hippietrail/travel-se-airport-tags.html

## travel-se-airport-tags.html
<html>
  <head>
    <title>Travel StackExchange / jQuery / Stack Exchange API / YQL / CORS</title>
    <script id="jqs" type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
    <style type="text/css">
        .container {
          width:100%;
        }
        .left {
          width:75%;
          float:left;
        }
        .right {
          width:25%;
          float:right;
        }
        .iata {
          color:blue
        }
        .tagwiki {
          color:red
        }
        .warn {
          background-color:yellow
        }
        .err {
          background-color:red
        }
        tt {
          font-weight:bold
        }
    </style>

    <script type="text/javascript">
      // TODO We don't know when everything is finished
      // TODO Need to track and match all queries with successes/failures

      // enable and/or play with this to test error handling code
      $.ajaxSetup({
        //timeout: 780
      });

      var outstanding_ajax = 0;
      var good_excerpt_total = 0;
      var no_excerpt_total = 0;
      var bad_excerpt_total = 0;
      var iata_total = 0;
      var bad_iata_total = 0;

      function do_stackexchange() {
        var maxpagesize = 100;
        var jqxhr2;

        $("#fourm input").prop("disabled", true);

        var pagecount;
        var remainder;

        // TODO include this in the loop instead of being an extra call before the loop
        jqxhr2 = $.getJSON("http://api.travel.stackexchange.com/1.1/tags?jsonp=?",
          { pagesize: 0 },
          function(data) {
            remainder = data.total % maxpagesize;
            pagecount = ( data.total - remainder ) / maxpagesize;
            pagecount += (remainder != 0);

            $("#tag-total").text(data.total);

            get_all_sx_3letter_tags(maxpagesize, pagecount);
          }
        )
        .error(function(jqXHR, textStatus, errorThrown) {
          $("<div/>").attr("class", "err").text("sx info < ERROR st: " + textStatus).prependTo("#debug");
        });

        //$("#fourm input").prop("disabled", false);
      }

      // request a batch of airport codes - asynchronous
      function do_airportcodes(page, codes) {
        // YQL supports CORS (but MSIE and Opera do not)
        var params = $.param(
          {
            // TODO ap: codes,
            q:      "select * from json where url in ("
                    + "select url from uritemplate where template=\""
                    + "http://airportcode.riobard.com/airport/{airport}?fmt=JSON"
                    + "\" and airport in ("
                    + $.map(codes, function(v){ return "\"" + v + "\""; }).join(",")
                    + "))",
            format: "json",
            diagnostics: "true"
          }/*,
          true      // jQuery.ajaxSettings.traditional*/
        );

        // TODO "http://query.yahooapis.com/v1/public/yql/peter/airports"
        var $url = "http://query.yahooapis.com/v1/public/yql";

        // if no CORS support then + "?callback=?"
        if (!$.support.cors) {
          $url += "?callback=?";
        }

        $("<div/>").text(++outstanding_ajax + " outstanding ajax (air)").prependTo("#debug");
        $("#os-ajax").text(outstanding_ajax);
        $.getJSON($url, params,
          function(data){
            var arr;

            // YQL JSON seems to be converted from XML so varies depending on how many results were returned. Normalize to an array.
            if (data.query.count > 1) {
              arr = data.query.results.json;
            } else {
              arr = [];
              if (data.query.count == 1) {
                arr[0] = data.query.results.json;
              }
            }

            var i = 0, j = 0, n = codes.length, m = data.query.count;

            while (i < n) {
              if (j < m && codes[i] === arr[j].code.toLowerCase()) {
                var docompare = false;

                var li = $("#" + codes[i]);

                if (li.has("div.tagwiki").length) {
                  docompare = true;
                }

                $("<div/>").attr("class", "iata").text(arr[j].name).appendTo(li);
                $("<div/>").attr("class", "iata").text(arr[j].location).appendTo(li);

                $("#iata-total").text(++iata_total);

                if (docompare) {
                  var name = arr[j].name;
                  var  loc = arr[j].location;
                  var both = name + " " + loc;
                  var   tw = li.children("div.tagwiki").text();

                  $("<div/>").text("name distance: " + levenshtein(tw, name) + " (wiki->iata)").appendTo(li);
                  $("<div/>").text(" loc distance: " + levenshtein(tw,  loc) + " (wiki->iata)").appendTo(li);
                  $("<div/>").text("both distance: " + levenshtein(tw, both) + " (wiki->iata)").appendTo(li);
                }

                j++;
              } else {
                $("<div/>").attr("class", "iata warn").text("Invalid IATA airport code").appendTo("#" + codes[i]);

                $("#bad-iata-total").text(++bad_iata_total);
              }
              i++;
            }
          }
        )
        .error(function(jqXHR, textStatus, errorThrown) {
          $.each(codes, function(i, code){
            $("<div/>").attr("class", "err").text("ac timeout").appendTo("#" + code);
          });
          $("<div/>").attr("class", "err").text("air < ERROR st: " + textStatus + " : " + codes).prependTo("#debug");
        })
        .complete(function(jqXHR, textStatus, errorThrown) {
          $("<div/>").text(--outstanding_ajax + " outstanding ajax (air)").prependTo("#debug");
          $("#os-ajax").text(outstanding_ajax);
        });
      }

      // request a batch of tag wikis - asynchronous
      function do_tagwikis(page, codes) {
        // Stack Exchange doesn't support CORS, use JSONP
        $("<div/>").text(++outstanding_ajax + " outstanding ajax (tw)").prependTo("#debug");
        $("#os-ajax").text(outstanding_ajax);
        $.getJSON("http://api.travel.stackexchange.com/1.1/tags/" + codes.join(";") + "/wikis?jsonp=?",

          // success callback
          function(data){
            $.each(data.tag_wikis, function(i, ele){
              var classes = "tagwiki";
              if (ele.wiki_excerpt.toLowerCase().indexOf("air") == -1) {
                classes += " warn";

                $("#bad-excerpt-total").text(++bad_excerpt_total);
              } else {
                $("#excerpt-total").text(++good_excerpt_total);
              }

              var docompare = false;

              var li = $("#" + ele.tag_name);

              if (li.has("div.iata").length) {
                docompare = true;
              }

              $("<div/>").attr("class", classes).text(ele.wiki_excerpt).appendTo(li);

              if (docompare) {
                var name = li.children("div.iata").eq(0).text();
                var  loc = li.children("div.iata").eq(1).text();
                var both = name + " " + loc;
                var   tw = ele.wiki_excerpt;

                $("<div/>").text("name distance: " + levenshtein(tw, name) + " (iata->wiki)").appendTo(li);
                $("<div/>").text(" loc distance: " + levenshtein(tw,  loc) + " (iata->wiki)").appendTo(li);
                $("<div/>").text("both distance: " + levenshtein(tw, both) + " (iata->wiki)").appendTo(li);
              }
            });

            // we got back fewer results than we passed in: some had no tag wiki
            // TODO it's possible to get the right number of results because a tag wiki exists but has no excerpt!

            // convert "data.tag_wikis" to a "map"
            var map = {};
            $.each(data.tag_wikis, function(i, tag){
              map[tag.tag_name] = i; // could set to anything
            });

            // for each "codes" if it's not in map emit a warning that the code has no tag wiki
            $.each(codes, function(i, code) {
              if (!(code in map)) {
                $("<div/>").attr("class", "tagwiki warn").text("There's no tag wiki excerpt for this code").appendTo("#" + codes[i]);

                $("#no-excerpt-total").text(++no_excerpt_total);
              }
            });
          }
        )
        .error(function(jqXHR, textStatus, errorThrown) {
          $.each(codes, function(i, code){
            $("<div/>").attr("class", "err").text("tw timeout").appendTo("#" + code);
          });
          $("<div/>").attr("class", "err").text("tw < ERROR st: " + textStatus).prependTo("#debug");
        })
        .complete(function(jqXHR, textStatus, errorThrown) {
          $("<div/>").text(--outstanding_ajax + " outstanding ajax (tw)").prependTo("#debug");
          $("#os-ajax").text(outstanding_ajax);
        });
      }

      /////////////////////////////////////////////////////////////////////////////////////

      // Helper function for get_all_sx_3letter_tags()
      function tagPageFailed(page) {
        return function(jqXHR, textStatus, errorThrown) {
          $("<div/>").attr("class", "err").text("sx page > p" + page + " ERROR st: " + textStatus).prependTo("#debug");
        };
      }

      function get_all_sx_3letter_tags(maxpagesize, pagecount) {
        var three_tag_count = 0;

        for (var p = 1; p <= pagecount; p++) {
          $("<div/>").text(++outstanding_ajax + " outstanding ajax (sx)").prependTo("#debug");
          $("#os-ajax").text(outstanding_ajax);
          // Stack Exchange doesn't support CORS, use JSONP
          $.getJSON("http://api.travel.stackexchange.com/1.1/tags?jsonp=?",
            {
              page:     p,
              pagesize: maxpagesize
            },
            function(data) {
              if (data.error) {
                $("<div/>").text("sx < ? success data error").prependTo("#debug");
              } else {
                var remainder = data.total % maxpagesize;
                var pagecount = ( data.total - remainder ) / maxpagesize;

                var codes = [];

                $.each(data.tags, function(i, tag){
                  if (tag.name.match(/^[a-z][a-z][a-z]$/)) {
                    three_tag_count++;
                    $("#3l-tag-total").text(three_tag_count);

                    // maintain this list in order using binary search

                    var ol = $("#output");
                    var needle = tag.name;
                    var high = ol.children("li").length;
                    var low = 0;
                    var mid;
                    var id;

                    while (low < high) {
                      mid = parseInt((low + high) / 2)
                      id = $("ol#output li:nth-child(" + (mid+1) + ")").attr('id');
                      if (needle < id) {
                        high = mid;
                      } else {
                        low = mid + 1;
                      }
                    }

                    id = $("ol#output li:nth-child(" + (low+1) + ")").attr('id');

                    var li = $("<li id=\"" + tag.name + "\"><tt>" + tag.name.toUpperCase() + "</tt><sup>" + tag.count + "</sup></li>");

                    if (typeof id == "undefined") {
                      li.appendTo("#output");
                    } else {
                      li.insertBefore("#" + id);
                    }

                    codes.push(tag.name);
                  }
                });

                $("<div/>").text(codes.length + " 3-letter tags in page " + p).prependTo("#debug");
                if (codes.length == 0) {
                  $("<div/>").text("no 3-letter tags in page " + p).prependTo("#debug");
                } else {
                  do_airportcodes(data.page, codes);
                  do_tagwikis(data.page, codes);
                }
              }
            }
          )
          .error(tagPageFailed(p))
          .complete(function(jqXHR, textStatus) {
            $("<div/>").text(--outstanding_ajax + " outstanding ajax (sx)").prependTo("#debug");
            $("#os-ajax").text(outstanding_ajax);
          });
        }
        $("<div/>").text("all ajax sent (sx)").prependTo("#debug");
      }

      $(document).ready(function(){
        // initialize stuff

        if ($.support.cors) {
          $("<div/>").text("browser supports CORS").prependTo("#debug");
        } else {
          $("<div/>").attr("class", "err").text("browser does not support CORS").prependTo("#debug");
        }

        // add functions to the gui buttons
        $("#stackexchange").click(function(){ do_stackexchange() });

        // enable the form controls now that init is done
        $("#fourm input").prop("disabled", false);
      });

      function levenshtein (s1, s2) {
          // Calculate Levenshtein distance between two strings
          //
          // version: 1109.2015
          // discuss at: http://phpjs.org/functions/levenshtein
          // +            original by: Carlos R. L. Rodrigues (http://www.jsfromhell.com)
          // +            bugfixed by: Onno Marsman
          // +             revised by: Andrea Giammarchi (http://webreflection.blogspot.com)
          // + reimplemented by: Brett Zamir (http://brett-zamir.me)
          // + reimplemented by: Alexander M Beedie
          // *                example 1: levenshtein('Kevin van Zonneveld', 'Kevin van Sommeveld');
          // *                returns 1: 3
          if (s1 == s2) {
              return 0;
          }

          var s1_len = s1.length;
          var s2_len = s2.length;
          if (s1_len === 0) {
              return s2_len;
          }
          if (s2_len === 0) {
              return s1_len;
          }

          // BEGIN STATIC
          var split = false;
          try {
              split = !('0')[0];
          } catch (e) {
              split = true; // Earlier IE may not support access by string index
          }
          // END STATIC
          if (split) {
              s1 = s1.split('');
              s2 = s2.split('');
          }

          var v0 = new Array(s1_len + 1);
          var v1 = new Array(s1_len + 1);

          var s1_idx = 0,
              s2_idx = 0,
              cost = 0;
          for (s1_idx = 0; s1_idx < s1_len + 1; s1_idx++) {
              v0[s1_idx] = s1_idx;
          }
          var char_s1 = '',
              char_s2 = '';
          for (s2_idx = 1; s2_idx <= s2_len; s2_idx++) {
              v1[0] = s2_idx;
              char_s2 = s2[s2_idx - 1];

              for (s1_idx = 0; s1_idx < s1_len; s1_idx++) {
                  char_s1 = s1[s1_idx];
                  cost = (char_s1 == char_s2) ? 0 : 1;
                  var m_min = v0[s1_idx + 1] + 1;
                  var b = v1[s1_idx] + 1;
                  var c = v0[s1_idx] + cost;
                  if (b < m_min) {
                      m_min = b;
                  }
                  if (c < m_min) {
                      m_min = c;
                  }
                  v1[s1_idx + 1] = m_min;
              }
              var v_tmp = v0;
              v0 = v1;
              v1 = v_tmp;
          }
          return v0[s1_len];
      }

    </script>
  </head>
  <body>
    Travel Stack Exchange airport code tag verification tool

    <hr>

    <form id="fourm">
      <input type="button" disabled="true" id="stackexchange" value="Check Travel Stack Exchange 3-letter tags"></input>
      Total number of tags: <span id="tag-total">?</span>.
      <!-- number of tags scanned -->
      Number of 3-letter tags: <span id="3l-tag-total">?</span>
      Number with good wiki excerpt: <span id="excerpt-total">?</span>
      Number with bad wiki excerpt: <span id="bad-excerpt-total">?</span>
      Number with no wiki excerpt: <span id="no-excerpt-total">?</span>
      Number of valid IATA airport codes: <span id="iata-total">?</span>
      Number of invalid IATA airport codes: <span id="bad-iata-total">?</span>
      (Outstanding AJAX requests: <span id="os-ajax">?</span>)
    </form>

    <hr>
    <div class="container">

      <div class="left">
        Output<hr>
        <ol id="output"/>
      </div>

      <div class="right">
        Debugging<hr>
        <div id="debug"></div>
      </div>
    </div>

  </body>
</html>
	<html>
	<head>
	<title>Travel StackExchange / jQuery / Stack Exchange API / YQL / CORS</title>
	<script id="jqs" type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
	<style type="text/css">
	.container {
	width:100%;
	}
	.left {
	width:75%;
	float:left;
	}
	.right {
	width:25%;
	float:right;
	}
	.iata {
	color:blue
	}
	.tagwiki {
	color:red
	}
	.warn {
	background-color:yellow
	}
	.err {
	background-color:red
	}
	tt {
	font-weight:bold
	}
	</style>

	<script type="text/javascript">
	// TODO We don't know when everything is finished
	// TODO Need to track and match all queries with successes/failures

	// enable and/or play with this to test error handling code
	$.ajaxSetup({
	//timeout: 780
	});

	var outstanding_ajax = 0;
	var good_excerpt_total = 0;
	var no_excerpt_total = 0;
	var bad_excerpt_total = 0;
	var iata_total = 0;
	var bad_iata_total = 0;

	function do_stackexchange() {
	var maxpagesize = 100;
	var jqxhr2;

	$("#fourm input").prop("disabled", true);

	var pagecount;
	var remainder;

	// TODO include this in the loop instead of being an extra call before the loop
	jqxhr2 = $.getJSON("http://api.travel.stackexchange.com/1.1/tags?jsonp=?",
	{ pagesize: 0 },
	function(data) {
	remainder = data.total % maxpagesize;
	pagecount = ( data.total - remainder ) / maxpagesize;
	pagecount += (remainder != 0);

	$("#tag-total").text(data.total);

	get_all_sx_3letter_tags(maxpagesize, pagecount);
	}
	)
	.error(function(jqXHR, textStatus, errorThrown) {
	$("<div/>").attr("class", "err").text("sx info < ERROR st: " + textStatus).prependTo("#debug");
	});

	//$("#fourm input").prop("disabled", false);
	}

	// request a batch of airport codes - asynchronous
	function do_airportcodes(page, codes) {
	// YQL supports CORS (but MSIE and Opera do not)
	var params = $.param(
	{
	// TODO ap: codes,
	q: "select * from json where url in ("
	+ "select url from uritemplate where template=\""
	+ "http://airportcode.riobard.com/airport/{airport}?fmt=JSON"
	+ "\" and airport in ("
	+ $.map(codes, function(v){ return "\"" + v + "\""; }).join(",")
	+ "))",
	format: "json",
	diagnostics: "true"
	}/*,
	true // jQuery.ajaxSettings.traditional*/
	);

	// TODO "http://query.yahooapis.com/v1/public/yql/peter/airports"
	var $url = "http://query.yahooapis.com/v1/public/yql";

	// if no CORS support then + "?callback=?"
	if (!$.support.cors) {
	$url += "?callback=?";
	}

	$("<div/>").text(++outstanding_ajax + " outstanding ajax (air)").prependTo("#debug");
	$("#os-ajax").text(outstanding_ajax);
	$.getJSON($url, params,
	function(data){
	var arr;

	// YQL JSON seems to be converted from XML so varies depending on how many results were returned. Normalize to an array.
	if (data.query.count > 1) {
	arr = data.query.results.json;
	} else {
	arr = [];
	if (data.query.count == 1) {
	arr[0] = data.query.results.json;
	}
	}

	var i = 0, j = 0, n = codes.length, m = data.query.count;

	while (i < n) {
	if (j < m && codes[i] === arr[j].code.toLowerCase()) {
	var docompare = false;

	var li = $("#" + codes[i]);

	if (li.has("div.tagwiki").length) {
	docompare = true;
	}

	$("<div/>").attr("class", "iata").text(arr[j].name).appendTo(li);
	$("<div/>").attr("class", "iata").text(arr[j].location).appendTo(li);

	$("#iata-total").text(++iata_total);

	if (docompare) {
	var name = arr[j].name;
	var loc = arr[j].location;
	var both = name + " " + loc;
	var tw = li.children("div.tagwiki").text();

	$("<div/>").text("name distance: " + levenshtein(tw, name) + " (wiki->iata)").appendTo(li);
	$("<div/>").text(" loc distance: " + levenshtein(tw, loc) + " (wiki->iata)").appendTo(li);
	$("<div/>").text("both distance: " + levenshtein(tw, both) + " (wiki->iata)").appendTo(li);
	}

	j++;
	} else {
	$("<div/>").attr("class", "iata warn").text("Invalid IATA airport code").appendTo("#" + codes[i]);

	$("#bad-iata-total").text(++bad_iata_total);
	}
	i++;
	}
	}
	)
	.error(function(jqXHR, textStatus, errorThrown) {
	$.each(codes, function(i, code){
	$("<div/>").attr("class", "err").text("ac timeout").appendTo("#" + code);
	});
	$("<div/>").attr("class", "err").text("air < ERROR st: " + textStatus + " : " + codes).prependTo("#debug");
	})
	.complete(function(jqXHR, textStatus, errorThrown) {
	$("<div/>").text(--outstanding_ajax + " outstanding ajax (air)").prependTo("#debug");
	$("#os-ajax").text(outstanding_ajax);
	});
	}

	// request a batch of tag wikis - asynchronous
	function do_tagwikis(page, codes) {
	// Stack Exchange doesn't support CORS, use JSONP
	$("<div/>").text(++outstanding_ajax + " outstanding ajax (tw)").prependTo("#debug");
	$("#os-ajax").text(outstanding_ajax);
	$.getJSON("http://api.travel.stackexchange.com/1.1/tags/" + codes.join(";") + "/wikis?jsonp=?",

	// success callback
	function(data){
	$.each(data.tag_wikis, function(i, ele){
	var classes = "tagwiki";
	if (ele.wiki_excerpt.toLowerCase().indexOf("air") == -1) {
	classes += " warn";

	$("#bad-excerpt-total").text(++bad_excerpt_total);
	} else {
	$("#excerpt-total").text(++good_excerpt_total);
	}

	var docompare = false;

	var li = $("#" + ele.tag_name);

	if (li.has("div.iata").length) {
	docompare = true;
	}

	$("<div/>").attr("class", classes).text(ele.wiki_excerpt).appendTo(li);

	if (docompare) {
	var name = li.children("div.iata").eq(0).text();
	var loc = li.children("div.iata").eq(1).text();
	var both = name + " " + loc;
	var tw = ele.wiki_excerpt;

	$("<div/>").text("name distance: " + levenshtein(tw, name) + " (iata->wiki)").appendTo(li);
	$("<div/>").text(" loc distance: " + levenshtein(tw, loc) + " (iata->wiki)").appendTo(li);
	$("<div/>").text("both distance: " + levenshtein(tw, both) + " (iata->wiki)").appendTo(li);
	}
	});

	// we got back fewer results than we passed in: some had no tag wiki
	// TODO it's possible to get the right number of results because a tag wiki exists but has no excerpt!

	// convert "data.tag_wikis" to a "map"
	var map = {};
	$.each(data.tag_wikis, function(i, tag){
	map[tag.tag_name] = i; // could set to anything
	});

	// for each "codes" if it's not in map emit a warning that the code has no tag wiki
	$.each(codes, function(i, code) {
	if (!(code in map)) {
	$("<div/>").attr("class", "tagwiki warn").text("There's no tag wiki excerpt for this code").appendTo("#" + codes[i]);

	$("#no-excerpt-total").text(++no_excerpt_total);
	}
	});
	}
	)
	.error(function(jqXHR, textStatus, errorThrown) {
	$.each(codes, function(i, code){
	$("<div/>").attr("class", "err").text("tw timeout").appendTo("#" + code);
	});
	$("<div/>").attr("class", "err").text("tw < ERROR st: " + textStatus).prependTo("#debug");
	})
	.complete(function(jqXHR, textStatus, errorThrown) {
	$("<div/>").text(--outstanding_ajax + " outstanding ajax (tw)").prependTo("#debug");
	$("#os-ajax").text(outstanding_ajax);
	});
	}

	/////////////////////////////////////////////////////////////////////////////////////

	// Helper function for get_all_sx_3letter_tags()
	function tagPageFailed(page) {
	return function(jqXHR, textStatus, errorThrown) {
	$("<div/>").attr("class", "err").text("sx page > p" + page + " ERROR st: " + textStatus).prependTo("#debug");
	};
	}

	function get_all_sx_3letter_tags(maxpagesize, pagecount) {
	var three_tag_count = 0;

	for (var p = 1; p <= pagecount; p++) {
	$("<div/>").text(++outstanding_ajax + " outstanding ajax (sx)").prependTo("#debug");
	$("#os-ajax").text(outstanding_ajax);
	// Stack Exchange doesn't support CORS, use JSONP
	$.getJSON("http://api.travel.stackexchange.com/1.1/tags?jsonp=?",
	{
	page: p,
	pagesize: maxpagesize
	},
	function(data) {
	if (data.error) {
	$("<div/>").text("sx < ? success data error").prependTo("#debug");
	} else {
	var remainder = data.total % maxpagesize;
	var pagecount = ( data.total - remainder ) / maxpagesize;

	var codes = [];

	$.each(data.tags, function(i, tag){
	if (tag.name.match(/^[a-z][a-z][a-z]$/)) {
	three_tag_count++;
	$("#3l-tag-total").text(three_tag_count);

	// maintain this list in order using binary search

	var ol = $("#output");
	var needle = tag.name;
	var high = ol.children("li").length;
	var low = 0;
	var mid;
	var id;

	while (low < high) {
	mid = parseInt((low + high) / 2)
	id = $("ol#output li:nth-child(" + (mid+1) + ")").attr('id');
	if (needle < id) {
	high = mid;
	} else {
	low = mid + 1;
	}
	}

	id = $("ol#output li:nth-child(" + (low+1) + ")").attr('id');

	var li = $("<li id=\"" + tag.name + "\"><tt>" + tag.name.toUpperCase() + "</tt><sup>" + tag.count + "</sup></li>");

	if (typeof id == "undefined") {
	li.appendTo("#output");
	} else {
	li.insertBefore("#" + id);
	}

	codes.push(tag.name);
	}
	});

	$("<div/>").text(codes.length + " 3-letter tags in page " + p).prependTo("#debug");
	if (codes.length == 0) {
	$("<div/>").text("no 3-letter tags in page " + p).prependTo("#debug");
	} else {
	do_airportcodes(data.page, codes);
	do_tagwikis(data.page, codes);
	}
	}
	}
	)
	.error(tagPageFailed(p))
	.complete(function(jqXHR, textStatus) {
	$("<div/>").text(--outstanding_ajax + " outstanding ajax (sx)").prependTo("#debug");
	$("#os-ajax").text(outstanding_ajax);
	});
	}
	$("<div/>").text("all ajax sent (sx)").prependTo("#debug");
	}

	$(document).ready(function(){
	// initialize stuff

	if ($.support.cors) {
	$("<div/>").text("browser supports CORS").prependTo("#debug");
	} else {
	$("<div/>").attr("class", "err").text("browser does not support CORS").prependTo("#debug");
	}

	// add functions to the gui buttons
	$("#stackexchange").click(function(){ do_stackexchange() });

	// enable the form controls now that init is done
	$("#fourm input").prop("disabled", false);
	});

	function levenshtein (s1, s2) {
	// Calculate Levenshtein distance between two strings
	//
	// version: 1109.2015
	// discuss at: http://phpjs.org/functions/levenshtein
	// + original by: Carlos R. L. Rodrigues (http://www.jsfromhell.com)
	// + bugfixed by: Onno Marsman
	// + revised by: Andrea Giammarchi (http://webreflection.blogspot.com)
	// + reimplemented by: Brett Zamir (http://brett-zamir.me)
	// + reimplemented by: Alexander M Beedie
	// * example 1: levenshtein('Kevin van Zonneveld', 'Kevin van Sommeveld');
	// * returns 1: 3
	if (s1 == s2) {
	return 0;
	}

	var s1_len = s1.length;
	var s2_len = s2.length;
	if (s1_len === 0) {
	return s2_len;
	}
	if (s2_len === 0) {
	return s1_len;
	}

	// BEGIN STATIC
	var split = false;
	try {
	split = !('0')[0];
	} catch (e) {
	split = true; // Earlier IE may not support access by string index
	}
	// END STATIC
	if (split) {
	s1 = s1.split('');
	s2 = s2.split('');
	}

	var v0 = new Array(s1_len + 1);
	var v1 = new Array(s1_len + 1);

	var s1_idx = 0,
	s2_idx = 0,
	cost = 0;
	for (s1_idx = 0; s1_idx < s1_len + 1; s1_idx++) {
	v0[s1_idx] = s1_idx;
	}
	var char_s1 = '',
	char_s2 = '';
	for (s2_idx = 1; s2_idx <= s2_len; s2_idx++) {
	v1[0] = s2_idx;
	char_s2 = s2[s2_idx - 1];

	for (s1_idx = 0; s1_idx < s1_len; s1_idx++) {
	char_s1 = s1[s1_idx];
	cost = (char_s1 == char_s2) ? 0 : 1;
	var m_min = v0[s1_idx + 1] + 1;
	var b = v1[s1_idx] + 1;
	var c = v0[s1_idx] + cost;
	if (b < m_min) {
	m_min = b;
	}
	if (c < m_min) {
	m_min = c;
	}
	v1[s1_idx + 1] = m_min;
	}
	var v_tmp = v0;
	v0 = v1;
	v1 = v_tmp;
	}
	return v0[s1_len];
	}

	</script>
	</head>
	<body>
	Travel Stack Exchange airport code tag verification tool

	<hr>

	<form id="fourm">
	<input type="button" disabled="true" id="stackexchange" value="Check Travel Stack Exchange 3-letter tags"></input>
	Total number of tags: <span id="tag-total">?</span>.
	<!-- number of tags scanned -->
	Number of 3-letter tags: <span id="3l-tag-total">?</span>
	Number with good wiki excerpt: <span id="excerpt-total">?</span>
	Number with bad wiki excerpt: <span id="bad-excerpt-total">?</span>
	Number with no wiki excerpt: <span id="no-excerpt-total">?</span>
	Number of valid IATA airport codes: <span id="iata-total">?</span>
	Number of invalid IATA airport codes: <span id="bad-iata-total">?</span>
	(Outstanding AJAX requests: <span id="os-ajax">?</span>)
	</form>

	<hr>
	<div class="container">

	<div class="left">
	Output<hr>
	<ol id="output"/>
	</div>

	<div class="right">
	Debugging<hr>
	<div id="debug"></div>
	</div>
	</div>

	</body>
	</html>