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Viewing file:     jsonp.js (2.41 KB)      -rw-r--r--

'use strict';

var random = require('../../utils/random')
  , urlUtils = require('../../utils/url')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:sender:jsonp');
}

var form, area;

function createIframe(id) {
  debug('createIframe', id);
  try {
    // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
    return global.document.createElement('<iframe name="' + id + '">');
  } catch (x) {
    var iframe = global.document.createElement('iframe');
    iframe.name = id;
    return iframe;
  }
}

function createForm() {
  debug('createForm');
  form = global.document.createElement('form');
  form.style.display = 'none';
  form.style.position = 'absolute';
  form.method = 'POST';
  form.enctype = 'application/x-www-form-urlencoded';
  form.acceptCharset = 'UTF-8';

  area = global.document.createElement('textarea');
  area.name = 'd';
  form.appendChild(area);

  global.document.body.appendChild(form);
}

module.exports = function(url, payload, callback) {
  debug(url, payload);
  if (!form) {
    createForm();
  }
  var id = 'a' + random.string(8);
  form.target = id;
  form.action = urlUtils.addQuery(urlUtils.addPath(url, '/jsonp_send'), 'i=' + id);

  var iframe = createIframe(id);
  iframe.id = id;
  iframe.style.display = 'none';
  form.appendChild(iframe);

  try {
    area.value = payload;
  } catch (e) {
    // seriously broken browsers get here
  }
  form.submit();

  var completed = function(err) {
    debug('completed', id, err);
    if (!iframe.onerror) {
      return;
    }
    iframe.onreadystatechange = iframe.onerror = iframe.onload = null;
    // Opera mini doesn't like if we GC iframe
    // immediately, thus this timeout.
    setTimeout(function() {
      debug('cleaning up', id);
      iframe.parentNode.removeChild(iframe);
      iframe = null;
    }, 500);
    area.value = '';
    // It is not possible to detect if the iframe succeeded or
    // failed to submit our form.
    callback(err);
  };
  iframe.onerror = function() {
    debug('onerror', id);
    completed();
  };
  iframe.onload = function() {
    debug('onload', id);
    completed();
  };
  iframe.onreadystatechange = function(e) {
    debug('onreadystatechange', id, iframe.readyState, e);
    if (iframe.readyState === 'complete') {
      completed();
    }
  };
  return function() {
    debug('aborted', id);
    completed(new Error('Aborted'));
  };
};