Javascript error : object required

Question

I am calling a javascript function in a button in aspx page like

OnClientClick= "printText(document.getElementById('PrintPayslipPart').innerHTML)"

and function is;

function printText(elem)
     { 
        PrintPaySlip = window.open('RP_PrintPaySlip.html','PrintPaySlip','toolbar=no,menubar=yes,width=1000, Height = 700, resizable=yes,scrollbar=Yes'); 
        PrintPaySlip.document.open(); 
        PrintPaySlip.document.write("<html><head>");
        PrintPaySlip.document.write("</head><body onload='print()'>"); 
        PrintPaySlip.document.write(elem); 
        PrintPaySlip.document.write("</body></html>"); 
        PrintPaySlip.document.close();
    }

I am using .net 3.5 and ajaxcontrolltoolkit 3.5.40412.2

When clicking on button the error shows as "Microsoft JScript runtime error: Object required".

falstro · Accepted Answer · 2011-02-10 08:24:48Z

1

My guess is that either

PrintPayslipPart is not a valid id, and so the getElementById returns null.
PrintPaySlip is not a global variable, and your environment doesn't allow it to be implicitly defined, which could be solved by declaring it local using var
```
  var PrintPaySlip = window.open(...);
```

The second one seems more likely.

HTH

answered Feb 10, 2011 at 8:24

falstro

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5 Comments

Tim Down Over a year ago

It is true that it would be better to declare PrintPaySlip using var, but it won't be stopping the code from working.

falstro Over a year ago

@Tim; I know it shouldn't but I have had IE bite me on this (worked flawlessly in all other browsers), I'm not sure in what circumstances this happens, but now that you mention it, I think the error message was different.

Tim Down Over a year ago

You're right actually, there's a case I forgot: IE automatically adds properties to the global object (effectively global variables) corresponding to element IDs and doesn't like you trying to assign to these properties, so if you had an element in the document whose id was "PrintPayslipPart" then IE would throw an error if you didn't use var.

falstro Over a year ago

@Tim; ah, so that was what's been causing it! Thanks for clearing this up for me!

Tim Down Over a year ago

I think Chrome does the same thing too but possibly doesn't prevent you from assigning to the global object properties corresponding to element IDs.

Anil Namde · Accepted Answer · 2011-02-10 10:13:45Z

0

first thing i will suggest to you is have Firefox with error console installed and then test the site. At least it can help you find what exactly error is instead of "Microsoft JScript runtime error"

Trust me but Firefox + FireBug + Error Console make life much better for Web (JS) developer.

answered Feb 10, 2011 at 10:13

Anil Namde

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1 Comment

falstro Over a year ago

Except for hunting down the IE bugs, which (unfortunately) are usually numerous.

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