问题
I managed to build Ripple Emulator open source (https://github.com/apache/incubator-ripple).
I built it per the instructions (Jake build), which create the Chrome Extension Target that allows me to test my web apps via a chrome extension of my built, as per https://github.com/apache/incubator-ripple/blob/master/doc/chrome_extension.md.
I successfully loaded the unpacked extension onto chrome, but when I enable it nothing happens, though the page reloads the extension does not work, instead I get 2 errors:
Uncaught ReferenceError: webkitNotifications is not defined
webkitNotifications.createHTMLNotification('/views/update.html').show();Unchecked runtime.lastError while running tabs.executeScript: Cannot access a chrome:// URL
chrome.tabs.executeScript(tabId, {
How do I solve this problem?
Full background.js:
if (!window.tinyHippos) {
window.tinyHippos = {};
}
tinyHippos.Background = (function () {
var _wasJustInstalled = false,
_self;
function isLocalRequest(uri) {
return !!uri.match(/^https?:\/\/(127\.0\.0\.1|localhost)|^file:\/\//);
}
function initialize() {
// check version info for showing welcome/update views
var version = window.localStorage["ripple-version"],
xhr = new window.XMLHttpRequest(),
userAgent,
requestUri = chrome.extension.getURL("manifest.json");
_self.bindContextMenu();
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
var manifest = JSON.parse(xhr.responseText),
currentVersion = manifest.version;
if (!version) {
_wasJustInstalled = true;
}
if (version !== currentVersion) {
webkitNotifications.createHTMLNotification('/views/update.html').show();
}
window.localStorage["ripple-version"] = currentVersion;
}
};
xhr.open("GET", requestUri, true);
xhr.send();
chrome.extension.onRequest.addListener(function (request, sender, sendResponse) {
switch (request.action) {
case "isEnabled":
console.log("isEnabled? ==> " + request.tabURL);
sendResponse({"enabled": tinyHippos.Background.isEnabled(request.tabURL)});
break;
case "enable":
console.log("enabling ==> " + request.tabURL);
tinyHippos.Background.enable();
sendResponse();
break;
case "version":
sendResponse({"version": version});
break;
case "xhr":
var xhr = new XMLHttpRequest(),
postData = new FormData(),
data = JSON.parse(request.data);
console.log("xhr ==> " + data.url);
$.ajax({
type: data.method,
url: data.url,
async: true,
data: data.data,
success: function (data, status) {
sendResponse({
code: 200,
data: data
});
},
error: function (xhr, status, errorMessage) {
sendResponse({
code: xhr.status,
data: status
});
}
});
break;
case "userAgent":
case "lag":
case "network":
// methods to be implemented at a later date
break;
default:
throw {name: "MethodNotImplemented", message: "Requested action is not supported!"};
break;
};
});
chrome.tabs.onUpdated.addListener(function (tabId, changeInfo, tab) {
if (tinyHippos.Background.isEnabled(tab.url)) {
chrome.tabs.executeScript(tabId, {
code: "rippleExtensionId = '" + chrome.extension.getURL('') + "';",
allFrames: false
}, function () {
chrome.tabs.executeScript(tabId, {
file: "bootstrap.js",
allFrames: false
});
});
}
});
}
function _getEnabledURIs() {
var parsed = localStorage["tinyhippos-enabled-uri"];
return parsed ? JSON.parse(parsed) : {};
}
function _persistEnabled(url) {
var jsonObject = _getEnabledURIs();
jsonObject[url.replace(/.[^\/]*$/, "")] = "widget";
localStorage["tinyhippos-enabled-uri"] = JSON.stringify(jsonObject);
}
_self = {
metaData: function () {
return {
justInstalled: _wasJustInstalled,
version: window.localStorage["ripple-version"]
};
},
bindContextMenu: function () {
var id = chrome.contextMenus.create({
"type": "normal",
"title": "Emulator"
});
// TODO: hack for now (since opened tab is assumed to be page context was called from
// eventually will be able to pass in data.pageUrl to enable/disable when persistence refactor is done
chrome.contextMenus.create({
"type": "normal",
"title": "Enable",
"contexts": ["page"],
"parentId": id,
"onclick": function (data) {
_self.enable();
}
});
chrome.contextMenus.create({
"type": "normal",
"title": "Disable",
"contexts": ["page"],
"parentId": id,
"onclick": function (data) {
_self.disable();
}
});
},
enable: function () {
chrome.tabs.getSelected(null, function (tab) {
console.log("enable ==> " + tab.url);
_persistEnabled(tab.url);
chrome.tabs.sendRequest(tab.id, {"action": "enable", "mode": "widget", "tabURL": tab.url });
});
},
disable: function () {
chrome.tabs.getSelected(null, function (tab) {
console.log("disable ==> " + tab.url);
var jsonObject = _getEnabledURIs(),
url = tab.url;
while (url && url.length > 0) {
url = url.replace(/.[^\/]*$/, "");
if (jsonObject[url]) {
delete jsonObject[url];
break;
}
}
localStorage["tinyhippos-enabled-uri"] = JSON.stringify(jsonObject);
chrome.tabs.sendRequest(tab.id, {"action": "disable", "tabURL": tab.url });
});
},
isEnabled: function (url, enabledURIs) {
if (url.match(/enableripple=/i)) {
_persistEnabled(url);
return true;
}
// HACK: I'm sure there's a WAY better way to do this regex
if ((url.match(/^file:\/\/\//) && url.match(/\/+$/)) || url.match(/(.*?)\. (jpg|jpeg|png|gif|css|js)$/)) {
return false;
}
enabledURIs = enabledURIs || _getEnabledURIs();
if (url.length === 0) {
return false;
}
else if (enabledURIs[url]) {
return true;
}
return tinyHippos.Background.isEnabled(url.replace(/.[^\/]*$/, ""), enabledURIs);
}
};
initialize();
return _self;
}());
Full manifest.json:
{
"version": "1",
"manifest_version": 2,
"name": "Ripple Emulator (Beta)",
"background": {
"page": "views/background.html"
},
"web_accessible_resources": [],
"icons":{
"16":"images/Icon_16x16.png",
"128":"images/Icon_128x128.png",
"48":"images/Icon_48x48.png"
},
"browser_action":{
"default_popup":"views/popup.html",
"default_icon":"images/Icon_48x48.png",
"default_title":"Ripple"
},
"content_scripts":[{
"run_at": "document_start",
"js": ["controllers/Insertion.js"],
"matches": ["http://*/*","https://*/*","file://*"]
},
{
"run_at": "document_start",
"js": ["controllers/frame.js"],
"matches": ["http://*/*","https://*/*","file://*"],
"all_frames": true
}],
"permissions": ["tabs", "unlimitedStorage", "notifications", "contextMenus", "webRequest", "<all_urls>"],
"description": "A browser based html5 mobile application development and testing tool"
}
回答1:
Both of these errors explain the problem well:
"webkitNotifications is not defined" - this is because webkitNotifications has been removed. I found Chrome webkitNotification not found : api missing which explains what is going on.
"Cannot access a chrome:// URL" - you must be trying to execute the script on a chrome:// URL (like chrome://settings, chrome://extensions) which is illegal. To avoid the error printing like that, you can either - check chrome.runtime.lastError - make sure not to inject onto chrome:// pages.
回答2:
"Check" runtime.lastError by "reading" it in the callback.
Code
chrome.tabs.executeScript(tabId, {
//..
}, _=>chrome.runtime.lastError /* "check" error */)
Eg
Show it via..
chrome.tabs.executeScript(tabId, {
//..
}, _=>{
let e = chrome.runtime.lastError;
if(e !== undefined){
console.log(tabId, _, e);
}
});
来源：https://stackoverflow.com/questions/26517988/unchecked-runtime-lasterror-while-running-tabs-executescript