I wanted to make a chrome extension that acted as a veil over the browser window. The more the user visited a websites the more filled a the veil would be with their history. I have looked at some chrome extensions, but they all seem linked to an icon and every time you visit a new site the pop up disappears. A icon based solution would be fine, but I can't seem to figure out how to keep the box up and how to make the box transparent(no white background, just text). The sample extension I was messing with can be found here...
http://developer.chrome.com/extensions/examples/api/history/showHistory.zip
here is some of the code I am missing with now. I am able to throw a div over the browser, but when I try to combine the extension from above's code things go awry...I am not extremely fluent beyond basic js and processing, but I don't see anything wrong or contradictory...Advice?
content.js
function createHistoryDiv() {
var divHeight = 97;
var divMargin = 10;
var div = document.createElement("div");
div.id = "history";
var st = div.style;
st.display = "block";
st.zIndex = "10000000";
st.top = "0px";
st.left = "0px";
st.right = "0px";
st.height = divHeight + "%";
st.background = "rgba(255, 255, 255, .01)";
st.margin = divMargin + "px";
st.padding = "5px";
st.border = "5px solid black";
st.color = "black";
st.fontFamily = "Arial,sans-serif";
st.fontSize = "36";
st.position = "fixed";
st.overflow = "hidden";
st.boxSizing = "border-box";
st.pointerEvents = "none";
document.documentElement.appendChild(div);
var heightInPixels = parseInt(window.getComputedStyle(div).height);
st.height = heightInPixels + 'px';
//document.body.style.webkitTransform = "translateY("
//+ (heightInPixels + (2 * divMargin))+ "px)";
return div;
}
function buildDivContent(historyDiv, data) {
var ul = document.createElement('ul');
historyDiv.appendChild(ul);
for (var i = 0, ie = data.length; i < ie; ++i) {
var a = document.createElement('a');
a.href = data[i];
a.appendChild(document.createTextNode(data[i]));
var li = document.createElement('li');
li.style.color = "black";
li.style.display = "inline";
li.style.wordBreak = "break all";
li.appendChild(a);
a.style.color = "black";
a.style.fontSize = "24px";
a.style.linkDecoration = "none";
ul.appendChild(li);
}
}
chrome.runtime.sendMessage({ action: "buildTypedUrlList" }, function(data) {
var historyDiv = createHistoryDiv();
buildDivContent(historyDiv, data);
});
function logoDiv(){
var div2 = document.createElement("div");
div2.id = "logo";
var st = div2.style;
st.display = "block";
st.zIndex = "10000001";
st.bottom = "0px";
//st.left = "0px";
st.right = "0px";
st.height = "42px";
st.width = "210px";
st.background = "rgba(255, 255, 255,1)";
st.padding = "5px";
st.margin = "10px";
st.border = "5px solid black";
st.color = "black";
st.fontFamily = "Arial,sans-serif";
st.position = "fixed";
st.overflow = "hidden";
st.boxSizing = "border-box";
//st.pointerEvents = "none";
document.documentElement.appendChild(div2);
div2.innerHTML = div2.innerHTML + "<a href=\"#\" onclick=\"toggle_visibility(\"logo\");\" style = \"display:block;font-size:24px;margin:0;padding:0;color: black;\">TRANSPARENCY</a>";
return div2;
function toggle_visibility(id) {
var e = document.getElementById("logo");
if(e.style.display == "block")
e.style.display = "hidden";
else
e.style.display = "block";
}
}
chrome.runtime.sendMessage({ action: "buildTypedUrlList" }, function(data){
var titleDiv = logoDiv();
buildDivContent(titleDiv);
});
There are two problems with your code:
You have really messed things up while merging the two pieces of code, resulting in a non-functional content-script.
You are trying to access the history API from the context of a content-script, but it is only available to the background-page (or any extension view for that matter). One solution is to communicate between the content-script and the background-page through Message Passing.
Below is the source code of a sample extension that takes care of both problems:
mannifest.json:
{
"manifest_version": 2,
"name": "Test Extension",
"version": "0.0",
"offline_enabled": false,
"background": {
"persistent": false,
"scripts": ["background.js"]
},
"content_scripts": [{
"matches": ["*://*/*"],
"js": ["content.js"],
"run_at": "document_idle",
"all_frames": false
}],
"permissions": [
"history"
]
}
background.js:
// Search history to find up to ten links that a user has typed in,
// and show those links in a popup.
function buildTypedUrlList(callback) {
// To look for history items visited in the last week,
// subtract a week of microseconds from the current time.
var millisecondsPerWeek = 1000 * 60 * 60 * 24 * 7;
var oneWeekAgo = new Date().getTime() - millisecondsPerWeek;
// Track the number of callbacks from chrome.history.getVisits()
// that we expect to get. When it reaches zero, we have all results.
var numRequestsOutstanding = 0;
chrome.history.search({
'text': '', // Return every history item....
'startTime': oneWeekAgo // that was accessed less than one week ago.
},
function(historyItems) {
// For each history item, get details on all visits.
for (var i = 0; i < historyItems.length; ++i) {
var url = historyItems[i].url;
var processVisitsWithUrl = function(url) {
// We need the url of the visited item to process the visit.
// Use a closure to bind the url into the callback's args.
return function(visitItems) {
processVisits(url, visitItems);
};
};
numRequestsOutstanding++;
chrome.history.getVisits({url: url}, processVisitsWithUrl(url));
}
if (!numRequestsOutstanding) {
onAllVisitsProcessed();
}
});
// Maps URLs to a count of the number of times the user typed that URL into
// the omnibox.
var urlToCount = {};
// Callback for chrome.history.getVisits(). Counts the number of
// times a user visited a URL by typing the address.
var processVisits = function(url, visitItems) {
for (var i = 0, ie = visitItems.length; i < ie; ++i) {
// Ignore items unless the user typed the URL.
if (visitItems[i].transition != 'typed') { // <-- modify to allow different
// types of transitions
continue;
}
if (!urlToCount[url]) {
urlToCount[url] = 0;
}
urlToCount[url]++;
}
// If this is the final outstanding call to processVisits(),
// then we have the final results. Use them to build the list
// of URLs to show in the popup.
if (!--numRequestsOutstanding) {
onAllVisitsProcessed();
}
};
// This function is called when we have the final list of URls to display.
var onAllVisitsProcessed = function() {
// Get the top scorring urls.
urlArray = [];
for (var url in urlToCount) {
urlArray.push(url);
}
// Sort the URLs by the number of times the user typed them.
urlArray.sort(function(a, b) {
return urlToCount[b] - urlToCount[a];
});
callback(urlArray.slice(0, 10));
};
}
chrome.runtime.onMessage.addListener(function(msg, sender, callback) {
if (msg.action === 'buildTypedUrlList') {
buildTypedUrlList(callback);
return true;
}
return false;
});
content.js:
function createHistoryDiv() {
var divHeight = 25;
var divMargin = 10;
var div = document.createElement("div");
var st = div.style;
st.display = "block";
st.zIndex = "10";
st.top = "0px";
st.left = "0px";
st.right = "0px";
st.height = divHeight + "%";
st.background = "rgba(255, 255, 255, .5)";
st.margin = divMargin + "px";
st.padding = "5px";
st.border = "5px solid black";
st.color = "black";
st.fontFamily = "Arial, sans-serif";
st.fontStyle = "bold";
st.position = "fixed";
st.overflow = 'auto';
st.boxSizing = "border-box";
document.documentElement.appendChild(div);
var heightInPixels = parseInt(window.getComputedStyle(div).height);
st.height = heightInPixels + 'px';
document.body.style.webkitTransform = "translateY("
+ (heightInPixels + (2 * divMargin))+ "px)";
return div;
}
function buildDivContent(historyDiv, data) {
var ul = document.createElement('ul');
historyDiv.appendChild(ul);
for (var i = 0, ie = data.length; i < ie; ++i) {
var a = document.createElement('a');
a.href = data[i];
a.appendChild(document.createTextNode(data[i]));
var li = document.createElement('li');
li.appendChild(a);
ul.appendChild(li);
}
}
chrome.runtime.sendMessage({ action: "buildTypedUrlList" }, function(data) {
var historyDiv = createHistoryDiv();
buildDivContent(historyDiv, data);
});