30个经典的jQuery代码开发技巧

前端技术 2023/09/03 JavaScript

本文实例总结了30个经典的jQuery代码开发技巧。分享给大家供大家参考。具体如下：

1. 创建一个嵌套的过滤器

复制代码 代码如下:
.filter(\":not(:has(.selected))\") //去掉所有不包含class为.selected的元素

2. 重用你的元素查询

复制代码 代码如下:
var allItems = $(\"div.item\");
var keepList = $(\"div#container1 div.item\");
<div>class names: $(formToLookAt + \" input:checked\").each(function() { keepListkeepList = keepList.filter(\".\" + $(this).attr(\"name\"));
});
</div>

3. 使用has()来判断一个元素是否包含特定的class或者元素

复制代码 代码如下:
//jQuery 1.4.* includes support for the has method. This method will find
//if a an element contains a certain other element class or whatever it is
//you are looking for and do anything you want to them.
$(\"input\").has(\".email\").addClass(\"email_icon\");

4. 使用jQuery切换样式

复制代码 代码如下:
//Look for the media-type you wish to switch then set the href to your new style sheet
$(\'link[media=\'screen\']\').attr(\'href\', \'Alternative.css\');

5. 限制选择的区域

复制代码 代码如下:
//Where possible, pre-fix your class names with a tag name
//so that jQuery doesn\'t have to spend more time searching
//for the element you\'re after. Also remember that anything
//you can do to be more specific about where the element is
//on your page will cut down on execution/search times
var in_stock = $(\'#shopping_cart_items input.is_in_stock\');
<ul id=\"shopping_cart_items\">
<li> <input value=\"Item-X\" name=\"item\" type=\"radio\"> Item X</li>
<li> <input value=\"Item-Y\" name=\"item\" type=\"radio\"> Item Y</li>
<li> <input value=\"Item-Z\" name=\"item\" type=\"radio\"> Item Z</li>
</ul>

6. 如何正确使用ToggleClass

复制代码 代码如下:
//Toggle class allows you to add or remove a class
//from an element depending on the presence of that
//class. Where some developers would use:
a.hasClass(\'blueButton\') ? a.removeClass(\'blueButton\') : a.addClass(\'blueButton\');
//toggleClass allows you to easily do this usinga.toggleClass(\'blueButton\');

7. 设置IE指定的功能

复制代码 代码如下:
if ($.browser.msie) {
// Internet Explorer is a sadist.
}

8. 使用jQuery来替换一个元素

复制代码 代码如下:
$(\'#thatdiv\').replaceWith(\'fnuh\');

9. 验证一个元素是否为空

复制代码 代码如下:
if ($(\'#keks\').html()) {
//Nothing found ;
}

10. 在无序的set中查找一个元素的索引

复制代码 代码如下:
$(\"ul > li\").click(function () { var index = $(this).prevAll().length; });

11. 绑定一个函数到一个事件

复制代码 代码如下:
$(\'#foo\').bind(\'click\', function() { alert(\'User clicked on \"foo.\"\'); });

12. 添加HTML到一个元素

复制代码 代码如下:
$(\'#lal\').append(\'sometext\');

13. 创建元素时使用对象来定义属性

复制代码 代码如下:
var e = $(\"\", { href: \"#\", class: \"a-class another-class\", title: \"...\" });

14. 使用过滤器过滤多属性

复制代码 代码如下:
//This precision-based approached can be useful when you use
//lots of similar input elements which have different types
var elements = $(\'#someid input[type=sometype][value=somevalue]\').get();

15. 使用jQuery预加载图片

复制代码 代码如下:
jQuery.preloadImages = function() { for(var i = 0; i\').attr(\'src\', arguments[i]); } };
// Usage $.preloadImages(\'image1.gif\', \'/path/to/image2.png\', \'some/image3.jpg\');

16. 设置任何匹配一个选择器的事件处理程序
[code]$(\'button.someClass\').live(\'click\', someFunction);
//Note that in jQuery 1.4.2, the delegate and undelegate options have been
//introduced to replace live as they offer better support for context
//For example, in terms of a table where before you would use..
//
.live() $(\"table\").each(function(){ $(\"td\", this).live(\"hover\", function(){ $(this).toggleClass(\"hover\"); }); });
//Now use..
$(\"table\").delegate(\"td\", \"hover\", function(){ $(this).toggleClass(\"hover\"); });

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