In this JavaScript Tutorial, we will learn Exception Handling and how to use try & catch blocks. We will also learn the role of finally block and how we use it with try and catch blocks.
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<!DOCTYPE html> <head> <Title> Java Script Windows </Title> </head> <body> <Script type="text/javascript"> function NoException() { //Sample 01: Without Exception Handler var theNumber = document.getElementById("ANumber").value; theNumber = TheNumber + 1; document.getElementById("SayThanks").innerHTML += "1. Thank You <br>"; } function WithTryCatch() { //Sample 01: With Exception Handler try { var theNumber = document.getElementById("ANumber").value; theNumber = TheNumber + 1; document.getElementById("SayThanks").innerHTML += "1. Thank You <br>"; } catch(error) { document.getElementById("ReportError").innerHTML = error.message; } document.getElementById("SayThanks").innerHTML = "2. Thank You <br>"; } function WithTryCatchFinally() { //Sample 01: With Exception Handler try { var theNumber = document.getElementById("ANumber").value; theNumber = TheNumber + 1; document.getElementById("SayThanks").innerHTML += "1. Thank You <br>"; } catch(error) { document.getElementById("ReportError").innerHTML = error.message; } finally { document.getElementById("SayThanks").innerHTML += "Clean-Up Activity <br>"; } } </Script> <input type="text" id="ANumber" value="650" /> <input type="button" value="No Exception" onclick="NoException()"/> <input type="button" value="Try..Catch" onclick="WithTryCatch()"/> <input type="button" value="Try..Catch..Finally" onclick="WithTryCatchFinally()"/> <h3 id="SayThanks"></h3> <h3 id="ReportError"></h3> </body> </html> |
Categories: JavaScript-Tube
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