I have this keyboard site launcher script, which I copied from some place years ago and it works fine as is. I want to enhance it by adding a cascading keypress launch for some of the keys. Here is my code:
<html><head>
<script language="JavaScript">
<!-- Begin
var key = new Array();
key['a'] = "https://www.arstechnica.com";
key['g'] = "https://www.google.com";
key['s'] = "https://slashdot.org";
key['y'] = "http://www.yahoo.com";
function getKey(keyStroke) {
isNetscape=(document.layers);
eventChooser = (isNetscape) ? keyStroke.which : event.keyCode;
which = String.fromCharCode(eventChooser).toLowerCase();
// alert('['+which+'] key \n has been stroke');
runUrl(which);
}
function runUrl(which) {
for (var i in key)
if (which == i) {window.location = key[i];}
}
document.onkeypress = getKey;
// End -->
</script></head>
<body>
Make a selection<br>
<br>
key['a'] = "https://www.arstechnica.com";
key['g'] = "https://www.google.com";
key['s'] = "https://slashdot.org";
key['y'] = "http://www.yahoo.com";
<br>
<br>
<!-- I solemnly swear this page is coded with vi or notepad.exe depending on the OS being used -->
</body>
</html>
Now, I want to modify the action for pressing the letter "s" to launch a submenu of sorts and ask me to select if I want to go to "Slashdot" or Spotify" for instance. like if I press an "s" second time, it goes to slashdot and if I press "f" for instance, it goes to spotify.
My problem is, I have never programmed in Javascript other than copying and pasting code and changing string values in the code, like here, changing the pressed keys and site URLs.
Any pointers, regarding how to start modifying this code, are greatly appreciated.
to be honest, the code provided is a bit outdated but I keep it so you can see the necessary changes that I made for the menu to be added and to implement the feature it's just a sketch but I will do the job I think from here you can expand, hope this puts you in the right direction
let isopenMenu = true;
const menu = document.getElementById("menu");
function toggleMenu() {
isopenMenu = !isopenMenu;
menu.style.display = isopenMenu ? "block" : "none";
}
var key = new Array();
key["a"] = "https://www.arstechnica.com";
key["g"] = "https://www.google.com";
key["s"] = "https://slashdot.org";
key["y"] = "http://www.yahoo.com";
key["b"] = "http://www.stackoverflow.com";
key["c"] = "http://www.test.com";
const menuSite = ["b", "c", "s"];
function getKey(keyStroke) {
isNetscape = document.layers;
eventChooser = isNetscape ? keyStroke.which : event.keyCode;
which = String.fromCharCode(eventChooser).toLowerCase();
runUrl(which);
}
function runUrl(which) {
for (var i in key)
if (which == i) {
if (which === "s") {
return toggleMenu();
}
if (!isopenMenu && menuSite.includes(which)) {
return;
}
window.location = key[i];
}
}
document.onkeypress = getKey;
window.addEventListener("load", toggleMenu);
<html><head>
<script language="JavaScript">
</script></head>
<body>
Make a selection<br>
<br>
key['a'] = "https://www.arstechnica.com";
key['g'] = "https://www.google.com";
key['s'] = "to toggel menu
key['y'] = "http://www.yahoo.com";
<br>
<br>
<ul id="menu">
<li>key['b'] = "http://www.stackoverflow.com";</li>
<li>key['c'] = "http://www.test.com</li>
</ul>
</body>
</html>
Indeed the code you've provided seems a bit dusted. There's some stuff that isn't done in that way nowadays. Notepad is an editor I still occassionally use though.
Since you've mentioned that you never really used JavaScript it's a bit hard to give you advice. You can do things way more elegant and even improve the look - but I'd say this would just confuse you even more. So let's work on something based on your code.
At the moment the keys and the corresponding targets are stored in an object (yeah, it's an object not an array). We can use a second object - let' say subKey - to store the additional targets upon pressing s.
var key = {};
key.a = "https://www.arstechnica.com";
key.g = "https://www.google.com";
key.s = "subMenu";
key.y = "http://www.yahoo.com";
var subKey = {};
subKey.a = "https://www.stackoverflow.com";
subKey.g = "https://www.startpage.com";
subKey.s = "goBack";
As you can see I've reserved the key s to go to the sub menu and inside the sub menu this button is used to go back to the main menu.
Now instead of hardcoding what the user gets to see on screen, we can iterate over those objects and use the information from there. To do this we need to reserve a html element - I've chosen an empty <div> which acts as some sort of container. As we iterate over the object we construct a string with the keys and it's associated targets and ultimately assign this this to the div's .innerHTML property.
let container = document.getElementById("container");
container.innerHTML = "Make a selection<br><br>";
for (var i in obj) {
container.innerHTML += "key['" + i + "'] = " + obj[i] + "<br>";
}
As the procedure is the same for both objects we just need to wrap it inside a function and pass it a reference to the desired object.
Your runUrl function needs to be modified a bit to take care of the additional options. This is best done with a simple if-else construct. So in pseudo-code:
if choice is subMenu open sub menu
if choice is goBack open main menu
if it's none of the above open a link
If we put everything together, your example looks a little bit like this:
(Just click on 'Run code snippet' and make sure to click somewhere inside the window so it'll have key focus)
<html>
<head>
</head>
<body>
<div id="container">
</div>
</body>
<script type="text/javascript">
var key = {};
key.a = "https://www.arstechnica.com";
key.g = "https://www.google.com";
key.s = "subMenu";
key.y = "http://www.yahoo.com";
var subKey = {};
subKey.a = "https://www.stackoverflow.com";
subKey.g = "https://www.startpage.com";
subKey.s = "goBack";
var currentObj = key;
function getKey(event) {
let which = String.fromCharCode(event.keyCode).toLowerCase();
runUrl(which)
}
function runUrl(which) {
for (var i in currentObj) {
if (which == i) {
if (currentObj[i] != "subMenu") {
if (currentObj[i] != "goBack") {
window.location = currentObj[i];
} else {
populateMenu(key);
}
} else {
populateMenu(subKey);
}
}
}
}
function populateMenu(obj) {
currentObj = obj;
let container = document.getElementById("container");
container.innerHTML = "Make a selection<br><br>";
for (var i in obj) {
container.innerHTML += "key['" + i + "'] = " + obj[i] + "<br>";
}
}
populateMenu(key);
document.onkeypress = getKey;
</script>
</html>
It looks like could achieve this with arbitrary list of sites. If so, you could handle this a little more generically by providing a list of sites and filtering the sites based on keystrokes.
If so, you can achieve it with the following:
const sites = [
'https://www.arstechnica.com',
'https://www.google.com',
'https://mail.google.com',
'https://slashdot.org',
'https://spotify.com',
'http://www.yahoo.com',
];
let matches = sites;
document.getElementById('keys').addEventListener('keyup', event => {
const keys = event.target.value.toLowerCase().split('');
matches = sites
.map(site => ({ site, stripped: site.replace(/^https?:\/\/(www\.)?/i, '')})) // strip out https://wwww. prefix
.filter(site => isMatch(site.stripped, keys))
.map(site => site.site);
if (event.keyCode === 13) {
if (matches.length === 0) {
alert('No matches');
} else if (matches.length === 1) {
alert(`launching ${matches[0]}`);
} else {
alert('More than one match found');
}
matches = sites;
}
document.getElementById('matches').textContent = matches.join(', ');
});
// find sites matching keys
function isMatch(site, keys) {
if (keys.length === 0) return true;
if (site.indexOf(keys[0]) !== 0) return false;
let startIndex = 1;
for (let i = 1; i < keys.length; i++) {
let index = site.indexOf(keys[i], startIndex);
if (index === -1) return false;
startIndex = index + 1;
}
return true;
}
document.getElementById('matches').textContent = matches.join(', ');
<div>Keys: <input type="text" id="keys" autocomplete="off" /> press Enter to launch.</div>
<p>Matches: <span id="matches" /></p>
The key parts to this are:
Define a list of sites you want to handle
Ignore the the https://wwww prefixes which is achieved with site.replace(/^https?:\/\/(www\.)?/i, '')
Implement filter logic (in this case it is the isMatch method) which tries to match multiple keystrokes
For demonstration purposes, I've wired keyup to an input field instead of document so that you can see it in action, and the action is triggered with the enter/return key.
Related
So basically I'm a beginner in JavaScript and HTML and trying to play with functions call on JS that will edit my HTML file.
Now, I'm trying to redirect users to different pages based on their type.
I want to use "onload" function in order to determine the user type and edit the link according to the result.
HTML:
<body onload="what_user()">
<div id="result">zone</div>
</body>
JS file:
function what_user() {
var d = document.getElementById("result");
var user = ""; // get the user type
if (user == "") d.outerHTML = "" + "";
else d.outerHTML = "" + "";
}
I have some problems understanding how to call a function from HTML and use it on JS as well as return values.
Thanks in advance!!!
Don't play with elements as string. Create an element and put it where you want.
function what_user() {
var d = document.getElementById("result");
let a = document.createElement('a')
a.text = 'zone'
var user = ""; // get the user type
if (user == "") a.href = 'admin_index.html'
else {
a.href = 'admin_user.html'
}
d.parentNode.removeChild(d);
document.body.appendChild(a)
}
<body onload="what_user()">
<div id="result">zone</div>
</body>
I am wondering how to take the information from a parsed query string and use it to display on the top of my page. Ignore the window.alert part of the code, I was just using that to verify that the function worked.
For example: If the user had choices of Spring, Summer, Winter, and Fall, whichever they chose would display a a header on the next page. So if (seasonArray[i]) = Fall, I want to transfer that information into the form and display it as a element. I'm sure this is easily done, but I can't figure it out. Thanks, in advance.
function seasonDisplay() {
var seasonVariable = location.search;
seasonVariable = seasonVariable.substring(1, seasonVariable.length);
while (seasonVariable.indexOf("+") != -1) {
seasonVariable = seasonVariable.replace("+", " ");
}
seasonVariable = unescape(seasonVariable);
var seasonArray = seasonVariable.split("&");
for (var i = 0; i < seasonArray.length; ++i) {
window.alert(seasonArray[i]);
}
if (window != top)
top.location.href = location.href
}
<h1 id="DynamicHeader"></h1>
Replace the alert line with:
document.getElementById("DynamicHeader").insertAdjacentHTML('beforeend',seasonArray[i]);
I recently created my own personal portal page to replace iGoogle since it's going to be shuttered later this year. Everything is working fine except that one of the RSS feeds that I'm pulling in outputs urls that look like this: http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNFEguC5pqagsWkkW_y_EjYj9n1bMg&url=http://www.haaretz.com/news/diplomacy-defense/israel-to-un-replace-austrian-peacekeepers-withdrawn-from-golan-1.528305
Which when clicked go to a bad url page. How would I remove the first half of that url so that it only has the part starting from the second http://
Strange, but here the link works fine...
Just realized the issue is that somehow the ampersands are being turned into entities which is breaking the links...
Try this. A generic approach.
function queryString(parameter, url) {
var a = document.createElement("a");
a.href = url;
var loc = decodeURIComponent(a.search.substring(1, a.search.length));
var param_value = false;
var params = loc.split("&");
for (var i = 0; i < params.length; i++) {
param_name = params[i].substring(0, params[i].indexOf('='));
if (param_name == parameter) {
param_value = params[i].substring(params[i].indexOf('=') + 1)
}
}
if (param_value) {
return encodeURIComponent(param_value);
}
else {
return "";
//param not found
}
}
var secondHTTP = queryString("url", 'http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNFEguC5pqagsWkkW_y_EjYj9n1bMg&url=http://www.haaretz.com/news/diplomacy-defense/israel-to-un-replace-austrian-peacekeepers-withdrawn-from-golan-1.528305');
var str = "http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNFEguC5pqagsWkkW_y_EjYj9n1bMg&url=http://www.haaretz.com/news/diplomacy-defense/israel-to-un-replace-austrian-peacekeepers-withdrawn-from-golan-1.528305";
var url = decodeURIComponent(str.split(/https?:/ig).pop());
will result in
"//www.haaretz.com/news/diplomacy-defense/israel-to-un-replace-austrian-peacekeepers-withdrawn-from-golan-1.528305"
or
var url = decodeURIComponent(str.match(/^http.+(http.+)/i)[1]);
will result in
"http://www.haaretz.com/news/diplomacy-defense/israel-to-un-replace-austrian-peacekeepers-withdrawn-from-golan-1.528305"
Edit: Code updated, jsFiddle added
HTML:
<input id="schnitzel" type="text" value="http://www.google.com/http://www.real-foo.bar/" />
<input type="button" onclick="$('#schnitzel').val(window.firstHTTP($('#schnitzel').val()));" value="ยป" />
JavaScript:
window.firstHTTP = function (furl = "") {
var chunked = furl.split("http://");
return (chunked && chunked[2]) ? ("http://" + chunked[2]) : furl;
};
JS-Fiddle:
http://jsfiddle.net/Rm5bU/
TL;DR (Short synopsis):
I have recreated the admin "Add" button in my own project. However, when I hit "save" on the parent form, it is not recognizing the new select element.
Whole Story:
I have that functionality working in my own project... almost. I need help figuring out the last step. As it is now, I have a "+" button, I click it, a popup shows up, I add a new object, hit save, popup closes and that new item is now in my select box and selected - just like the admin page. However, when I hit save on this parent form, I get the error that I've selected an item not in the list. Of course, since the page has reloaded, my new item is part of the list and I just hit save again and it works. Of course, I need it to save on the first time!
The basic setup is my Parent model is called System and the foreign key model is called Zone. The Zone model lists how many zones a system has (1 zone,2 zones,10 zones, etc...)
OK, some code:
The "Add" link in the template of the parent form:
Add
In my New_Zone view, after saving the new zone, I check if the popup GET variable is 1, if so, return a javascript function. Here's the view:
...
if form.is_valid():
f = form.save(commit=False)
pk_value = f.numOfZones
form.save()
obj = Zone_Info.objects.get(numOfZones=pk_value)
if isPopup == "1":
return HttpResponse('<script>opener.closeAddPopup(window, "%s", "%s");</script>' % (escape(pk_value), escape(obj)))
...
And here is my Javascript (largely copied from the admin javascript:
function html_unescape(text) {
// Unescape a string that was escaped using django.utils.html.escape.
text = text.replace(/</g, '<');
text = text.replace(/>/g, '>');
text = text.replace(/"/g, '"');
text = text.replace(/'/g, "'");
text = text.replace(/&/g, '&');
return text;
}
function windowname_to_id(text) {
text = text.replace(/__dot__/g, '.');
text = text.replace(/__dash__/g, '-');
return text;
}
function showAddPopup(triggeringLink, pWin) {
var name = triggeringLink.id.replace(/^add_/, '');
href = triggeringLink.href;
var win = window.open(href, name, 'height=500,width=800,resizable=yes,scrollbars=yes');
win.focus();
return false;
}
function closeAddPopup(win, newID, newRepr) {
newID = html_unescape(newID);
newRepr = html_unescape(newRepr);
var name = windowname_to_id(win.name);
var elem = document.getElementById(name);
if (elem) {
if (elem.nodeName == 'SELECT') {
var o = new Option(newRepr, newID);
elem.options[elem.options.length] = o;
o.selected = true;
} else if (elem.nodeName == 'INPUT') {
if (elem.className.indexOf('vManyToManyRawIdAdminField') != -1 && elem.value) {
elem.value += ',' + newID;
} else {
elem.value = newID;
}
}
} else {
var toId = name + "_to";
elem = document.getElementById(toId);
var o = new Option(newRepr, newID);
SelectBox.add_to_cache(toId, o);
SelectBox.redisplay(toId);
}
win.close();
}
I took a look at this question and it seems that I am doing precisely the same thing.
Any ideas on how to get that last step of getting the form to recognize the new select element?
Thanks!
I Figured it Out
The problem was what I was passing to my closeAddPopup javascript function. Essentially, I was passing garbage values.
Here's what I originally had in my New_Zone view (which didn't work):
...
if form.is_valid():
f = form.save(commit=False)
pk_value = f.numOfZones
form.save()
obj = Zone_Info.objects.get(numOfZones=pk_value)
if isPopup == "1":
return HttpResponse('<script>opener.closeAddPopup(window, "%s", "%s");</script>' % (escape(pk_value), escape(obj)))
...
It's a pretty stupid mistake on my part (clearly it's late). I was assigning f to the field numOfZones which I thought was the pk and sending that to the script.
Now, the working view looks like this:
if form.is_valid():
obj = form.save()
pk_value = obj.pk
if "_popup" in request.REQUEST:
return HttpResponse('<script>opener.closeAddPopup(window, "%s", "%s");</script>' % (escape(pk_value), escape(obj)))
Anyway... thanks to... well, Stackoverflow. I don't think I would have solved the problem without posting the question and rereading my code on stackoverflow.
I wrote simplest extension as an exercise in JS coding. This extension checks if some user (of certain social network) is online, and then outputs his/her small image, name and online status in notification alert. It checks profile page every 2 minutes via (setTimeout), but when user becomes "online", i set setTimeout to 45 minutes.(to avoid online alerts every 2 minutes).
It works, but not exactly as i expected. I have 2 issues:
1)When certain user is online and i change user id (via options page) to check another one, it doesnt happen because it waits 45 or less minutes. i tried the following code (in options.html), but it doesnt help.
2)When i change users, image output doesnt work correctly!! It outputs image of previous user!!
How do i fix these problems??
Thanks!
options.html
<script>
onload = function() {
if (localStorage.id){
document.getElementById("identifier").value = localStorage.id;
}
else {
var el = document.createElement("div");
el.innerHTML = "Enter ID!!";
document.getElementsByTagName("body")[0].appendChild(el);
}
};
function onch(){
localStorage.id = document.getElementById("identifier").value;
var bg = chrome.extension.getBackgroundPage();
if(bg.id1){
clearTimeout(bg.id1);
bg.getdata();
}
}
</script>
<body>
<h1>
</h1>
<form id="options">
<h2>Settings</h2>
<label><input type='text' id ='identifier' value='' onchange="onch()"> Enter ID </label>
</form>
</body>
</html>
backg.html
<script type="text/javascript">
var domurl = "http://www.xxxxxxxxxxxxxx.xxx/id";
var txt;
var id1;
var id2;
var imgarres = [];
var imgarr = [];
var imgels = [];
function getdata() {
if (id1){clearTimeout(id1);}
if (id2){clearTimeout(id2);}
var url = getUrl();
var xhr = new XMLHttpRequest();
xhr.open('GET',url, true);
xhr.setRequestHeader('Cache-Control', 'no-cache');
xhr.setRequestHeader('Pragma', 'no-cache');
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
txt = xhr.responseText;
var r = txt.indexOf('<b class="fl_r">Online</b>');
var el = document.createElement("div");
el.innerHTML = txt;
var n = imgprocess(el,url);
var nam = el.getElementsByTagName("title")[0].innerHTML;
if (r != -1) {
var notification = webkitNotifications.createNotification(n, nam, 'online!!' );
notification.show();
var id1 = setTimeout(getdata, 60000*45);
}
else {
var id2 = setTimeout(getdata, 60000*2);
}
}}
xhr.send();
}
function imgprocess(text,url){
imgels = text.getElementsByTagName("IMG");
for (var i=0;i< imgels.length;i++){
if (imgels[i].src.indexOf(parse(url)) != -1){
imgarr.push(imgels[i]);
}
}
for (var p=0; p< imgarr.length; p++){
if (imgarr[p].parentNode.nodeName=="A"){
imgarres.push(imgarr[p]);
}
}
var z = imgarres[0].src;
return z;
}
function getUrl(){
if (localStorage.id){
var ur = domurl + localStorage.id;
return ur;
}
else {
var notif = webkitNotifications.createNotification(null, 'blah,blah,blah', 'Enter ID in options!!' );
notif.show();
getdata();
}
}
function init() {
getdata();
}
</script>
</head>
<body onload="init();">
</body>
</html>
In options instead of clearTimeout(bg.id1); try bg.clearTimeout(bg.id1);
For image problem looks like you never clean imgarres array, only adding elements to it and then taking the first one.
PS. You code is very hard to read, maybe if you made it well formatted and didn't use cryptic variable names you would be able to find bugs easier.
UPDATE
I think I know what the problem is. When you are setting the timeout you are using local scope variable because of var keyword, so your id1 is visible only inside this function and global id1 is still undefined. So instead of:
var id1 = setTimeout(getdata, 60000*45);
try:
id1 = setTimeout(getdata, 60000*45);
Because of this if(bg.id1){} inside options is never executed.
(bg.clearTimeout(bg.id1); should work after that, but it is not needed as you are clearing the timeout inside getdata() anyway)