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Change page using a button in SP2010, strange behaviour

I'm trying to do something in Sharepoint 2010 that ought to be very simple, create a button that changes page (to a "create new item" form as it happens).
I set up a Content Editor Webpart and put a button in it (not in a form, because in Sharepoint the whole page is a form) with an "onclick" handler that changed the windows.location.href.
In 2010 the CEWP fights you a bit when you try to enter non-trivial HTML, it keeps escaping characters like "&" which can be a real pain. However in the end I got the right content entered.
It didn't work (the page just refreshed itself without changing URL). By checking on StackOverflow I found some recommendations for a more robust form for the CEWP content, which ended up as-
<script type="text/javascript">
function submit_rec(){
window.location.href = "<my server root URL>/Lists/Rec/NewForm.aspx";
return;
}
</script>
<button onclick="javascript:return submit_rec();return false"/>Submit a Recommendation</button>
Here's the strange part.
If I use Firebug and put a breakpoint in the submit_rec() function this works fine. But without a breakpoint, it goes back to the behaviour of always returning to the current page.
It seems there's a timing issue, or Sharepoint is taking control after my URL starts to load, and reloads the original page again!
Anyone seen this before and found a solution?
Ideas and suggestions woudl be much appreciated.
Regards: colin_e

Try this:
javascript:SP.UI.ModalDialog.OpenPopUpPage('/dev/KfD/KfDdev/Lists/Recommendation/New‌​Form.aspx');return false;
in the onclick event

Thanks to everyone who responded. With some more experimentation, and following hints from other threads on Stackoverflow, I was finally able to get this working.
My mistake with my last effort, using the Sharepoint builtin OpenNewFormUrl() function, was to expect this this would be a global function defined in a central library by SP. Turns out it's not, it has to be defined separately on every page where it's used, partly because it hard-codes the size of the popup frame for the library edit form.
(Yes this is ugly, like a lot of Sharepoint under the covers, anyway, I digress...)
I was able to get a Sharepoint 2010 style "popup" editor working with a button of the same style as the standard SP Document Centre "Submit a Document" button using the following code in a Content Editor WebPart. I have no idea what the script does in detail, I just copied it from the Document Centre site template home page-
<script type="text/javascript">
// <![CDATA[
function ULS18u(){var o=new Object;o.ULSTeamName="DLC Server";o.ULSFileName="default.aspx";return o;}
var navBarHelpOverrideKey = "wssmain";
// ]]>
function OpenNewFormUrl(url)
{ULS18u:;
var options = {width:640, height:720};
SP.UI.ModalDialog.commonModalDialogOpen(url, options, null, null);
}
</script>
<div class="ms-uploadbtnlink">
<button onclick="javascript:OpenNewFormUrl('/dev/KfD/KfDdev/Lists/Recommendation/NewForm.aspx');return false;" type="submit"><nobr><img alt="Submit a Recommendation" src="/_layouts/Images/uploaddoc.png"/> <span>Submit a Recommendation</span></nobr>
</button>
</div>
I'm wary of what setup this will do if (say) the users screen is smaller than the hard-coded popup size, and i'm still confused as to why my earlier (and much simpler) efforts failed, but at least I have a working soluion.

Jquery Modal window - Modal property breaks code

I hope someone can help. I am missing some logic and styles while I am running the form in JQuery modal window with the 'modal' property is set to 'true'. I am trying to utilize the form from http://jqueryui.com/dialog/#modal-form.
The same code used outside modal window is running correctly. I am not sure how to fix it and decided to share it with you.
I created a page in JSFiddle - http://jsfiddle.net/vladc77/GcQRg/16 to show the code. However, the modal window cannot be ran from there. As a result, I uploaded the same test in here - http://www.vladcdesign.com/modalWindow
When I set (modal: true) then I am getting the following problems.
1.The check boxes in work hours form should enable/disable menus to set the time
2.“More” check box should show/hide a text field
3.I lost ability to set margins between elements in Hours settings form. Now all menus are touching each other even though I use margins styles. They just don’t apply.
All of these issues are present only while I run this DIV in a modal window. It works OK outside the modal window. I am wondering if someone can help and explain what is wrong with the code. Any advice is highly appreciated.

Looking at both the fiddle and the example you posted on your site, you're getting the following error:
Uncaught ReferenceError: closedHours is not defined
The problem appears to be coming from this line:
$(this).append(' <span class="closed custom-checkbox"><input type="checkbox" name="closed" value="closed" class="closed" id="closedHoursElement" onchange="closedHours()"><span class="box"><span class="tick"></span></span></span>Closed');
Also, the reason you can't get the dialog to load on your fiddle is that you're including the JS files in the wrong order. It should be jquery, jquery ui, and then jquery ui.selectmenu.
Your change function on the checkboxes also has a bug, it should be something like this:
$('input[type=checkbox]').change(function() {
if (!this.checked) {
$(this).parent().siblings('select').removeAttr("disabled");
}
else {
$(this).parent().siblings('select').attr('disabled', 'disabled');
}
});
Even when I changed all that, the checkboxes still weren't working, so I removed your custom jquery and jquery ui references. When I did that, they worked fine so something that you've done to customize those is what's causing your problem. You can view my changes here.

The first $(document).ready(function(){}); and second $(function() { }); are the same, the code will be executed in order they are in these blocks.
However the $(window).load(function(){ }); is a little bit differenet, it gets executed later. Check this post to see the difference.
You could experminet a little with defining the click event to your "Open modal window" button, and do all of the binding when that fires:
$('#create-user').bind('click',function(e){
// To avoid navigating by link
e.preventDefault();
e.stopPropagation();
// Do every binding / appending
// $('.workDayHours').each(function() { ...
});

How do I discover which function is called when I press a button?

I'm stuck modifying someone else's source code, and unfortunately it's very strongly NOT documented.
I'm trying to figure out which function is called when I press a button as part of an effort to trace the current bug to it's source, and I"m having no luck. From what I can tell, the function is dynamically added to the button after it's generated. As a result, there's no onlick="" for me to examine, and I can't find anything else in my debug panel that helps.
While I prefer Chrome, I'm more than willing to boot up in a different browser if I have to.

In Chrome, type the following in your URL bar after the page has been fully loaded (don't forget to change the button class):
var b = document.getElementsByClassName("ButtonClass"); alert(b[0].onclick);
or you can try (make the appropriate changes for the correct button id):
var b = document.getElementById("ButtonID"); alert(b.onclick);
This should alert the function name/code snippet in a message box.
After having the function name or the code snippet you just gotta perform a seach through the .js files for the snippet/function name.
Hope it helps!

Open page with your browser's JavaScript debugger open
Click "Break all" or equivalent
Click button you wish to investigate (may require some finesse if mouseovering page elements causes events to be fired. If timeouts or intervals occur in the page, they may get in the way, too.)

Inspect the buttons markup and look at its class / id. Use that class or id and search the JavaScript, it's quite likely that the previous developer has done something like
document.getElementById('someId').onclick = someFunction...;
or
document.getElementById('someId').addEventListener("click", doSomething, false);

You can add a trace variable to each function. Use console.log() to view the trace results.
Like so:
function blah(trace) {
console.log('blah called from: '+trace);
}
(to view the results, you have to open the developer console)

Server side JavaScript action

I coded a chat script using AJAX.NET. For every button click I am using the following sample of code in which I am using OnClientClick function to scroll down on every button click i.e. update.
<asp:Button ID="btn_msg" runat="server" Text="Submit" OnClick="btn_msg_Click" OnClientClick="scrolldown('div1')" />
This results fine on the page I am working but in the receiver side scroll bar is not getting down on update. I guess changing the option OnClientClick to some server action will help. I tried adding OnClick="btn_msg_Click; scrolldown('div1');" but this is not working. Is there any alternate way to fulfill my action.

At first glance, I believe Anton is correct. The reason you are seeing this behavior is the order in which everythings runs. The client script runs first. Then the server script. The server script causes a postback( or even via an update panel ), causing it to render the html again, losing the scroll bar position.
Anton's code causes the scrolldown function to run once the ajax postback is complete.
A side note:
If I were doing this, I'd remove the AJAX.NET completely and switch to jquery. You have a lot more control over this kind of stuff.

You need to hook on the endCallback event to scrolldown.
The moment you try to scroll down content is not yet delivered.
Try it this way:
<body onload=”load()”>
<script>
function EndRequestHandler()
{
scrolldown('div1');
}
function load()
{
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
}
</script>

Anyone can close the popup generated by Jquery plugin bPopup, from a child iframe?

Okay, the story is abit long but hope you can bear with me so that there could be some background to the problem:
I'm developing the registration section for a portal using ASP.NET and to make things nice,
I decided to use bPopup from here to load the registration page into the iframe of the calling page (parent page). Now I need a way to close down the iframe after a successful registration so from the codebehind of the registration page (nested in the iframe) I tried a Javascript function from the parent that allows me to do so, here's the function to close the iframe generated by the plugin:
function bPopup_close() {
$(".bClose").closePopup();
return false;
}
and here's the code behind from the iframe (the function will be called on submit):
ClientScript.RegisterOnSubmitStatement
(GetType(), "Javascript", "javascript: window.opener.bPopup_close();");
I wasn't able to close the popup. Interestingly, Firebug showed me that after I clicked the submit button, window.opener was null. Does that mean that the parent was indeed closed? Anyway the popup was still there...
Hope you guys could share some insights on anything similar?

I can see that dinbror already answered you on his page :)
#fred: Glad you like it. Are you using
the newest version of bPopup?
Solution: Create a function on the
page which opens the popup:
function closeBPopup() {
$(selector).bPopup().close() }
Then you can trigger it inside your
iframe whenever you are done doing
your stuff with:
parent.closeBPopup();

After half a day, I finally got it working with:
ClientScript.RegisterStartupScript
(GetType(), "blah", "< script type=\"text/javascript\">bclose(); < /script> ", false);
and the code bclose() is:
function bclose() {
parent.$("#popup").bPopup().close();
return false;
}