e.startsWith is not a function

[Jan Jerell]

Hi,

Good day!

I use different ASP.Net Telerik controls in every page in my project.
I'm getting this javascript error: "e.startsWith is not a function"
every time I click every where on the page.

The error is in MicrosoftAjax.js which is embedded in the page by the Telerik.
I attached here the screenshot of the error I'm getting.

Does anybody here also experienced this error? How did you fix it?

Thank you.


Jan

[sitefinitysteve]

Wieeerd....Whats the Browser Version and RadControls Version?

Is this Live somewhere in which I can see?

[Jan Jerell]

With deep tracing on the javascript file. I was able to figure it out what did the error but I am not able to figure out the real cause.
In the code, it tries to call the startsWith function with a variable that holds function() object like: if ( e.startsWith(blahblahblahID))
where e = function()

I fixed it by adding the startsWith function to Function object in a separate javascript file which I then add later to the page.
Here's what I did:

Function.prototype.startsWith = function (str) {
    return false;
}

And that did the fix. :)