DOM parser: remove certain attributes only

问题

How can I use DOM parser to remove all attributes in span tags but except these two attributes,

cultura accept

heart accept

reject this,

May accept

Is it possible?

My working code from the other post I made,

$content = '
<span style="text-decoration: underline;">cultura</span>l <span style="text-decoration: line-through;">heart</span>
<span style="font-family: " lang="EN-US">May</span>
';

$dom = new DOMDocument();
$dom->loadHTML($content);

foreach( $dom->getElementsByTagName( "span" ) as $span )
{

    foreach( $span->attributes as $attrib )
    {
        $span->removeAttributeNode( $attrib );
    }


}

$content =  $dom->saveHTML();

But this code will remove all attributes inside the span tags...

回答1:

You need to do it manually.

DOM handles HTML attributes, not CSS properties.

You need to access the style attribute, explode it's value using ; as a delimiter, then loop the array looking for the value you want to unset.

回答2:

This is entirely possible with DOM only. DOM exposes a parsed version of the style attribute through the element.style property.

$('*').each(function() {
    var s = this.style;
    for (var i = s.length - 1; i >= 0; i--)
       if (s[i] != 'font-weight')
           s.removeProperty(s[i]);
});

The above code removes every style except font-weight.

This uses jQuery's $('*') to iterate over every element, but of course you can do it the hard way using just DOM.

Here's a JsFiddle to play with: http://jsfiddle.net/NbN3S/

One difficulty with this is that the names appear to be browser-dependent, unfortunately: for example, text-decoration is taken apart by Firefox into a bunch of -moz-* styles.

来源：https://stackoverflow.com/questions/6793224/dom-parser-remove-certain-attributes-only

标签

php

dom

html-parsing

domdocument