How can i make this JS code simpler help! Too much if statements

Question

Im a rookie in coding, an im figuring a way to shorten this code, it has too many if statements, if someone can help me out, i really apreciatted. I need to add a classList.remove to the same elements too after that

So this is the code:

const inputElementName = document.getElementById("name");
const inputElementMail = document.getElementById("email");

const validateInputName = () => inputElementName.value.trim().length > 0;
const validateInputMail = () => inputElementMail.value.trim().length > 0;

const handleInputName = () => {
    const inputNameIsValid = validateInputName();

    if (!inputNameIsValid) {
        return inputElementName.classList.add("error");
    } 
}

const handleInputMail = () => {
    const inputMailIsValid = validateInputMail();

    if (!inputMailIsValid) {
        return inputElementMail.classList.add("error");
    }
}

Answer 1

Try this

const validateInput = (elm) => elm.value.trim().length > 0;
const handleInput = (elm) => {
    const isValid = validateInput(elm);
    elm.classList.toggle("error", !isValid);
    return isValid;
}

Fiddle: https://jsfiddle.net/codeandcloud/jr5aym6q/