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Inconsistent Whitespace Text Nodes in Internet Explorer

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一生所求
一生所求 2020-12-09 22:03

The following source code alerts the following results:

Internet Explorer 7: 29
Firefox 3.0.3: 37 (correct)
Safari

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5条回答
  • 野性不改
    2020-12-09 22:17

    Zachleat, I think I've found a solution to the problem. (I've taken liberty of moving the form elements into the form tag.)

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<!--REF http://stackoverflow.com/questions/281443/inconsistent-whitespace-text-nodes-in-internet-explorer -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
    function countNodes()
    { alert(document.getElementsByTagName('form')[0].childNodes.length);
    };
</script>
</head>
<body onload="countNodes()">
  <form
    ><input type="submit"/
    ><input type="reset"/
    ><input type="button"/
    ><input type="text"/
    ><input type="password"/
    ><input type="file"/
    ><input type="hidden"/
    ><input type="checkbox"/
    ><input type="radio"/
    ><button></button
    ><select></select
    ><textarea></textarea
    ><div></div
    ><span></span
    ><table></table
    ><ul></ul
    ><a></a
  ></form>
</body>
</html>

    As you can see, I've split & strapped the closing gt (greater-than) brackets so they hug to the next tag, thus ensuring there are no ambiguous whitespaces.

    It was a nice surprise that it worked for all (4 desktop) browsers tried so far, all reporting the same number of DOM nodes.

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  • 轮回少年
    2020-12-09 22:24

    Well... I'd say the reason it that it is IE. I don't think the programers had a specific intention to do it that way.

    0 讨论(0)
  • 佛祖请我去吃肉
    2020-12-09 22:25

    IE tries to be helpful and hides text nodes that contain only whitespace.

    In the following:

    <p>
<input>
</p>

    W3C DOM spec says that <p> has 3 child nodes ("\n", <input> and "\n"), IE will pretend there's only one.

    The solution is to skip text nodes in all browsers:

    var node = element.firstChild;
while(node && node.nodeType == 3) node = node.nextSibling;

    Popular JS frameworks have functions for such things.

    0 讨论(0)
  • 清歌不尽
    2020-12-09 22:29

    I'm guessing that the table tag is different between browsers.

    e.g. which nodes does the default table auto-magically contain?

    <table>
  <thead>
  </thead>
  <tbody>
  </tbody>
  <tfoot>
  </tfoot>
</table>
    0 讨论(0)
  • 半阙折子戏
    2020-12-09 22:35

    Why not just try walking the DOM and see what each browser thinks that the document contains?

    IE does a lot of "optimization" of the DOM. To get an impression of what this might look like, "Select all", "Copy" in IE, and then "Paste Alternate" in Visual Studio, You get the following:

    <INPUT value="Submit Query" type=submit> 
<INPUT value=Reset type=reset> 
<INPUT type=button> 
<INPUT type=text> 
<INPUT value="" type=password> 
<INPUT type=file> 
<INPUT type=hidden>
<INPUT type=checkbox>
<INPUT type=radio>
<BUTTON type=submit></BUTTON> 
<SELECT></SELECT>
<TEXTAREA></TEXTAREA>

    So it nukes some of the empty tags and adds some default attributes.

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