Jquery开发技巧（三）
21. 验证元素是否为空will allow you to check if an element is empty.
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$(document).ready(function() {
if ($('#id').html()) {
// do something
}
});
22. 替换元素
Want to replace a div, or something else?
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$(document).ready(function() {
$('#id').replaceWith('
<DIV>I have been replaced</DIV>
');
});
23. jQuery延时加载功能
Want to delay something?
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$(document).ready(function() {
window.setTimeout(function() {
// do something
}, 1000);
});
24. 移除单词功能
Want to remove a certain word(s)?
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$(document).ready(function() {
var el = $('#id');
el.html(el.html().replace(/word/ig, ""));
});
25. 验证元素是否存在于jquery对象集合中
Simply test with the .length property if the element exists.
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$(document).ready(function() {
if ($('#id').length) {
// do something
}
});
26. 使整个DIV可点击
Want to make the complete div clickable?
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$(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>});
27. ID与Class之间转换
当改变Window大小时，在ID与Class之间切换
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$(document).ready(function() {
function checkWindowSize() {
if ( $(window).width() > 1200 ) {
$('body').addClass('large');
} else {
$('body').removeClass('large');
}
}
$(window).resize(checkWindowSize);
});
28. 克隆对象
Clone a div or an other element.
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$(document).ready(function() {
var cloned = $('#id').clone();// how to use<DIV id=id></DIV>});
29. 使元素居屏幕中间位置
Center an element in the center of your screen.
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$(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;
}
$("#id").center();
});
30. 写自己的选择器
Write your own selectors.
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$(document).ready(function() {
$.extend($.expr[':'], {
moreThen1000px: function(a) {
return $(a).width() > 1000;
}
});
$('.box:moreThen1000px').click(function() {
// creating a simple js alert box
alert('The element that you have clicked is over 1000 pixels wide');
});
});
31. 统计元素个数
Count an element.
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$(document).ready(function() {
$("p").size();
});
32. 使用自己的 Bullets
Want to use your own bullets instead of using the standard or images bullets?
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$(document).ready(function() {
$("ul").addClass("Replaced");
$("ul > li").prepend("‒ "); // how to use
ul.Replaced { list-style : none; }
});
33. 引用Google主机上的Jquery类库
Let Google host the jQuery script for you. This can be done in 2 ways.
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//Example 1
<SCRIPT src="http://www.google.com/jsapi"></SCRIPT>
<SCRIPT type=text/javascript>
google.load("jquery", "1.2.6");
google.setOnLoadCallback(function() {
// do something
});
</SCRIPT><SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
// Example 2:(the best and fastest way)
<SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
34. 禁用Jquery（动画）效果
Disable all jQuery effects
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$(document).ready(function() {
jQuery.fx.off = true;
});
35. 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.
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$(document).ready(function() {
var $jq = jQuery.noConflict();
$jq('#id').show();
});
受教了！这个论坛果然很不错，适合学习
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