Jquery使用小技巧汇总(2)

$(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
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(' <DIV>I have been replaced</DIV> '); });

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 use <DIV><A href="https://www.jb51.net/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
Clone a div or an other element.

$(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
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
<SCRIPT src=""></SCRIPT>
<SCRIPT type=text/javascript>
google.load("jquery", "1.2.6");
google.setOnLoadCallback(function() {
    // do something
});
</SCRIPT><SCRIPT type=text/javascript src=""></SCRIPT>
 
 // Example 2:(the best and fastest way)
<SCRIPT type=text/javascript src=""></SCRIPT>[/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(); });

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