Categories: Javascript

JavaScript onerror() method to handle error

The JavaScript onerror method is the first thing to handle error in JavaScript. This error event is called on the window object whenever any exception occurs on the page.

There are three pieces of information to identify the exact error:

Error message
URL, in which file the error occurred
The line number in the given URL where error occurred

Example of JavaScript onerror:

<html>
<head>
<script type="text/javascript">
window.onerror = function (msg, url, line) {
console.log("Message : " + msg );
console.log("url : " + url );
console.log("Line number : " + line );
}
</script>
</head>
<body>
<p>Click the following button:</p>
<form>
<input type="button" value="Click Here" >
Read Also: JavaScript Strict mode
 Alternatively, you can use an onerror method to display an error message if there is any problem in loading an image.
 <img src="image.jpg" onerror="alert('Loading failed')" />
 
Jacob Frazier
Based on United States, Jacob Frazier is a skilled JavaScript developer with over 8 years of experience. He is passionate about change and trying new things, both professionally and personally. He loves startups and is extremely proactive.