XML Reference Guide

Mar 14, 2003

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Get the center location

...
   url = url + "&filter=1&latlong=1";

   getJobs(url);
   getCenter(theForm.elements["l"].value);

}

var targetLong = null;
var targetLat = null;

function getJobs(theUrl){
   
   jobsResponse = "";
   jobsDone = false;

   var request = GXmlHttp.create();
   request.open('GET', 'proxy.php?url='+URLencode(theUrl), true);
   request.onreadystatechange = function() {
     if (request.readyState == 4) {
         var jobDoc = GXml.parse(request.responseText);
	   displayJobs(jobDoc);

     }
   };
   request.send(null);
}

function getCenter(theZip){

   var request = GXmlHttp.create();
   request.open('GET', 'proxy.php?url='+URLencode('http://geocoder.us/service/csv/geocode?zip='+theZip), true);
   request.onreadystatechange = function() {
     if (request.readyState == 4) {

        //Do something

     }
   };
   request.send(null);
}


function displayJobs(jobDoc){
   var jobsElement = jobDoc.documentElement.getElementsByTagName("results").item(0);
...

1 Coordinating responses

...
var targetLong = null;
var targetLat = null;

var jobsResponse = "";
var jobsDone = false;

function getJobs(theUrl){
   
   jobsResponse = "";
   jobsDone = false;

   var request = GXmlHttp.create();
   request.open('GET', 'proxy.php?url='+URLencode(theUrl), true);
   request.onreadystatechange = function() {
     if (request.readyState == 4) {
         jobsResponse = request.responseText;
         jobsDone = true;
         checkStatus();
     }
   };
   request.send(null);
}

var centerResponse = "";
var centerDone = false;

function getCenter(theZip){

   centerDone = false;
   var request = GXmlHttp.create();
   request.open('GET', 'proxy.php?url='+URLencode('http://geocoder.us/service/csv/geocode?zip='+theZip), true);
   request.onreadystatechange = function() {
     if (request.readyState == 4) {
         centerResponse = request.responseText;
         centerDone = true;
         checkStatus();
     }
   };
   request.send(null);
}

function checkStatus(){

   if (!(jobsDone && centerDone)){

         document.getElementById("jobs").innerHTML = "Starting...";

   } else if (!(jobsDone || centerDone)){
 
         document.getElementById("jobs").innerHTML = "Almost there...";

   } else if (jobsDone && centerDone){

      var jobDoc = GXml.parse(jobsResponse);
      displayJobs(jobDoc);

   }

}

...

2 Parse the center location

...
function checkStatus(){

   if (!(jobsDone && centerDone)){

         document.getElementById("jobs").innerHTML = "Starting...";

   } else if (!(jobsDone || centerDone)){
 
         document.getElementById("jobs").innerHTML = "Almost there...";

   } else if (jobsDone && centerDone){

      var centerArray = centerResponse.split(",");
      targetLat = centerArray[0];
      targetLong = centerArray[1];

      var jobDoc = GXml.parse(jobsResponse);
      displayJobs(jobDoc);

   }

}
...

3 Create the job array

...
function displayJobs(jobDoc){

   var totalResultsElement = jobDoc.documentElement.getElementsByTagName("totalresults").item(0);
   var numberOfJobs = GXml.value(totalResultsElement);

   var jobString = "There are "+numberOfJobs+" jobs.
";
   
   var jobsElement = jobDoc.documentElement.getElementsByTagName("results").item(0);
   var jobsList = jobsElement.getElementsByTagName("result");
   var numberOfJobsOnThisPage = jobsList.length;

   jobString = jobString + "<table>";

   var jobsArray = new Array();
   for (i = 0; i < numberOfJobsOnThisPage; i++){
       var thisJob = jobsList.item(i);
       jobsArray[i] = thisJob;
   }

   for (i = 0; i < numberOfJobsOnThisPage; i++){

       var thisJob = jobsArray[i];
       var infoUrl = GXml.value(thisJob.getElementsByTagName("url").item(0));

...

4 Comparing array items

...
   getJobs(url);
   getCenter(theForm.elements["l"].value);

}

function compare (a, b){

    latitudeA = GXml.value(a.getElementsByTagName("latitude").item(0));
    longitudeA = GXml.value(a.getElementsByTagName("longitude").item(0));

    distanceAsquared = (targetLat - latitudeA)*(targetLat - latitudeA) +
                       (targetLong - longitudeA)*(targetLong - longitudeA);

    latitudeB = GXml.value(b.getElementsByTagName("latitude").item(0));
    longitudeB = GXml.value(b.getElementsByTagName("longitude").item(0));

    distanceBsquared = (targetLat - latitudeB)*(targetLat - latitudeB) +
                       (targetLong - longitudeB)*(targetLong - longitudeB);

    return distanceAsquared - distanceBsquared;

}

var targetLong = null;
var targetLat = null;
...

Sorting the array

...
   var jobsArray = new Array();
   for (i = 0; i < numberOfJobs; i++){
       var thisJob = jobsList.item(i);
       jobsArray[i] = thisJob;
   }
   jobsArray.sort(compare);

   for (i = 0; i < numberOfJobs; i++){

       var thisJob = jobsArray[i];
       var infoUrl = GXml.value(thisJob.getElementsByTagName("url").item(0));
...

5 Test the orders

...
   var jobsArray = new Array();
   for (i = 0; i < numberOfJobs; i++){
       var thisJob = jobsList.item(i);
       var jobtitle = GXml.value(thisJob.getElementsByTagName("jobtitle").item(0));
       jobString = jobString + jobtitle + "<br />";
       jobsArray[i] = thisJob;
   }
   jobsArray.sort(compare);
...

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