下面列出了一些Jquery使用技巧。比如有禁止右鍵點擊、隱藏搜索文本框文字、在新窗口中打開鏈接、檢測瀏覽器、預加載圖片、頁面樣式切換、所有列等高、動態控制頁面字體大小、獲得鼠標指針的X值Y值、驗證元素是否為空、替換元素、延遲加載、驗證元素是否存在于Jquery集合中、使DIV可點擊、克隆對象、使元素居中、計算元素個數、使用Google主機上的Jquery類庫、禁用Jquery效果、解決Jquery類庫與其他javascript類庫沖突問題。
1. 禁止右鍵點擊
1 2 3 4 5 | $(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)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | $(document).ready(function() {$("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.
1 2 3 4 5 6 7 8 9 10 11 | $(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> |
注: 在版本jQuery 1.4中，$.support 替換掉了$.browser 變量
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | $(document).ready(function() {// Target Firefox 2 and aboveif ($.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.
1 2 3 4 5 6 7 8 9 | $(document).ready(function() {jQuery.preloadImages = function(){ for(var i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src", arguments[i]); }}// how to use$.preloadImages("image1.jpg");}); |
1 2 3 4 5 6 7 8 9 10 11 12 13 | $(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// 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>}); |
如果使用了兩個CSS列，使用此種方式可以是兩列的高度相同。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | $(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"));});}); |
用戶可以改變頁面字體大小
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | $(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).
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | $(document).ready(function() {$('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?
1 2 3 4 5 6 7 8 9 | $(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>}); |
This will allow you to check if an element is empty.
1 2 3 4 5 | $(document).ready(function() { if ($('#id').html()) { // do something }}); |
Want to replace a div, or something else?
1 2 3 4 5 6 | $(document).ready(function() { $('#id').replaceWith('<DIV>I have been replaced</DIV>');}); |
Want to delay something?
1 2 3 4 5 | $(document).ready(function() { window.setTimeout(function() { // do something }, 1000);}); |
Want to remove a certain Word(s)?
1 2 3 4 | $(document).ready(function() { var el = $('#id'); el.html(el.html().replace(/word/ig, ""));}); |
Simply test with the .length property if the element exists.
1 2 3 4 5 | $(document).ready(function() { if ($('#id').length) { // do something }}); |
Want to make the complete div clickable?
1 2 3 4 5 6 7 8 9 | $(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>}); |
當改變Window大小時，在ID與Class之間切換
1 2 3 4 5 6 7 8 9 10 11 | $(document).ready(function() { function checkWindowSize() { if ( $(window).width() > 1200 ) { $('body').addClass('large'); } else { $('body').removeClass('large'); } }$(window).resize(checkWindowSize);}); |
Clone a div or an other element.
1 2 3 4 5 6 | $(document).ready(function() { var cloned = $('#id').clone();// how to use<DIV id=id></DIV>}); |
Center an element in the center of your screen.
1 2 3 4 5 6 7 8 9 | $(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();}); |
Write your own selectors.
1 2 3 4 5 6 7 8 9 10 11 | $(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'); });}); |
Count an element.
1 2 3 | $(document).ready(function() { $("p").size();}); |
Want to use your own bullets instead of using the standard or images bullets?
1 2 3 4 5 6 | $(document).ready(function() { $("ul").addClass("Replaced"); $("ul > li").prepend("? "); // how to use ul.Replaced { list-style : none; }}); |
Let Google host the jQuery script for you. This can be done in 2 ways.
1 2 3 4 5 6 7 8 9 10 11 | //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> |
Disable all jQuery effects
1 2 3 | $(document).ready(function() { jQuery.fx.off = true;}); |
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.
1 2 3 4 | $(document).ready(function() { var $jq = jQuery.noConflict(); $jq('#id').show();}); |
英文原文：26-cool-and-usefull-jquery-tips-tricks-solutions
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