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jQuery in Wordpress - Hide parent div if it contains a specific other div

I'm trying to hide a slick slider section if it has no slides. I've tried tons of different options, like trying to use PHP and CSS, but I feel I'm closest to getting it to work with jQuery.
The HTML output structure is:
<div class="container-flex type-testimonials-container">
<div class="container">
<div class="container type-testimonials slick-initialized slick-slider">
<div class="slick-list draggable">
<div class="slick-track">
<div class="slick-slide">
SINGLE SLIDE CONTENT
</div>
<div class="slick-slide">
SINGLE SLIDE CONTENT
</div>
<div class="slick-slide">
SINGLE SLIDE CONTENT
</div>
</div>
</div>
</div>
</div>
</div>
So, I'm thinking I can use jQuery to hide the containing div (.type-testimonials-container) if the single slide div (.slick-slide) doesn't exists.
I have tried the following:
if(jQuery(".slick-slide").html().length)
{
jQuery(".type-testimonials-container").hide();
}
As well as lots of variations of that... I think it might be because the two divs aren't on the same level and one contains the other, but trying to find a parent/child way of doing is proving difficult... I'm not sure which way to go...
Any help would be massively appreciated!
EDIT*
I've also tried checking the parent and child relationship and trying to wait until the DOM has loaded, like this:
document.addEventListener("DOMContentLoaded", function(event) {
var parentDiv = document.getElementsByClassName("slick-track");
var childDiv = document.getElementsByClassName("slick-slide");
if (parentDiv.contains(childDiv))
{
alert("div DOES exist");
}
else{
alert("div DOES NOT exist");
}
});
But this just shows me the DOES NOT exist alert even though it does exist - Will this search the whole of the DOM for it? or do I need to provide the exact path of the div from body or something?

Why not just query for the length of the HTML collection of .slick-slide? JQ will still return an object if the target element doesn't exist, and the object will have a property length. Something like
if(jQuery(".slick-slide").length === 0) {
jQuery(".type-testimonials-container").hide();
}

I managed to do it this way:
jQuery(document).ready(function() {
if(jQuery('.slick-slide').length){
jQuery('.type-testimonials-container').show();
}
else
{
jQuery('.type-testimonials-container').hide();
}
});

How to slide down dynamic content using jQuery?

I have a comment system and I would like to implement the "Show Replies (2)" slide down effect.
This is an example of my setup.
<div class="comment">
<div class="main-comment">
Message.
Show Replies (1)
</div>
<div class="sub-comment">
Funny comment up there, mate.
</div>
</div>
But because both the main comment and its sub comments are dynamically generated using ajax, setting event handlers was a little tricky. This is how I did it:
$(".comment").delegate('.show-replies', 'click', function(event) {
$(this).parent().next(".sub-comment").slideDown();
});
I've tried to make the setup as simple and close to the real thing as possible.
What am I doing wrong and how do I solve it?

<div class="comment">
<div class="main-comment">
Message.
Show Replies (1)
</div>
<div class="sub-comment" style="display: none">
Funny comment up there, mate.
</div>
</div>
<script>
$(document).ready(function() {
$('.show-replies').on('click', function() {
$('.sub-comment').slideToggle();
});
});
</script>

In order to bind to NEW dynamic content you need to tell jquery where it is going to be.. Also make sure to use the latest jQuery, delegate is old.
<div class="comments">
<div class="main-comment">
Message.Show Replies (1)
</div>
<div class="sub-comment" style="display: none">
Funny comment up there, mate.
</div>
</div>
<script>
$(document).ready(function() {
$('.show-replies').on('click','.comments', function() {
$('.sub-comment').slideToggle();
});
});
</script>
Notice the .on(eventType, selector, function) signature.
This will work for dynamic content, anything loaded INTO the div class 'comments' - jQuery will always travesre that container from fresh, instead of caching it.
Also- dont just do it on the entire page,because it will cause slow response, since, every click, it will try and bind to the selector.

Replacing
$(this).parent().next(".sub-comment").slideDown();
with
$(this).parent().parent().next(".sub-comment").slideDown();
Fixed the problem.

Polymer 'detail.item' won't return the correct object

I can't for the love of god get selection (or animated-pages for that matter) to work. I tried following the tutorials, but they don't mention ANYWHERE how to actually perform the transition from one page to another (or there is something I'm totally not understanding), my guess is that I should only need to set the selected value of the core-animated-pages but that doesn't work either.
First of all, the detail.item object doesn't seem to contain the correct stuff. I'm probably doing something trivial wrong. When trying to access "detail.item.selectedIndex" from the on-core-select event I only get undefined. If I access the property by id using: this.$.selector.selectedIndex it will work.
Also doing the following seems to do nothing:
var pages = this.$.pages;
pages.selected = selectedIndex;
See the code below to understand what I'm trying to do:
<!-- 2. Load the component using an HTML Import -->
... Imports here ...
<polymer-element name='index-app'>
<template>
<core-scaffold>
<core-header-panel navigation flex mode="seamed">
<core-toolbar>Application</core-toolbar>
<core-menu theme="core-light-theme" >
<core-selector on-core-select="{{selectAction}}" id="selector">
<core-item icon="settings" label="item1"></core-item>
<core-item icon="settings" label="item2"></core-item>
</core-selector>
</core-menu>
</core-header-panel>
<div tool>{{item.label}}</div>
<div class="content">
<core-animated-pages transitions="cross-fade-all" id="pages" selected="{{selected}}">
<section id="page1" hidden?="{{selected!=0}}">
<div cross-fade>Home page contents</div>
</section>
<section id="page2" hidden?="{{selected!=1}}">
<div cross-fade>Gallery contents</div>
</section>
</core-animated-pages>
</div>
</core-scaffold>
</template>
<script>
Polymer({
ready: function(){
this.$.selector.selected = 0;
},
selectAction: function(e, detail){
var selectedIndex = this.$.selector.selectedIndex;
var pages = this.$.pages;
pages.selected = selectedIndex;
}
});
</script>
</polymer-element>

Try using selected={{selection}} for both your core selector and your core animated pages. If I remember correctly, the selected published property binds to the index of the item for both of these elements. In your core selector it will bind to the index of the item that has been selected, and in the core animated pages will pull the bound value and use it as the index to grab the page and display that page.
In other words, you don't need an event handler or manual manipulation of the hidden element. The data binding system handles this all for you.

Is it possible to access a function in a directive from a view?

I'm fairly new to AngularJS and trying to learn by doing.
There is a function in a directive I'm looking to access from the view. What I have in my HTML file is
<div collapse class="collapsed" ng-click="toggle()" ></div>
What's going on there is the toggle() function should be called on click and change the class to expanded, effectively changing the background image described in the CSS. toggle() is inside the collapse directive.
It doesn't seem to be accessing it though and I'm not sure why. Is there another way to do this or actually access said directive from the view? Could you explain why it's not accessing it?

Could this question possibly help? 15672709, it leads to this fiddle and goes beyond in case you nest your directives like below:
<div ng-controller="MyCtrl">
<div screen>
<div component>
<div widget>
<button ng-click="widgetIt()">Woo Hoo</button>
</div>
</div>
</div>
</div>

Conditional logic in AngularJS template

I have an angular template which looks like this...
<div ng-repeat="message in data.messages" ng-class="message.type">
<div class="info">
<div class="type"></div>
<div class="from">From Avatar</div>
<div class="createdBy">Created By Avatar</div>
<div class="arrowTo">
<div class="arrow"></div>
<div class="to">To Avatar</div>
</div>
<div class="date">
<div class="day">25</div>
<div class="month">Dec</div>
</div>
</div>
<div class="main">
<div class="content">
<div class="heading2">{{message.title}}</div>
<div ng-bind-html="message.content"></div>
</div>
</div>
<br />
<hr />
<br />
</div>
I have set up a JSfiddle to show the data being bound.
What I need to do is make the "from", "to" and "arrowTo" divs show conditionally, depending on the content of the data.
The log is is this...
If there is a "from" object in the data then show the "from" div and bind the data but don't show the "createdBy" div .
If there is no "from" object but there is a "createdBy" object then show the "createdBy" div and bind the data.
If there is a "to" object in the data then show the "arrowTo" div and bind it's data.
Or in plain English, if there is a from address, show it, otherwise show who created the record instead and if there is a to address then show that too.
I have looked into using ng-switch but I think I'd have to add extra markup which would leave an empty div if there was no data. Plus I'd need to nest switch directives and I'm not sure if that would work.
Any ideas?
UPDATE:
If I were to write my own directive (If I knew how!) then here is some pseudo code to show how I would want to use it...
<div ng-if="showFrom()">
From Template Goes Here
</div>
<div ng-if="showCreatedBy()">
CreatedBy Template Goes Here
</div>
<div ng-if="showTo()">
To Template Goes Here
</div>
Each of these would disappear if the function/expression evaluated to false.

Angular 1.1.5 introduced the ng-if directive. That's the best solution for this particular problem. If you are using an older version of Angular, consider using angular-ui's ui-if directive.
If you arrived here looking for answers to the general question of "conditional logic in templates" also consider:
1.1.5 also introduced a ternary operator
ng-switch can be used to conditionally add/remove elements from the DOM
see also How do I conditionally apply CSS styles in AngularJS?
Original answer:
Here is a not-so-great "ng-if" directive:
myApp.directive('ngIf', function() {
return {
link: function(scope, element, attrs) {
if(scope.$eval(attrs.ngIf)) {
// remove '<div ng-if...></div>'
element.replaceWith(element.children())
} else {
element.replaceWith(' ')
}
}
}
});
that allows for this HTML syntax:
<div ng-repeat="message in data.messages" ng-class="message.type">
<hr>
<div ng-if="showFrom(message)">
<div>From: {{message.from.name}}</div>
</div>
<div ng-if="showCreatedBy(message)">
<div>Created by: {{message.createdBy.name}}</div>
</div>
<div ng-if="showTo(message)">
<div>To: {{message.to.name}}</div>
</div>
</div>
Fiddle.
replaceWith() is used to remove unneeded content from the DOM.
Also, as I mentioned on Google+, ng-style can probably be used to conditionally load background images, should you want to use ng-show instead of a custom directive. (For the benefit of other readers, Jon stated on Google+: "both methods use ng-show which I'm trying to avoid because it uses display:none and leaves extra markup in the DOM. This is a particular problem in this scenario because the hidden element will have a background image which will still be loaded in most browsers."). See also How do I conditionally apply CSS styles in AngularJS?
The angular-ui ui-if directive watches for changes to the if condition/expression. Mine doesn't. So, while my simple implementation will update the view correctly if the model changes such that it only affects the template output, it won't update the view correctly if the condition/expression answer changes.
E.g., if the value of a from.name changes in the model, the view will update. But if you delete $scope.data.messages[0].from, the from name will be removed from the view, but the template will not be removed from the view because the if-condition/expression is not being watched.

You could use the ngSwitch directive:
<div ng-switch on="selection" >
<div ng-switch-when="settings">Settings Div</div>
<span ng-switch-when="home">Home Span</span>
<span ng-switch-default>default</span>
</div>
If you don't want the DOM to be loaded with empty divs, you need to create your custom directive using $http to load the (sub)templates and $compile to inject it in the DOM when a certain condition has reached.
This is just an (untested) example. It can and should be optimized:
HTML:
<conditional-template ng-model="element" template-url1="path/to/partial1" template-url2="path/to/partial2"></div>
Directive:
app.directive('conditionalTemplate', function($http, $compile) {
return {
restrict: 'E',
require: '^ngModel',
link: function(sope, element, attrs, ctrl) {
// get template with $http
// check model via ctrl.$viewValue
// compile with $compile
// replace element with element.replaceWith()
}
};
});

You can use ng-show on every div element in the loop. Is this what you've wanted: http://jsfiddle.net/pGwRu/2/ ?
<div class="from" ng-show="message.from">From: {{message.from.name}}</div>