juqery 学习之三 选择器--<子元素><表单>
时间：2010-11-25 来源：SIMON_YAO
Matches the nth-child of its parent.
While ':eq(index)' matches only a single element, this matches more then one: One for each parent. The specified index is one-indexed, in contrast to :eq() which starst at zero.
<li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
<li>Tane</li>
<li>Ralph</li>
</ul>
--------------------------------------------------------------------------------
返回值
Array<Element>
参数
index (Number) : 要匹配元素的序号，从1开始
示例
在每个 ul 查找第 2 个li
HTML 代码:
<ul><li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
<li>Tane</li>
<li>Ralph</li>
</ul>
jQuery 代码:
$("ul li:nth-child(2)")结果:
[ <li>Karl</li>, <li>Tane</li> ]--------------------------------------------------------------------------------
:first-child
匹配第一个子元素 ':first' 只匹配一个元素，而此选择符将为每个父元素匹配一个子元素
Matches the first child of its parent.
While ':first' matches only a single element, this matches more then one: One for each parent.
<li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
<li>Tane</li>
<li>Ralph</li>
</ul>
--------------------------------------------------------------------------------
返回值
Array<Element>
示例
在每个 ul 中查找第一个 li
HTML 代码:
<ul><li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
<li>Tane</li>
<li>Ralph</li>
</ul>
jQuery 代码:
$("ul li:first-child")结果:
[ <li>John</li>, <li>Glen</li> ]--------------------------------------------------------------------------------
:last-child
匹配最后一个子元素 ':last'只匹配一个元素，而此选择符将为每个父元素匹配一个子元素
Matches the last child of its parent.
While ':last' matches only a single element, this matches more then one: One for each parent.
<li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
<li>Tane</li>
<li>Ralph</li>
</ul>
--------------------------------------------------------------------------------
返回值
Array<Element>
示例
在每个 ul 中查找最后一个 li
HTML 代码:
<ul><li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
<li>Tane</li>
<li>Ralph</li>
</ul>
jQuery 代码:
$("ul li:last-child")结果:
[ <li>Brandon</li>, <li>Ralph</li> ]--------------------------------------------------------------------------------
:only-child
如果某个元素是父元素中唯一的子元素，那将会被匹配 如果父元素中含有其他元素，那将不会被匹配。
Matches the only child of its parent.
If the parent has other child elements, nothing is matched.
<li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
--------------------------------------------------------------------------------
返回值
Array<Element>
示例
在 ul 中查找是唯一子元素的 li
HTML 代码:
<ul><li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
jQuery 代码:
$("ul li:only-child")结果:
[ <li>Glen</li> ]--------------------------------------------------------------------------------
:input
匹配所有 input, textarea, select 和 button 元素
Matches all input, textarea, select and button elements.
<input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
--------------------------------------------------------------------------------
返回值
Array<Element>
示例
查找所有的input元素
HTML 代码:
<form><input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
jQuery 代码:
$(":input")结果:
[ <input type="text" />, <input type="checkbox" />, <input type="radio" />, <input type="image" />, <input type="file" />, <input type="submit" />, <input type="reset" />, <input type="password" />, <input type="button" /> ]--------------------------------------------------------------------------------
:text
匹配所有的单行文本框
Matches all input elements of type text.
<input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
--------------------------------------------------------------------------------
返回值
Array<Element>
示例
查找所有文本框
HTML 代码:
<form><input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
jQuery 代码:
$(":text")结果:
[ <input type="text" /> ]--------------------------------------------------------------------------------
:password
匹配所有密码框
Matches all input elements of type password.
<input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
--------------------------------------------------------------------------------
返回值
Array<Element>
示例
查找所有密码框
HTML 代码:
<form><input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
jQuery 代码:
$(":password")结果:
[ <input type="password" /> ]--------------------------------------------------------------------------------
:radio
匹配所有单选按钮
Matches all input elements of type radio.
<input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
--------------------------------------------------------------------------------
返回值
Array<Element>
示例
查找所有单选按钮
HTML 代码:
<form><input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
jQuery 代码:
$(":radio")结果:
[ <input type="radio" /> ]--------------------------------------------------------------------------------
:submit
匹配所有提交按钮
Matches all input elements of type submit.
<input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
其他的一些 都是一样的道理：image ,:reset,:button,:file,:hidden !@#@!%$%
返回值
Array<Element>
示例
查找所有提交按钮
HTML 代码:
<form><input type="text" />
<input type="checkbox" />
<input type="radio" />
<input type="image" />
<input type="file" />
<input type="submit" />
<input type="reset" />
<input type="password" />
<input type="button" />
<select><option/></select>
<textarea></textarea>
<button></button>
</form>
jQuery 代码:
$(":submit")结果:
[ <input type="submit" /> ]其他的一些 都是一样的道理：image ,:reset,:button,:file,:hidden !@#@!%$%
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