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// Documentation of methods used here are at:
// https://developer.mozilla.org/en-US/Add-ons/Code_snippets/Interaction_between_privileged_and_non-privileged_pages
var pktPanelMessaging = (function() {
function panelIdFromURL(url) {
var panelId = url.match(/panelId=([\w|\d|\.]*)&?/);
if (panelId && panelId.length > 1) {
return panelId[1];
}
return 0;
}
function prefixedMessageId(messageId) {
return "PKT_" + messageId;
}
function panelPrefixedMessageId(panelId, messageId) {
return prefixedMessageId(panelId + "_" + messageId);
}
function addMessageListener(panelId, messageId, callback) {
document.addEventListener(
panelPrefixedMessageId(panelId, messageId),
function(e) {
callback(JSON.parse(e.target.getAttribute("payload"))[0]);
// TODO: Figure out why e.target.parentNode is null
// e.target.parentNode.removeChild(e.target);
}
);
}
function removeMessageListener(panelId, messageId, callback) {
document.removeEventListener(
panelPrefixedMessageId(panelId, messageId),
callback
);
}
function sendMessage(panelId, messageId, payload, callback) {
// Payload needs to be an object in format:
// { panelId: panelId, data: {} }
var messagePayload = {
panelId,
data: payload || {},
};
// Create a callback to listen for a response
if (callback) {
var messageResponseId = messageId + "Response";
var responseListener = function(responsePayload) {
callback(responsePayload);
removeMessageListener(panelId, messageResponseId, responseListener);
};
addMessageListener(panelId, messageResponseId, responseListener);
}
// Send message
var element = document.createElement("PKTMessageFromPanelElement");
element.setAttribute("payload", JSON.stringify([messagePayload]));
document.documentElement.appendChild(element);
var evt = document.createEvent("Events");
evt.initEvent(prefixedMessageId(messageId), true, false);
element.dispatchEvent(evt);
}
/**
* Public functions
*/
return {
panelIdFromURL,
addMessageListener,
removeMessageListener,
sendMessage,
};
})();
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