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 useopen link
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}});
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.
$(document).ready(function() {jquery.preloadimages = function(){ for(var i = 0; i tallest) { tallest = thisheight; } }); group.height(tallest);}// how to use$(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// the linkgo to top});
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
});
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('i have been replaced
');});
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 usehome
});
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
});
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
[/code>http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js>[/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();});