案例說明

當(dāng)DOM元素被添加上display:none;的樣式時(shí)，這個(gè)元素和它的子元素?zé)o法獲取到實(shí)際的寬高。
如圖，我設(shè)置了一個(gè)父元素和一個(gè)子元素，并且通過一個(gè)按鈕切換父元素是否帶有display:none;。

然后每次點(diǎn)擊按鈕后，在控制臺輸出兩個(gè)元素的高度。

可以看到，當(dāng)元素正常顯示時(shí)，獲取寬高正常。而當(dāng)元素添加上`display:none;`之后，獲取到的值變?yōu)?.

解決方法

使用jquery的actual方法可以很方便的獲取到元素的真實(shí)寬高。
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.actual/1.0.19/jquery.actual.min.js"></script>
語法格式
//獲取帶有.hidden類的元素的實(shí)際高度
$('.hidden').actual('height');
使用actual方法后獲取寬高正常，無論元素有沒有被設(shè)置display:none;。(下圖中兩次輸出，一次是帶有display:none;的，一次是沒有的，均能獲取到實(shí)際高度)

原理：設(shè)置display:none;的元素沒有物理尺寸，而同樣能提供隱形效果的visibility則有物理尺寸，但是不能直接用visibility:hidden;代替display:none;，因?yàn)樵O(shè)置visibility之后的元素還是會占用頁面空間的。正確的解決方法是要獲取寬度或者高度時(shí)，首先將display:none;更換成display:block;,然后設(shè)置visibility讓其隱形，從而獲取實(shí)際寬高。

這里需要注意的是，當(dāng)元素設(shè)置為塊級元素時(shí)，可能會因?yàn)槠浯笮∈沟弥車脑乇煌苿樱虼宋覀冊讷@取某個(gè)元素的實(shí)際寬高時(shí)，除了設(shè)置display和visibility，還要設(shè)置position:absolute;,在獲取到寬高值之后取消掉。

這個(gè)實(shí)現(xiàn)方法其實(shí)就是jquery的actual方法的內(nèi)容：

源地址jquery.actual:Get the actual width/height of invisible DOM elements with jQuery.

如果打不開github也可以看下面的代碼(jquery.actual.js的代碼內(nèi)容)

/*! Copyright 2012, Ben Lin (http://dreamerslab.com/) * Licensed under the MIT License (LICENSE.txt). * * Version: 1.0.19 * * Requires: jQuery >= 1.2.3 */;( function ( factory ) {if ( typeof define === "function" && define.amd ) {    // AMD. Register module depending on jQuery using requirejs define.    define( ["jquery"], factory );} else {    // No AMD.    factory( jQuery );}}( function ( $ ){  $.fn.addBack = $.fn.addBack || $.fn.andSelf;  $.fn.extend({    actual : function ( method, options ){      // check if the jQuery method exist      if( !this[ method ]){throw "$.actual => The jQuery method "" + method + "" you called does not exist";      }      var defaults = {absolute      : false,clone : false,includeMargin : false,display       : "block"      };      var configs = $.extend( defaults, options );      var $target = this.eq( 0 );      var fix, restore;      if( configs.clone === true ){fix = function (){  var style = "position: absolute !important; top: -1000 !important; ";  // this is useful with css3pie  $target = $target.    clone().    attr( "style", style ).    appendTo( "body" );};restore = function (){  // remove DOM element after getting the width  $target.remove();};      }else{var tmp   = [];var style = "";var $hidden;fix = function (){  // get all hidden parents  $hidden = $target.parents().addBack().filter( ":hidden" );  style   += "visibility: hidden !important; display: " + configs.display + " !important; ";  if( configs.absolute === true ) style += "position: absolute !important; ";  // save the origin style props  // set the hidden el css to be got the actual value later  $hidden.each( function (){    // Save original style. If no style was set, attr() returns undefined    var $this     = $( this );    var thisStyle = $this.attr( "style" );    tmp.push( thisStyle );    // Retain as much of the original style as possible, if there is one    $this.attr( "style", thisStyle ? thisStyle + ";" + style : style );  });};restore = function (){  // restore origin style values  $hidden.each( function ( i ){    var $this = $( this );    var _tmp  = tmp[ i ];    if( _tmp === undefined ){      $this.removeAttr( "style" );    }else{      $this.attr( "style", _tmp );    }  });};      }      fix();      // get the actual value with user specific methed      // it can be "width", "height", "outerWidth", "innerWidth"... etc      // configs.includeMargin only works for "outerWidth" and "outerHeight"      var actual = /(outer)/.test( method ) ?$target[ method ]( configs.includeMargin ) :$target[ method ]();      restore();      // IMPORTANT, this plugin only return the value of the first element      return actual;    }  });}));

actual方法的參數(shù)

Example Code:(來源于jquery.actual github項(xiàng)目說明)// get hidden element actual width$( ".hidden" ).actual( "width" );// get hidden element actual innerWidth$( ".hidden" ).actual( "innerWidth" );// get hidden element actual outerWidth$( ".hidden" ).actual( "outerWidth" );// get hidden element actual outerWidth and set the `includeMargin` argument$( ".hidden" ).actual( "outerWidth", { includeMargin : true });// get hidden element actual height$( ".hidden" ).actual( "height" );// get hidden element actual innerHeight$( ".hidden" ).actual( "innerHeight" );// get hidden element actual outerHeight$( ".hidden" ).actual( "outerHeight" );// get hidden element actual outerHeight and set the `includeMargin` argument$( ".hidden" ).actual( "outerHeight", { includeMargin : true });// if the page jumps or blinks, pass a attribute "{ absolute : true }"http:// be very careful, you might get a wrong result depends on how you makrup your html and css$( ".hidden" ).actual( "height", { absolute : true });// if you use css3pie with a float element// for example a rounded corner navigation menu you can also try to pass a attribute "{ clone : true }"http:// please see demo/css3pie in action$( ".hidden" ).actual( "width", { clone : true });// if it is not a block element. By default { display: "block" }.// for example a inline element$( ".hidden" ).actual( "width", { display: "inline-block" });

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