Build a Roman Numeral Converter Project - Build a Roman Numeral Converter

JavaScript
1 
When you click on the #convert-btn element without entering a value into the #number element, the #output element should contain the text Please enter a valid number

What is required is above

btn.addEventListener("click", numberInput);
function numberInput(){
    
if(number === null && convert-btn.onclick("click")){
    output.textContent = "Please enter a valid number"
}

i want to display and output of please enter valid number after clicking convert button when the button is clicked and there is no text entered in the converter as defined in the if arguement however it wont pass

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Challenge Information:

Build a Roman Numeral Converter Project - Build a Roman Numeral Converter

2

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3

where does the output variable comes from?
please show all your html and javascript

4

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