Some experiments with web applications
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// server url
var serverUrl = "http://widgets.vvo-online.de/abfahrtsmonitor/";
// xmlhttp object function
function getHTTPObject() {
console.log("xml http object function");
var xhr;
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) {
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
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() {
console.log("anonymous function");
// get the search form
var searchForm = document.getElementById("search-form");
// haltestelle object
var haltestelle = {
getInfo : function(event) {
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) {
target.innerHTML = "";
target.innerHTML = "<p>" + data + "</p>";
});
}
};
//event listeners
searchForm.addEventListener("submit", haltestelle.getInfo, false);
})(); // end of anonymous function