$(document).ready(function() {// Target Firefox 2 and aboveif ($.browser.mozilla && $.browser.version >= "1.8" ){    // do something} // Target Safariif( $.browser.safari ){    // do something} // Target Chromeif( $.browser.chrome){    // do something} // Target Caminoif( $.browser.camino){    // do something} // Target Operaif( $.browser.opera){    // do something} // Target IE6 and belowif ($.browser.msie && $.browser.version <= 6 ){    // do something} // Target anything above IE6if ($.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   }});

英文原文：http://www.opensourcehunter.com/2010/02/27/26-cool-and-usefull-jquery-tips-tricks-solutions/