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How To Test For Bad Numbers Using Javascript?

Answer»

the global method, "isNaN()" can TELL if a number has GONE bad. 
var TEMPERATURE = parseFloat(myTemperatureWidget.value);
if(!isNaN(temperature)) {
alert("PLEASE enter a valid temperature.");
}

the global method, "isNaN()" can tell if a number has gone bad. 
var temperature = parseFloat(myTemperatureWidget.value);
if(!isNaN(temperature)) {
alert("Please enter a valid temperature.");
}


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