HTML video player
Question
I want to play video file from local disk in browser so I found this code. Can You tell me why it does not work? On jsfiddle it works but when i copy it into project it won't work. Also can You tell me what gives function declaration like function name(x){variables}(window) .
The error I get is Uncaught TypeError: Cannot read property 'addEventListener' of null
Thanks for Your help :)
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<script>
(function localFileVideoPlayerInit(win) {
var URL = win.URL || win.webkitURL,
playSelectedFile = function playSelectedFileInit(event) {
var file = this.files[0];
var type = file.type;
var videoNode = document.querySelector('video');
var canPlay = videoNode.canPlayType(type);
canPlay = (canPlay === '' ? 'no' : canPlay);
var message = 'Can play type "' + type + '": ' + canPlay;
var isError = canPlay === 'no';
displayMessage(message, isError);
if (isError) {
return;
}
var fileURL = URL.createObjectURL(file);
videoNode.src = fileURL;
},
inputNode = document.querySelector('input');
if (!URL) {
displayMessage('Your browser is not ' +
'<a href="http://caniuse.com/bloburls">supported</a>!', true);
return;
}
inputNode.addEventListener('change', playSelectedFile, false);
}(window));
</script>
<h1>HTML5 local video file player example</h1>
<div id="message"></div>
<input type="file" accept="video/*"/>
<video controls autoplay></video>
</body>
</html>
1 answers
solution1
1 ACCPTED 2014-06-19 09:04:14
The problem is, your code is running before the DOM is ready/loaded.
There's two way to fix this.
1) Move the the entire javascript code block below <video controls autoplay></video>
or
2) Use document.addEventListener("DOMContentLoaded", function() { }); like this:
<script>
document.addEventListener("DOMContentLoaded", function() {
var URL = window.URL || window.webkitURL,
playSelectedFile = function playSelectedFileInit(event) {
var file = this.files[0];
var type = file.type;
var videoNode = document.querySelector('video');
var canPlay = videoNode.canPlayType(type);
canPlay = (canPlay === '' ? 'no' : canPlay);
var message = 'Can play type "' + type + '": ' + canPlay;
var isError = canPlay === 'no';
displayMessage(message, isError);
if (isError) {
return;
}
var fileURL = URL.createObjectURL(file);
videoNode.src = fileURL;
},
inputNode = document.querySelector(("input[type=file]"));
if (!URL) {
displayMessage('Your browser is not ' +
'<a href="http://caniuse.com/bloburls">supported</a>!', true);
return;
}
inputNode.addEventListener('change', playSelectedFile, false);
});
</script>
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