The read-only property MediaError.message
returns a human-readable string offering specific diagnostic details related to the error described by the MediaError
object, or an empty string (""
) if no diagnostic information can be determined or provided.
A string providing a detailed, specific explanation of what went wrong and possibly how it might be fixed. This is not a generic description of the MediaError.code
property's value, but instead goes deeper into the specifics of this particular error and its circumstances. If no specific details are available, this string is empty.
This example creates a <audio>
element, establishes an error handler for it, then lets the user click buttons to choose whether to assign a valid audio file or a missing file to the element's src
attribute. The error handler outputs a message to a box onscreen describing the error, including both the code
and the message
.
Only the relevant parts of the code are displayed; you can see the complete source code here.
The example creates an <audio>
element and lets the user assign either a valid music file to it, or a link to a file which doesn't exist. This lets us see the behavior of the error
event handler, which is received by an event handler we add to the <audio>
element itself.
The error handler looks like this:
audioElement.onerror = () => {
let s = "";
const err = audioElement.error;
switch (err.code) {
case MediaError.MEDIA_ERR_ABORTED:
s += "The user canceled the audio.";
break;
case MediaError.MEDIA_ERR_NETWORK:
s += "A network error occurred while fetching the audio.";
break;
case MediaError.MEDIA_ERR_DECODE:
s += "An error occurred while decoding the audio.";
break;
case MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED:
s +=
"The audio is missing or is in a format not supported by your browser.";
break;
default:
s += "An unknown error occurred.";
break;
}
const message = err.message;
if (message?.length > 0) {
s += `${message}`;
}
displayErrorMessage(`<strong>Error ${err.code}:</strong> ${s}<br>`);
};
This gets the MediaError
object describing the error from the error
property on the HTMLAudioElement
representing the audio player. The error's code
attribute is checked to determine a generic error message to display, and, if message
is not empty, it's appended to provide additional details. Then the resulting text is output to the log.