Answers for "js get object field value by field name"

how to get input object in js by name

var element = document.querySelector("form[name='second'] input[name='secondText']");

get object field from variable name javascript

var something = {
  bar: 'foo'
};
var foo = 'bar';

// both x = something[foo] and something[foo] = x work as expected
console.log(something[foo]);
console.log(something.bar)