CODEWITHSUNDEEP
javascript
Hector Barbossa
Hector Barbossa

Reputation: 5528

File Size and Format before uploading

Is there any way to check for file format and size of the file before uploading it in javascript?

Upvotes: 1

Views: 827

Answers (3)

Zathrus Writer
Zathrus Writer

Reputation: 4331

I believe you can retrieve size information about the file using FLASH, however to determine the file format, you will most probably need to rely on the file extension... and that's a weak determination with regards to security (malware etc.)

Upvotes: 0

Sarfraz
Sarfraz

Reputation: 382909

No, that's not possible. You can check for the extension but still it could be wrong because a text file renamed to zip will show you zip as an extension. You need server-side script for that.

Once file is uploaded, you can check its mime-type and size with server-side script.

Upvotes: 5

Alberto Zaccagni
Alberto Zaccagni

Reputation: 31590

Assuming you've obtained the fileTobeUploaded object (i don't know how you are doing the upload), with the following you could get the size in bytes. 

var reader = new FileReader();
reader.onload = (function(theFile) {
    alert(theFile.size);
})(fileTobeUploaded);

Upvotes: 0

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