:focus

jquery.api.3.2.1中文手册

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快速查询核心 jQuery([selector,[context]]) jQuery(html,[ownerDocument]) jQuery(callback) jQuery.holdReady(hold) jQuery.readyException( error ) each(callback) size() length selector context get([index]) index([selector|element]) data([key],[value]) removeData([name|list]) jQuery.data(element,[key],[value]) queue(element,[queueName]) dequeue([queueName]) clearQueue([queueName]) jQuery.fn.extend(object) jQuery.extend(object) jQuery.noConflict([extreme]) 选择器 #id element .class * selector1,selector2,selectorN ancestor descendant parent > child prev + next prev ~ siblings :first :not(selector) :even :odd :eq(index) :gt(index) :lang(language) :last() :lt(index) :header :animated :focus :root :target :contains(text) :empty :has(selector) :parent :hidden :visible [attribute] [attribute=value] [attribute!=value] [attribute^=value] [attribute*=value] [selector1][selector2][selectorN] :first-child :first-of-type :last-child :last-of-type :nth-child :nth-last-child(n|even|odd|formula) :nth-last-of-type(n|even|odd|formula) :nth-of-type(n|even|odd|formula) :only-child :only-of-type :input :text :password :radio :checkbox :submit :image :reset :button :file :enabled :disabled :checked :selected $.escapeSelector(selector) AJAx $.ajax(url,[settings]) $.get(url,[data],[fn],[type]) $.getJSON(url,[data],[fn]) $.getScript(url,[callback]) $.post(url,[data],[fn],[type]) ajaxComplete(callback) ajaxError(callback) ajaxSend(callback) ajaxStart(callback) ajaxStop(callback) ajaxSuccess(callback) $.ajaxPrefilter([type],fn) $.ajaxSetup([options]) load(url, [data], [callback]) serialize() serializeArray() 属性 attr(name|properties|key,value|fn) removeAttr(name) prop(n|p|k,v|f) removeProp(name) addClass(class|fn) removeClass([class|fn]) toggleClass(class|fn[,sw]) html([val|fn]) text([val|fn]) val([val|fn|arr]) CSS css(name|pro|[,val|fn]) jQuery.cssHooks offset([coordinates]) position() scrollTop([val]) scrollLeft([val]) height([val|fn]) width([val|fn]) innerHeight() innerWidth() 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文字

返回值:jQuery

概述

匹配当前获取焦点的元素。

如同其他伪类选择器（那些以":"开始），建议:focus前面用标记名称或其他选择;否则，通用选择("*")是不言而喻的。换句话说，$(':focus')等同为$('*:focus')。如果你正在寻找当前的焦点元素，$( document.activeElement )将检索，而不必搜索整个DOM树。

示例

描述:

添加一个"focused"的类名给那些有focus方法的元素

css 代码:

.focused {
    background: #abcdef;
}

html 代码:

<div id="content">
    <input tabIndex="1">
    <input tabIndex="2">
    <select tabIndex="3">
        <option>select menu</option>
    </select>
    <div tabIndex="4">
        a div
    </div>
</div>

jQuery 代码:

$( "#content" ).delegate( "*", "focus blur", function( event ) {
    var elem = $( this );
    setTimeout(function() {
       elem.toggleClass( "focused", elem.is( ":focus" ) );
    }, 0);
});