Develop Reference

select html object without id

Edit: one missing piece of information - I can't use the class selector because there are more divs with the same class. I already thought of that, but I forgot to mention it. I have no idea why my post got downvoted, but it seems awfully silly considering I provided a lot of information, gave it honest effort, and tried to be verbose with code examples. People on this forum are ridiculous sometimes.
I'm trying to set the id of a div that doesn't have one and there's no way I can give it one upon generation of the page. I've tried using jquery (.each, .contains, .find, .filter, etc.) and I can't seem to get it right. I know a ton of people have asked this question, but none of the answers made sense to me.
I have the ability to set the text (html?) of the div, but nothing else. It ends up looking like this:
<div class="dhxform_note" style="width: 300px;">Remaining letters: 500</div>
I want a handle to the div object so I can show the user how many more letters they can type by updating the text.
Using this:
$("div")
returns a list of all divs on the page. I can see the target div in the list, but I can't get jquery to return a single object.
I know it can also be done with something like this:
var divs = document.getElementsByTagName("div");
for(var i = 0; i < divs.length; i++) {
if( /^Remaining letters/.test(divs[i].innerText) )
divs[i].id = "kudosMsgNote"
}
}
but I was hoping to complete this with a cleaner looking solution involving jquery. I also simply want to know how to do it with jquery, aesthetics not withstanding.

Use a class selector.
var theDivViaTheClass = $(".dhxform_note");
Class Selector (“.class”)
Description: Selects all elements with the given class.
version added: 1.0
jQuery( ".class" )
class: A class to search for. An
element can have multiple classes; only one of them must match.
For class selectors, jQuery uses JavaScript's native
getElementsByClassName() function if the browser supports it.

You seem to be targeting the <div> by its text. Try using the :contains selector:
$("div").filter(':contains("Remaining letters")').first().attr("id", "kudosMsgNote");
The .first() is to make sure you don't set the same id for multiple elements, in case multiple elements contain the text "Remaining letters".
Here's the docs for the :contains selector: http://api.jquery.com/contains-selector/
Be careful, the text you're looking for is case sensitive when using :contains!

Is that div the only one with the class dhxform_note? If so, you can use the class selector:
$('.dhxform_note').html();

With jQuery, you can specify any css selector to get at the div:
$(".dhxform_note").attr("id", "kudosMsgNote");
will get you this element as well.
Selecting on inner text can be a bit dicey, so I might recommend that if you have control over the rendering of that HTML element, you instead render it like this:
<div name="remainingLetters" class="dhxform_note" style="width: 300px">Remaining Letters: 500</div>
And get it like this:
$("[name=remainingLetters]").attr("id", "kudosMsgNote");
However, it's possible that you really need to select this based on the inner text. In that case, you'll need to do the following:
$("div").each(function() {
if ( /^Remaining letters/.test($(this).html()) ) {
$(this).attr("id", "kudosMsgNote");
}
});

If you cannot set id for whatever reason, I will assume you cannot set class either. Maybe you also don't have the exclusive list of classes there could be. If all those assumptions really apply, then you can consider down your path, otherwise please use class selector.
With that said:
$("div").filter(function() {
return /^Remaining letters/.test($(this).text())
}).attr('id', 'id of your choice');

For situations where there are multiple divs with the class dhxform_note and where you do not know the exact location of said div:
$("div.dhxform_note").each(function(){
var text = $(this).text();
if(/^Remaining letters/.test(text)){
$(this).attr("id", "kudosMsgNote");
}
});
EXAMPLE
If, however, you know that the div will always be the 2nd occurrence of dhxform_note then you can do the following:
$("div.dhxform_note").get(1).id = "kudosMsgNote";
EXAMPLE
Or do a contains search:
$("div.dhxform_note:contains('Remaining letters')").first().attr("id", "kudosMsgNote");
EXAMPLE

JQUery find and match parent based on a dynamic child class

Ok it's a little hard to explain in a single title but basically I have a dynamic class added to a child element based on it's parent's dynamic class. Added so:
$('ul').each(function(key){
if ($(this).hasClass('sortable')){
$(this).addClass('parent' + key);
$(this).children().addClass('parent' + key);
};
});
The structure is pretty simple after this:
<ul class="parent0">
<li class="parent0">
<ul class="parent1">
<li class="parent1"></li>
</ul>
</li>
</ul>
Now the UI has the user move these li outside of the parent and placed elsewhere. Later on, I want to check the element and then match it to it's corresponding (original) parent. It can't be $(this) parent because it will be moved out of the parent but the classes still remain.
So the check is looking for .parent(n) and then finding the ul with .parent(n) eventually this code will live inside:
$('sortable li').appendTo($('THIS-IS-THE-DYNAMIC-CLASS'));
So I'm assuming the find will be before this but I don't know how to write that.

I would use a different attribute other than class so it can be wholly unique. Either use $(this).data or $(this).attr. And I would recommend assigning IDs to the parent (or a different attribute) that, again, can be wholly unique. This will keep things cleaner in my opinion.
For example...
Assuming:
$(this).attr('parentClass', '.parent' + key);
then
$('.sortable li').each(function() { $(this).appendTo($(this).attr('parentClass')); });

Javascript/jQuery .each and syntax issue

I'm having some trouble writing a function to change a background image on a div on document.ready
I haven't made a jsfiddle as i think the problem is just my poor (but improving) jQuery skills. Please let me know if you think one is needed.
Background Info ->
I have a collection of div's with a class of portlet-visible or portlet-hidden, each of these div's will have another class of red-arrow (or a different color, but once i have one color it should be easy to extrapolate). When the page loads i would like a function that can find all divs with a class of portlet-hidden or portlet-visible and see if those have a class of red-arrow. If they do then change the background image src to a different value.
Im really struggling to work this one out, and any help is much appreciated.
My HTML
<div class="portlet-visible red-arrow"></div>
My CSS
div.portlet-visible
{
position:absolute;
top:12px;
right:10px;
background-image:url(../images/red-arrow-up.png);
width:14px;
height:14px;
}
And finally my javascript
$(document).ready(function() {
$(".portlet-hidden" && ".portlet-visible").each(function() {
if ($("this").hasClass(".red-arrow")) {
$(this).css(background-image, url('"url(../images/blue-arrow-up.png)"')
};
});
});

Multiple selectors should be separated by a comma(,) and also css method takes a string or a map. Try this.
$(document).ready(function() {
$(".portlet-hidden, .portlet-visible").each(function() {
if ($(this).hasClass("red-arrow")) {
$(this).css('background-image', "url('../images/blue-arrow-up.png')")
};
});
});

I would have written the selector this way
$(".portlet-hidden, .portlet-visible")

Unless there's a specific reason you want to do this with jQuery you should just use CSS...
div.portlet-visible
{
background-image:url(../images/red-arrow-up.png);
width:14px;
height:14px;
}
div.portlet-visible.red-arrow
{
background-image:url(../images/blue-arrow-up.png);
}
Any div with the class "portlet-visible" is defined in the first block, and any div with the classes "portlet-visible" and "red-arrow" will use the same css, but also apply the new background image.
http://jsfiddle.net/johncmolyneux/gcm5b/

First... Archer's answer is spot on-- what you're trying to do with jQuery can be done with CSS alone.
But if for some reason you do need jQuery, a few things are wrong here.
First, as justtkt said in his answer, your selector is wrong. There is no need (and is syntactically wrong) to use conditional operators like && or || in a jQuery selector. This is simply because there is already conditional syntax built in to CSS, upon which jQuery selectors are directly based.
.this-class.that-class
Selects all elements with both .this-class, and .that-class.
#this-id.that-class
Is a very (possibly overly) specific declaration that select an element (there should only be one ID per page) with both #this-id and .that-class
For more on selectors, please read this very thorough, complete, and educational link http://www.w3.org/TR/selectors/
Additionally and importantly
This line:
$("this").hasClass(".red-arrow")
Is wrong! hasClass does not require a selector (the ".") because it only takes a class. It should be
$("this").hasClass("red-arrow")
Also!!
$(this).css(background-image, url('"url(../images/blue-arrow-up.png)"')
This line has some errors... should be:
$(this).css("background-image", "url(../images/blue-arrow-up.png)")
although I think the following syntax is easier:
css({'background-image' : 'url(../images/blue-arrow-up.png)'})

Your selector is just incorrect. If you want to match things with both classes, it'd be:
$('.portlet-hidden.portlet-visible').each( ...
If you want to match either of the classes:
$('.portlet-hidden, .portlet-visible').each( ...
The expression ".portlet-hidden" && ".portlet-visible" will always evaluate to just ".portlet-visible".

Instead of && two selectors together, use the multiple selector like $(".portlet-hidden, .portlet-visible") or the .add() method to build up your jQuery.
Your current line is actually anding the two strings together, which I believe will return boolean true in Javascript.

if ('$("this").hasClass(".red-arrow")') { <--- this condition is a string here
Should be:
if ($(this).hasClass(".red-arrow")) {

change in selector ".portlet-hidden,.portlet-visible"
change if condition to boolean from string
change in css.
$(".portlet-hidden,.portlet-visible").each(function(){
if ($("this").hasClass("red-arrow")){
$(this).css("background-image", "url('../images/blue-arrow-up.png')");
}
});

Select all elements that have a specific CSS, using jQuery

How can I select all elements that have a specific CSS property applied, using jQuery? For example:
.Title
{
color:red;
rounded:true;
}
.Caption
{
color:black;
rounded:true;
}
How to select by property named "rounded"?
CSS class name is very flexible.
$(".Title").corner();
$(".Caption").corner();
How to replace this two operation to one operation. Maybe something like this:
$(".*->rounded").corner();
Is there any better way to do this?

This is a two year old thread, but it was still useful to me so it could be useful to others, perhaps. Here's what I ended up doing:
var x = $('.myselector').filter(function () {
return this.style.some_prop == 'whatever'
});
not as succinct as I would like, but I have never needed something like this except now, and it's not very efficient for general use anyway, as I see it.

Thank you, Bijou. I used your solution, but used the jQuery .css instead of pure javascript, like this:
var x = $('*').filter(function() {
return $(this).css('font-family').toLowerCase().indexOf('futura') > -1
})
This example would select all elements where the font-family attribute value contains "Futura".

You cannot (using a CSS selector) select elements based on the CSS properties that have been applied to them.
If you want to do this manually, you could select every element in the document, loop over them, and check the computed value of the property you are interested in (this would probably only work with real CSS properties though, not made up ones such as rounded). It would also would be slow.
Update in response to edits — group selectors:
$(".Title, .Caption").corner();

Similar as Bijou's. Just a little bit enhancement:
$('[class]').filter(function() {
return $(this).css('your css property') == 'the expected value';
}
).corner();
I think using $('[class]') is better:
no need to hard code the selector(s)
won't check all HTML elements one by one.
Here is an example.

Here is a clean, easy to understand solution:
// find elements with jQuery with a specific CSS, then execute an action
$('.dom-class').each(function(index, el) {
if ($(this).css('property') == 'value') {
$(this).doThingsHere();
}
});
This solution is different because it does not use corner, filter or return. It is intentionally made for a wider audience of users.
Things to replace:
Replace ".dom-class" with your selector.
Replace CSS property and value with what you are looking for.
Replace "doThingsHere()" with what you want to execute on that
found element.
Good luck!

Custom CSS properties aren't inherited, so must be applied directly to each element (even if you use js to dynamically add properties, you should do it by adding a class), so...
CSS
.Title
{
color:red;
}
.Caption
{
color:black;
}
HTML
You don't need to define a rounded:true property at all. Just use the presence of the 'Rounded' class:
<div class='Title Rounded'><h1>Title</h1></div>
<div class='Caption Rounded'>Caption</div>
JS
jQuery( '.Rounded' ).corner();

jQuery Remove Div Based On Content

i would like to remove/hide a li based on the content inside it, is this easy to do?
eg. the code below: if span#type has no content then li.grouping should be removed or hidden.
<li class="grouping"><span class="desc">Options:</span><br /><span id="type"></span></li>

$("li.grouping:has(span#type:empty)").remove()
It would seem to make more sense if type were a class, rather than an id, as there should only be one element with a given id on the page. In that case:
$("li.grouping:has(span.type:empty)").remove()

maybe something like
if ($("span#type").text() == "") {
$("li.grouping").hide();
}