程序员必知35个jQuery 代码片段

$(document).ready(function(){  $(document).bind("contextmenu",function(e){    return false;  });});

Hide when clicked in the search field, the value.(example can be found below in the comment fields)$(document).ready(function() {$("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); }   });}

XHTML 1.0 Strict doesn't allow this attribute in the code, so use this to keep the code valid.$(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>

$(document).ready(function() {// Target Firefox 2 and aboveif ($.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}});

This piece of code will prevent the loading of all images, which can be useful if you have a site with lots of images.$(document).ready(function() {jQuery.preloadImages = function(){ for(var i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src", arguments[i]); }}// how to use$.preloadImages("image1.jpg");});

$(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 href="#" rel=default.css>Default Theme</A><A href="#" rel=red.css>Red Theme</A><A href="#" rel=blue.css>Blue Theme</A>});

$(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"));});});

$(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; });});

For a smooth(animated) ride back to the top(or any location).$(document).ready(function() {$('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>});

Want to know where your mouse cursor is?$(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>});

// Back to top$('a.top').click(function () { $(document.body).animate({scrollTop: 0}, 800); return false;});<!-- Create an anchor tag --><a href="#">Back to top</a>

$.preloadImages = function () { for (var i = 0; i < arguments.length; i++) {  $('<img>').attr('src', arguments[i]); }};$.preloadImages('img/hover1.png', 'img/hover2.png');

$('img').load(function () { console.log('image load successful');});

$('img').on('error', function () { $(this).prop('src', 'img/broken.png');});

$('.btn').hover(function () { $(this).addClass('hover'); }, function () {  $(this).removeClass('hover'); });你只需要添加必要的CSS代码即可。如果你想要更简洁的代码，可以使用 toggleClass 方法：$('.btn').hover(function () {  $(this).toggleClass('hover'); });

$('a.no-link').click(function (e) { e.preventDefault();});

// Fade$('.btn').click(function () { $('.element').fadeToggle('slow');});// Toggle$('.btn').click(function () { $('.element').slideToggle('slow');});

// Close all panels$('#accordion').find('.content').hide();// Accordion$('#accordion').find('.accordion-header').click(function () { var next = $(this).next(); next.slideToggle('fast'); $('.content').not(next).slideUp('fast'); return false;});

var $columns = $('.column');var height = 0;$columns.each(function () { if ($(this).height() > height) {  height = $(this).height(); }});$columns.height(height);

This will allow you to check if an element is empty.$(document).ready(function() { if ($('#id').html()) {  // do something  }});

$(document).ready(function() {  $('#id').replaceWith('<DIV>I have been replaced</DIV>');});

$(document).ready(function() {  window.setTimeout(function() {   // do something  }, 1000);});

$(document).ready(function() {  var el = $('#id');  el.html(el.html().replace(/word/ig, ""));});

$(document).ready(function() {  if ($('#id').length) { // do something }});

$(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>});

$(document).ready(function() {  function checkWindowSize() {  if ( $(window).width() > 1200 ) {    $('body').addClass('large');  }  else {    $('body').removeClass('large');  }  }$(window).resize(checkWindowSize);});

$(document).ready(function() {  var cloned = $('#id').clone();// how to use<DIV id=id></DIV>});

$(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();});

$(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'); });});

$(document).ready(function() {  $("p").size();});

$(document).ready(function() {  $("ul").addClass("Replaced");  $("ul > li").prepend("‒ "); // how to use ul.Replaced { list-style : none; }});

//Example 1<SCRIPT src="http://www.google.com/jsapi"></SCRIPT><SCRIPT type=text/javascript>google.load("jquery", "1.2.6");google.setOnLoadCallback(function() {  // do something});</SCRIPT><SCRIPT type=text/javascript src="http://ajax.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>

$(document).ready(function() {  jQuery.fx.off = true;});

$(document).ready(function() {  var $jq = jQuery.noConflict();  $jq('#id').show();});