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![Here is the try...catch...finally block syntax − <script type = "text/javascript"> <!-- try { // Code to run [break;] } catch ( e ) { // Code to run if an exception occurs [break;] } [ finally { // Code that is always executed regardless of // an exception occurring }] //--> </script>](https://image.slidesharecdn.com/javascripterrorsexceptionshandling-210425084818/75/Java-script-errors-amp-exceptions-handling-5-2048.jpg)
Java script errors & exceptions handling
- 1. JavaScript - Errors& Exceptions Handling
- 5. Here is thetry...catch...finally block syntax − <script type = "text/javascript"> <!-- try { // Code to run [break;] } catch ( e ) { // Code to run if an exception occurs [break;] } [ finally { // Code that is always executed regardless of // an exception occurring }] //--> </script>
- 6. <html> <head> <script type ="text/javascript"> function myFunc() { var a = 100; alert("Value of variable a is : " + a ); } </script> </head>
- 7. <body> <p>Click the followingto see the result:</p> <form> <input type = "button" value = "Click Me" onclick = "myFunc();" /> </form> </body> </html>
- 8. <html> <head> <script type ="text/javascript"> function myFunc() { var a = 100; try { alert("Value of variable a is : " + a ); } catch ( e ) { alert("Error: " + e.description ); } } </script> </head> <body> <p>Click the following to see the result:</p> <form> <input type = "button" value = "Click Me" onclick = "myFunc();" /> </form> </body> </html>
- 9. <html> <head> <script type ="text/javascript"> function myFunc() { var a = 100; try { alert("Value of variable a is : " + a ); } catch ( e ) { alert("Error: " + e.description ); }
- 10. finally { alert("Finally blockwill always execute!" ); } } </script> </head> <body> <p>Click the following to see the result:</p> <form> <input type = "button" value = "Click Me" onclick = "myFunc();" /> </form> </body> </html>
- 12. <html> <head> <script type ="text/javascript"> function myFunc() { var a = 100; var b = 0; try { if ( b == 0 ) { throw( "Divide by zero error." ); } else { var c = a / b; } } catch ( e ) { alert("Error: " + e ); } } </script> </head> <body> <p>Click the following to see the result:</p> <form> <input type = "button" value = "Click Me" onclick = "myFunc();" /> </form> </body> </html>
- 14. <html> <head> <script type ="text/javascript"> window.onerror = function () { alert("An error occurred."); } </script> </head> <body> <p>Click the following to see the result:</p> <form> <input type = "button" value = "Click Me" onclick = "myFunc();" /> </form> </body> </html>
- 16. <html> <head> <script type ="text/javascript"> window.onerror = function (msg, url, line) { alert("Message : " + msg ); alert("url : " + url ); alert("Line number : " + line ); } </script> </head> <body> <p>Click the following to see the result:</p> <form> <input type = "button" value = "Click Me" onclick = "myFunc();" /> </form> </body> </html>