js code for Iframe adaptive height and real-time monitoring of height changes-JS Tutorial-php.cn

js code for Iframe adaptive height and real-time monitoring of height changes

高洛峰

Release： 2017-01-09 09:23:16

Original

1644 people have browsed it

Google N times + Baidu M times + After testing 1605 times (I heard that pesticide 1605 came out after testing so many times), the following results were obtained. I tried it in IE7 and Firefox3 and it still works. !
1. First give an Iframe.

<iframe id="ifrm" 
marginheight="0" 
marginwidth="0" 
height="100" 
width="1000" 
frameborder="0" 
scrolling="no" 
src="xxxxx.html"> 
</iframe>

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2. Then see how to get the height of the page in the Iframe.
In fact, the most troublesome thing is how to make the acquisition highly accurate. The values obtained in different ways and different browsers will be different! Dizzy~~. After referring to many opinions, we came up with the following javascript function (the doc parameter is the window.document object):

function getDocHeight(doc) 
{ 
//在IE中doc.body.scrollHeight的可信度最高 
//在Firefox中，doc.height就可以了 
var docHei = 0; 
var scrollHei;//scrollHeight 
var offsetHei;//offsetHeight，包含了边框的高度 
if (doc.height) 
{ 
//Firefox支持此属性，IE不支持 
docHei = doc.height; 
} 
else if (doc.body) 
{ 
//在IE中，只有body.scrollHeight是与当前页面的高度一致的， 
//其他的跳转几次后就会变的混乱，不知道是依照什么取的值！ 
//似乎跟包含它的窗口的大小变化有关 
if(doc.body.offsetHeight) docHei = offsetHei = doc.body.offsetHeight; 
if(doc.body.scrollHeight) docHei = scrollHei = doc.body.scrollHeight; 
} 
else if(doc.documentElement) 
{ 
if(doc.documentElement.offsetHeight) docHei = offsetHei = doc.documentElement.offsetHeight; 
if(doc.documentElement.scrollHeight) docHei = scrollHei = doc.documentElement.scrollHeight; 
} 
/* 
docHei = Math.max(scrollHei,offsetHei);//取最大的值，某些情况下可能与实际页面高度不符！ 
*/ 
return docHei; 
}

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3. Finally, modify the height of the Iframe and use a timer to continuously check the height changes of the pages it contains.

function doReSize() 
{ 
var iframeWin = window.frames[&#39;ifrm&#39;]; 
var iframeEl = window.document.getElementById? window.document.getElementById(&#39;ifrm&#39;): document.all? document.all[&#39;ifrm&#39;]: null; 
if ( iframeEl && iframeWin ) 
{ 
var docHei = getDocHeight(iframeWin.document); 
if (docHei != iframeEl.style.height) iframeEl.style.height = docHei + &#39;px&#39;; 
} 
else if(iframeEl) 
{ 
var docHei = getDocHeight(iframeEl.contentDocument); 
if (docHei != iframeEl.style.height) iframeEl.style.height = docHei + &#39;px&#39;; 
} 
} 
function runResizeTask() 
{ 
doReSize(); 
setTimeout("runResizeTask()",500);//每隔半秒执行一次 
} 
runResizeTask();

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There is no need to consider whether the included pages are folded, hidden/shown!
Complete js code

<script language="javascript" type="text/javascript"> 
function getDocHeight(doc){ 
//在IE中doc.body.scrollHeight的可信度最高 
//在Firefox中，doc.height就可以了 
var docHei = 0; 
var scrollHei;//scrollHeight 
var offsetHei;//offsetHeight，包含了边框的高度 

if (doc.height){ 
//Firefox支持此属性，IE不支持 
docHei = doc.height; 
} 
else if (doc.body){ 
//在IE中，只有body.scrollHeight是与当前页面的高度一致的， 
//其他的跳转几次后就会变的混乱，不知道是依照什么取的值！ 
//似乎跟包含它的窗口的大小变化有关 
if(doc.body.offsetHeight) docHei = offsetHei = doc.body.offsetHeight; 
if(doc.body.scrollHeight) docHei = scrollHei = doc.body.scrollHeight; 
} 
else if(doc.documentElement){ 
if(doc.documentElement.offsetHeight) docHei = offsetHei = doc.documentElement.offsetHeight; 
if(doc.documentElement.scrollHeight) docHei = scrollHei = doc.documentElement.scrollHeight; 
} 
/* 
docHei = Math.max(scrollHei,offsetHei);//取最大的值，某些情况下可能与实际页面高度不符！ 
*/ 
return docHei; 
} 
function doReSize(){ 
var iframeWin = window.frames[&#39;Main&#39;]; 
var iframeEl = window.document.getElementById? window.document.getElementById(&#39;Main&#39;): document.all? document.all[&#39;Main&#39;]: null; 
if ( iframeEl && iframeWin ){ 
var docHei = getDocHeight(iframeWin.document); 
if (docHei != iframeEl.style.height) iframeEl.style.height = docHei + &#39;px&#39;; 
} 
else if(iframeEl){ 
var docHei = getDocHeight(iframeEl.contentDocument); 
if (docHei != iframeEl.style.height) iframeEl.style.height = docHei + &#39;px&#39;; 
} 
} 

function runResizeTask(){ 
doReSize(); 
setTimeout("runResizeTask()",1000);//每隔1秒执行一次 
} 
runResizeTask(); 
</script>

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