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script.js
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script.js
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var server = 'http://linkback.herokuapp.com';
// var server = 'http://localhost:1666';
var homeSiteUrl = "http://linkback.herokuapp.com";
var seomozUrl = "http://seomoz.org";
var seomozIconUrl = homeSiteUrl + "/linkscape.png";
// var homeIconUrl = "http://hyperphor.com/hyperphor-tiny.png";
var openclose;
var pageUrl;
var pane; // contents pane
var savedResults;
function doPopup() {
pageUrl = document.location.href;
if (!blockUrl(pageUrl)) {
doQuery(pageUrl);
}
}
function makeQueryUrl(pageUrl) {
return server + '/linkback-srv?page=' + encodeURIComponent(pageUrl);
}
function makeMoreUrl(pageUrl) {
return server + '/linkback.html?page=' + encodeURIComponent(pageUrl);
}
function blockUrl(pageUrl) {
return !(pageUrl.substring(0, 4) == "http");
}
function doQuery(pageUrl) {
var xhr = new XMLHttpRequest();
xhr.open("GET", makeQueryUrl(pageUrl), true);
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
if (xhr.status = 200) {
// WARNING! Might be evaluating an evil script!
var results = eval("(" + xhr.responseText + ")");
showResults(results);
}
else {
insertError(xhr.status, xhr.statusText);
}
}
};
xhr.send();
}
function ifOpen(yes, no) {
chrome.extension.sendMessage({cmd:"isOpen"}, function(response) {
if (response)
yes.call();
else
no.call();
});
}
function invertOpen() {
chrome.extension.sendMessage({cmd:"switchOpen"}, function(response) {
});
}
function setOpen(nv) {
chrome.extension.sendMessage({cmd:"setOpen",value: nv}, function(response) {
});
}
function showResults(results) {
if (results != null && results.length > 0) {
savedResults = results;
ifOpen(function () { showResultsOpen(results); },
function () { showResultsClosed(results); });
}
}
function showResultsOpen(results) {
makeWindow();
var ul = document.createElement('ul');
ul.setAttribute('id', 'linkback_ul');
pane.appendChild(ul);
for (var i=0; i<results.length; i++) {
var result = results[i];
insertLink(result.url, result.title);
}
if (results.length > 0) {
insertEndMatter(pageUrl, results);
}
}
function openCloseHandler() {
var open = invertOpen();
pane.innerHTML = '';
showResults(savedResults);
}
function makeWindow() {
if (pane == null) {
addStyleLink(chrome.extension.getURL("reset.css"));
addStyleLink(chrome.extension.getURL("linkback.css"));
var body = document.getElementsByTagName('body')[0];
var div = document.createElement('div');
div.setAttribute('id', 'LinkBack');
div.setAttribute('class', 'linkback');
pane=document.createElement('div');
pane.setAttribute('class','linkbackinner');
div.appendChild(pane);
body.appendChild(div);
}
return pane;
}
function insertOpenClose() {
openclose = document.createElement('div');
openclose.setAttribute('class', 'linkbackopener');
opencloseUpdate();
openclose.addEventListener('click', openCloseHandler, true);
return openclose;
}
function insertLink(url, title) {
var container = document.getElementById('linkback_ul');
var li = document.createElement('li');
container.appendChild(li);
insertLinkAny(li, url, title);
}
function insertLinkAny(container, url, title) {
var link = document.createElement('a');
link.setAttribute('href', url);
insertText(link, title);
container.appendChild(link);
return link;
}
// need a graphic, but ok for now
// misnamed for it does not actually show results.
function showResultsClosed(results) {
makeWindow();
insertEndMatter(null, null);
}
// if results is null, this is a closed view
function insertEndMatter(pageUrl, results) {
var div = document.createElement('div');
div.setAttribute('class','linkbackfooter');
pane.appendChild(div);
if (results && results.length >= 20) { // limit imposed by server
var link = insertLinkAny(div, makeMoreUrl(pageUrl), "More");
link.setAttribute('class','linkbackmore');
}
insertLinkAny(div, homeSiteUrl, "Linkback");
insertText(div, ' ');
if (results) {
var img = insertImgLink(div, seomozIconUrl, seomozUrl);
img.setAttribute('class','linkbackseo');
}
// additional opener -- not quite the right thing but better than nothing for now.
var opener = insertOpenClose();
div.appendChild(opener);
}
function insertText(container, text) {
var node = document.createTextNode(unescapeHTML(text));
container.appendChild(node);
}
// borrowed from Prototype
function unescapeHTML(text) {
var div = document.createElement('div');
div.innerHTML = text;
return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
}
function insertError(code, msg) {
var container = document.getElementById('linkback_ul');
insertText(container, 'Error: ' + code + ': ' + msg);
}
function insertImgLink(container, imgUrl, linkUrl) {
var link = document.createElement('a');
if (linkUrl) link.setAttribute('href', linkUrl);
var img = document.createElement('img');
img.setAttribute('src', imgUrl);
img.setAttribute('border', '0');
img.setAttribute('style', 'vertical-align: middle');
link.appendChild(img);
container.appendChild(link);
return link;
}
function insertImg(container, imgUrl) {
var img = document.createElement('img');
img.setAttribute('src', imgUrl);
img.setAttribute('border', '0');
img.setAttribute('style', 'vertical-align: middle');
container.appendChild(img);
return img;
}
function opencloseUpdate() {
openclose.innerHTML = ''
ifOpen(function () { insertImg(openclose, chrome.extension.getURL("down.png")); },
function () { insertImg(openclose, chrome.extension.getURL("up.png")); });
}
function addStyleLink(href) {
var head, link;
head = document.getElementsByTagName('head')[0];
if (!head) { head = document.getElementsByTagName('body')[0]; } // headless body found in topless bar
if (!head) { return; }
link = document.createElement('link');
link.type = 'text/css';
link.rel = 'stylesheet';
link.media = 'all';
link.href = href;
head.appendChild(link);
}
doPopup();