Develop Reference

Only show parent if child contains certain string

I have a group of divs that appear on multiple pages, that have this pattern:
<div class=“entry”>
<div id=“post”>
<div class=“text”>
<div class=“service”></div>
<div class=“timeline”>
<div class=“entry-title”>
#hashtagOne
</div>
</div>
</div>
</div>
</div>
<div class=“entry”>
<div id=“post”>
<div class=“text”>
<div class=“service”></div>
<div class=“timeline”>
<div class=“entry-title”>
#hashtagTwo
</div>
</div>
</div>
</div>
</div>
<div class=“entry”>
<div id=“post”>
<div class=“text”>
<div class=“service”></div>
<div class=“timeline”>
<div class=“entry-title”>
#hashtagThree
</div>
</div>
</div>
</div>
</div>
This group appears on multiple pages.
My ideal javascript/jquery solution is something like this:
display:none on all div class="entry"
if child div class="entry-title" contains #something, change parent div class="entry" to display:block
so that on Page One I can insert this code to only show #hashtagOne, on Page Two only #hashtagTwo, etc. etc.

Try something like this:
$('.entry-title').each(function(i,v){
if ($(this).text().trim().charAt(0) =="#") {
$(this).closest('.entry').show();
}
});
https://jsfiddle.net/0ybstx9o/

This simply works fine :
$(document).ready(function(){
$(".entry").each(function(){
if($(this).find(".entry-title:contains('#something')").length > 0){
$(this).css("display","block");
}
});
});

Its pretty simple, just use :contains() and .closest() together either on page load or whatever event you want this display:block behavior to run.
As you want to show based on differnt pages, I suggest to use page title and set it to title="Page One" and title="Page Two" etc and then compare it in document ready state and show accordingly the desired div
jQuery(document).ready(function(){
jQuery('div.entry').hide();
if(jQuery(document).find("title").text() == 'Page One')
{
jQuery( "div.entry-title:contains('#something')" ).closest('.entry').show();
}
else if(jQuery(document).find("title").text() == 'Page Two')
{
jQuery( "div.entry-title:contains('#something Else')" ).closest('.entry').show();
}
});

$(".entry").find(".entry-title").text(function(key, text) {
if (text.indexOf("#")>=0) {
$(this).parents(".entry").hide()
}
})
Here is the working Plunker

jquery clone a link (once per div)

I have a set of divs, and need to clone the link from the top and insert into the last div (mobile-link). It is either cloning the links from all of the divs, and then inserting all of them at once, or if I use :eq(0), it's putting the first link into all of the divs.
<div class="course">Accounting</div>
<div class="start-date">1-1-2017</div>
<div class="credits">4</div>
<div class="location">Online</div>
<div class="mobile-link"></div>
<div class="course">Business</div>
<div class="start-date">1-1-2017</div>
<div class="credits">3</div>
<div class="location">Online/Campus</div>
<div class="mobile-link"></div>
<script>
$(".course a:eq(0)").clone().appendTo(".mobile-link");
</script>
What do I need to change to make this work properly?

You need to process each anchor separately:
$(".course").each(function() {
var myLink = $(this).find('a').clone();
$(this).nextAll('.mobile-link').first().append(myLink);
});
Demo fiddle

Append method can take a function as argument, and here it is appending to the each .mobile-link first <a> from his previous .course div
$(".mobile-link").append(function(){
return $(this).prevAll('.course:first').find('a:first').clone();
});
Check the below snippet
$(".mobile-link").append(function(i) {
return $(this).prevAll('.course:first').find('a:first').clone();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="course">Accounting
</div>
<div class="start-date">1-1-2017</div>
<div class="credits">4</div>
<div class="location">Online</div>
<div class="mobile-link"></div>
<div class="course">Business
</div>
<div class="start-date">1-1-2017</div>
<div class="credits">3</div>
<div class="location">Online/Campus</div>
<div class="mobile-link"></div>

I beleive that you should use last (If I understood question correctly):
var lastDiv = $(".mobile-link").last();
$(".course a:eq(0)").clone().appendTo(lastDiv);
Here is jsfiddle: fiddle

Hide parent div if child div is missing

Is it possible at all to hide a parent div if there is a child div missing?
In the example below I would like to hide the parent div of "#live-sessions" if some of the divs are missing such as .views-content and .views-row.
This is what it looks like when the divs are there:
<div id="live-sessions">
<div class="container">
<div class="row">
<div class="col-sm-3">
<h3 class="session-title">Sessions Live Now</h3>
<div class="col-sm-9">
<div class-"view-display-id-live_sessions">
<div class="views-content">
<div class="views-row">
</div>
<div class="views-row">
</div>
</div>
</div>
</div>
</div>
</div>
</div>
This is what it looks like when the divs are missing:
<div id="live-sessions">
<div class="container">
<div class="row">
<div class="col-sm-3">
<h3 class="session-title">Sessions Live Now</h3>
<div class="col-sm-9">
<div class-"view-display-id-live_sessions">
</div>
</div>
</div>
</div>
</div>
I tried using the :empty selector with the parent method, but my child div contains some blank lines so it doesn't think it's empty. Also I would like to hide the parent of the parent of the empty div.
$(".view-display-id-live_sessions:empty").parent().hide();

You have a typo in your html:
class-"view-display-id-live_sessions"
should be
class="view-display-id-live_sessions"
you can try the following jQuery code:
if ($(".view-display-id-live_sessions").html().trim() == '') {
$(".view-display-id-live_sessions").parent().parent().hide();
}
jqVersion demo

Use jQuery has() in a negative if test - http://api.jquery.com/has/
if(!$('#parent').has('.child')){
$('#parent').hide();
}

There isn't a one-line-query for this. Following code would do the trick:
$('#live-sessions .row').each(function(idx, row) {
if ($(row).find('.views-content').length == 0) {
$(row).hide();
}
});

If you want to keep using jQuery, you could instead do:
if ( ! $(".view-display-id-live_sessions").children().length ) { /* your logic */ }
Note that there's a syntax error in your code:
<div class-"view-display-id-live_sessions">
Should be
<div class="view-display-id-live_sessions">

If you understand your question:
First you need to check the number of .views-row divs. If the length is zero hide the parent div.
Ex:
if ($('.views-row').length < 1)
$('#live-sessions').hide();
Good Luck.

You need to trim the blank spaces, correct a typo and test for the text within the div -
class="view-display-id-live_sessions" // note the equals sign after class
The code to do the hiding (EDIT re-read problem again):
var liveSessionsText = $.trim( $('.view-display-id-live_sessions').text() );
if(0 == liveSessionsText.length) {
$('.view-display-id-live_sessions').closest('.row').hide();
}
The div with class="row" is the parent of the parent of view-display-id-live_sessions.

Append a div to a new div

i am using IPB and i am going to put each category into a new tab the category div is something like this:
<div id='category_100'>
<div id='category_104'>
<div id='category_102'>
<div id='category_101'>
and my tabs content is like this:
<div class="content">
<div id="content-1" class="content-1">
</div>
</div>
and the categories divs is already showing but i want it to be moved to the content-1 div without duplicate so i want it to move from its div to this div with jjava script how?
<script>
document.getElementById('content-1').appendChild(
document.getElementById('category_100')
);
</script>
this worked for me but how can i add more than id to category_100
i want it to be like this in one script code so i would not repeart the scrip code four times:
<div class="content">
<div id="content-1" class="content-1">
<div id='category_100'>
<div id='category_104'>
<div id='category_102'>
<div id='category_101'>
</div>
</div>
using my two lines the suggested things here is not working!

Try this code :
$('div[id^="category_"]').appendTo('#content-1')
Have a look to this fiddle : http://jsfiddle.net/lulu3030/sjEPx/2/

"using my two lines the suggested things here is not working!"
You just get a single element with an ID and trying to append it...
Live Demo
If you want to append multiple elements, there are many ways...
Wrap those elements and then append...
<div id="categories">
<div id='category_100'></div>
<div id='category_104'></div>
<!-- etc. -->
</div>
document.getElementById('content-1').appendChild(document.getElementById('categories'));
or add same class to all elements that you want to append...
<div id='category_100' class="myClass"></div>
<div id='category_104' class="myClass"></div>
[].forEach.call(document.getElementsByClassName("myClass"), function (value, index, array) {
document.getElementById("content-1").appendChild(value);
});
or get elements with query selector that match some pattern...
[].forEach.call(document.querySelectorAll("div[id^='category_']"), function (value, index, array) {
document.getElementById("content-1").appendChild(value);
});
and etc.

Jquery div expands all divs on page

<script type="text/javascript">
jQuery(document).ready(function() {
jQuery(".content").hide();
jQuery(".link").click(function()
{
jQuery("div.content").slideToggle(500);
});;
});
</script>
How to expand only the div which is linked to the specific link?
Edit:
Its done like this
<div class="comment">
<div class="bar">
<a class="link">#</a>
</div>
</div>
<div class="content">
<div class="comment">
<div class="bar">
<a class="link">#</a>
</div>
</div>
</div>

EDIT 2:
You changed your HTML. Now do this:
jQuery(this).closest('div.comment').next('div.content').slideToggle(500);
But wait! Now you have 2 different div.link elements in different relation to .content elements. Is this your actual HTML markup?
You could also do this:
jQuery(this).closest('div.content').slideToggle(500);
Please provide your actual HTML.
EDIT:
Based on updated question, do this:
jQuery(this).parents('div.blaat1').eq(1).next().slideToggle(500);
How to expand only the div which is linked to the specific link?
How are they linked?
If the div is a descendant, do this:
jQuery(this).find('div.content').slideToggle(500);
If the div is a an ancestor, do this:
jQuery(this).closest('div.content').slideToggle(500);
If the div is the next sibling, do this:
jQuery(this).next().slideToggle(500);
If the div is the previous sibling, do this:
jQuery(this).prev().slideToggle(500);
Without seeing your HTML structure, we can only guess at the solution.

For this HTML:
<div class="blaat1">
<div class="blaat1">
<a class="link">#</a>
</div>
<div class="blaat2">
<a class="link">#</a>
</div
</div>
<div class="content">
<div class="otherdivs">
<div class="blaat1_div"><p>Hi – I'm blaat 1</p></div>
<div class="blaat2_div"><p>Hi – I'm blaat 2</p></div>
</div>
</div>
Use this JS:
<script type="text/javascript">
$(document).ready(function() {
$(".content").hide();
$(".link").click(function() {
var blaat = $(this).parent().attr("class");
$(blaat+"_div").slideToggle(500);
});;
});
</script>
I haven't tested that, but it should work.

Try this:
$(".link").click(function(){
$(this).parents('div.content').slideToggle(500);
});;