Convert FORM elements to JSON snippet

snippet_convertFormToJSON.js

var json;
function toJSON(selector) {
 var elements = document.querySelectorAll(selector+' [name]');
 var obj = {};
 for(var ele=0;ele<elements.length;ele++) {
  var t = elements[ele];
  obj[t.name] = t.value;
 }
 prompt("form "+selector+"", JSON.stringify(obj))
};
var d = document;
var choose = d.createElement('div');
choose.id = 'choose';
var oforms = document.querySelectorAll('form');
var forms = "";
for(var i=0;i<oforms.length;i++) {
  var oForm = oforms[i];
  var sel = (oForm.id) ? '#'+oForm.id : 'form:nth-child('+(i+1)+')';
  forms+="<option sel='"+sel+"'>"+sel+"</option>";
}
choose.innerHTML = '<div style="margin: 1em;position:absolute;z-index:100;top:2em;left:2em;outline:white 2em solid;"><h2 style="color: black;background-color: white;">Select form to convert to JSON</h2><select onchange="choose.remove();toJSON(this.value)"><option>Choose form</option>'+forms+'</select></div>';
d.body.appendChild(choose);