Show image preview before file upload using javascript or jquery

so... my code has no error, i just use yours (who is not bad on some use) without success (but you choose to judge so quick, so strong...), but for some protect reason and/or specificities, sometimes some other codes can works for do it (solution number 3), and then i'm from rails 4 framework with webrick server (works on firefox 25 and chrome 29, not on Safari):


function readURL() {
var input = document.getElementById('FilePhoto');
var fReader = new FileReader();
fReader.readAsDataURL(input.files[0]);
fReader.onloadend = function(event){
var img = document.getElementById(“blah”);
img.src = event.target.result;
}
}

(no need function event call... "onchange" option from file celetion field is ok, and also, no need var "this" on function called from event)

Solution from chakroun yesser, here: http://stackoverflow.com/questions/4851595/how-to-resolve-the-c-fakepath">http://stackoverflow.com/questions/4851595/how-to-resolve-the-c-fakepat


so... i answer my own to myself... and hope some other peoples from your team could said you to go slowly before judge other people so quickly and so strongly, and try to go back school for understand how is construct a question... (and so... it is really a shame...).
If you don't know guys, just said: I'm sorry, i don't know.