Created
October 12, 2016 23:10
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try...catch statement. Example.
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <p>Please input a number between 5 and 10:</p> | |
| <input id="demo" type="text"> | |
| <button type="button" onclick="myFunction()">Test Input</button> | |
| <p id="message"></p> | |
| <script> | |
| function myFunction() { | |
| var message, x; | |
| message = document.getElementById("message"); | |
| message.innerHTML = ""; | |
| x = document.getElementById("demo").value; | |
| try { | |
| if(x == "") throw "empty"; | |
| if(isNaN(x)) throw "not a number"; | |
| x = Number(x); | |
| if(x < 5) throw "too low"; | |
| if(x > 10) throw "too high"; | |
| } | |
| catch(err) { | |
| message.innerHTML = "Input is " + err.message; | |
| } | |
| finally { | |
| return false; | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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