Develop Reference

How to change the order of events?

Is it possible to change the order of events to invoke alert function with message Huh? first and only then next alert with 'Yeah!' message?
<div class="elem" onclick="alert('Yeah!')"></div>
My jQuery code.
$('.elem').click(function () {
alert('Huh?');
})
Link to jsFiddle: http://jsfiddle.net/84Lyq3n9/

How about this:
var inline_click_handler_src = $('.elem').attr('onclick');
var inline_click_handler = new Function('e', inline_click_handler_src);
$('.elem').removeAttr('onclick');
$('.elem').click(function () {
alert('Huh?');
inline_click_handler();
});
[Edit] Or without mucking with markup content:
var el = $('.elem').get(0);
var inline_click_handler = el.onclick;
el.onclick = null;
$('.elem').click(function () {
alert('Huh?');
inline_click_handler();
});
[One more edit] In case your inline click handler uses this, use function.call(), to set the execution context:
var el = $('.elem').get(0);
var inline_click_handler = el.onclick;
el.onclick = null;
$('.elem').click(function () {
alert('Huh?');
inline_click_handler.call(el);
});

But you can do it with many ways.
First you can remove the attribute "onclick".You can do it with javascript.
$('.elem').removeAttr("onclick");
$('.elem').click(function () {
alert('Whatever you want');
alert('Huh?');
})
Here is a link: http://www.w3docs.com/learn-javascript/javascript-events.html

onclick() automatic firing on loading but failing afterwards

I understand that onclick() in html with parenthesis calls automatically. But in my situation, I want to pass a parameter into the onclick function(specifically, the element clicked). So how do I manage this without having onclick fired when the page loads? In addition, the onclick method does not fire after its automatically firing upon loading. My code is below:
for (i = 0; i < returnPostPhotoSrcs().length; i++) {
// var photosArray=returnPhotoNames()
// var imgName=photosArray[i]
var imgSrcArray=returnPostPhotoSrcs();
var imgSrc=imgSrcArray[i]
var postNamesArray=returnPostNamesArray();
var postName=returnPostNamesArray[i]
var img=img_create(imgSrc,postName,'')
img.style.width=returnPostHeight();
img.style.height=returnPostWidth();
img.className="postImage";
img.onmousedown=playShout(img);
var postNamesArray=returnPostNames();
var innerSpan = document.createElement('span');
innerSpan.onmousedown=playShout(innerSpan); //problem line
var text = postNamesArray[i];
innerSpan.innerHTML = text; // clear existing, dont actually know what this does
var outerSpan = document.createElement('span');
outerSpan.className="text-content";
outerSpan.onmousedown=playShout(outerSpan); //another problem line, also doesnt call onclick
var li = document.createElement('li');
var imgSpacer=img_create('spacerSource',"spacer",'')
imgSpacer.style.width="25px";
imgSpacer.style.height=returnPostWidth();
li.appendChild(img)
outerSpan.appendChild(innerSpan)
li.appendChild(imgSpacer)
imgSpacer.style.opacity="0"
// if (i>0 && i<returnPostPhotoSrcs().length-1) {
// hackey
var imgSpacer=img_create('spacerSource',"spacer",'')
imgSpacer.style.width="25px";
imgSpacer.style.height=returnPostWidth();
li.appendChild(imgSpacer)
li.appendChild(outerSpan)
imgSpacer.style.opacity="0"
// }
var outerDiv = document.getElementById("postDivOuter");
outerDiv.appendChild(li)
}

Adding onto this you could also do:
img.onmousedown= function(e) { playShout(e) };
//for playshout
playshout = function(e) {
var element = e.target; //this contains the element that was clicked
};

The function fires because you are calling it. You need to use a closure
img.onmousedown= function() { playShout(img) };

As others have shown, you can create an anonymous function, or another option is to use .bind():
innerSpan.onmousedown = playShout.bind(null, innerSpan);

Copy/Paste element with jQuery

I have a div that I'm appending to another div when a button is clicked. I'm also calling a bunch of functions on the div that gets created.
HTML
<a onClick="drawRect();">Rect</a>
JS
function drawRect(){
var elemRect = document.createElement('div');
elemRect.className = 'elem elemRect';
elemRect.style.position = "absolute";
elemRect.style.background = "#ecf0f1";
elemRect.style.width = "100%";
elemRect.style.height = "100%";
elemRect.style.opacity = "100";
renderUIObject(elemRect);
$('.elemContainer').draggableParent();
$('.elemContainer').resizableParent();
makeDeselectable();
handleDblClick();
}
var createDefaultElement = function() {
..
..
};
var handleDblClick = function() {
..
..
};
var renderUIObject = function(object) {
..
..
};
var makeDeselectable = function() {
..
..
};
I could clone the element when the browser detects a keydown event
$(window).keydown(function(e) {
if (e.keyCode == 77) {
$('.ui-selected').clone();
return false;
}
});
then append it to #canvas. But the problem is, none of the functions I mentioned above get called with this method.
How can I copy/paste an element (by pressing CMD+C then CMD+V) and call those above functions on the cloned element?

The jQuery.clone method returns the cloned node. So you could adjust your code to do something like this:
var myNodes = $('.ui-selected').clone();
myNodes.each(function () {
createDefaultElement(this);
appendResizeHandles(this);
appendOutline(this);
});

Onclick event not working when creating elements

I was adding elements with this code and the onclick event was working fine:
$("#main").before('<ul class=\"breadcrumb\"><li><span>Home</span></li></ul>');
But I'm not using jQuery anymore, and with the code below, the onclick events are not firing.
Any idea why this is happening?
var breadcrumb = document.createElement('ul');
breadcrumb.className = 'breadcrumb';
var element = document.createElement('li');
var elementlink = document.createElement('a');
elementlink.onclick = function () {
Search("/");
return false;
};
var elementspan = document.createElement('span');
elementspan.innerHTML = 'Home';
elementlink.appendChild(elementspan);
element.appendChild(elementlink);
breadcrumb.appendChild(element);
document.getElementById('main').insertBefore(breadcrumb, null);

Add a listener instead of setting the onclick property of the element.
Apparently it should work though: http://jsfiddle.net/6gb2k/
Try:
elementlink.addEventListener('onclick', function(e) { ... }, false);
or cleaner:
var handleClick = function(e) {
...
}
elementlink.addEventListener('onclick', handleClick, false);
Your above code should work however according to #crush's comment and my fiddle.

Javascript doing something strange? works in IE but not firefox?

I'm trying to create an element onclick and hide the element when it is clicked but it does nothing?
Why does the hide() function do nothing?
<script type="text/javascript">
function show(){
var a = document.getElementById('foo');
var b = document.createElement("div");
b.setAttribute('id', 'bar');
b.setAttribute('onclick', 'hide()');
a.appendChild(b);
b.innerHTML = 'TEXT CONTENT';
b.onclick = function() {
hide();
};
}
function hide() {
var x = document.getElementById('foo');
var z = document.getElementById('bar');
x.removeChild(z);
}
</script>
<div id="foo" onclick="show()">CLICK ME</div>

Add
b.onclick = function() {hide();};

If this is occurring under IE, then see Stackoverflow - Why does an onclick property set with setAttribute fail to work in IE?

you can use jquery method to register function it will work in both IE,FF
A sample for u
$(b).click(function() {
//call your function like hide() i have made a separate function for cleaner code and re usability
});
function hide()
{
}