udom/assets/downloadForm.js

"use strict";

var n    = require('../element/create');
var guid = require('mout/random/guid');
var forIn = require('mout/object/forIn');


function encode(v, k){
  var values = [], t = typeof v ;
  if(v === null)
    return values;
  if(Array.isArray(v))
    v.forEach(function(j){
      values.push.apply(values, encode(j, k+"[]") );
    });
  else if(t == "object")
    forIn(v, function(j, kk){
      values.push.apply(values, encode(j, k ? k+"["+kk+"]" : kk));
    });
  else if(t== "number" || t == "string")
    values.push([k, v]);

  return values;
}


module.exports = function(action, args) {
  var iid = guid(), iframe = n('iframe', {
    id : iid,
    name:iid,
    style : 'display:none',
  });

  var form = n("form", {
      method: 'POST',
      action: action,
      target : iid,
  });

  encode(args).forEach(function(line){
    form.appendChild(n('input', {
      name : line[0],
      value: line[1],
    }));
  });

  document.body.appendChild(iframe);
  iframe.contentWindow.document.body.appendChild(form);

  form.submit();
  form.parentNode.removeChild(form)
};