Some experiments with web applications
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// variable to en-/disable debug
// set to 1 to enable debug log
var DEBUG;
// server url
var serverUrl = "http://widgets.vvo-online.de/abfahrtsmonitor/";
// xmlhttp object function
function getHTTPObject() {
// debug log
if (DEBUG === 1) {console.log("xml http object function");}
var xhr;
// check for availibility if xmlhttprequest object
if(window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
} else if(window.ActiveXObject) {
xhr = new ActiveXObject("Msxml2.XMLHTTP");
}
return xhr;
}
// ajax call function
function ajaxCall(dataUrl, outputElement, callback, responseType) {
// debug log
if (DEBUG === 1) {console.log("ajax function");}
// get the xmlhttp object which is supported
var request = getHTTPObject();
outputElement.innerHTML = "Lade Daten ...";
request.onreadystatechange = function() {
if(request.readyState === 4 && request.status === 200) {
//save ajax response
if (responseType === "json") {
var response = JSON.parse(request.responseText);
} else if (responseType === "xml") {
var response = request.responseXML;
} else {
var response = request.responseText;
}
// check if callback is a function
if(typeof callback === "function") {
callback(response);
}
}
};
request.open("get", dataUrl, true);
request.send(null);
}
// wrap all in anonymous function to get out of global scope
(function() {
// debug log
if (DEBUG === 1) {console.log("anonymous function");}
// get the search form
var searchForm = document.getElementById("search-form");
// haltestelle object
var haltestelle = {
getInfo : function(event) {
// debug log
if (DEBUG === 1) {console.log("getInfo function");}
// prevent submit default behaviour
event.preventDefault();
// get output area
var target = document.getElementById("output");
var hstName = document.getElementById("q").value;
var hstUrl = serverUrl + "Abfahrten.do?ort=dresden&hst=" + hstName;
ajaxCall(hstUrl, target, function(data) {
// debug log
if (DEBUG === 1) {console.log("received data: " + data);}
data = data.replace(/\],\[/gi, '#');
data = data.replace(/\(.+?\)/gi, '');
data = data.replace('ß', 'ss');
data = data.slice(2,-2).split("#");
// debug log
if (DEBUG === 1) {console.log("parsed data: " + data);}
var i;
var y;
var htmlOutput;
var dataLength = data.length;
// generate table header
htmlOutput = "<table>";
htmlOutput += "<tr>";
htmlOutput += "<th>Linie</th>";
htmlOutput += "<th>Richtung</th>";
htmlOutput += "<th>Abfahrt</th>";
htmlOutput += "</tr>";
// generate table entries
for (i = 0; i < dataLength; i++) {
htmlOutput += "<tr>";
var entry = data[i].split(",");
// debug log
if (DEBUG === 1) {console.log("part " + i + " of parsed data: " + entry);}
for (y = 0; y < 3; y++) {
// debug log
if (DEBUG === 1) {console.log("part " + y + ": " + entry[y]);}
htmlOutput += "<td>" + entry[y].slice(1,-1) + "</td>";
}
htmlOutput += "</tr>";
}
// close table
htmlOutput += "</table>";
// print table into web page
target.innerHTML = htmlOutput;
}, "text");
}
};
//event listeners
searchForm.addEventListener("submit", haltestelle.getInfo, false);
})(); // end of anonymous function