The code presented in this page shows how to get the duration (in seconds) of an audio /video file before upload it (AVI, MP3, MP4, MPEG, OGG), then, adds it into an input field in a form.
<h4>Example getting duration of audio/video file before upload</h4>
<p>Select an audio /video file</p>
<form action='#' method='post' enctype='multipart/form-data'>
File: <input type='file' name='fup' id='fup' /><br>
Duration: <input type='text' name='f_du' id='f_du' size='5' /> seconds<br>
<input type='submit' value='Upload' />
</form>
<audio id='audio'></audio>
<script>
// Code to get duration of audio /video file before upload - from: https://coursesweb.net/
//register canplaythrough event to #audio element to can get duration
var f_duration =0; //store duration
document.getElementById('audio').addEventListener('canplaythrough', function(e){
//add duration in the input field #f_du
f_duration = Math.round(e.currentTarget.duration);
document.getElementById('f_du').value = f_duration;
URL.revokeObjectURL(obUrl);
});
//when select a file, create an ObjectURL with the file and add it in the #audio element
var obUrl;
document.getElementById('fup').addEventListener('change', function(e){
var file = e.currentTarget.files[0];
//check file extension for audio/video type
if(file.name.match(/\.(avi|mp3|mp4|mpeg|ogg)$/i)){
obUrl = URL.createObjectURL(file);
document.getElementById('audio').setAttribute('src', obUrl);
}
});
</script>
<audio> element is used to can get the duration of the file that is added in the "src" attribute.<a href="http://coursesweb.net/" title="CoursesWeb.net">CoursesWeb.net</a>
h2 {
font-family:"Calibri",sans-serif;
}var elm_list = document.querySelectorAll("div.cls");
var nr_elms = elm_list.length; // number of selected items
alert(nr_elms);$arr =[1, 2, 3, 4); $arr_sum = array_sum($arr); echo $arr_sum; // 10