User agents

rcusr · Jul 4, 2003

Hi all,

Is it possible to create a user agent in JavaScript. i.e. something that would cycle through the flat page content to check for certain snippets of code?

If so how would I go about setting something like that up?
Thanks,

Richard

dwarfthrower · Jul 6, 2003

Probably easier to open the file in notepad and use the search facility. But otherwise it's fairly easy to check for one string inside another:

Code:

<script>
function findcode(codeToFind){
  codeToFind=codeToFind.toLowerCase()
  var searchThisString = document.documentElement.innerHTML.toLowerCase();
  var numOccurrences = 0;
  var currPos = 0;
  while(currPos >= 0){
    currPos = searchThisString.indexOf(codeToFind, currPos);
    if(currPos >= 0){
      numOccurrences++;
    }
  }
  alert('Found ' + numOccurrences + ' of the string &quot;' + codeToFind);
}

rcusr · Jul 7, 2003

Hi,

Thnaks for the reply... I've set up the script but I think I may have done something wrong as it maxs out my CPU and crashes my IE. Here's the pages code:

<html>
<head>
<title>Find Something</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language="JavaScript">
function findcode(codeToFind){
codeToFind=codeToFind.toLowerCase();
var searchThisString = document.documentElement.innerHTML.toLowerCase();
var numOccurrences = 0;
var currPos = 0;
while(currPos >= 0){
currPos = searchThisString.indexOf(codeToFind, currPos);
if(currPos >= 0){
numOccurrences++;
}
}
alert('Found ' + numOccurrences + ' of the string "' + codeToFind);
}

</script>
</head>

<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><a href="#" onClick="findcode('table')">look</a></td>
</tr>
<tr>
<td> </td>
</tr>
</table>
</td>
</tr>
<tr>
<td> </td>
</tr>
</table>

</body>
</html>

+++++++++++++++++++
Can you see what I've done wrong?
Thanks,

Richard

dwarfthrower · Jul 7, 2003

More what I did wrong to begin with... The currPos variable never gets set high enough to find the second occurence of the search string. It just keeps looking for it in the last place it found it.

This one works:

Code:

<html>
<head>
<title>Find Something</title>
<meta http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=iso-8859-1&quot;>
<script language=&quot;JavaScript&quot;>
function findcode(codeToFind){
  codeToFind=codeToFind.toLowerCase();
  var searchThisString = document.documentElement.innerHTML.toLowerCase();
  var numOccurrences = 0;
  var currPos = 0;
  var result = 0;
  while(result >= 0){
    result = searchThisString.indexOf(codeToFind, currPos);
	currPos = result + 1;
	alert(currPos);
    if(currPos >= 0){
      numOccurrences++;
    }
	
  }
  alert('Found ' + numOccurrences + ' of the string &quot;' + codeToFind);
}

</script>
</head>

<body>
<table width=&quot;100%&quot; border=&quot;0&quot; cellspacing=&quot;0&quot; cellpadding=&quot;0&quot;>
  <tr>
    <td><table width=&quot;100%&quot; border=&quot;0&quot; cellspacing=&quot;0&quot; cellpadding=&quot;0&quot;>
  <tr>
    <td><a href=&quot;#&quot; onClick=&quot;findcode('table')&quot;>look</a></td>
  </tr>
  <tr>
    <td> </td>
  </tr>
</table>
</td>
  </tr>
  <tr>
    <td> </td>
  </tr>
</table>



</body>
</html>

rcusr · Jul 8, 2003

That works perfectly... thanks very much!

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