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JQuery not updating CSS elements after PHP include

I am loading PHP files with JQuery/Ajax.
This is the index.php file where the webpages are called
<div class = "view-screen">
<?php include('home.php'); ?>
</div>
Depending on which nav link is clicked, that page will display without refreshing.
$(document).ready(function() {
// ...
$navLinks.click( function() {
var $this = $(this)
target = $this.data('target')
toggleMenu()
$viewScreen.load(target + ".php")
$this.data('clicked', true)
if ($this.data('clicked') && target === "about") {
activateAbout()
}
return false
})
function activateAbout() {
console.log('activated')
}
}
The console log works, and displays 'activated'. The pages do load.
All of my scripts compile and link correctly to each other.
However, when I include code that updates the target page CSS in the activateAbout() function, it doesn't work. For example:
$('body').css("background-color", "white")
in activateAbout() works, but calling/updating CSS elements in the chosen .php file doesn't, such as
$('.about p').css("color", "white")
// OR
$('.about').toggleClass('activate')
I have a feeling this has something to do with the order in which these files are loaded, but I'm not sure! Thanks for the help in advance

This is common phenomenon. The reason you are not able to apply the css is because, your content is loading after, you call activateAbout(). I would recommend to call activateAbout() once the $viewScreen.load(target + ".php") loads the data successfully. jQuery.load() supports callback too. Refer to the example usage at https://www.w3schools.com/jquery/jquery_ajax_load.asp. So, it should look like
$(document).ready(function() {
$navLinks.click( function(){
var $this = $(this);
target = $this.data('target');
toggleMenu();
$viewScreen.load(target + ".php", function() {
$this.data('clicked', true);
if ($this.data('clicked') && target === "about") {
activateAbout();
}
});
return false;
});
});
function activateAbout() {
console.log('activated')
}
Also there is a trick using setTimeout which you can execute after certain time, when the view is expected to be loaded like below
if ($this.data('clicked') && target === "about") {
//The timeout period you can change accordingly
setTimeout(activateAbout, 300);
}
The recommended way is first type solution. Hope this helps you!!

Show a sub-menu using JQuery

I need some help making a sub-menu appear within 2s after the page loads instead of when the user clicks on it. I'm using JQuery. That file is the core of the website. I need it to stay opened.
Here's the code I have at the moment, I tried to change that on.Click event but it didn't work.
The handleSidenarAndContentHeight(); function resizes the menu items after the sub-menu appears.
jQuery('.page-sidebar li > a').on('click', function (e) {
if ($(this).next().hasClass('sub-menu') === false) {
return;
}
var parent = $(this).parent().parent();
parent.children('li.open').children('a').children('.arrow').removeClass('open');
parent.children('li.open').children('a').children('.arrow').removeClass('active');
parent.children('li.open').children('.sub-menu').slideUp(350);
parent.children('li').removeClass('open');
parent.children('li').removeClass('active');
var sub = jQuery(this).next();
if (sub.is(":visible")) {
jQuery('.arrow', jQuery(this)).removeClass("open");
jQuery(this).parent().removeClass("active");
sub.slideUp(350, function () {
handleSidenarAndContentHeight();
});
} else {
jQuery('.arrow', jQuery(this)).addClass("open");
jQuery(this).parent().addClass("open");
sub.slideDown(350, function () {
handleSidenarAndContentHeight();
});
}
e.preventDefault();
});

Working with a 2 second timeout should do the trick!
jQuery(document).ready(function(){
// Open Parent here
setTimeout(function(){
// Open Child here
}, 2000)
});

There is a simple javascript function you can use, the setTimeout function.
The code follows like this :
setTimeout(function() {yourFunctyion();}. delayTimeInMiliseconds);
This will call your function after the number of second(in ms).
There is also a plugin I've used. It has oneTime and everyTime methods.
jQuery timers plugin

Using .style.opacity = using javascript is not working for some reason

I'm new to javascript and jquery and I am trying to make a video's opacity change when I mouseover a li item. I know 'onmouseover' works because I have tested using the same jquery I use to scroll to the top of the page onclick.
The problem seems to be the syntax to check and update the style of the video div is not working. I adapted the code from a lesson on codeacademy and don't see why it work:
window.onload = function () {
// Get the array of the li elements
var vidlink = document.getElementsByClassName('video');
// Get the iframe
var framecss = document.getElementsByClassName('videoplayer1');
// Loop through LI ELEMENTS
for (var i = 0; i < vidlink.length; i++) {
// mouseover function:
vidlink[i].onmouseover = function () {
//this doesn't work:
if (framecss.style.opacity === "0.1") {
framecss.style.opacity = "0.5";
}
};
//onclick function to scroll to the top when clicked:
vidlink[i].onclick = function () {
$("html, body").animate({
scrollTop: 0
}, 600);
};
}
};
Here is a jsfiddle you can see the html and css:
http://jsfiddle.net/m00sh00/CsyJY/11/
It seems like such a simple problem so I'm sorry if I'm missing something obvious.
Any help is much appreciated

Try this:
vidlink[i].onmouseover = function () {
if (framecss[0].style.opacity === "0.1") {
framecss[0].style.opacity = "0.5";
}
};
Or alternatively:
var framecss = document.getElementsByClassName('videoplayer1')[0];
Or, better, give the iframe an id and use document.getElementById().
The getElementsByClassName() function returns a list, not a single element. The list doesn't have a style property. In your case you know the list should have one item in it, which you access via the [0] index.
Or, given that you are using jQuery, you could rewrite it something like this:
$(document).ready(function(){
// Get the iframe
var $framecss = $('.videoplayer1');
$('.video').on({
mouseover: function () {
if ($framecss.css('opacity') < 0.15) {
$framecss.css('opacity', 0.5);
}
},
click: function () {
$("html, body").animate({
scrollTop: 0
}, 600);
}
});
});
Note that I'm testing if the opacity is less than 0.15 because when I tried it out in your fiddle it was returned as 0.10000000149011612 rather than 0.1.
Also, note that the code in your fiddle didn't run, because by default jsfiddle puts your JS in an onload handler (this can be changed from the drop-down on the left) and you then wrapped your code in window.onload = as well. And you hadn't selected jQuery from the other drop-down so .animate() wouldn't work.
Here's an updated fiddle: http://jsfiddle.net/CsyJY/23/

JQuery Hover Function Timeout

I've seen other similar questions to this on SO but the answers weren't quite what I'm looking for. My problem with the code below is about the variable hide.
In it's current form hide won't be visible to the first hover function, but I don't want to declare it at a higher scope because it has no use there. Plus declaring it at a higher scope would require making a different variable for every li.
What's the solution for keeping this variable containing a timeout between these two functions?
$('li').hover(function() {
clearTimeout(hide);
$('.menu', this).show();
}, function() {
var menu = $('.menu', this);
var hide = setTimeout(function() {
menu.hide();
}, 500);
});

You can store the value with .data()
$('li').hover(function() {
clearTimeout($(this).data('hide'));
$('.menu', this).show();
}, function() {
var menu = $('.menu', this);
$(this).data('hide', setTimeout(function() {
menu.hide();
}, 500));
});

Jquery functions working momentarily, and then not at all?

I had applied this slide mechanism to a page, and it worked fine for a while. I can't remember changing anything at all, but now it won't function properly.
Here is the code:
$(document).ready(function () {
var hash = window.location.hash.substr(1);
var href = $('#nav li a').each(function () {
var href = $(this).attr('href');
if (hash == href.substr(0, href.length)) {
var toLoad = hash + '.html #content';
$('#content').load(toLoad)
}
});
$('#nav li a').click(function () {
$("#story_pane").animate({
marginLeft: 360
}, 250);
$("#main_content").animate({
marginLeft: -600,
opacity: 0.3
}, 250);
$("#main_content").css();
});
alert("test");
var toLoad = $(this).attr('href') + ' #content';
$('#content').hide(1, loadContent);
$('#load').remove();
$('#story_pane').css("display", "block");
$('#story_pane').append('<span id="load"></span>');
$('#load').fadeIn(1);
window.location.hash = $(this).attr('href').substr(0, $(this).attr('href').length - 5);
function loadContent() {
$('#content').load(toLoad, '', showNewContent())
}
function showNewContent() {
$('#content').show(1, hideLoader());
}
function hideLoader() {
$('#load').hide();
}
return false;
});
Only the "test" alert executes properly, I had been looking for any brackets i forgot to close, or other syntax issues but i'm in a bit of a dead end. I do have the files backedup, but that's a last resort option, in case I can't fix this.
edit- works now, I deleted $("#main_content").css(); and added a click function which fixed it

Change this:
function loadContent() {
$('#content').load(toLoad,'',showNewContent) // remove the "()" here
}
The way you had that call to ".load()" coded, you were calling "showNewContent" at the time the load began, not when it finished. Same goes for the "showNewContent" function itself:
function showNewContent() {
$('#content').show(1,hideLoader); // again, remove "()" from "hideLoader"
}
It's important to keep clear the distinction between referring to a function by name when passing it as a parameter for some API that needs a callback, and the process of actually calling the function. In these cases, you need a reference to a function. (Yes, a function call can return a reference to a function, but that's not what's happening here.)
edit — Another significant problem you're going to have here is that the initial call to ".load()" to fetch the currently-relevant page based on the state of the nav will almost certainly not complete before the rest of that code has run. If there are any dependencies for the initialization on content loaded by that initial call to "load()", then that won't be in the DOM yet. You could fix this by stuffing all the code in the rest of the "ready" handler into the completion handler for that initial ".load()".
edit again — OK another problem is this line of code, right after the "alert()":
var toLoad = $(this).attr('href') + ' #content';
What is it that you expect this to be at this point? I think that jQuery will set this to refer to the "document" object, but you won't be able to get any "href" attribute from it like that. Maybe you want "window.location.href" there? I'm not sure what you're trying to accomplish, exactly.

This is what live and delegate are for.