JavaScript Throw Statement
The throw statement allows you to create an exception.
The Throw Statement
The throw statement allows you to create an exception. If you use
this statement together with the try...catch statement, you can control
program
flow and generate accurate error messages.
Syntax
The exception can be a string, integer, Boolean or an object.
Note that throw is written in lowercase letters. Using uppercase letters will generate a JavaScript error!
Example
The example below determines the value of a variable called x. If the value of x is higher than 10, lower than 0,
or not a number, we are going to throw an error.
The error is then caught by the catch argument and the proper error message is displayed:
Example
<html>
<body>
<script type="text/javascript">
var x=prompt("Enter a number between 0 and 10:","");
try
{
if(x>10)
{
throw "Err1";
}
else if(x<0)
{
throw "Err2";
}
else if(isNaN(x))
{
throw "Err3";
}
}
catch(er)
{
if(er=="Err1")
{
alert("Error! The value is too high");
}
if(er=="Err2")
{
alert("Error! The value is too low");
}
if(er=="Err3")
{
alert("Error! The value is not a number");
}
}
</script>
</body>
</html> |
Try it yourself »
|
Stylus Studio® 2011 XML Enterprise Suite raises the bar for productivity in XML development tools.
Millions of XML developers and data integration specialists turn to Stylus Studio's comprehensive and
intuitive XML toolset to tackle today's advanced XML data transformation and aggregation challenges.
|
- XML Pipeline Editor, Debugger and Code Generator
- DataDirect XML Converters
- XQuery Mapper, Editor, Debugger, and Profiler
- XSLT Mapper, Editor, Debugger, Designer, and Profiler
- Java and C# for .Net Code Generation
- XML Schema Designer With Documentation Generator
- XML Editor With Full XPath Integration
Download a free trial now
|
|