javascript - Exists a way to let crawlers ignore parts of a document? -

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i aware can control documents crawler/spider can access robots.txt, meta tags, link attributes , on.

but in special case want portion of document being ignored. portion can not exist in iframe, "normal" content. <noscript> blocks amazing, mark partial content "don't index this, please."

  • first, thought using document.write() write out parts, learned assumption "spiders not execute javascript" seems wrong.
  • i thinking serving different version of page when detect crawler, not accurate, right?
  • also, can not put content on image.

are there tricks avoid getting specific part of document (not specific words spread around document) indexed?

[edit] know "if user agent in list of robots", don't idea. possibly there more agnostic approach. part suppressed contains dynamic content , whatever doing, has work "old" browsers ie6 :\

only difference between static content , dynamic content extension of file include:

var extension = "js"; // change "php" example load dynamic content function loadjs(filename){   var js=document.createelement('script')   js.setattribute("type","text/javascript")   js.setattribute("src", filename)   document.getelementsbytagname("head")[0].appendchild(js); } window.onload=function() {   loadjs("somecontenttoload."+extension); // hard crawlers read  }

in somecontenttoload.js:

document.getelementbyid("content").innerhtml="this static";

in somecontenttoload.php

<?php    header("content-type:text/javascript");   // load data database   $bla = .....;   ?>   document.getelementbyid("content").innerhtml="<? echo $bla; ?>";

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