how to check if input is empty in javascript code example

Example 1: how to make input field empty in javascript

Assuming the element you want to change has the id question, so you can do

document.getElementById("question").value = "";

Example 2: how to check if all inputs are not empty with javascript

const inputFeilds = document.querySelectorAll("input");

const validInputs = Array.from(inputFeilds).filter( input => input.value !== "");

console.log(validInputs) //[array with valid inputs]

Example 3: hhow to check input is null in html using js

function required(inputtx) 
   {
     if (inputtx.value.length == 0)
      { 
         alert("message");  	
         return false; 
      }  	
      return true; 
    }