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jQuery want to override function on button click

I already have a jQuery .on() function in which click event is passed on a button.
I want to restrict user from clicking button more than 1 but i don't want to alter current function instead write new function
$('button').on('click', function() {
alert('hi');
});
$('button').click(function(event) {
var count = 0;
count = count + 1;
if (count > 1) {
event.preventDefault();
console.log('dont call alert');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<button>Click Me !</button>

I think you are looking for something like following.
$('button').on('click', function () {
alert('hi');
});
var isCliked = true;
$('button').click(function () {
$('button').off('click');
isCliked && $('button').click(function() {
console.log('dont call alert');
isCliked = false;
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>
Click Me !
</button>

JQuery off() method remove event handler of element. You can remove click event of button when it clicked. Using this work, button click event fired only once.
$("button").click(function(event){
alert();
$(this).off("click");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>Button</button>

You can use jQuery .one() method:
$('button').one('click', function() {
alert('hi');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<button>Click Me !</button>

Javascript not working after postback caused by dropdown

Here is my Javascript which is working initialyy and not working after a postback.
<script type="text/javascript">
$(document).ready(function(){
$('input[type="checkbox"]').click(function(){
if($(this).attr("value")=="cash"){
$(".cash").toggle();
}
if($(this).attr("value")=="cheque"){
$(".cheque").toggle();
}
if($(this).attr("value")=="dd"){
$(".dd").toggle();
}
});
});
</script>

Try like this
$('input[type="checkbox"]').on('click', (function () {
if($(this).attr("value")=="cash"){
$(".cash").toggle();
}
if($(this).attr("value")=="cheque"){
$(".cheque").toggle();
}
if($(this).attr("value")=="dd"){
$(".dd").toggle();
}
});
or you can use change event also

impress.js - Next and Previous buttons

I've looked at the other questions on this topic, and know that I have to do something like this:
I've created buttons:
<button id="next"></button>
<button id="prev"></button>
And then at the bottom of the page, I have this (this was taken from the other question here):
<script src="js/impress.js"></script>
<script>impress().init();</script>
<script>
$("#next").click(function () {
api.next();
});
$("#prev").click(function () {
api.prev();
});
</script>
But it isn't working at all; can someone give me a hand with this?

it works, if next-prev are in inside impress div
$('#next').on('click', function(e){
impress().next();
e.stopPropagation();
});
$('#prev').on('click', function(e){
impress().prev();
e.stopPropagation();
});

Replace your script this way:
<script>
$("#next").click(function () {
impress().next();
});
$("#prev").click(function () {
impress().prev();
});
</script>

Have you included jQuery? If not, add this too:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>

Jquery .click not firing

Trying to learn JQuery here, im starting off really simple.
When I click the button, the page reloads and nothing happens.
Heres my JS:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript" charset="utf-8">
$("#submitShout").click(function() {
alert('hi');
});
</script>
Here's my html:
<div class="panel right">
<form name="shout" >
<textarea name="text" id="text" class="ribbitText"></textarea>
<input type="submit" id="submitShout" value="Ribbit!">
</form>
</div>

i think you forgot document.ready..
$(function () { //<--- here..the codes below is called whn document is ready
$("#submitShout").click(function () {
alert('hi');
});
});

Make sure you include jQuery reference and you code surrounded with
$(function(){
});
as
$(function () {
$("#submitShout").click(function () {
alert('hi');
});
});
or click binded at the end of the document

Just try this,
$("#submitShout").on("click", function() {
alert('hi');
});
If it is lower version Jquery, try this.
$("#submitShout").live("click", function() {
alert('hi');
});

jQuery 1.9 version
$(function(){
$("#submitShout").on('click',function(){
//your code
});
});
jQuery version lower than 1.9
$(function(){
$("#submitShout").live('click',function(){
//your code
});
});

that's a really old jquery version, upgrade it to something newer:
https://developers.google.com/speed/libraries/devguide#jquery

I guess Either you are missing the doc ready handler or the jQuery lib:
first try with this:
$(function(){
$("#submitShout").click(function() {
alert('hi');
});
});
then this one:
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script>
$(function(){
$("#submitShout").click(function() {
alert('hi');
});
});
</script>

make sure jQuery is loaded
use the latest jQuery library
check the error console (using chrome developer tools or firebug for firefox
try changing your jQuery to
code:
$(function(){
$("#submitShout").click(function(e) {
e.preventDefault();
alert('hi');
return false;
});
});

Try this
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
$("#submitShout").click(function(event) {
alert('hi');
event.preventDefault();
});
});
</script>

simple JQuery example is causing me troubles for unknown reason

I'm relatively new to JQuery and would like to try something. I just followed a simple tutorial to start up with on http://docs.jquery.com/Tutorials:Getting_Started_with_jQuery
So I specified my script in the :
<script type="text/javascript">
$(document).ready(function() {
$("a").click(function() {
alert("Hello world!");
});
});
</script>
and included a test link in the :
Link
however, when I refresh thet document my browser keeps saying
TypeError: Property '$' of object [object Window] is not a function
which I can understand for "normal" JavaScript but I believe this kind of function is new in JQuery. Can someone assist mer here, please?
links:http://wittmerperformance.com/site/

Did you embed the jquery library?
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
Further more I think that currently "on" is state-of-the-art as in:
$(document).ready(function() {
$("a").on('click', function() {
alert("Hello world!");
});
});

try this:
jQuery(document).ready(function($) {
$("a").click(function() {
alert("Hello world!");
});
});

The reason for the issue that you are facing could be that you haven't included JQuery library or it may be due to conflict, give it a try using
jQuery(document).ready(function ($) {
$("a").on('click', function() {
alert("Hello world!");
});
});

<script type="text/javascript">
$(document).ready(
function() {
$("a").click(
function(){
alert("Hello world!");
});
});
</script>
this is a working example.simpler. in your example you fotgot to close a function you started. count ( { } ) ; you are missing }) at the end. it shold work fine yours too.
full working example below:
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(document).ready(
function() {
$("a").click(
function(abc){
alert("Hello world!");
abc.preventDefault();
return false;
});
});
</script>
</head>
<body>
<a>some link</a>
</body>
</html>