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Even with the inline JavaScript function - Google ReCAPTCHA couldn't find user-provided function: function (response) -

I am using ReCAPTCHA version V2. On the callback function (i.e. data-callback), I am getting the following error message.
ReCAPTCHA couldn't find user-provided function: function (response)
Now, most of the posts/solutions I see on the web are related to a local callback function that doesn't get invoked when referred in data-callback attribute of the g-recaptcha div. However, in my case, even the inline function does not get invoked. Please have a look at the following image.
Screenshot-1:
In fact, when I am using JavaScript native function such as alert(), it is still not working.
Screenshot-2:
Here's the JS code I am using.
<script src='https://www.google.com/recaptcha/api.js'></script>
First try - callback function:
<div class="g-recaptcha" data-sitekey="Please add your site key if you want to test" data-callback="function (response) { alert('working: ', response);}"></div>
Second try - callback function:
<div class="g-recaptcha" data-sitekey="Please add your site key if you want to test" data-callback="Window.alert('hi');"></div>
I appreciate your help if you can help me understand why is the google API responding in a completely weird way.

Inline JavaScript function in Google ReCAPTCHA will never work.
If it could save somebody's time, I am posting his answer here.
All credit goes to #Christos Lytras. Many thanks to him for helping me understand the JS behind the Google ReCAPTCHA. What he said in the comment section about Recaptcha's JS tries to identify the function by its name in the global window object, is absolutely correct. Thus, my implementation was not working and will never work (at least in the V2 version).
In all my solutions when I was trying to implement an inline function, it was read as the window[function (){}]or window[Window.alert('hi');] which is incorrect JS syntax. Therefore, when I tried it the following way, it worked like charm.
Correct approach
<script>window.myCallBackFunction = function() { alert("HI"); }</script>
<script src='https://www.google.com/recaptcha/api.js'></script>
<div class="g-recaptcha" data-sitekey="XXX" data-callback="myCallBackFunction" ></div>
Please note: Just for more clarity, I have also tried implementing the callback function initially before posting this question and it didn't work because of the order of the scripts. Thanks to this answer on another question that helped me immensely but after #Christos Lytras's explaination. In the beginning, I was implementing it in the following order.
Incorrect approach
<script src='https://www.google.com/recaptcha/api.js'></script>
<script>window.myCallBackFunction = function() { alert("HI"); }</script>
<div class="g-recaptcha" data-sitekey="XXX" data-callback="myCallBackFunction" ></div>
I hope it could help somebody like me, in the future.

window.location.href not working when "isset['buttonname']" is occurring (php js)

As the title says (window.location.href not working when “isset['buttonname']” is occurring (php js)), my page is not redirecting to my new page that I want it to go to. I have tried using :
     window.location.href = 'reviewer.php';
    </script>
and have also tried using
echo "<script> location.href='http://gwupyterhub.seas.gwu.edu/~rkanungo/clout_computing/reviewer.php'; </script>";
Neither one of these scripts are being executed, and I insert them earlier in my code to see if they would even be executed and still nothing, even right after the initial if clause. Any suggestions?

I suggest that you try the Javascript document ready function with window.location.replace(), for example.
<script type="text/javascript">
(function() {
window.location.replace("https://example.com");
})();
</script>
Alternatively you can only use the window.location.replace() function if the above doesn't work.
The PHP header() function must be called before any actual output, for example "echo".

Sorry folks, I figured it out. Was simply not on the correct url while changing and none of my changes were showing up. Thank you all though!

jQuery Datepicker okay on first load of a page but fails thereafter

This is the second time I have asked this question. Neither the responses I received initially nor any of the myriad of other answers to similar questions have helped me to solve the problem.
The problem is that once a datepicker object is initialized, a second initialization causes it to fail. I have tried all sorts of blurring and destroying but nothing has worked for me.
Please take a look at this simple page which demonstrates the problem
Here is the javascript for the page that contains the datepicker input elements...
$(document).ready (function(){
sp = " ";
lf = '\n'
$(function (){
$("input#datepicker").datepicker();
$("input#datepicker2").datepicker();
})
})// document ready
I would truly appreciate any help to get this working. I've already spent about eight hours with no success.
Thanks,
-dmd-

Your code is obsolete. you got a document ready function inside of an document ready function ( $(function(){}) is a shorthand of $(document).ready(function(){}). But this isn't the Problem. Use the following code in your divtest.html and remove the calls in datepicker.html:
$(function(){
$(document).on('DOMNodeInserted','input#datepicker,input#datepicker2', function(){
$(this).datepicker();
});
}

Finally, I have a solution and it is simple.
On the datepicker page, before initializing datepicker, add this line
$('#ui-datepicker-div').remove();
then
$("input#datepicker").datepicker();
$("input#datepicker2").datepicker();
This works for me and I truly hope it works for everyone else who has been bogged down with the issue.

JavaScript button fires perfectly in Chrome and IE but won't work in Firefox

I'm sure the title looks like something that's been asked before but I've searched for the answer to this and I can't find it.
I'm really very new to coding, so please excuse any really obvious mistakes I've made.
Context to the code I'm working on: I'm in a Game Design class and I've decided to take up a personal project making an HTML JS game.
I understand that the code is possibly rough / bad / definitely-not-the-best-way-to-do-things, but it will continue to be so until I improve my skills (or am given advice on how to improve it).
What I need help with: For two to three weeks, I could not figure out how to get a button to appear when implemented inside of an if else statement.
Like so:
if(condition)
{
document.write("text");
//desired button here
}
else
{
//Backup code
}
Eventually I figured two ways to do that (for Chrome and Internet Explorer).
First way:
function myFunction()
{
document.close();
document.write("text");
/* There will be buttons in here
too when I get things working. */
}
//In separate script tags
/* myFunction() dwells in the head of the
page while the if statement is in the body
and another function*/
if(condition)
{
document.write("text");
var gameElement=document.createElement("BUTTON");
var text=document.createTextNode("CLICK ME");
gameElement.appendChild(text);
gameElement.onclick = myFunction;
document.body.appendChild(gameElement);
}
else
{
//Backup code
}
The second way:
(The same function, they're both in the same places).
if(condition)
{
document.write("text");
var gameElement;
gameElement = document.createElement('input');
gameElement.id = 'gameButton';
gameElement.type = 'button';
gameElement.value='Continue';
gameElement.onclick = myFunction;
document.body.appendChild(gameElement);
}
This works well for me.
And while it works in IE and Chrome fine, it doesn't work in Firefox.
After how much time and research I've put into just this button, I'd love to know why it won't show up in Firefox. I've read a lot about Firefox and how .onclick won't work or something like JavaScript has to be enabled or disabled. I'm just a bit confused.
I'm also open any real / relevant advice.

I set up this fiddle. I removed your document.write() calls because they're disallowed in JSFiddle, and change your condition to true so the code would work, and it works in FF24.
document.write() might be the cause of your problem. It's bad practice anyway because it can cause a re-parse of a document, or wipe the entire document and start writing it again. You're already using some DOM manipulation to add the button. I suggest you do likewise for anything you're considering using document.write() for.

Instead of suggesting a solution to your problem, I would suggest you take a look at jQuery, which is a very nice JavaScript framework, that makes it possible for you to write cross-browser compatible code, which it seems is your problem here.
Using jQuery, you would be able to write something like:
$("#gameButton").click(function() { myFunction(); }
which would trigger your myFunction() function, when the control with the id 'gameButton' is clicked.
Visit www.jquery.com to learn more

button in jquery and jscript

I am trying to understand the difference between JQuery and JavaScript.
And apologies if this is a silly question.
This is my attempt at JQuery. On pressing the button the text in <p> should change as requested. I cannot get this to work.
http://jsfiddle.net/QaHda/7/
this is my JavaScript attempt. I cannot get this to work either
http://jsfiddle.net/aLhb8/1/
Can someone please help me with
my jQuery above to get it working.
my jscript above to get it working.
I was trying to get to a point where I could write my JQuery in such a way that it could be written in javascript. Can anyone help me do this?
Thanks
EDIT
Thanks for all the answers/corrections: what I was looking for part 3 was this enter link description here which basically does part 1 using javaScript,I think. In future I should be careful,using left hand pane, to include Jquery library and to make sure jsript is wrapped in head/body

jQuery
You need to include jQuery library to your page by selecting a jQuery version in the first dropdown in the left panel
Demo: Fiddle
JS Sample
The problem is since your function is defined within the onload callback, it was not available in the global scope causing an error saying
Uncaught ReferenceError: myFunction is not defined
The solution is to add the script to the body elements, instead of inside the onload callback by selecting No Wrap - in <body> in the second dropdown in the left panel
function myFunction()
{
alert("Hello World!");
}
Demo: Fiddle

jQuery is library of javascript function and you need to add jquery file in html file that y jquery function was not working and for javacript function you need to change the setting in jfiddele left to no-wrap in head
http://jsfiddle.net/aLhb8/1/
http://jsfiddle.net/hushme/QaHda/10/
here is code
$("button").on("click", function () {
$("p").text("this text will now appear!!")
});

If you have internet connection, This should work
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
$(document).ready(function() {
$('button').click(function() {
alert("This is a simple alert message");
});
});
But if don't then just download the jquery framework and include into your page
Hope it helps and anyway jquery is a framework of javascript, so they are both or they are the same. Don't confuse yourself.

Here is a JavaScript version - http://jsfiddle.net/aLhb8/4/
JavaScript
var myButton = document.getElementById('myButton');
myButton.addEventListener('click', function(){
alert(myButton.textContent);
});
Check this link out if you want to start learning more about JavaScript - http://javascriptissexy.com/how-to-learn-javascript-properly/

For the pure JS code, on the top left panel, select 'No wrap - in body'. This will make your code run without a problem.
In the jQuery code, make sure you've selected the jQuery library, as opposed to pure JS. You hadn't selected this before, so your code was invalid.