我想制作一个 chrome 扩展，作为浏览器窗口的面纱。用户访问网站的次数越多，他们的历史记录就越多。我看过一些 chrome 扩展程序，但它们似乎都链接到一个图标，每次你访问一个新站点时，弹出窗口都会消失。基于图标的解决方案会很好，但我似乎无法弄清楚如何保持盒子向上以及如何使盒子透明(没有白色背景，只有文本)。我搞乱的示例扩展可以在这里找到...
http://developer.chrome.com/extensions/examples/api/history/showHistory.zip
这是我现在缺少的一些代码。我可以在浏览器上抛出一个 div，但是当我尝试结合上面代码的扩展时，事情就出错了……除了基本的 js 和处理之外，我不是很流利，但我没有看到任何错误或矛盾。 ..建议？
内容.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);
});
最佳答案
您的代码有两个问题:
在合并这两段代码时，您确实搞砸了，导致内容脚本无法正常运行。
您正在尝试从内容脚本的上下文访问
historyAPI，但它仅可用于后台页面(或与此相关的任何扩展 View )。一种解决方案是通过 Message Passing 在内容脚本和背景页面之间进行通信.
下面是解决这两个问题的示例扩展的源代码:
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);
});
关于css - 实验性 chrome 历史扩展，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20503238/