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172 lines
5.7 KiB
172 lines
5.7 KiB
// variable to en-/disable debug
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// set to 1 to enable debug log
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var DEBUG;
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// xmlhttp object function
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function getHTTPObject() {
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// debug log
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if (DEBUG === 1) {console.log("xml http object function");}
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// variable definitions
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var xhr;
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// check for availibility if xmlhttprequest object
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if(window.XMLHttpRequest) {
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xhr = new XMLHttpRequest();
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} else if(window.ActiveXObject) {
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xhr = new ActiveXObject("Msxml2.XMLHTTP");
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}
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return xhr;
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}
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// ajax call function
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function ajaxCall(dataUrl, outputElement, callback, responseType) {
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// debug log
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if (DEBUG === 1) {console.log("ajax function");}
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// variable definitions
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var response,
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request = getHTTPObject(); // get the xmlhttp object which is supported
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outputElement.innerHTML = "Lade Daten ...";
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request.onreadystatechange = function() {
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if(request.readyState === 4 && request.status === 200) {
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//save ajax response
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if (responseType === "json") {
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response = JSON.parse(request.responseText);
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} else if (responseType === "xml") {
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response = request.responseXML;
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} else {
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response = request.responseText;
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}
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// check if callback is a function
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if(typeof callback === "function") {
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callback(response);
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}
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}
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};
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request.open("get", dataUrl, true);
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request.send(null);
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}
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// wrap all in anonymous function to get out of global scope
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(function() {
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//variable definitions
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var serverUrl, // this will hold the url we call with the ajaxCall() function
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target = document.getElementById("output"), // get the html area where we print out the data
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searchForm = document.getElementById("search-form"), // get the search form
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haltestelle; // object with methods to get and process the data
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// debug log
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if (DEBUG === 1) {console.log("anonymous function");}
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// parse actual url and parse for protocol type (http/https)
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// set the ajax server url dependent on the protocol
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// for strato ssl-proxy, we have to insert the 1st part of the url path
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serverUrl = window.location.protocol + "//" + window.location.hostname;
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if (serverUrl.indexOf("https") === -1) {
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serverUrl += "/cgi-bin/";
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} else {
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serverUrl += "/" + window.location.pathname.split("/")[1] + "/cgi-bin/";
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}
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// haltestelle object
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haltestelle = {
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getAbfahrten : function(event) {
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// debug log
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if (DEBUG === 1) {console.log("getAbfahrten() method");}
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// prevent submit default behaviour
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event.preventDefault();
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// construct ajax url
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var hstName = document.getElementById("q").value,
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hstUrl = encodeURI(serverUrl + "abfahrtsmonitor.py?ort=dresden&hst=" + hstName);
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// get the data from the server with an ajax call
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ajaxCall(hstUrl, target, haltestelle.processAbfahrten, "text");
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},
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processAbfahrten : function (data) {
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// debug log
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if (DEBUG === 1) {console.log("processAbfahrten() method");}
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if (DEBUG === 1) {console.log("received data: " + data);}
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//variable definitions
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var i,
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y,
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htmlOutput,
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entry,
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dataLength;
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// process of response only if it's not empty
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if (data.indexOf("[]") === -1) {
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// replace useless chars & split string into array
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data = data.replace(/\],\[/gi, '#'); // insert a special char to mark internal array boundaries
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data = data.replace(/\(.+?\)/gi, ''); // remove all content in round parentheses
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data = data.replace('ß', 'ss'); // remove some special characters
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data = data.replace(/<(.+?)>/gi, '$1'); // remove tag parentheses to prevent code injection
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data = data.slice(3,-3).split("#"); // split on the inserted char to get an array of arrays
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// debug log
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if (DEBUG === 1) {console.log("parsed data: " + data);}
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dataLength = data.length;
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// generate table header
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htmlOutput = "<table>";
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htmlOutput += "<tr>";
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htmlOutput += "<th>Linie</th>";
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htmlOutput += "<th>Richtung</th>";
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htmlOutput += "<th>Abfahrt</th>";
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htmlOutput += "</tr>";
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// generate table entries
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for (i = 0; i < dataLength; i++) {
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htmlOutput += "<tr>";
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entry = data[i].split(",");
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// debug log
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if (DEBUG === 1) {console.log("part " + i + " of parsed data: " + entry);}
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for (y = 0; y < 3; y++) {
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// debug log
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if (DEBUG === 1) {console.log("part " + y + ": " + entry[y]);}
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htmlOutput += "<td>" + entry[y].slice(1,-1) + "</td>";
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}
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htmlOutput += "</tr>";
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}
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// close table
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htmlOutput += "</table>";
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} else { // there was an empty response
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htmlOutput = "<p>Haltestelleneingabe nicht eindeutig</p>";
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}
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// print content into web page
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target.innerHTML = htmlOutput;
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}
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};
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//event listeners
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searchForm.addEventListener("submit", haltestelle.getAbfahrten, false);
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}()); // end of anonymous function
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