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一个隐藏的DOM是获取不到宽高的,如果想要获取,采用下面的方法:
首先clone一个DOM,设置position:absolute,然后设置top为一个比较大的负值,然后使其显示出来,最后获取到了DOM的宽高后,将其remove。 具体代码如下: Js代码 复制代码 代码如下: function getCss(elem, css){ if (window.getComputedStyle) { return window.getComputedStyle(elem, null)[css]; }else if (elem.currentStyle) { return elem.currentStyle[css]; }else { return elem.style[css]; } } function getWH(dom){ var get = function(elem){ var wh = {}; 'Width Height'.replace(/[^ ]+/g, function(i){ var a = i.toLowerCase(); wh[a] = elem['offset' + i] || elem['client' + i]; }); return wh; }; if (getCss(dom, 'display') === 'none') { var nDom = dom.cloneNode(true); nDom.style.position = 'absolute'; nDom.style.top = '-3000px'; nDom.style.display = 'block'; document.getElementsByTagName('body')[0].appendChild(nDom); var wh = get(nDom); nDom.parentNode.removeChild(nDom); return wh; } return get(dom); } //test console.log(getWH(document.getElementById('content'))); var domA = document.createElement("a"), _ostyle = "position:absolute;z-index:999999;width:92px;height:22px;position:absolute;display:none;"; domA.setAttribute("style", _ostyle); domA.style.cssText = _ostyle; domA.setAttribute("href", "javascript:void(0);"); document.getElementsByTagName('body')[0].appendChild(o); console.log(getWH(domA)); function getCss(elem, css){ if (window.getComputedStyle) { return window.getComputedStyle(elem, null)[css]; }else if (elem.currentStyle) { return elem.currentStyle[css]; }else { return elem.style[css]; } } function getWH(dom){ var get = function(elem){ var wh = {}; 'Width Height'.replace(/[^ ]+/g, function(i){ var a = i.toLowerCase(); wh[a] = elem['offset' + i] || elem['client' + i]; }); return wh; }; if (getCss(dom, 'display') === 'none') { var nDom = dom.cloneNode(true); nDom.style.position = 'absolute'; nDom.style.top = '-3000px'; nDom.style.display = 'block'; document.getElementsByTagName('body')[0].appendChild(nDom); var wh = get(nDom); nDom.parentNode.removeChild(nDom); return wh; } return get(dom); } //test console.log(getWH(document.getElementById('content'))); var domA = document.createElement("a"), _ostyle = "position:absolute;z-index:999999;width:92px;height:22px;position:absolute;display:none;"; domA.setAttribute("style", _ostyle); domA.style.cssText = _ostyle; domA.setAttribute("href", "javascript:void(0);"); document.getElementsByTagName('body')[0].appendChild(o); console.log(getWH(domA));
还有其他更好的方法欢迎提出来。 |
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