100 lines
2.4 KiB
JavaScript
100 lines
2.4 KiB
JavaScript
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'use strict';
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var random = require('../../utils/random')
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, urlUtils = require('../../utils/url')
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;
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var debug = function() {};
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if (process.env.NODE_ENV !== 'production') {
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debug = require('debug')('sockjs-client:sender:jsonp');
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}
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var form, area;
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function createIframe(id) {
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debug('createIframe', id);
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try {
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// ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
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return global.document.createElement('<iframe name="' + id + '">');
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} catch (x) {
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var iframe = global.document.createElement('iframe');
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iframe.name = id;
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return iframe;
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}
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}
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function createForm() {
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debug('createForm');
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form = global.document.createElement('form');
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form.style.display = 'none';
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form.style.position = 'absolute';
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form.method = 'POST';
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form.enctype = 'application/x-www-form-urlencoded';
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form.acceptCharset = 'UTF-8';
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area = global.document.createElement('textarea');
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area.name = 'd';
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form.appendChild(area);
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global.document.body.appendChild(form);
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}
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module.exports = function(url, payload, callback) {
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debug(url, payload);
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if (!form) {
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createForm();
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}
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var id = 'a' + random.string(8);
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form.target = id;
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form.action = urlUtils.addQuery(urlUtils.addPath(url, '/jsonp_send'), 'i=' + id);
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var iframe = createIframe(id);
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iframe.id = id;
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iframe.style.display = 'none';
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form.appendChild(iframe);
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try {
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area.value = payload;
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} catch (e) {
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// seriously broken browsers get here
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}
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form.submit();
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var completed = function(err) {
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debug('completed', id, err);
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if (!iframe.onerror) {
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return;
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}
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iframe.onreadystatechange = iframe.onerror = iframe.onload = null;
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// Opera mini doesn't like if we GC iframe
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// immediately, thus this timeout.
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setTimeout(function() {
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debug('cleaning up', id);
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iframe.parentNode.removeChild(iframe);
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iframe = null;
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}, 500);
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area.value = '';
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// It is not possible to detect if the iframe succeeded or
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// failed to submit our form.
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callback(err);
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};
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iframe.onerror = function() {
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debug('onerror', id);
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completed();
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};
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iframe.onload = function() {
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debug('onload', id);
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completed();
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};
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iframe.onreadystatechange = function(e) {
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debug('onreadystatechange', id, iframe.readyState, e);
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if (iframe.readyState === 'complete') {
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completed();
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}
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};
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return function() {
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debug('aborted', id);
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completed(new Error('Aborted'));
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};
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};
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