26个Jquery使用技巧(值得收藏)
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;
- });
- });
- $(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
注: 在版本jQuery 1.4中,$.support 替换掉了$.browser 变量
- $(document).ready(function(){
- // Target Firefox 2 and above
- if ($.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
- }
- });
- $(document).ready(function(){
- // Target Firefox 2 and above
- if ($.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
- }
- });
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
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
- $(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
- }
- });
13. 替换元素
- $(document).ready(function() {
- $('#id').replaceWith('
- <DIV>I have been replaced</DIV>
- ');
- });
14. jQuery延时加载功能
- $(document).ready(function() {
- window.setTimeout(function() {
- // do something
- }, 1000);
- });
15. 移除单词功能
- $(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
- $(document).ready(function() {
- if ($('#id').length) {
- // do something
- }
- });
17. 使整个DIV可点击
- $(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
- $(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
- $(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
- $(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
- $(document).ready(function() {
- $("p").size();
- });
23. 使用自己的 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
- //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>
25. 禁用Jquery(动画)效果
- $(document).ready(function() {
- jQuery.fx.off = true;
- });
26. 与其他Javascript类库冲突解决方案
- $(document).ready(function() {
- var $jq = jQuery.noConflict();
- $jq('#id').show();
- });