Jquery使用小技巧下面列出了一些Jquery使用技巧。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。 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
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); } });}3. 在新窗口中打开链接
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>4. 检测浏览器
注: 在版本jQuery 1.4中，$.support 替换掉了$.browser 变量 $(document).ready(function() {// Target Firefox 2 and aboveif ($.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
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");});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
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
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>});11. 获得鼠标指针ＸＹ值
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> });12. 验证元素是否为空
This will allow you to check if an element is empty. $(document).ready(function() { if ($('#id').html()) { // do something }});13. 替换元素
Want to replace a div, or something else? $(document).ready(function() { $('#id').replaceWith('<DIV>I have been replaced</DIV> ');});14. jQuery延时加载功能
Want to delay something? $(document).ready(function() { window.setTimeout(function() { // do something }, 1000);});15. 移除单词功能
Want to remove a certain word(s)? $(document).ready(function() { var el = $('#id'); el.html(el.html().replace(/word/ig, ""));});16. 验证元素是否存在于jquery对象集合中
Simply test with the .length property if the element exists. $(document).ready(function() { if ($('#id').length) { // do something }});17. 使整个DIV可点击
Want to make the complete div clickable? $(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> });18. 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);});19. 克隆对象
Clone a div or an other element. $(document).ready(function() { var cloned = $('#id').clone();// how to use<DIV id=id></DIV> });20. 使元素居屏幕中间位置
Center an element in the center of your screen. $(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();});21. 写自己的选择器
Write your own selectors. $(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'); });});22. 统计元素个数
Count an element. $(document).ready(function() { $("p").size();});23. 使用自己的 Bullets
Want to use your own bullets instead of using the standard or images bullets? $(document).ready(function() { $("ul").addClass("Replaced"); $("ul > li").prepend("‒ "); // how to use ul.Replaced { list-style : none; }});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. [code]//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>[/code]
25. 禁用Jquery（动画）效果
Disable all jQuery effects $(document).ready(function() { jQuery.fx.off = true;});26. 与其他Javascript类库冲突解决方案
To avoid conflict other libraries on your website, you can use this jQuery Method, and assign a different variable name instead of the dollar sign. $(document).ready(function() { var $jq = jQuery.noConflict(); $jq('#id').show();});
Jquery使用小技巧
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