jQuery 1.4實用技巧大放送
jQuery 1.4給開發(fā)者帶來了很多值得興奮的新特性,同時使用jQuery的人也越來越多,為了方便大家對jQuery的使用,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、預加載圖片等等。具體如下:
禁止右鍵點擊
- $(document).ready(function(){
 - $(document).bind("contextmenu",function(e){
 - return false;
 - });
 - });
 
隱藏搜索文本框文字
- $(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); }
 - });
 - }
 
在新窗口中打開鏈接
- $(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>
 
檢測瀏覽器
注: 在版本jQuery 1.4中,$.support 替換掉了$.browser 變量。
- $(document).ready(function() {
 - // Target Firefox 2 and above
 - if ($.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
 - }
 - });
 
預加載圖片
- $(document).ready(function() {
 - jQuery.preloadImages = function()
 - {
 - for(var i = 0; i").attr("src", arguments[i]);
 - }
 - };
 - // how to use
 - $.preloadImages("image1.jpg");
 - });
 
頁面樣式切換
- $(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="default.css" type=text/css rel=stylesheet>
 - // 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>
 - });
 
#p#
列高度相同
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。
- $(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"));
 - });
 - });
 
動態(tài)控制頁面字體大小
- $(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;
 - });
 - });
 
返回頁面頂部功能
- $(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>
 - });
 
獲得鼠標指針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>
 - });
 
驗證元素是否為空
- $(document).ready(function() {
 - if ($('#id').html()) {
 - // do something
 - }
 - });
 
替換元素
- $(document).ready(function() {
 - $('#id').replaceWith('
 - <DIV>I have been replaced</DIV>
 - );
 - });
 
#p#
jQuery延時加載功能
- $(document).ready(function() {
 - window.setTimeout(function() {
 - // do something
 - }, 1000);
 - });
 
移除單詞功能
- $(document).ready(function() {
 - var el = $('#id');
 - el.html(el.html().replace(/word/ig, ""));
 - });
 
驗證元素是否存在于jQuery對象集合中
- $(document).ready(function() {
 - if ($('#id').length) {
 - // do something
 - }
 - });
 
使整個DIV可點擊
- $(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>
 - });
 - ID與Class之間轉換當改變Window大小時,在ID與Class之間切換
 - $(document).ready(function() {
 - function checkWindowSize() {
 - if ( $(window).width() > 1200 ) {
 - $('body').addClass('large');
 - }
 - else {
 - $('body').removeClass('large');
 - }
 - }
 - $(window).resize(checkWindowSize);
 - });
 
克隆對象
- $(document).ready(function() {
 - var cloned = $('#id').clone();
 - // how to use
 - <DIV idid=id></DIV>
 - });
 
使元素居屏幕中間位置
- $(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();
 - });
 
寫自己的選擇器
- $(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');
 - });
 - });
 
統(tǒng)計元素個數(shù)
- $(document).ready(function() {
 - $("p").size();
 - });
 
使用自己的Bullets
- $(document).ready(function() {
 - $("ul").addClass("Replaced");
 - $("ul > li").prepend("‒ ");
 - // how to use
 - ul.Replaced { list-style : none; }
 - });
 
引用Google主機上的jQuery類庫
- //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 src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type=text/javascript></SCRIPT>
 - // Example 2:(the best and fastest way)
 - <SCRIPT src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type=text/javascript></SCRIPT>
 
禁用jQuery(動畫)效果
- $(document).ready(function() {
 - jQuery.fx.off = true;
 - });
 
與其他JavaScript類庫沖突解決方案
- $(document).ready(function() {
 - var $jq = jQuery.noConflict();
 - $jq('#id').show();
 - });
 
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