in case of input type file the value is stored in array as files with key name.
$('input#my_id').change(function(){var files = $(this)[0].files;if(files.length >10){
alert("you can select max 10 files.");}else{
alert("correct, you have selected less than 10 files");}});fiddle example : http://jsfiddle.net/nze2B/3/
http://stackoverflow.com/questions/9232633/how-to-count-selected-files
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