Leaflet.org

Every once in a while I learn about a JavaScript property that I wish I had known about years earlier — valueAsNumber is one of them. The valueAsNumber provides the value of an input[type=number] as a Number type, instead of the traditional string representation when you get the value: /* Assuming an <input type="number" value="1.234" /> */ // BAD: Get the value and convert the number input.value // "1.234" const numberValue = parseFloat(input.value, 10); // GOOD: Use valueAsNumber input.valueAsNumber // 1.234 This property allows us to avoid parseInt/parseFloat, but one gotcha with valueAsNumber is that it will return NaN if the input is empty. Thank you to Steve Sewell for... more →