Prototype 1.6 - Utility Mothed
Prototype 常用的方法
$(), $$(), $A(), $F(), $H(), $R(), $w()
Try.these(), document.getElementsByClassName()
$()方法
语法
$(id | element) -> HTMLElement
$((id | element)...) -> [HTMLElement...]
描述
If provided with a string, returns the element in the document with matching ID; otherwise returns the passed element. Takes in an arbitrary number of arguments. All elements returned by the function are extended with Prototype DOM extensions.
示例
function foo(element) {
element = $(element);
}
$$()方法
语法
$$(cssRule...) -> [HTMLElement...]
描述
Takes an arbitrary number of CSS selectors (strings) and returns a document-order array of extended DOM elements that match any of them.
$$('div')
// -> all DIVs in the document. Same as document.getElementsByTagName('div')!
$$('#contents')
// -> same as $('contents'), only it returns an array anyway.
$$('li.faux')
// -> all LI elements with class 'faux'
$$('#contents a[rel]')
// -> all links inside the element of ID "contents" with a rel attribute
$$('a[href="#"]')
// -> all links with a href attribute of value "#" (eyeew!)
$$('#navbar li', '#sidebar li')
// -> all links within the elements of ID "navbar" or "sidebar"
$A()
$A(iterable) -> actualArray
$F()方法
$F(element) -> value
<body>
<div id="one" class="foo">Single class name</div>
<div id="two" class="foo bar thud">Multiple class names</div>
<ul id="list">
<li id="item_one" class="thud">List item 1</li>
<li>List item 2</li>
<li id="item_two" class="thud">List item 3</li>
</ul>
</body>
document.getElementsByClassName('foo');
// -> [HTMLElement, HTMLElement] (div#one, div#two)
document.getElementsByClassName('thud');
// -> [HTMLElement, HTMLElement, HTMLElement] (div#two, li#item_one, li#item_two);
document.getElementsByClassName('thud', $('list'));
// -> [HTMLElement, HTMLElement] (li#item_one, li#item_two)
Try.these()方法
getTransport: function() {
return Try.these(
function() { return new XMLHttpRequest() },
function() { return new ActiveXObject('Msxml2.XMLHTTP') },
function() { return new ActiveXObject('Microsoft.XMLHTTP') }
) || false;
}
