The screen suddenly goes blank when attempting to load a Google Charts example using XMLHttpRequest

I'm currently working on a page that utilizes the XMLHttpRequests to avoid reloading the entire page. Once the user logs in, it should display a chart. You can find the main page here: http://pastebin.com/h55Vzuvy And this is the chart we are trying to load: http://pastebin.com/zDZr3bb6

Although the code for loading the chart.php file isn't shown here, it does work correctly and simply calls the xmlhttpGet function from the header of the main page.

The page where the chart should be loaded does execute JavaScript, as confirmed by placing an alert which pops up. However, the graph itself doesn't seem to load. Any thoughts on why this might be happening?

In addition, when attempting to load the chart file, the Chrome JS Debugger throws the following error message. I have verified multiple times that the div name is being passed properly to the variables, and the issue only arises when loading the chart page.

Uncaught TypeError: Cannot set property 'innerHTML' of null
sethtml
callBackFunction
xmlHttpReq.onreadystatechange
javascriptajaxxmlhttprequestgoogle-visualization

Answer №1

Upon initial inspection, everything appears to be in order. However, it seems that the issue lies within this line:

document.getElementById(div).innerHTML=content;

It appears that 'div' (which should be 'auth_status' at this juncture) may not be properly set or the DOM has been altered which has disrupted the auth_status div.

I suggest running a test with:

console.log("id: " + div);

Just before this line of code (line 66). If it displays "auth_status" as expected, I recommend entering this in the firebug/chrome js console:

document.getElementById(div)

To verify that it is still present in the DOM. Best of luck!

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