Sometimes we want to display progress while downloading big resource See demo page how to accomplish this in pure javascript

Progress class has only 1 method: get

var progress = new Progress();            
progress.get(url,onprogress,onerror,onload);    
// where: url is the resource url     
// the 3 other parameters are callback functions    

See demo page source for more details

See demo here

Tested at:

OSX:

• safari 6.1
• Firefox 25.0
• Chrome 31.0.1650.57
• Opera 12.16

To create big binary file with random staff in it (10M) except first bytes which should be "foo.bar" \x66\x6f\x6f\x0a\x62\x61\x72

// create file
head -c 10M </dev/urandom > test.bin

// Then override the first 7 bytes with 

printf '\x66\x6f\x6f\x0a\x62\x61\x72' | dd conv=notrunc of=test.bin bs=7 seek=$((0x00000000))

To create big text file with filled with "1" (10M) except first chars which should be "foo.bar"

// create file
tr -dc A-Za-z0-9 </dev/urandom |  head -c 10M > test.txt

// Then change first 7 chars to foo.bar 

!!!
cat test.txt | sed 's/^......./foo.bar/' > test.txt

So for the test first 7 elements in data:

• for binary should be 102,111,111,46,98,97,114
• for test should be foo.bar