/*
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Copyright (C) 2009 Adobe Systems.
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*/
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// initialize temporary variables
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var found = false;
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var ahHomeValue;
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var page = extractRequestParameter('page');
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/*
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The function processes the query from HIL and redirect accordingly. This is the method that is
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invoked by the HTML page.
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*/
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function processQuery() {
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readFileHttp('helpmap.txt', helpMapHandler);
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}
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/*
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Read a file using xmlhttprequest
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If the HTML file with your javascript app has been saved to disk,
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this is an easy way to read in a data file. Writing out is
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more complicated and requires either an ActiveX object (IE)
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or XPCOM (Mozilla).
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fname - relative path to the file
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callback - function to call with file text
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*/
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function readFileHttp(fname, callback) {
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var xmlhttp = getXmlHttp();
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xmlhttp.onreadystatechange = function() {
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// if the ready state indicates file load is complete
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// invoke the call back function
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if(this.readyState == 4) {
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// check if the file was actually found on the server
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// this is indicated by HTTP status code 200
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// a local file return HTTP 0 :)
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if(this.status == 200 || this.status == 0) {
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return callback(xmlhttp.responseText);
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}
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}
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}
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xmlhttp.open("GET", fname, true);
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xmlhttp.send(null);
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}
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/*
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Return a cross-browser xmlhttp request object.
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*/
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function getXmlHttp() {
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if (window.XMLHttpRequest) {
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xmlhttp=new XMLHttpRequest();
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} else if (window.ActiveXObject) {
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xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
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}
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if (xmlhttp == null) {
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// the browser does not support AJAX
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// return and fall back to META refresh
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document.getElementById('contents').innerHTML = '<p>Redirecting...!</p>';
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}
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return xmlhttp;
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}
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/*
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The function pases the helpmap.txt file looking for the given pageID. If it
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is not found, the value for AH_HOME is used. In case of any error, the function
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would terminate and logic would fall back to META refresh.
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*/
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function helpMapHandler(x) {
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// extract individual line from input
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var lines = x.split('\n');
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for(var i = 0; i < lines.length; i++ ) {
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// tokenize each line - these are tab separated
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var tokens = lines[i].split('\t');
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// check if atleast 2 tokens are present
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if(tokens.length > 2) {
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if(tokens[0] == page) {
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found = true;
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redirect(tokens[1]);
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break;
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}
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if(tokens[0] == 'AH_HOME') {
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ahHomeValue = tokens[1];
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}
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}
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}
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if(!found) {
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redirect(ahHomeValue);
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}
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}
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/*
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The function extracts the query parameters from the request, for the given
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named parameter. If the parameter is not found, an empty String is returned.
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*/
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function extractRequestParameter(name) {
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name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
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var regexS = "[\\?&]"+name+"=([^&#]*)";
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var regex = new RegExp( regexS );
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var results = regex.exec( window.location.href );
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if( results == null ) {
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return "";
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}
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return results[1];
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}
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/*
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Redirect the document to the given URI
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*/
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function redirect(x) {
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location.replace(x);
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}
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