JavaScript Site Search

There is not enough room here to show all the code of the search routine so the description below is just the bare outline of the routine.

Arrays

The search works by scanning through an array of keywords in a JavaScript file. There are in fact five parallel arrays defined as follows:

// Number of matches found on this page
aHits = new Array();
// The keywords for each page
aKeyWord = new Array();
// The URL of each page
aURL = new Array();
// Page array sorted by number of hits
aSorted = new Array();
// Description of each page
aTitle = new Array();

The FoxPro code which builds the site parses each HTML document and pulls words from the Keyword and Description attributes to populate the arrays. These are the array members for the current page:

aURL[87]='foxsearch.htm';
aTitle[87]='Search page for Alvechurch Data web site';
aKeyWord[87]='alvechurch, data, search, find, javascript';
aHits[87]=0;

Although the aTitle and aKeyword arrays are similar for many pages, they have to be kept separate because the string comparison is case-sensitive in JavaScript. The algorithm searches aKeyword but displays the equivalent entry from aTitle.

Searching the Arrays

// Get the search target in lower case
lcTarget = document.searchForm.searchFor.value.toLowerCase()

// Zero the hit counter and empty the array
// of hits

lnFound = 0
for (thisPage=1; thisPage < aKeyWord.length; thisPage++)
  {
  aHits[thisPage] = 0
  }
// Break the target into an array of individual
// words then scan through the keyword array once
// for each of these words looking for a match.

laWords=lcTarget.split(" ")
for (lnWord = 0; lnWord < laWords.length; lnWord++)
  {
  for (thisPage=1; thisPage < aKeyWord.length;
       thisPage++)
   {
   if(laWords[lnWord] == "")
    {
    // Do nothing - this is a rogue thrown up by
    // the split operation.

    }
   else
    {
    if (aKeyWord[thisPage].indexOf(laWords[lnWord]) > -1)
     {
     aHits[thisPage]++;
     if(aHits[thisPage]==1)
      {
      // First word found on the page so record
      // that the search has a hit.

      lnFound++;
      }
     }
    }
   }
  }
  // Write the results or an apology in the
  // centre of this page.

  if (lnFound==0)
   {
   writeResult(loPlaceHolder,
     "No pages include '" + lcTarget + "'");
   }
  else
   {
   // We've found some pages
   writeResult(loPlaceHolder, lnFound +
    " pages found.");
   showResults(loPlaceHolder, lnFound, lcTarget)
   lnFound=0;
   }
  }
return false

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