50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
/* globals window */
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module.exports = function layer0(frame) {
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var getuid = (function (i) {
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return function () {
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return i += 1;
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};
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})(1);
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var origin = new URL(frame.getAttribute('src')).origin;
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var handlers = {};
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var listener = null;
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window.addEventListener('message', function (event) {
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if (event.origin !== origin) {
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return;
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}
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if (!event.data || !event.data.uid) {
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if (event.data.event) {
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return listener && listener(event.data);
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}
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return;
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}
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var handler = handlers[event.data.uid];
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if (!handler) {
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return;
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}
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delete handlers[event.data.uid];
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handler(event.data.error, event.data.data);
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});
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function call(method, options, cb) {
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var uid = getuid();
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var data = {uid, method, options};
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handlers[uid] = cb;
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frame.contentWindow.postMessage(data, origin);
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}
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function listen(fn) {
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if (listener) {
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return false;
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}
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listener = fn;
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return true;
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}
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return {
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call: call,
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listen: listen
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};
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};
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