Develop Reference

Taking a div element with JQuery and a regular expression

We are working in a Rails application with Prototype and jQuery (we want to remove Protoype at all, but is a migration and we have to do it progressively), and we have a form that can add many fields with jQuery. This fields have a very weird ID:viaje_contratos_attributes_0_cargas_attributes_1385986834726_punto_attributes_municipio
In this field, we need to work with autocomplete jquery, and our problem is take this ID. We've tried the following code:
$('input[id$="_punto_attributes_municipio"]').autocomplete({
source: $('input[id$="_punto_attributes_municipio"]').data('autocomplete-source')
});
What's the problem? What we have to modify?
Thanks in advance!!
Updated [12/02/2013 - 15:35]:
Thanks Jacob Bundgaard for your replies, but still not working :(. But you have made me to think and maybe, because this form is created after load the view with append function, your answer maybe not work for that? Could be?
Anyway, I hardcoded the ui class ui-autocomplete-input and autocomplete="off" but still not working :S.
A temporal solution, obviously, have been coding inline, after the div appended, the jQuery script

What about using a class instead of using id's for something for which they were not intended? That'll make your jQuery significantly simpler, and will probably only take a minor change in your Rails-code.

jQuery remove div by ID on load

I'm trying to remove an entire div on page load. Currently I'm trying to use:
$(document).ready(function(){
$("#removeme").remove();
});
with the HTML
<div id="removeme">If JS enabled remove this!</div>
I've been searching for hours, using many variations including getElementById. No luck.
Javascript/jQuery aren't languages I use often.
All help is appreciated. Thanks!
Edit: Fixed, page I was adding it to was having some issues (another dev built it). I put the code into an existing JS file instead and it works. Thank you all.

$('#remove').html('');
or
$('#remove').empty();
That will remove that text if JS is enabled.

The code you are showing in your question works, as proven by #barmar :
"http://jsfiddle.net/barmar/epsZe/"
If it doesn't work for you, it is most likely because you have an error in your Javascript before you reach the code displayed here. Also, ensure that you have included Jquery before-hand.
To find where previous errors could have happened, you can look inside your Javascript console. Here is a question where it is described where to find your console on most browsers :
What is console.log and how do I use it?
If you don't want to use the console, you can put alerts in your Javascript code until you find where they stop displaying.

try this
$("#removeme").replaceWith("");

A convenient way to see data added to an element via jQuery .data()

I am adding an id to an element via call to jQuery.data:
$layout.nextAll('.imagepicker').data('imgPickerId', randomnumber);
So my element of a class imagepicker will have [imgPickerId=randomnumbervalue] data attribute added to it.
It seems like there is a problem how I later on look for .imagepicker with exactly this imgPickerId. Where can I lookup which attributes are added to a particular element in a convenient way (excep from js code)? Maybe in firebug somewhere?
P.S. for some reason my "getter code" works in jQuery 1.6 but does not in 1.7. Still I am suspecting data isn't being added to an element and need a way to check it.

jQuery's data function stores everything in JavaScript, without altering the DOM in any way. I'm afraid you'll have to use code to access it.
A quick Google search also showed me a FireQuery plugin for Firebug, which seems to enable you to see the attached data of your elements. Haven't tried it myself, though, so I can't confirm that.
Update: Tested it, and it works fine! With FireQuery all data of your elements are visible right next to the HTML:

Have you considered in writing your data in an custom attribute like data-imgPickerID="someID"?
For sure this does not allow you to save huge data but you could inspect it via firebug and since you are only saving an ID it would fit for your needs.
Which is also very cool about the .data() method is you can retrieve your custom attribute from above like so .data("imgPickerID");

data() will save data in memory (of course linked to the elements in your selector), it doesn't write things on the element, so you can't look at that in firebug.
You can pre-populate elements with some data by using the html5 data attibute though
Look at this question for an expanded explanation
How does jQuery store data with .data()?

jQuery FancyBox/Lightbox problem

i write some html with JS into a div.
like this
$("#picdiv").html("<a rel='lightbox' href='pic.jpg'><img src='htumb.jpg'></a>");
it is just an example.
So, i have in $(document).ready Funcktion this code.
$('a[rel=lightbox]').fancybox();
but if i click on the link, a get to the page with picture... i know the Problem must be, i write the html with js, but i have no other option. So haw can I make fancybox works?

This is due to how jQuery works. The fancybox function will only work for current elements on the page and not ones dynamically added by javascript.
A quick fix might be to be modify the code as follows:
$("#picdiv").append($("<a rel='lightbox' href='pic.jpg'><img src='htumb.jpg'></a>").fancybox());
Not sure if the above will work, but the general idea is to ensure that any new elements created have the plugin applied.

solution
$('.picture_display').find('a[rel=lightbox]').fancybox();

Can you insert a form onto a page using jQuery's $.load() function?

I have a page where there's a drag and drop table where the order of the rows determines the value of a subtotal. However, it's more complicated than just addition and I would rather not duplicate the logic in JavaScript to update the values.
A simple solution would be to reload the whole page using Ajax and then replace the table from the page fetched via Ajax. Perhaps it's not the most elegant solution but I thought it'd be a quick way to get the job done that would be acceptable for now.
You can do that with jQuery like this:
$('#element-around-table').load(document.location.href + ' #table-id');
However, my "simple" solution turned out to not be so simple because the table also contains a <form> tag which is not being displayed in Firefox (Safari works).
When I inspect the page using Firebug, I see the form, but it and its elements grayed out.
Searching on the web, I found a rather confused post by a guy who says FF3 and IE strip <form> tags from innerHTML calls.
I'm probably going to move on to do this some other way, but for my future reference, I'd like to know: is this the case?

That post is rather confused, I just tested your code and it worked fine. The form tag was shown in firefox 3.0.8 just fine.
Looking at you code example, though I wonder if you just gave an incomplete example... make sure that the page you call returns only the html that goes inside that wrapper element.

I've run into this type of thing before. FORM tags need to be added to the DOM. If they're added using a method that writes to innerHTML, the tag will appear, but it won't be there as far as JavaScript is concerned.