Javascript FileReader detection in Safari

Question

I'm aware of the fact that the FileReader Object is not available in Safari 5.0.5. I have a script that uses it and thought that i'd just be able to detect whether the object exists to run some alternate code, as is suggested here,

http://www.quirksmode.org/js/support.html

So my code is,

if( FileReader )
{
    //do this

}else{

    //the browser doesn't support the FileReader Object, so do this
}

The problem is, i've tested it in Safari and once it hits the if statement i get this error and the script stops running.

ReferenceError: Can't find variable: FileReader

So obviously that's not the best way to deal with it then? Any idea why this doesn't work?

is FileReader supported in Safari 5.1.5? I'm getting error in 5.1.5 also. — Chirag Mehta
– Chirag Mehta, Commented Apr 6, 2012 at 15:47

Assaf Moldavsky · Accepted Answer · 2011-07-19 15:12:46Z

30

I believe in your case you can get away with a simpler check:

if(window.FileReader) {
   //do this
} else {
   //the browser doesn't support the FileReader Object, so do this
}

check for the type if you really wanna be granular and picky.

answered Jul 19, 2011 at 15:12

Assaf Moldavsky

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1 Comment

John Clarke Mills Over a year ago

Agreed. You must ask for window.FileReader otherwise an Uncaught ReferenceError will occur (observed on Android 2.3)

SLaks · Accepted Answer · 2011-06-19 16:57:42Z

7

You can write if (typeof FileReader !== "undefined")

You can also use the Modernizr library to check for you.

answered Jun 19, 2011 at 16:57

SLaks

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Comments

Daniel · Accepted Answer · 2011-10-17 12:24:40Z

2

Or you can do something like this.

if('FileReader' in window) {
    // FileReader support is available
} else {
    // No support available
}

answered Oct 17, 2011 at 12:24

Daniel

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