seeing javascript errors

[pradeepjain]

Hii ..i am a lamp professional!! i use javascript for validation purposes! but sometimes javascript stops working bcos of errors!!and i find it difficult to find those errors! is there any log for javascript errors??

[RamananKalirajan]

Pradeepjain,
Ya, there are two ways of finding errors in your codes. The first way is writing your js code inside a try catch block and the other is to test the codes with the alerts one line after the other. These are the possible two ways through which u can find or debug an error in the js.

Try Catch Block

try{
// your JS Code...
// your JS Code...
}
catch(e)
{
   alert(e.message);
}

Alerts

js line no 1
alert("1");
js line no 2
alert("2");
js line no 3
alert("3");
js line no 4
alert("4");

Thanks and Regards
Ramanan Kalirajan

[oranoos3000]

showing error in separate window for debugging

hi
you can using this code for showing your error in separate window and the end of debuging your scripts you can erase this code from the other code
on the input of script tag

<script type="text/javascript">
onerror=showErr;
function showErr(errMsg,location,lineNum)
{
ErrWin=window.open('','new window',"width=100, height=100");
ErrWin.document.write('message of error '+errMsg+'<br />place of error '+location+'number of line that have error'+lineNum);
ErrWin.document.close();
}
</script>

and so if your browser is firefox you can see your error
by clicking menu tools->javascript consol
be success

[gits]

another excellent extension for Firefox is Firebug ... have a look here ... i cannot live without it :) ... you could debug, inspect, test nearly everything of a webpage with it ...

kind regards

[ghmcadams]

.Net method of logging JavaScript Errors

I have just released code to help log JavaScript errors by sending error information to the server. If you want to use ASP.Net, you can take a look at the control here -

http://www.thecodepage.com/post/JavaScript-Error-Notifications.aspx