How to fix javascript reference error: prompt not defined [duplicate]

Question

I wrote code for simple weight conversion and an annual profit calculator program asking the user for input. When I run the programs in vscode it displays the error "ReferenceError: prompt is not defined."

var weight_in_lbs = prompt("Please enter the weight in lbs you wish to convert:");
var pound_to_kg = (weight_in_lbs * .45359237);
console.log("The weight converted in kg is" + " " + pound_to_kg.toFixed(3))`

var annualSales = prompt("What is the projected total sales amount?");
var salesPrediction = (annualSales * .23);
console.log ("Your annual profit is " + salesPrediction.toFixed(2)) ;

@Pointy that does sound like it's run in the node env then. Unless I'm missing smth. — Clarity
– Clarity, Commented Aug 31, 2019 at 18:25

P Ackerman · Accepted Answer · 2019-08-31 18:32:53Z

2

prompt is not a valid construct in the Node.js runtime (which assumedly is what you are running in through VSCode). It will only work in browser-based JavaScript engines.

There are libraries that offer similar functionality, but you would have to install via NPM and import them into your scripts.

answered Aug 31, 2019 at 18:32

P Ackerman

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ctaleck · Accepted Answer · 2019-08-31 18:36:40Z

0

In VS Code, which uses the Electron environment, the prompt function is not support as it is UI blocking. See this issue for more info.

You will need to run your example in a browser such as in the snippet below.

var weight_in_lbs = prompt("Please enter the weight in lbs you wish to convert:");
var pound_to_kg = (weight_in_lbs * .45359237);
console.log("The weight converted in kg is" + " " + pound_to_kg.toFixed(3))
var annualSales = prompt("What is the projected total sales amount?");
var salesPrediction = (annualSales * .23);
console.log("Your annual profit is " + salesPrediction.toFixed(2));

answered Aug 31, 2019 at 18:36

ctaleck

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