Question

42

IE issue - Object.keys(value).length not supported

rated 0 times [ 49] [ 7] / answers: 1 / hits: 16815 / 12 Years ago, wed, december 5, 2012, 12:00:00

I've been trying to debug some js in Internet Explorer, and I can't figure this one out. Here's the line that is causing the error:

var numberOfColumns = Object.keys(value).length;

And the error is...

Message: Object doesn't support this property or method

Line: 640

Char: 5

Code: 0

URI: xxx

At first I thought it had something to do with the Object.keys(value).length; property, but strangely (for me anyways), the error is at char 5, which is the beginning of the variable name.

Anyways, I have no idea what's going on or how to fix it. Also, if I replace:

var numberOfColumns = Object.keys(value).length;

With ...

var numberOfColumns = 9; // troubleshooting

The error persists. Please help.

Update

jsFiddle added

http://jsfiddle.net/4Rab7/

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jaelynncherokeeg

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answered 12 Years ago moriah · Accepted Answer

The keys property is supported in IE >= 9. You are probably testing it in an earlier version. A simple workaround is:

var length = 0;

for(var prop in data){

    if(data.hasOwnProperty(prop))

        length++;

}

Here is a demonstration: http://jsfiddle.net/vKr8a/

See this compatibility table for more info:

http://kangax.github.com/es5-compat-table/