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JS code reports an error in ie8 that document.getElementById(...) is empty or not an object. Solution

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PHP中文网Original
2016-05-16 18:40:581764browse

IE8 is more strict about declaring document types, as shown in the following code. 

<input type=&#39;text&#39; name=&#39;os&#39; value=&#39;Windows平台&#39; style=&#39;width:100px&#39; /> 
<script type="text/javascript"> 
                function osdo(str){ 
                document.getElementById("os").value=str; 
                } 
                </script> 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;&#39;)" />清空 
<input name="ostmp" type="radio" value="Windows平台" onclick="osdo(&#39;Windows平台&#39;)" /> 
Windows平台 <input name="ostmp" type="radio" value="" onclick="osdo(&#39;S60v2&#39;)" />S60v2 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;S60v3&#39;)" />S60v3 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;CHM&#39;)" />CHM 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;PDF&#39;)" />PDF 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;PPT&#39;)" />PPT 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;DOC&#39;)" />WORD 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;EXCEL&#39;)" />EXCEL
 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp&#39;)" />asp 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp+access&#39;)" />asp+access 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp+sqlserver&#39;)" />asp+sqlserver 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp+sql/access&#39;)" /> 
asp+sql/access <strong>php源码</strong> 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;php&#39;)" />php 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;php+mysql&#39;)" /> 
php+mysql<input name="ostmp" type="radio" value="" onclick="osdo(&#39;jsp&#39;)" />jsp <strong>asp.net源码</strong> 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp.net&#39;)" />asp.net 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp.net+access&#39;)" />asp.net+access 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp.net+sql&#39;)" />asp.net+sql 
<input name="ostmp" type="radio" value="" onclick="osdo(&#39;asp.net+sql/access&#39;)" />asp.net+sql/access

You can see that this code can run in both ie7 and ie8. We add the declaration document to the following code 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

and add the above document type declaration. 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
运行环境： 
 

 
清空 
 
Windows平台 S60v2 
S60v3 
CHM 
PDF 
PPT 
WORD 
EXCEL
 
asp 
asp+access 
asp+sqlserver 
 
asp+sql/access php源码 
php 
 
php+mysqljsp asp.net源码 
asp.net 
asp.net+access 
asp.net+sql 
asp.net+sql/access

The solution is found when the prompt document.getElementById(...) is empty or not an object
If there is a document declaration in the page, because when using div css layout, the document is not declared. , some parts of the page are different.
You can add the following code in the head

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />

Complete code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> 
运行环境： 
 

 
清空 
 
Windows平台 S60v2 
S60v3 
CHM 
PDF 
PPT 
WORD 
EXCEL
 
asp 
asp+access 
asp+sqlserver 
 
asp+sql/access php源码 
php 
 
php+mysqljsp asp.net源码 
asp.net 
asp.net+access 
asp.net+sql 
asp.net+sql/access


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