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  #1 (permalink)  
Old May 26th, 2006, 03:12 AM
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Default refresh a dynamic site


I am having a site, which gets the weather information of 4 cities via an XML Data. I have already done its XSLT via JavaScript it works fine but when I try to write a JavaScript refresh function I am getting an error like
document.getElementById(..)is nuill or not an object. So what should I do?

Here is my Javascript Code Chunk:

var xslProc;
var day = "1";
var wmo = "abcde";

function City(day1,wmo1){
this.day = day1;
this.wmo = wmo1;
xmlPath= "httpfoo.bar&WMO="+wmo1+"&foo.bar";


function Day(day1){
this.day = day1;

function loadXMLDoc(xmlDocURL) {
srcTree = new ActiveXObject("Msxml2.DOMDocument.3.0");
srcTree.async = false;
return srcTree;
function loadXSLDoc(xslDocURL) {
xsltTree = new ActiveXObject("Msxml2.XSLTemplate.3.0");
xslDoc = new ActiveXObject("Msxml2.FreeThreadedDOMDocument.3.0" );
xslDoc.async = false;
xsltTree.stylesheet = xslDoc;
return xslDoc;

function generateHTML(xmlTree,xslTree) {
xslProc = xsltTree.createProcessor();
xslProc.addParameter("wmo", wmo);
xslProc.input = xmlTree;
html = xslProc.output;
return html;

var xmlPath= "http://foo.bar&WMO="+wmo+"&foo.bar";
var xslPath= "weather_city_day.xsl";

function initWeather() {
xmlTree = loadXMLDoc(xmlPath);
xslTree = loadXSLDoc(xslPath);

html = generateHTML(xmlTree, xslTree);
document.getElementById("epoWeather").innerHTML = html;



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Old May 26th, 2006, 04:25 AM
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It looks like you are calling the initWeather() method before the page has finished loading, try moving the method call to the onload event...
window.onload = initWeather;


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Old May 26th, 2006, 04:32 AM
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Ok thanks for the reply but I still have one problem. As you see from the Code there is an xmlPath variable, which changes according to the city code. When I change the city to another city it stops reloading. I have define a refresh Meta tag in HTML and it loads the site fine but this problem still occurs. How can I structure this refresh structure so that it refreshes the page according to the city code? Do you have any idea?

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Old May 26th, 2006, 11:46 PM
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Hii NEO1976!!

you are using refresh meta tag.
also initWeather() method is called.
Suppose your refresh meta tag is set to 1 mints.

initWeather() function is called onload of the page.

suppose the time elapsed between these interval is 10 seconds.
initWeather() function is retrieving data using xml http request, and it takes time around 1-2 mints(for example)
at the same time your meta tag refresh method is called when time elapsed is 1 mint and it refreshes the page.
so ,avoid meta tag refresh method,rather than periodcally call it using javascript.

Hope this will help you

Cheers :)

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