Develop Reference

Preventing href in <a></a> from executing via Javascript

So I have this following code in my HTML:
<li class="" id="toolbar_section"><a id="toolbar_section_child" href="#foobar" onclick="return toolbarSetSection(this);" data-toggle="checkpoint">foobar</a></li>
And written in my Javascript is:
<script type="text/javascript">
function toolbarSetSection(event){
//some logic which leads to
return false;
};
</script>
However, the href still executes... I have checked many similar topics with answers like event.preventDefault(); but they don't help me either.

In your HTML you should change onclick="return toolbarSetSection(this);" to onclick="toolbarSetSection(event);", and then have event.preventDefault(); in your javascript function.
Your full code would be:
<li class="" id="toolbar_section"><a id="toolbar_section_child" href="#foobar" onclick="toolbarSetSection(event);" data-toggle="checkpoint">foobar</a></li>
and
function toolbarSetSection(event) {
event.preventDefault();
return false;
};

return false should usually work, but maybe there is an error in your toolbarSetSection function.
Calling event.preventDefault() should usually work, too. However in your case you expect the function to be called with event as first parameter, while your HTML code calls onclick="return toolbarSetSection(this);" with the link object as first parameter. Maybe you wanted to call toolbarSetSection(event); instead.

HTML
<ul>
<li class="" id="toolbar_section2"><a id="toolbar_section_child" href="#" onclick="toolbarSetSection()" data-toggle="checkpoint">foobar</a></li>
</ul>
js
function toolbarSetSection()
{
alert('started');
event.preventDefault();
alert('weee');
}
jsfiddle so you cannot say it is not working :) : https://jsfiddle.net/rgoopw18/1/

a better way to get the expected behavior without adding onclick on the tag
<script>
document.getElementById('toolbar_section_child').on('click', function(e){
e.preventDefault();
})
</script>
Assuming you have a unique id for the a tag.
EDIT
for dynamically created elements use event delegation
document.addEventListener('click',function(e){
/*
if(e.target && e.target.id == 'toolbar_section_child'){
e.preventDefault();
}
*/
// using a common class name
if(e.target && e.target.className.split(" ").indexOf("toolbar_section_child") != -1){
e.preventDefault();
}
})

Disable load function untill button is selected in javascript?

Hi this is an odd question and i will try to ask it correctly. I have a function using javascript called load canvas.
function loadCanvas(canvas) {
relevant code here...
}
I also have a normal button called btn.
<button class="btn" type="button">Play!</button>
I am wondering can i disable the function until the play button is selected? The function is for a game using javascript. So on load there isnt anything there until i press play then it appears!
any ideas/help please?

$(document).ready(function(){
var loadCanvas= function (canvas) {
relevant code here...
}
$("#test").on('click',loadCanvas()); // using jquery
document.getElementById("test").addEventListener("click",loadCanvas()); // using javascript
<button class="btn" id="test" type="button">Play!</button>
})

If you are having issue because other method is triggering the function you can add a flag with a boolean and turn it on when you click..
Something like that:
The button don't change at all
<button class="btn" type="button">Play!</button>
The js code with this change:
var buttonClicked = false;
function loadCanvas(canvas) {
if(buttonClicked){
relevant code here...
}
}
And in the on click function add this before call the function:
buttonClicked = true;
At the end your js should look like this:
var buttonClicked = false;
function loadCanvas(canvas) {
if(buttonClicked){
relevant code here...
}
}
$(".btn").click(function(){
buttonClicked = true;
var canvas = ...;
loadCanvas(canvas );
});
EDIT
If you have more buttons with the class .btn you should use an id and change the selector of the .click() with the selector of the id instead of the class selector

As you mentioned in the comments <script type="text/javascript"> loadCanvas("game"); </script> You are calling the function as soon as the page loads. So you will have to change it to:
<button class="btn play-button" type="button">Play!</button>
<script type="text/javascript">
$('.play-button').click(function(e){
loadCanvas("game");}
);
</script>
If you are not using jquery you will have to handle the click event by javascript.

You got to do following:
function loadCanvas(game) {
alert('loading canvas');
}
<button class="btn" type="button" onclick="loadCanvas('game')">Play!</button>

Add in onclick the script type

I need to call the method _trackingEvent if the button was clicked, So I added in the onlick in the button the following code :
<button class="btnInscription"
onclick="<script type="text/javascript">
$(function () {GA._trackEvent('Account','Subscribe','Not Facebook');});
</script>;">
when I look in the source of page all code that I put it up is whith red color. I think the problem is with parenthesis.

I see 2 problems :
you have unescaped " inside your attribute
you don't need the tag inside onclick ( onclick code is always javascript code)
the following code should work :
onclick="$(function () {GA._trackEvent('Account','Subscribe','Not Facebook');});"

don't do thinks like this!
Better this way:
<button class="btnInscription">blub</button>
<script>
$('.btnInscription').on('click', function() {
GA._trackEvent('Account','Subscribe','Not Facebook');
});
</script>
make sure to launch JS at the Bottom of your page

You are miss placing it.
The script tag should be in the head of the page and the onclick attribute should call the function :
//this should be in the <head> of the page, inside a <script> tag
function track() {
//$(function () {GA._trackEvent('Account','Subscribe','Not Facebook');});
console.log('executed when clicked');
}
<button class="btnInscription"
onclick="track()">test</button>

Also Try Once In Javascript
function testfun() {
//$(function () {GA._trackEvent('Account','Subscribe','Not Facebook');});
console.log('If Click == true then it will execute');
}
<button class="btnInscription"
onclick="testfun()">click</button>

try it Once In your File
<button class="btnInscription" id="my-btn">click</button>
<script>
$(dicument).ready(function(){
$('#my-btn').click(function(){
alert('clicked for testing');
{GA._trackEvent('Account','Subscribe','Not Facebook');}
});
});
</script>

jQuery toggle search button

I use old javascript code to flip my search button from search to searching in my forms as follows
<div id="search_clickable"> <input class="search" type="submit" value="search" onClick="javascript:flipSearchButton();"></div>
<div id="search_unclickable" class="hidden"><img src="/assets/img/searching.png" alt=""></div>
My javascript function is
function flipSearchButton()
{
document.getElementById('search_clickable').style.display = 'none';
document.getElementById('search_unclickable').style.display = 'block';
}
How to I achieve this with jQuery?

function flipSearchButton(){
$('#search_clickable').hide(); // or - $('#search_clickable').toggle();
$('#search_unclickable').show(); // or - $('#search_unclickable').toggle();
}
And stop using inline javascript:
$('.search').click(flipSearchButton);
Note that your search button is of type submit (?!) so it will submit the form, You probably want to change the type to button or return false from the callback:
function flipSearchButton(){
$('#search_clickable').hide();
$('#search_unclickable').show();
return false;
}

include jquery:
<script type="text/javascript" src="jquery.js"></script>
then:
function flipSearchButton()
{
$('#search_clickable').hide();
$('#search_unclickable').show();
}

i thought something like this:
$("#search_clickable").click(function() {
$("#search_clickable").hide();
$("#search_unclickable").show();
});
if you wanna toggle this element, use toggle() instead of hide() and show().

You can also consider to use fade effect to improve user experience
function flipSearchButton()
{
$('#search_unclickable').fadeIn('slow', function() {
// Animation complete
});
$('#search_clickable').fadeOut('slow', function() {
// Animation complete
});
};

You don't even need a separate function:
$("input[type=submit").click(function() {
$("#search_clickable").hide();
$("#search_unclickable").show();
});
Or use the id/class of the submit button if you want to on a specific button:
$(".search").click(function() {
$("#search_clickable").hide();
$("#search_unclickable").show();
});

Please refer below URL for toggle Div.
Check below Working Demos
As per your question : Demo1
As per my opinion : Demo2
Thanks

How do I bind to the click event from within the click event when I need to do it repeatedly?

I've got code so that when you click on a word, it is replaced by another word.
<script>
$(document).ready(function() {
$('.note_text').click(function(){
$(this).remove();
$('#note_div').append('<span class="note_text">new</span>');
// re-applying behaviour code here
});
});
</script>
<div id="note_div">
<span class="note_text">preparing</span>
</div>
I need the appended word to have the same click behaviour. What is the best way to do this?

change
$('.note_text').click(function(){
to
$('.note_text').live('click',function(){
This will cause anything on your page that ever gets the class 'note_text' to have the behaviour set by .live

You should use a .live()help or .delegate()help binding for that purpose.
$(function() {
$('#note_div').delegate('.note_text', 'click', function(e) {
$(e.target).parent().append("<span class='note_text'>new</span>").end().remove();
});
});
Demo: http://www.jsfiddle.net/PkngP/2/

You could rebind the handler:
function handler(){
$(this).remove();
$('#note_div').append("<span class="note_text">new</span>");
$(".note_text").unbind("click");
$('.note_text').click(handler);
}
$(document).ready(function() {
$('.note_text').click(handler);
});