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Message-ID: <8973725.hmDRQCkskN@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Sun, 03 Feb 2013 02:03:49 +0100
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Subject: Re: <span> text replacement ??
Newsgroups: comp.lang.javascript
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Andrew Poulos wrote:

> On 3/02/2013 8:10 AM, Jukka K. Korpela wrote:
>> 2013-02-02 22:41, Mel Smith wrote:
>>>      I wish to change the textual content of the following <span>
>>> element.
>>>
>>>      <span id="ierrmsg">This is original error msg</span>
>>>
>>>      I have tried document.getElementById("ierrmsg").value ="new error
>>> msg" ;
>>>
>>>      .. and I've also tried to do .nodeValue,  .text, etc.
>>
>> Normal elements don’t have such properties.

Nonsense.

>> The practical choice is the innerHTML property:
>> document.getElementById("ierrmsg").innerHTML = "new msg" ;
> 
> or
> 
> document.getElementById("ierrmsg").firstChild.nodeValue = "new msg";
> 
> should also work. Of course the element would have to exist before you
> can apply any change to it.

Neither the “innerHTML” property nor the “nodeValue” property of the first 
text child node are usually equivalent to the *text* content of the 
corresponding element.  Per W3C DOM Level 3 Core, all elements have a 
“textContent” property that can be read from and assigned to.

  document.getElementById("ierrmsg").textContent = "new msg";

It is supported by many DOM implementations, but not MSHTML < 9.  For the 
latter, you need to remove all child nodes and create a new text child node:

  if (typeof el.textContent != "undefined")
  {
    el.textContent = text;
  }
  else
  {
    while (el.lastChild) el.removeChild(el.lastChild);
    el.appendChild(document.createTextNode(text));
  }

See also jsx.dom.setTextContent().

An assignment to the “innerHTML” property is not equivalent to that because 
there the value right-hand side will be parsed, and the property is not 
available in XML mode.

<http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-textContent>
<https://developer.mozilla.org/en-US/docs/DOM/Node.textContent>
<http://msdn.microsoft.com/en-us/library/ff974773.aspx>

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.