下面是css2 selector的语法,当然很多浏览器只是支持其中的一部分,Prototype 中的Selector主要支持tag选择器、class选择器和id选择器,还有属性(attribute)选择器,基本上包含我们平时所用的所有类型
The following table summarizes CSS2 selector syntax, 详细的可以看http://www.w3.org/TR/REC-CSS2/selector.html:
Pattern | Meaning | Described in section |
---|---|---|
* | Matches any element. | Universal selector |
E | Matches any E element (i.e., an element of type E). | Type selectors |
E F | Matches any F element that is a descendant of an E element. | Descendant selectors |
E > F | Matches any F element that is a child of an element E. | Child selectors |
E:first-child | Matches element E when E is the first child of its parent. | The :first-child pseudo-class |
E:link E:visited | Matches element E if E is the source anchor of a hyperlink of which the target is not yet visited (:link) or already visited (:visited). | The link pseudo-classes |
E:active E:hover E:focus | Matches E during certain user actions. | The dynamic pseudo-classes |
E:lang(c) | Matches element of type E if it is in (human) language c (the document language specifies how language is determined). | The :lang() pseudo-class |
E + F | Matches any F element immediately preceded by an element E. | Adjacent selectors |
E[foo] | Matches any E element with the “foo” attribute set (whatever the value). | Attribute selectors |
E[foo=”warning”] | Matches any E element whose “foo” attribute value is exactly equal to “warning”. | Attribute selectors |
E[foo~=”warning”] | Matches any E element whose “foo” attribute value is a list of space-separated values, one of which is exactly equal to “warning”. | Attribute selectors |
E[lang|=”en”] | Matches any E element whose “lang” attribute has a hyphen-separated list of values beginning (from the left) with “en”. | Attribute selectors |
DIV.warning | HTML only. The same as DIV[class~=”warning”]. | Class selectors |
E#myid | Matches any E element ID equal to “myid”. | ID selectors |
Selector에는 Selector 개체와 클래스가 포함되어 있습니다.
Selector 객체에는 다음 두 가지 메서드가 있습니다.
match(element): 요소가 이 선택기와 일치하는지 여부가 Element
findElements(parentNode): 목록에 도입되었습니다. 이 선택기와 일치하는 parentNode의 모든 하위 요소
사용 방법도 매우 간단합니다. var s=new Selector(expression) s.match(element); s.findElements($(element)), 여기서 expression은 다음과 같습니다. 다음과 같습니다" div", "#id", ".class", "div#id", "div[attribute]", "div[attribute=fff]", "div[attribute!=sdf]"
Selector에는 다음과 같은 여러 정적 메서드도 있습니다.
matchElements(elements, 표현식): 표현식과 일치하는 요소의 요소 목록을 반환합니다 $$ 메소드: 단순히 return Selector.findChildElements(document, $A(arguments))
findElement(elements, 표현식, 인덱스): 요소 반환 표현식
findChildElements(element,expressions): 다음의 하위 요소를 찾습니다. 요소 표현식과 일치하는 요소 목록입니다. 여기서 표현식은 표현식 배열이며 표현식은 "div li.#id" 형식을 지원합니다.