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Jquery script not working to alter CSS on change

I've added some custom elements to be included with my WooCommerce account page to be seen with the order history. Unfortunately the page is setup with tabs to only display the information pertaining to the active tab.
I'm not very familiar with jquery, but I thought it would be simple enough to use Jquery to hide the divs I added when the order history has a display of none.
I added the following script to my theme's main.js file:
$(document).ready(function(){
var display = $('.my_account_orders');
if(display.css("display") == "none") {
$('.paging-nav').css("display","none");
}
});
When the class .my_account_orders has a display of none it should change the div I added (.paging-nav) to have a display of none. But it just doesn't work.
Is there something wrong with this script or do I need to do something special to initiate it? Since it's in my theme's main.js file and I used $(document).ready(function() I figured it would just load with the page.
Any help with this would be greatly appreciated.

Instead of using:
var display = $('.my_account_orders');
Implement it into the if statement like this:
if($('.my_account_orders').css("display") == "none") {
Because originally it is trying to find a variable called $display, so it would return a syntax error of undefined.

You've got an errant $ in your if statement. This should work instead:
$(document).ready(function(){
var display = $('.my_account_orders');
if(display.css("display") == "none") {
$('.paging-nav').css("display","none");
}
});
Also keep in mind that your var display is only going to match the first element that has a class of my_account_orders, so if there are multiple elements with that class, and they don't all have the same display, you could get unexpected results.

Try this:
$(document).ready(function(){
var display = $('.my_account_orders');
if(display.css("display") == "none") {
$('.paging-nav').css("display","none");
}
});

I believe it's a very lame way to check for a css property such as display to determine if an element is hidden or not. With jquery, you can make use of :hidden selector which determines whether an element is hidden and return a bool value.
$(document).ready(function(){
if($('.my_account_orders').eq(0).is(":hidden")) // eq(0) is optional - it basically targets the 1st occurring element with class 'my_account_orders'
{
$('.paging-nav').css("display","none");
}
});
Example : https://jsfiddle.net/DinoMyte/sgcrupm8/2/

Make TextArea Disabled in JS

I want to make Textarea Disable (Grayed out) in my JS Method
function myfun(status){
if(status=='Yes'){
$('input[id$="txtareaID"]').attr('disabled','disabled');
}
The above code is not working for this.

You should use prop instead of attr:
$('input[id$="txtareaID"]').prop('disabled', true);
jQuery docs

If your selector is correct, than you need only to change attr to prop:
function myfun(status){
if(status === 'Yes'){ // more suitable for comparing
$('input[id$="txtareaID"]').prop('disabled',true);
}
}
Related post:
Disable/enable an input with jQuery?

Considering textarea as
<textarea id='txt'>Something</textarea>
Using jQuery, you can achieve like this
$("#txt").attr('disabled', true);
Using plain javascript
document.getElementById("txt").disabled=true;

Your problem is with CSS not JS. As far I can tell your code is working, but there's no way of changing this specific style. You could try workarounds: Change Font Color For Disabled Input

<textarea> is what you should be looking for not the <input> tag with id = textareaid.
$('input[id$="txtareaID"]').attr('disabled','disabled');
change the above code to the below one and see the magic by clicking the link at the bottom.
$('textarea[id$="txtareaID"]').attr('disabled','disabled');
http://jsfiddle.net/5s9ge7d6/1/

none of the below answers worked.
Then I found something amazing trick which solved my problem ---
Here it is --- JUST REMOVE "input" word from that line in if block -
WORKED CODE :
function myfun(status){
if(status=='Yes'){
$('[id$="txtareaID"]').attr('disabled','disabled');
}
Previous CODE :
function myfun(status){
if(status=='Yes'){
$('input[id$="txtareaID"]').attr('disabled','disabled');
$('input[id$="txtareaID"]').prop('disabled',true); //Didn't worked either
}

Dynamically change Tweet Button "data-text" contents

This question comes very closely to what I'm after: Replace an Attribute in the Tweet Button with Jquery
However, the suggested solution works just once. That is, I cannot use it in my switch statement like this:
switch(element.id)
{
case "t1":
$(document).ready(function(){
$('a[data-text]').each(function(){
$(this).attr('data-text', Text_Variant_1);
});
$.getScript('http://platform.twitter.com/widgets.js');
});
break;
case "t2":
$(document).ready(function(){
$('a[data-text]').each(function(){
$(this).attr('data-text', Text_Variant_2);
});
$.getScript('http://platform.twitter.com/widgets.js');
});
...
}
What happens is that the data-text attribute is set according to whichever case happens first and doesn't change afterwards.
How can I change data-text attribute of a Tweet Button as many times as I need?
Update: here's the page I'm working on: http://zhilkin.com/socio/en/
The Traits table can be safely ignored. What I want to do with the Sociotypes table is that when you click on a type, the data-text of the Tweet Button below the description on the right should be changed accordingly.
Right now it works like this: if I hover on or click "Don Quixote", then data-text is set to "... Don Quixote ...", and it stays the same if I click "Dumas" later. And vice versa: if I hover on or click "Dumas", then data-text is set to "... Dumas ..." and doesn't change if I click "Don Quixote". (Other types are empty at the moment.)
So, the Tweet Button is only changed the first time I run the script, but I need it to be updated as many times as the type changes.

I struggled with this for a couple of hours this morning, but finally got it working! The problem is essentially that you can only include the twitter widgets.js script once in the page, and that script evaluates the data-text attribute on load. Therefore, in your example, you dynamically set the data-text attribute before loading the script, which will work as expected. However, you can then make no further updates as the script has already run.
I saw this article suggesting you can call twttr.widgets.load() again at runtime to re-evaluate and re-render the buttons, however that didn't work for me. This is because that function re-evaluates <a> tags, not <iframe> tags!
So the solution, as pointed out here, is to completely remove the rendered <iframe> from the DOM, then make a new <a> element with all the appropriate attributes before calling twttr.widgets.load() to finally re-evaluate it and turn it into an <iframe>.
Please see this fiddle for a working example!

You can also use Twitter's createShareButton API call:
function callAsRequired(){
var nodeID = 'YourTwitterNodeID'
//Remove existing share button, if it exists.
var myNode = document.getElementById(nodeID);
while (myNode.firstChild) {
myNode.removeChild(myNode.firstChild);
}
//Create button and customise
twttr.widgets.createShareButton(
'http://your.custom.url.here/',
document.getElementById(nodeID),
{
count: 'none',
text: 'Your custom tweet here'
});
}

since you are using each loop you can use if statements instead:
$(document).ready(function(){
$('a[data-text]').each(function(){
if (theCase == 1) {
$(this).attr('data-text', Text_Variant_1);
}
else if (theCase == 2) { ... }
})
});

If span display set to inline do this

I'm working on a .net website that validates an input and if it fails adds an inline style
"display:inline;"
Im trying to use jQuery to see this style and add a class to the respective input field.
if(!!$('span.errorp').length ){
alert('hi');
}
the above is what im currently using to ensure i can target the correct tag which works,
I guess i need something similar too...
if(!!$('span.errorp').display:inline ){
alert('hi');
}

Try the following
if ($('span.errorp').css('display') === 'inline') {
...
}

You can use something like:
$('span.errorp').css('display', 'inline');
It's not necessary to check for length. If there are no matches, nothing happens.

if($('span.errorp[style=display:inline]')) {
// do stuff
}

Using jquery to display value

I have a form with a select currently in use and an empty div (#price) below the form . I was wondering if anyone knew how (using jquery), to make it so that if I chose something in the select, to output it to the box. Or is the best solution to have the prices already loaded into the empty div, and just hide them using css?

$('#selectID').change(function() {
$('#divID').text($(this).find(':selected').text());
});
Or, if you want the value...
$('#selectID').change(function() {
$('#divID').text($(this).val());
});

You could do something like this:
$('#select').change(function() {
$('#price').text($(this).val());
});
Example

What about this:
$("#select-id").change(function() {
$("#price").text($("#select-id").val());
});