Answers for "getElementsByName"

select input by name javascript

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

check the doc name in javascript

var path = window.location.pathname;
var page = path.split("/").pop();
console.log( page );

getelementbyid

document.getElementById("someid");

getElementById js

function myFunc(variable){
  var s= document.getElementById(variable);
  s.value = 'New value'
}