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why this function is not getiing "call"?

I'm trying to record how much time user is taking to read a piece of text. I'm using ajax to fetch a text file and show it to html page. IT works fine, but the corresponding time watching functions are not showing any effect. To make the question clear, I'm copying my script here. Following is JS script. ajax object is defined in other file, and it is working fine. This script is included by a html page with two button elements and a div to display text.
/* * This script uses ajax object defined in ajax.js file, to load content from * ajaxtest.html. */ //global variables to store start time, end time and reading time. stime = 0; etime = 0; rtime = 0; function watchTime() { //get current time into minutes: var today = new Date(); var h = today.getHours(); //get hour part of the day. var m = today.getMinutes(); //get minute part of the day. var mtemp = m * 60; var s = today.getSeconds(); //get second part of the day. return mtemp + s; } function startReading() { 'use strict'; stime = watchTime(); console.log(stime); } function endReading() { 'use strict'; etime = watchTime(); console.log(etime); rtime = etime - stime; console.log(rtime); } window.onload = function() { 'use strict'; document.getElementById('stbtn').onclick = function() { startReading(); //This function is not getting "call". ajax.open('GET', 'resources/test.txt', true); ajax.send(null); } var ajax = getXMLHttpRequestObject(); //create function for onreadystatechange ajax.onreadystatechange = function() { if(ajax.readyState == 4) { if((ajax.status >= 200 && ajax.status < 300) || (ajax.status == 304)) { document.getElementById('output').innerHTML = ajax.responseText; } else { document.getElementById('output').innerHTML = 'Error' + ajax.statusText; } } //end of readyState IF. } //End of main function. document.getElementById('endbtn').onclick = endReading; //This line does not show any effect. }

Posted On: Sunday 23rd of December 2012 10:40:15 PM Total Views:  326
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